From patchwork Thu Mar 20 11:48:22 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kemeng Shi X-Patchwork-Id: 14023364 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3AE5FC35FFC for ; Thu, 20 Mar 2025 02:53:07 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B00FA28001C; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 92075280018; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 42306280016; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 97EE7280013 for ; Wed, 19 Mar 2025 22:52:58 -0400 (EDT) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 6E9E7160A11 for ; Thu, 20 Mar 2025 02:52:58 +0000 (UTC) X-FDA: 83240407236.23.EA54517 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by imf14.hostedemail.com (Postfix) with ESMTP id BC80F100005 for ; Thu, 20 Mar 2025 02:52:54 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf14.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.51 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1742439176; a=rsa-sha256; cv=none; b=eFBCQUrA8f6arLxPmsHqDmvDDTnC0xyvAmc/7i+IpkKaoM5ibjoF2j9gB+dLFktXlMOAIe AcyQb9Dfu1LQ52zZHk7SVuh5j8r1jI75RWPZj3vS0oI2+SvzapAYgW/tgSp3fda+GTEcxG gFClJhtsexyG0hz/zvQgNYo3LJM0DPI= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf14.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.51 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1742439176; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=y3K71R1y9DvNQDZ49hR12YZuj91hQ39OgzmyWifmOsY=; b=V5qWHJQMPs9IbW/nlysxxxqE+k6Bov1ZmRyy+wq+79tRiERIlpzSFnksd21ieCfNDfCs1/ cGs7EbuWh/xgYzEoqIXGTRzufPywGkHCmSsf5bCQRt3qBk854VFr2FPjz96Yabhb/Suec1 1mFDL3T3mIhuiTwp3sKT2hNfCWxVK0Q= Received: from mail.maildlp.com (unknown [172.19.163.235]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4ZJ99D0Pg6z4f3jt8 for ; Thu, 20 Mar 2025 10:52:32 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.252]) by mail.maildlp.com (Postfix) with ESMTP id 5A41A1A06DC for ; Thu, 20 Mar 2025 10:52:49 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.101.6]) by APP3 (Coremail) with SMTP id _Ch0CgAHW8X_gttnYGGmGw--.42197S3; Thu, 20 Mar 2025 10:52:49 +0800 (CST) From: Kemeng Shi To: akpm@linux-foundation.org Cc: kasong@tencent.com, tim.c.chen@linux.intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 1/8] mm: swap: rename __swap_[entry/entries]_free[_locked] to swap_[entry/entries]_put[_locked] Date: Thu, 20 Mar 2025 19:48:22 +0800 Message-Id: <20250320114829.25751-2-shikemeng@huaweicloud.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20250320114829.25751-1-shikemeng@huaweicloud.com> References: <20250320114829.25751-1-shikemeng@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: _Ch0CgAHW8X_gttnYGGmGw--.42197S3 X-Coremail-Antispam: 1UD129KBjvJXoWxZrWUKFW5Zw1DuF4rGF47CFg_yoWrKr45pF 9Igrn8KFs7Jr1xGws7Xw48Zr4Fvw4xW3W8tFy7Gw12vasxJryFqFyDC3y7KFyUCr95CF90 ya1Utry7GF4jqr7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPFb4IE77IF4wAFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M280x2IEY4vEnII2IxkI6r1a6r45M2 8IrcIa0xkI8VA2jI8067AKxVWUGwA2048vs2IY020Ec7CjxVAFwI0_Jrv_JF4l8cAvFVAK 0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVW7JVWDJwA2z4 x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l 84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I 8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AK xVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxVAaw2AFwI 0_JF0_Jw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG 67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r126r1DMI IYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E 14v26r1j6r4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJV W8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxUswZ2 DUUUU X-CM-SenderInfo: 5vklyvpphqwq5kxd4v5lfo033gof0z/ X-Stat-Signature: yomcit3q9hzp5endryqdne5n39dpuwes X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: BC80F100005 X-Rspam-User: X-HE-Tag: 1742439174-603384 X-HE-Meta: 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 9vnpF5Eq IPKCGZkJpx5FJ2JeIPHFVh8WdkHCZiKYZypCXmlXLQO0XF1HM3Frk/HncnU23o+8MNnykI2pOyU5EoY5ZuMCoGCKGkwHtMWhE+68ZxACiqp2gLNg4krdTiRFNbJf25U2jRuvRq5dGoeyLw/udl0yogBzPQxZzSvpOWnNaeL1Mxpjn+MIWP6hkg/zisWCpUdrOoJ8WkZ9vyJfYdaJx/s4oTMgMW5Ftjp37gv67AKP5RqRV69E= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: In __swap_entry_free[_locked] and __swap_entries_free, we decrease count first and only free swap entry if count drops to zero. This behavior is more akin to a put() operation rather than a free() operation. Therefore, rename these functions with "put" instead of "free". Additionally, add "_nr" suffix to swap_entries_put to indicate the input range may span swap clusters. Signed-off-by: Kemeng Shi Reviewed-by: Tim Chen --- mm/swapfile.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index 628f67974a7c..5a775456e26c 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1347,9 +1347,9 @@ static struct swap_info_struct *_swap_info_get(swp_entry_t entry) return NULL; } -static unsigned char __swap_entry_free_locked(struct swap_info_struct *si, - unsigned long offset, - unsigned char usage) +static unsigned char swap_entry_put_locked(struct swap_info_struct *si, + unsigned long offset, + unsigned char usage) { unsigned char count; unsigned char has_cache; @@ -1453,15 +1453,15 @@ struct swap_info_struct *get_swap_device(swp_entry_t entry) return NULL; } -static unsigned char __swap_entry_free(struct swap_info_struct *si, - swp_entry_t entry) +static unsigned char swap_entry_put(struct swap_info_struct *si, + swp_entry_t entry) { struct swap_cluster_info *ci; unsigned long offset = swp_offset(entry); unsigned char usage; ci = lock_cluster(si, offset); - usage = __swap_entry_free_locked(si, offset, 1); + usage = swap_entry_put_locked(si, offset, 1); if (!usage) swap_entry_range_free(si, ci, swp_entry(si->type, offset), 1); unlock_cluster(ci); @@ -1469,8 +1469,8 @@ static unsigned char __swap_entry_free(struct swap_info_struct *si, return usage; } -static bool __swap_entries_free(struct swap_info_struct *si, - swp_entry_t entry, int nr) +static bool swap_entries_put_nr(struct swap_info_struct *si, + swp_entry_t entry, int nr) { unsigned long offset = swp_offset(entry); unsigned int type = swp_type(entry); @@ -1501,7 +1501,7 @@ static bool __swap_entries_free(struct swap_info_struct *si, fallback: for (i = 0; i < nr; i++) { if (data_race(si->swap_map[offset + i])) { - count = __swap_entry_free(si, swp_entry(type, offset + i)); + count = swap_entry_put(si, swp_entry(type, offset + i)); if (count == SWAP_HAS_CACHE) has_cache = true; } else { @@ -1552,7 +1552,7 @@ static void cluster_swap_free_nr(struct swap_info_struct *si, ci = lock_cluster(si, offset); do { - if (!__swap_entry_free_locked(si, offset, usage)) + if (!swap_entry_put_locked(si, offset, usage)) swap_entry_range_free(si, ci, swp_entry(si->type, offset), 1); } while (++offset < end); unlock_cluster(ci); @@ -1599,7 +1599,7 @@ void put_swap_folio(struct folio *folio, swp_entry_t entry) swap_entry_range_free(si, ci, entry, size); else { for (int i = 0; i < size; i++, entry.val++) { - if (!__swap_entry_free_locked(si, offset + i, SWAP_HAS_CACHE)) + if (!swap_entry_put_locked(si, offset + i, SWAP_HAS_CACHE)) swap_entry_range_free(si, ci, entry, 1); } } @@ -1798,7 +1798,7 @@ void free_swap_and_cache_nr(swp_entry_t entry, int nr) /* * First free all entries in the range. */ - any_only_cache = __swap_entries_free(si, entry, nr); + any_only_cache = swap_entries_put_nr(si, entry, nr); /* * Short-circuit the below loop if none of the entries had their @@ -1811,7 +1811,7 @@ void free_swap_and_cache_nr(swp_entry_t entry, int nr) * Now go back over the range trying to reclaim the swap cache. This is * more efficient for large folios because we will only try to reclaim * the swap once per folio in the common case. If we do - * __swap_entry_free() and __try_to_reclaim_swap() in the same loop, the + * swap_entry_put() and __try_to_reclaim_swap() in the same loop, the * latter will get a reference and lock the folio for every individual * page but will only succeed once the swap slot for every subpage is * zero. @@ -3758,7 +3758,7 @@ int add_swap_count_continuation(swp_entry_t entry, gfp_t gfp_mask) * into, carry if so, or else fail until a new continuation page is allocated; * when the original swap_map count is decremented from 0 with continuation, * borrow from the continuation and report whether it still holds more. - * Called while __swap_duplicate() or caller of __swap_entry_free_locked() + * Called while __swap_duplicate() or caller of swap_entry_put_locked() * holds cluster lock. */ static bool swap_count_continued(struct swap_info_struct *si, From patchwork Thu Mar 20 11:48:23 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kemeng Shi X-Patchwork-Id: 14023365 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 71004C36002 for ; Thu, 20 Mar 2025 02:53:09 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id DF53A280018; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id AFA0F280017; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6DFF728001B; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id A372D280017 for ; Wed, 19 Mar 2025 22:52:58 -0400 (EDT) Received: from smtpin18.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 745961A0A89 for ; Thu, 20 Mar 2025 02:52:58 +0000 (UTC) X-FDA: 83240407236.18.2AB2392 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by imf20.hostedemail.com (Postfix) with ESMTP id 7F8B01C0004 for ; Thu, 20 Mar 2025 02:52:54 +0000 (UTC) Authentication-Results: imf20.hostedemail.com; dkim=none; spf=pass (imf20.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.51 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1742439176; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nM4uR4rFJEQC1uocg9DTkYXzS83ZQGCogr8+3sWDvd0=; b=6G43onBpOxWNBEfeFhivFrAPDf+Y2FB2xXWDgb8U64RLfdRvqawBqyNygy6NBGzUY1Dy+o NHSgNXA3JsOdLO25b5AIGyjAjGn7jZaggqJMlveYZhQDtypip7WKqdYTqsvm0jIInCOOvG HX/Q6AxtKm4cskfTUNxgmdMq5YfSBVI= ARC-Authentication-Results: i=1; imf20.hostedemail.com; dkim=none; spf=pass (imf20.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.51 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1742439176; a=rsa-sha256; cv=none; b=hPALDv5lqPqICIutx6hfUt+QKUrT7PSBQWc412H//RMjaeCb0iZdDrf1YvPe5/WhcEJsdX PVoTlcYTFsJ57oFg9jVVZga1GzVKeiclPGHz6WkPX8TbpcP7+K+mpiQhZd7WbfSqOThSv1 UO5d1Wl1bdFuWRUHoCNRvaufcITjmv8= Received: from mail.maildlp.com (unknown [172.19.163.216]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4ZJ99D2HqGz4f3jtP for ; Thu, 20 Mar 2025 10:52:32 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.252]) by mail.maildlp.com (Postfix) with ESMTP id 9E49F1A0A22 for ; Thu, 20 Mar 2025 10:52:49 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.101.6]) by APP3 (Coremail) with SMTP id _Ch0CgAHW8X_gttnYGGmGw--.42197S4; Thu, 20 Mar 2025 10:52:49 +0800 (CST) From: Kemeng Shi To: akpm@linux-foundation.org Cc: kasong@tencent.com, tim.c.chen@linux.intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 2/8] mm: swap: enable swap_entry_range_free() to drop any kind of last ref Date: Thu, 20 Mar 2025 19:48:23 +0800 Message-Id: <20250320114829.25751-3-shikemeng@huaweicloud.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20250320114829.25751-1-shikemeng@huaweicloud.com> References: <20250320114829.25751-1-shikemeng@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: _Ch0CgAHW8X_gttnYGGmGw--.42197S4 X-Coremail-Antispam: 1UD129KBjvJXoWxWr1ktF18tF48GF4ruryDJrb_yoWrAFy7pF 9Igrn8Kr4xJF13K3y3Jw4Yyw4Sv3yxWw18ZF9rGw1Sv3ZxJry0qFyDA3yYkFyUA34kuF90 ka1qqr17GF4jyFUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPFb4IE77IF4wAFF20E14v26ryj6rWUM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M280x2IEY4vEnII2IxkI6r1a6r45M2 8IrcIa0xkI8VA2jI8067AKxVWUXwA2048vs2IY020Ec7CjxVAFwI0_JFI_Gr1l8cAvFVAK 0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVW7JVWDJwA2z4 x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l 84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I 8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AK xVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxVAaw2AFwI 0_JF0_Jw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG 67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r126r1DMI IYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E 14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJV W8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxUVveH DUUUU X-CM-SenderInfo: 5vklyvpphqwq5kxd4v5lfo033gof0z/ X-Stat-Signature: wze7qdwjtarfyipja4du3mi9reh77591 X-Rspamd-Queue-Id: 7F8B01C0004 X-Rspam-User: X-Rspamd-Server: rspam09 X-HE-Tag: 1742439174-104432 X-HE-Meta: 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 0weCMqvI EgWrMRm57pHsDOjbMfezJ4x8tfcf7EPLR3A7ucsBppvE4LIZLscZF75P4IhdupD/tJG4PbvQOPlGbH+GS2GhaeU5ab+D6pXT+KxPwWZWjr0xX+3smxDtLrChx9c7gUhuEYxPZO0nSFUFtrRJX4Ha+sO5KLh0nXCtbYRJiaeHvo5shOZYu52BA9z461aSHhKZYX+tD2nb7nTGBv6+GB+9Cd+FStvgIvdiu0UN4cpKkW4D2Ji8xXNcjh1DQe9Z78LNW24n7vcx5/tRCI8k= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The original VM_BUG_ON only allows swap_entry_range_free() to drop last SWAP_HAS_CACHE ref. By allowing other kind of last ref in VM_BUG_ON, swap_entry_range_free() could be a more general-purpose function able to handle all kind of last ref. Following thi change, also rename swap_entry_range_free() to swap_entries_free() and update it's comment accordingly. This is a preparation to use swap_entries_free() to drop more kind of last ref other than SWAP_HAS_CACHE. Signed-off-by: Kemeng Shi Reviewed-by: Tim Chen --- mm/swapfile.c | 34 ++++++++++++++++++++-------------- 1 file changed, 20 insertions(+), 14 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index 5a775456e26c..76720ca76aae 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -52,9 +52,9 @@ static bool swap_count_continued(struct swap_info_struct *, pgoff_t, unsigned char); static void free_swap_count_continuations(struct swap_info_struct *); -static void swap_entry_range_free(struct swap_info_struct *si, - struct swap_cluster_info *ci, - swp_entry_t entry, unsigned int nr_pages); +static void swap_entries_free(struct swap_info_struct *si, + struct swap_cluster_info *ci, + swp_entry_t entry, unsigned int nr_pages); static void swap_range_alloc(struct swap_info_struct *si, unsigned int nr_entries); static bool folio_swapcache_freeable(struct folio *folio); @@ -1463,7 +1463,7 @@ static unsigned char swap_entry_put(struct swap_info_struct *si, ci = lock_cluster(si, offset); usage = swap_entry_put_locked(si, offset, 1); if (!usage) - swap_entry_range_free(si, ci, swp_entry(si->type, offset), 1); + swap_entries_free(si, ci, swp_entry(si->type, offset), 1); unlock_cluster(ci); return usage; @@ -1493,7 +1493,7 @@ static bool swap_entries_put_nr(struct swap_info_struct *si, for (i = 0; i < nr; i++) WRITE_ONCE(si->swap_map[offset + i], SWAP_HAS_CACHE); if (!has_cache) - swap_entry_range_free(si, ci, entry, nr); + swap_entries_free(si, ci, entry, nr); unlock_cluster(ci); return has_cache; @@ -1512,12 +1512,18 @@ static bool swap_entries_put_nr(struct swap_info_struct *si, } /* - * Drop the last HAS_CACHE flag of swap entries, caller have to - * ensure all entries belong to the same cgroup. + * Drop the last ref(1, SWAP_HAS_CACHE or SWAP_MAP_SHMEM) of swap entries, + * caller have to ensure all entries belong to the same cgroup and cluster. */ -static void swap_entry_range_free(struct swap_info_struct *si, - struct swap_cluster_info *ci, - swp_entry_t entry, unsigned int nr_pages) +static inline bool swap_is_last_ref(unsigned char count) +{ + return (count == SWAP_HAS_CACHE) || (count == 1) || + (count == SWAP_MAP_SHMEM); +} + +static void swap_entries_free(struct swap_info_struct *si, + struct swap_cluster_info *ci, + swp_entry_t entry, unsigned int nr_pages) { unsigned long offset = swp_offset(entry); unsigned char *map = si->swap_map + offset; @@ -1530,7 +1536,7 @@ static void swap_entry_range_free(struct swap_info_struct *si, ci->count -= nr_pages; do { - VM_BUG_ON(*map != SWAP_HAS_CACHE); + VM_BUG_ON(!swap_is_last_ref(*map)); *map = 0; } while (++map < map_end); @@ -1553,7 +1559,7 @@ static void cluster_swap_free_nr(struct swap_info_struct *si, ci = lock_cluster(si, offset); do { if (!swap_entry_put_locked(si, offset, usage)) - swap_entry_range_free(si, ci, swp_entry(si->type, offset), 1); + swap_entries_free(si, ci, swp_entry(si->type, offset), 1); } while (++offset < end); unlock_cluster(ci); } @@ -1596,11 +1602,11 @@ void put_swap_folio(struct folio *folio, swp_entry_t entry) ci = lock_cluster(si, offset); if (swap_only_has_cache(si, offset, size)) - swap_entry_range_free(si, ci, entry, size); + swap_entries_free(si, ci, entry, size); else { for (int i = 0; i < size; i++, entry.val++) { if (!swap_entry_put_locked(si, offset + i, SWAP_HAS_CACHE)) - swap_entry_range_free(si, ci, entry, 1); + swap_entries_free(si, ci, entry, 1); } } unlock_cluster(ci); From patchwork Thu Mar 20 11:48:24 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kemeng Shi X-Patchwork-Id: 14023362 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id BC6BCC35FFF for ; Thu, 20 Mar 2025 02:53:00 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 1513A280014; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0005728001C; Wed, 19 Mar 2025 22:52:58 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C5D3828001B; Wed, 19 Mar 2025 22:52:58 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 99E1F280015 for ; Wed, 19 Mar 2025 22:52:58 -0400 (EDT) Received: from smtpin21.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 7248AB7F9E for ; Thu, 20 Mar 2025 02:52:58 +0000 (UTC) X-FDA: 83240407236.21.049DA0B Received: from dggsgout12.his.huawei.com (dggsgout12.his.huawei.com [45.249.212.56]) by imf21.hostedemail.com (Postfix) with ESMTP id 354161C0007 for ; Thu, 20 Mar 2025 02:52:54 +0000 (UTC) Authentication-Results: imf21.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf21.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.56 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1742439176; a=rsa-sha256; cv=none; b=aSqejIUGubx2cBF5mdy76ZLVDNIIT2H8tfGq/uU7URb9rMTD80Eb6p2UGlcxEYUzecsGla M7j05JUbwF1g9+J6xyF/tDZqiC99nBMNHbsEAaQbYDzL+dCqj+KmQHdFinH9h0kmVWVWKB hE6q+Hmht72DrRx/g/8p8S4OE9dGCMw= ARC-Authentication-Results: i=1; imf21.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf21.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.56 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1742439176; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=w13Ili6H5XPEUn73KQ1qRBzKLbp933IeTRokg9OeiKY=; b=tsUrhx2FbVydBAf1MYvwOuJwkG0laJDYL9RMSJpuntkPhjUvWW4WqdwGHAi2EhPu+8vYuj w7FAYV6s0wP5g0iWWoiLw7/l3NXH4YdpE0kUop+j2Loei/TCBVMZKJ5SHdoXr6yvb7HAh8 IPYYJNMZqncN/SGjliquyqk6ktCUSBE= Received: from mail.maildlp.com (unknown [172.19.163.235]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4ZJ9971gvpz4f3jcs for ; Thu, 20 Mar 2025 10:52:27 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.252]) by mail.maildlp.com (Postfix) with ESMTP id E4AB31A06DC for ; Thu, 20 Mar 2025 10:52:49 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.101.6]) by APP3 (Coremail) with SMTP id _Ch0CgAHW8X_gttnYGGmGw--.42197S5; Thu, 20 Mar 2025 10:52:49 +0800 (CST) From: Kemeng Shi To: akpm@linux-foundation.org Cc: kasong@tencent.com, tim.c.chen@linux.intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 3/8] mm: swap: use swap_entries_free() to free swap entry in swap_entry_put_locked() Date: Thu, 20 Mar 2025 19:48:24 +0800 Message-Id: <20250320114829.25751-4-shikemeng@huaweicloud.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20250320114829.25751-1-shikemeng@huaweicloud.com> References: <20250320114829.25751-1-shikemeng@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: _Ch0CgAHW8X_gttnYGGmGw--.42197S5 X-Coremail-Antispam: 1UD129KBjvJXoWxZF1DKr13Gr4xKr1ktrW3trb_yoW5XFWDpF ZIgr4DtF48Ar17Kw4UAw45ZayFvw4xWw1jqF9rGw15ZasxJryFgFyDA3y7KFyUA3s8uas8 A3WUtr17uF4jyFUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPFb4IE77IF4wAFF20E14v26ryj6rWUM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M280x2IEY4vEnII2IxkI6r1a6r45M2 8IrcIa0xkI8VA2jI8067AKxVWUWwA2048vs2IY020Ec7CjxVAFwI0_Gr0_Xr1l8cAvFVAK 0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVW7JVWDJwA2z4 x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l 84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I 8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AK xVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxVAaw2AFwI 0_JF0_Jw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG 67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r126r1DMI IYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E 14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJV W8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxUaTKu UUUUU X-CM-SenderInfo: 5vklyvpphqwq5kxd4v5lfo033gof0z/ X-Rspamd-Server: rspam07 X-Rspam-User: X-Stat-Signature: 6i6tdcqpy9n7b7sxq83ayjmry8hn9gfz X-Rspamd-Queue-Id: 354161C0007 X-HE-Tag: 1742439174-622103 X-HE-Meta: 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 eCK7Lh1h jGy00wbCkHo79EJPIozX8gDIsdtUXPhx8b2fRdocT/w2TrXkB7GTkdt4KePAooXFIWk6W47q87pctsbRfvDTx4hzlSqoLCnuAxE2Tus44xOFF/AWf02LSYHGDqc4OGKGLKT34bisgT3uYcQkjReddIPe5pVztFPuUtyDptmT6z/y8hXiv9G5vO4nvg7mMF9OxT4HbhBXQhfbp5QB+BEfWe+mK57n5WTb21vXlXK9JaDiBH0AAP6v/VghsxfSVTf5MuoFy X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: In swap_entry_put_locked(), we will set slot to SWAP_HAS_CACHE before using swap_entries_free() to do actual swap entry freeing. This introduce an unnecessary intermediate state. By using swap_entries_free() in swap_entry_put_locked(), we can eliminate the need to set slot to SWAP_HAS_CACHE. This change would make the behavior of swap_entry_put_locked() more consistent with other put() operations which will do actual free work after put last reference. Signed-off-by: Kemeng Shi Reviewed-by: Tim Chen Reviewed-by: Kairui Song --- mm/swapfile.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index 76720ca76aae..d05b58e9c723 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1348,9 +1348,11 @@ static struct swap_info_struct *_swap_info_get(swp_entry_t entry) } static unsigned char swap_entry_put_locked(struct swap_info_struct *si, - unsigned long offset, + struct swap_cluster_info *ci, + swp_entry_t entry, unsigned char usage) { + unsigned long offset = swp_offset(entry); unsigned char count; unsigned char has_cache; @@ -1382,7 +1384,7 @@ static unsigned char swap_entry_put_locked(struct swap_info_struct *si, if (usage) WRITE_ONCE(si->swap_map[offset], usage); else - WRITE_ONCE(si->swap_map[offset], SWAP_HAS_CACHE); + swap_entries_free(si, ci, entry, 1); return usage; } @@ -1461,9 +1463,7 @@ static unsigned char swap_entry_put(struct swap_info_struct *si, unsigned char usage; ci = lock_cluster(si, offset); - usage = swap_entry_put_locked(si, offset, 1); - if (!usage) - swap_entries_free(si, ci, swp_entry(si->type, offset), 1); + usage = swap_entry_put_locked(si, ci, entry, 1); unlock_cluster(ci); return usage; @@ -1558,8 +1558,8 @@ static void cluster_swap_free_nr(struct swap_info_struct *si, ci = lock_cluster(si, offset); do { - if (!swap_entry_put_locked(si, offset, usage)) - swap_entries_free(si, ci, swp_entry(si->type, offset), 1); + swap_entry_put_locked(si, ci, swp_entry(si->type, offset), + usage); } while (++offset < end); unlock_cluster(ci); } @@ -1604,10 +1604,8 @@ void put_swap_folio(struct folio *folio, swp_entry_t entry) if (swap_only_has_cache(si, offset, size)) swap_entries_free(si, ci, entry, size); else { - for (int i = 0; i < size; i++, entry.val++) { - if (!swap_entry_put_locked(si, offset + i, SWAP_HAS_CACHE)) - swap_entries_free(si, ci, entry, 1); - } + for (int i = 0; i < size; i++, entry.val++) + swap_entry_put_locked(si, ci, entry, SWAP_HAS_CACHE); } unlock_cluster(ci); } From patchwork Thu Mar 20 11:48:25 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kemeng Shi X-Patchwork-Id: 14023366 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9D777C35FFF for ; Thu, 20 Mar 2025 02:53:11 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 135CB280016; Wed, 19 Mar 2025 22:53:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id CC3FD28001A; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 88958280019; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id B6958280018 for ; Wed, 19 Mar 2025 22:52:58 -0400 (EDT) Received: from smtpin28.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 623F51C9357 for ; Thu, 20 Mar 2025 02:52:58 +0000 (UTC) X-FDA: 83240407236.28.EA4258F Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by imf05.hostedemail.com (Postfix) with ESMTP id 3806D10000E for ; Thu, 20 Mar 2025 02:52:53 +0000 (UTC) Authentication-Results: imf05.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf05.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.51 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1742439176; a=rsa-sha256; cv=none; b=gA5pD4NgzJOTJHF002XsTsiUmttp3gtLIGCK4PSTvtXPgCL3rUIgjsFpdEc9mHSgUQheHM WbxLPcCJT+Q3xEs9v8HXDU0VLADZEE/sKL78C4Jz1tyDoPNBjG0cWjT7vYqx1uaD1HrZGO Wdb3XTv3Sf8qFc3LUIu77lc63IehCBQ= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf05.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.51 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1742439176; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=4Lvyze0unUcz2Jz83pIUxPcGwcPVdToGsBfJISIHlWI=; b=OgOD0Gc8UW9J+21np6Ww+Lo23r+tTtgZshKLu23EtSX3HtOdj+gJk4lu+NdgnR8ivf7wWP X5jzipyV5MJEybYiQrZejMmQFcAYe2juVcVuLjdbpOW6AD5bBorRHkiSiN8NizF3C4kGaI 3EoR1gSBt6tzNrnObzuN2iqrkM8xNB8= Received: from mail.maildlp.com (unknown [172.19.93.142]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4ZJ99D6WBPz4f3jLm for ; Thu, 20 Mar 2025 10:52:32 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.252]) by mail.maildlp.com (Postfix) with ESMTP id 3EDE31A0E30 for ; Thu, 20 Mar 2025 10:52:50 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.101.6]) by APP3 (Coremail) with SMTP id _Ch0CgAHW8X_gttnYGGmGw--.42197S6; Thu, 20 Mar 2025 10:52:50 +0800 (CST) From: Kemeng Shi To: akpm@linux-foundation.org Cc: kasong@tencent.com, tim.c.chen@linux.intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 4/8] mm: swap: use swap_entries_free() drop last ref count in swap_entries_put_nr() Date: Thu, 20 Mar 2025 19:48:25 +0800 Message-Id: <20250320114829.25751-5-shikemeng@huaweicloud.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20250320114829.25751-1-shikemeng@huaweicloud.com> References: <20250320114829.25751-1-shikemeng@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: _Ch0CgAHW8X_gttnYGGmGw--.42197S6 X-Coremail-Antispam: 1UD129KBjvdXoWrKrWUWrWrAr4fuw4Utw43ZFb_yoWfuFb_ua 9Yy34kCw4UJF1DGw17tr1jvr9Ygw4qyF1rZr1ftFWayF1rJF95ZwsFgr98Aw10yw40vrn3 Aanaqrn5Ar1DujkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbqkYFVCjjxCrM7AC8VAFwI0_Wr0E3s1l1xkIjI8I6I8E6xAIw20E Y4v20xvaj40_Wr0E3s1l1IIY67AEw4v_Jr0_Jr4l87I20VAvwVAaII0Ic2I_JFv_Gryl82 xGYIkIc2x26280x7IE14v26r126s0DM28IrcIa0xkI8VCY1x0267AKxVW8JVW5JwA2ocxC 64kIII0Yj41l84x0c7CEw4AK67xGY2AK021l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM2 8EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4UJVWxJr1l84ACjcxK6I8E87Iv67AKxVW0oVCq 3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_GcCE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8w Aqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E2Ix0cI8IcVAFwI0_Jr0_Jr4lYx0Ex4A2jsIE 14v26r1j6r4UMcvjeVCFs4IE7xkEbVWUJVW8JwACjcxG0xvY0x0EwIxGrwCY1x0262kKe7 AKxVWUAVWUtwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02 F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_JF0_Jw 1lIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7Cj xVAFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r 1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x07jv Wl9UUUUU= X-CM-SenderInfo: 5vklyvpphqwq5kxd4v5lfo033gof0z/ X-Stat-Signature: g8dyu7oxmk3zre53uid1w65te6k5ymrx X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 3806D10000E X-Rspam-User: X-HE-Tag: 1742439173-975844 X-HE-Meta: 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 zh+/AWet TSJCNkn9Bt74cVVcMxhea/sDqIrhPGWZFSyJYHHmM6d0SApgnlM9ymnU90bRogYg65ri+w63viZQZ+4QHXoLz6fjZiAnlueTPDbDYvWP5UoIY2SoKTIX2g8mXSjmctAre0gcUIWqH+X5If+lENefwaqzA/aTsH+U06ngMVDsRtzEXnIR4PtmiWe1EMfoUrcAROvt83COW90GkMCUNPKFDeGpV5+yvjhcu/M1ZUgY9Ae3/5IY= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Use swap_entries_free() to directly free swap entries when the swap entries are not cached and referenced, without needing to set swap entries to set intermediate SWAP_HAS_CACHE state. Signed-off-by: Kemeng Shi Reviewed-by: Tim Chen --- mm/swapfile.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index d05b58e9c723..e83519fbd40e 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1490,10 +1490,11 @@ static bool swap_entries_put_nr(struct swap_info_struct *si, unlock_cluster(ci); goto fallback; } - for (i = 0; i < nr; i++) - WRITE_ONCE(si->swap_map[offset + i], SWAP_HAS_CACHE); if (!has_cache) swap_entries_free(si, ci, entry, nr); + else + for (i = 0; i < nr; i++) + WRITE_ONCE(si->swap_map[offset + i], SWAP_HAS_CACHE); unlock_cluster(ci); return has_cache; From patchwork Thu Mar 20 11:48:26 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kemeng Shi X-Patchwork-Id: 14023361 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 06C59C35FFC for ; Thu, 20 Mar 2025 02:53:03 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4D84C280013; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2E518280019; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EDAB0280015; Wed, 19 Mar 2025 22:52:58 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 98FD1280014 for ; Wed, 19 Mar 2025 22:52:58 -0400 (EDT) Received: from smtpin24.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 6F4671409FA for ; Thu, 20 Mar 2025 02:52:58 +0000 (UTC) X-FDA: 83240407236.24.E5FF2CC Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by imf13.hostedemail.com (Postfix) with ESMTP id B940620005 for ; Thu, 20 Mar 2025 02:52:54 +0000 (UTC) Authentication-Results: imf13.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf13.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.51 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1742439176; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3BrxKAMMgrm5u6kH6fqiPDpUFnzes7VVdvIUVB9WPP4=; b=0VuwECEKCa8HGMpqEHC0h7AsO/exaW3TDAD6PAfjcZEsZksVUPRo0Goyf+kIDii6Rsazxq AVtWrbeJEVO3Z3bFF5NubxDCuYbzIY7VrrPqyXwvQFUdgKlU+HkzwEKe93Mi6DeDeKwwmq r+qRBCqYohDzgSGHRvg6QXjvmLF8h+I= ARC-Authentication-Results: i=1; imf13.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf13.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.51 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1742439176; a=rsa-sha256; cv=none; b=P1QHI6g2PhPxZsQwlfuWPiZ55AoTrMe2LaAcT1iwtOtQoR7fCYGd151H0qL/xHZicXl3TW YULd9MQqCBdRmJ8+03dO/NuuIpGqnTmri6B/prPXenxqtosWgeF5nwt5d1lLP6L1ofEbMg ZmzDABYlo5JLuZ3IGzIwWIm/SFBzM1U= Received: from mail.maildlp.com (unknown [172.19.163.235]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4ZJ99F1m9bz4f3jYl for ; Thu, 20 Mar 2025 10:52:33 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.252]) by mail.maildlp.com (Postfix) with ESMTP id 8EEB21A06D7 for ; Thu, 20 Mar 2025 10:52:50 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.101.6]) by APP3 (Coremail) with SMTP id _Ch0CgAHW8X_gttnYGGmGw--.42197S7; Thu, 20 Mar 2025 10:52:50 +0800 (CST) From: Kemeng Shi To: akpm@linux-foundation.org Cc: kasong@tencent.com, tim.c.chen@linux.intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 5/8] mm: swap: drop last SWAP_MAP_SHMEM flag in batch in swap_entries_put_nr() Date: Thu, 20 Mar 2025 19:48:26 +0800 Message-Id: <20250320114829.25751-6-shikemeng@huaweicloud.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20250320114829.25751-1-shikemeng@huaweicloud.com> References: <20250320114829.25751-1-shikemeng@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: _Ch0CgAHW8X_gttnYGGmGw--.42197S7 X-Coremail-Antispam: 1UD129KBjvJXoWrKF1Dtry5ur18tryxAw1kKrg_yoW8Jr18pF 4Fq34DKF48tr17AFW7A3Z8Cry5Kr1vkF1Yqry7G34fA3s5tw45u3s2yayrA3WjqFnYyFyY g3ZFgryxuFyvqrUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPab4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M280x2IEY4vEnII2IxkI6r1a6r45M2 8IrcIa0xkI8VA2jI8067AKxVWUAVCq3wA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAv FVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3w A2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE 3s1l84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr2 1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv 67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxVAaw2 AFwI0_JF0_Jw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAq x4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r126r 1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_JFI_Gr1lIxAIcVC0I7IYx2IY6xkF 7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxV WUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxU s3kuDUUUU X-CM-SenderInfo: 5vklyvpphqwq5kxd4v5lfo033gof0z/ X-Rspam-User: X-Rspamd-Queue-Id: B940620005 X-Rspamd-Server: rspam08 X-Stat-Signature: aomodhbctj4qx8azafh6d5byo673omsz X-HE-Tag: 1742439174-293445 X-HE-Meta: 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 kcz+HIh/ gH1r7loc7Xy0kAUwfSCbVXh4mmIzl+0wtTk2GeAPS3PodKlZXwND/vyGwKFZNRrD+JSyUf4AG1IYwKe+SWpQkHWJwAVNZFEYprlZjHAVSkOZWWF52Sk8hX+HH6JML+cjW0G720AaF+Oy7ZJ0+Z8Rx5M9aKq8wDgnYzwp/XlyQm7Jm/ecjPV/A9dQZGoovL0ln40bmcmf7F33yAQyAGpdPbo8dozlRI/uQfDcVgVILCHUluNE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The SWAP_MAP_SHMEM indicates last map from shmem. Therefore we can drop SWAP_MAP_SHMEM in batch in similar way to drop last ref count in batch. Signed-off-by: Kemeng Shi Reviewed-by: Tim Chen --- mm/swapfile.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index e83519fbd40e..6f11619665e8 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -192,7 +192,7 @@ static bool swap_is_last_map(struct swap_info_struct *si, unsigned char *map_end = map + nr_pages; unsigned char count = *map; - if (swap_count(count) != 1) + if (swap_count(count) != 1 && swap_count(count) != SWAP_MAP_SHMEM) return false; while (++map < map_end) { @@ -1479,7 +1479,10 @@ static bool swap_entries_put_nr(struct swap_info_struct *si, unsigned char count; int i; - if (nr <= 1 || swap_count(data_race(si->swap_map[offset])) != 1) + if (nr <= 1) + goto fallback; + count = swap_count(data_race(si->swap_map[offset])); + if (count != 1 && count != SWAP_MAP_SHMEM) goto fallback; /* cross into another cluster */ if (nr > SWAPFILE_CLUSTER - offset % SWAPFILE_CLUSTER) From patchwork Thu Mar 20 11:48:27 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kemeng Shi X-Patchwork-Id: 14023363 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4C5A0C36002 for ; Thu, 20 Mar 2025 02:53:05 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 81870280015; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7A018280017; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3593D280015; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 9E84D280016 for ; Wed, 19 Mar 2025 22:52:58 -0400 (EDT) Received: from smtpin26.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 6AFAFC09C0 for ; Thu, 20 Mar 2025 02:52:58 +0000 (UTC) X-FDA: 83240407236.26.D6544CF Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by imf17.hostedemail.com (Postfix) with ESMTP id B3ED640002 for ; Thu, 20 Mar 2025 02:52:54 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf17.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.51 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1742439176; a=rsa-sha256; cv=none; b=VlouvArnE/kI9oMAd680T+2/2uTgGg+NN5/s9RqGgHiLUWvUJ2WYIZeTSRcVttJp695XXh dyidnVmfGQPCbx1nHGJ6vRfPNsQz7llYSgrkppLDvHuOGMYz1SjSKspE2slO/BkftQaf3t lV35Ux5tOa66abcADJ5XxxsmbossS18= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf17.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.51 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1742439176; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QH6dKgQAdqVdSvPdFPWwhbGFKwf5MGYy6/tO3R6VlHE=; b=iR+CVLIz9u0CoAT7QDGaay41o0QsHwTuwNicdk0nQ3T1CAedwLLBHdcbQnLKQcPzdX+YBO AsNQopd0pUofbfuqBtazG8jEPT9m6vXJXkjtSlfue1w+CKdBofPfrFE7qYUDEtqyNQvgXZ vLfnZnC+Hxggr1T4KjsKItz3qY3pmGE= Received: from mail.maildlp.com (unknown [172.19.163.235]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4ZJ9964x0qz4f3lWF for ; Thu, 20 Mar 2025 10:52:26 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.252]) by mail.maildlp.com (Postfix) with ESMTP id D3A7D1A058E for ; Thu, 20 Mar 2025 10:52:50 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.101.6]) by APP3 (Coremail) with SMTP id _Ch0CgAHW8X_gttnYGGmGw--.42197S8; Thu, 20 Mar 2025 10:52:50 +0800 (CST) From: Kemeng Shi To: akpm@linux-foundation.org Cc: kasong@tencent.com, tim.c.chen@linux.intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 6/8] mm: swap: free each cluster individually in swap_entries_put_map_nr() Date: Thu, 20 Mar 2025 19:48:27 +0800 Message-Id: <20250320114829.25751-7-shikemeng@huaweicloud.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20250320114829.25751-1-shikemeng@huaweicloud.com> References: <20250320114829.25751-1-shikemeng@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: _Ch0CgAHW8X_gttnYGGmGw--.42197S8 X-Coremail-Antispam: 1UD129KBjvJXoWxGry5Jw13Kr4xGr48CF17Wrg_yoWrtr4UpF yagrn8Krs7Xr43Jr4xJw4DZrWru3ykWF1Uta47Gr1SywnxCr1rWFyvy3ySgFyUC34kur90 y3W7K347uFs0qr7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPab4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M280x2IEY4vEnII2IxkI6r1a6r45M2 8IrcIa0xkI8VA2jI8067AKxVWUAVCq3wA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAv FVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3w A2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE 3s1l84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr2 1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv 67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxVAaw2 AFwI0_JF0_Jw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAq x4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r126r 1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_JFI_Gr1lIxAIcVC0I7IYx2IY6xkF 7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxV WUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxU s3kuDUUUU X-CM-SenderInfo: 5vklyvpphqwq5kxd4v5lfo033gof0z/ X-Rspamd-Server: rspam07 X-Rspam-User: X-Stat-Signature: g3u63do9g8z3e1it6wyif6r5porwx4h1 X-Rspamd-Queue-Id: B3ED640002 X-HE-Tag: 1742439174-709141 X-HE-Meta: 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 ye7B9h3l Qs4z7/DfnqJQlnttnBUkHrNLurfBKu+gZSJ7ezlYjLjPu7NrSu9um/4UljdvnUoIFj+9S128YH90EDE7oS5kwPbCp1btUFU+KqFnQbEizi3PeO8h4mJ4p+CRyPj7vI6+1Kvn5rHHkNr8NgaIqrqmN+1qa2rQy2N/naz6iBh8BuwCJSTH093VXmhpJ0gg0ZsJT0OZ1eHSp/XVvSpD2Hw4tY6AFvag7sGPYkcTz4XAydmKXkxA= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 1. Factor out general swap_entries_put_map() helper to drop entries belong to one cluster. If entries are last map, free entries in batch, otherwise put entries with cluster lock acquired and released only once. 2. Iterate and call swap_entries_put_map() for each cluster in swap_entries_put_nr() to leverage batch-remove for last map belong to one cluster and reduce lock acquire/release in fallback case. 3. As swap_entries_put_nr() won't handle SWAP_HSA_CACHE drop, rename it to swap_entries_put_map_nr(). 4. As we won't drop each entry invidually with swap_entry_put() now, do reclaim in free_swap_and_cache_nr() is because swap_entries_put_map_nr() is general routine to drop reference and the relcaim work should only be done in free_swap_and_cache_nr(). Remove stale comment accordingly. Signed-off-by: Kemeng Shi Reviewed-by: Tim Chen --- mm/swapfile.c | 70 +++++++++++++++++++++++---------------------------- 1 file changed, 32 insertions(+), 38 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index 6f11619665e8..646efccdd2ec 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1455,25 +1455,10 @@ struct swap_info_struct *get_swap_device(swp_entry_t entry) return NULL; } -static unsigned char swap_entry_put(struct swap_info_struct *si, - swp_entry_t entry) -{ - struct swap_cluster_info *ci; - unsigned long offset = swp_offset(entry); - unsigned char usage; - - ci = lock_cluster(si, offset); - usage = swap_entry_put_locked(si, ci, entry, 1); - unlock_cluster(ci); - - return usage; -} - -static bool swap_entries_put_nr(struct swap_info_struct *si, - swp_entry_t entry, int nr) +static bool swap_entries_put_map(struct swap_info_struct *si, + swp_entry_t entry, int nr) { unsigned long offset = swp_offset(entry); - unsigned int type = swp_type(entry); struct swap_cluster_info *ci; bool has_cache = false; unsigned char count; @@ -1484,14 +1469,10 @@ static bool swap_entries_put_nr(struct swap_info_struct *si, count = swap_count(data_race(si->swap_map[offset])); if (count != 1 && count != SWAP_MAP_SHMEM) goto fallback; - /* cross into another cluster */ - if (nr > SWAPFILE_CLUSTER - offset % SWAPFILE_CLUSTER) - goto fallback; ci = lock_cluster(si, offset); if (!swap_is_last_map(si, offset, nr, &has_cache)) { - unlock_cluster(ci); - goto fallback; + goto locked_fallback; } if (!has_cache) swap_entries_free(si, ci, entry, nr); @@ -1503,15 +1484,34 @@ static bool swap_entries_put_nr(struct swap_info_struct *si, return has_cache; fallback: - for (i = 0; i < nr; i++) { - if (data_race(si->swap_map[offset + i])) { - count = swap_entry_put(si, swp_entry(type, offset + i)); - if (count == SWAP_HAS_CACHE) - has_cache = true; - } else { - WARN_ON_ONCE(1); - } + ci = lock_cluster(si, offset); +locked_fallback: + for (i = 0; i < nr; i++, entry.val++) { + count = swap_entry_put_locked(si, ci, entry, 1); + if (count == SWAP_HAS_CACHE) + has_cache = true; + } + unlock_cluster(ci); + return has_cache; + +} + +static bool swap_entries_put_map_nr(struct swap_info_struct *si, + swp_entry_t entry, int nr) +{ + int cluster_nr, cluster_rest; + unsigned long offset = swp_offset(entry); + bool has_cache = false; + + cluster_rest = SWAPFILE_CLUSTER - offset % SWAPFILE_CLUSTER; + while (nr) { + cluster_nr = min(nr, cluster_rest); + has_cache |= swap_entries_put_map(si, entry, cluster_nr); + cluster_rest = SWAPFILE_CLUSTER; + nr -= cluster_nr; + entry.val += cluster_nr; } + return has_cache; } @@ -1806,7 +1806,7 @@ void free_swap_and_cache_nr(swp_entry_t entry, int nr) /* * First free all entries in the range. */ - any_only_cache = swap_entries_put_nr(si, entry, nr); + any_only_cache = swap_entries_put_map_nr(si, entry, nr); /* * Short-circuit the below loop if none of the entries had their @@ -1816,13 +1816,7 @@ void free_swap_and_cache_nr(swp_entry_t entry, int nr) goto out; /* - * Now go back over the range trying to reclaim the swap cache. This is - * more efficient for large folios because we will only try to reclaim - * the swap once per folio in the common case. If we do - * swap_entry_put() and __try_to_reclaim_swap() in the same loop, the - * latter will get a reference and lock the folio for every individual - * page but will only succeed once the swap slot for every subpage is - * zero. + * Now go back over the range trying to reclaim the swap cache. */ for (offset = start_offset; offset < end_offset; offset += nr) { nr = 1; From patchwork Thu Mar 20 11:48:28 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kemeng Shi X-Patchwork-Id: 14023368 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 510D7C36002 for ; Thu, 20 Mar 2025 02:53:16 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B542228001A; Wed, 19 Mar 2025 22:53:03 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B046C280019; Wed, 19 Mar 2025 22:53:03 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9817428001A; Wed, 19 Mar 2025 22:53:03 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 71B87280019 for ; Wed, 19 Mar 2025 22:53:03 -0400 (EDT) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 62636B7F7C for ; Thu, 20 Mar 2025 02:53:03 +0000 (UTC) X-FDA: 83240407446.23.B4766FD Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by imf15.hostedemail.com (Postfix) with ESMTP id 07FFFA0006 for ; Thu, 20 Mar 2025 02:53:00 +0000 (UTC) Authentication-Results: imf15.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf15.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.51 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1742439181; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Tp0/ysp3nLQQHGfaUf0+hlrtUQ5JR9wezteM5dANrb0=; b=f5f4wvBOur2RJVSTDJv1kjjcH9jHpXien0GcO3UPZJXVZI23Ppl7mM1KllRbyRDPGicQnI znJNuZJc7VVs4khCcCLqn/T0z/QHMw4GRh10k7R0E98MfZ3ZEx2qwf/uwOTP8khLiqphe+ BYQGI6WCSRRaQTqBjstTt+VluOSSaSo= ARC-Authentication-Results: i=1; imf15.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf15.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.51 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1742439181; a=rsa-sha256; cv=none; b=4RqtYxff4Xi9Z6O5EOdDxeaC4tGhcFZ3d/L4PqE7zU+nvyubLUZcCNvuNxO/v/M6K2lgGE xw0D7Il8vzuF+yNrO4AhZCAivQ0beNk3R5OqQvPykX9q0San2UjA5nM5nWOydLvnI2GQ9o W8IZO1ZavQw+iytOulUsy83ssALGo1M= Received: from mail.maildlp.com (unknown [172.19.163.235]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4ZJ99F5jP8z4f3jt8 for ; Thu, 20 Mar 2025 10:52:33 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.252]) by mail.maildlp.com (Postfix) with ESMTP id 23B2B1A058E for ; Thu, 20 Mar 2025 10:52:51 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.101.6]) by APP3 (Coremail) with SMTP id _Ch0CgAHW8X_gttnYGGmGw--.42197S9; Thu, 20 Mar 2025 10:52:51 +0800 (CST) From: Kemeng Shi To: akpm@linux-foundation.org Cc: kasong@tencent.com, tim.c.chen@linux.intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 7/8] mm: swap: factor out helper to drop cache of entries within a single cluster Date: Thu, 20 Mar 2025 19:48:28 +0800 Message-Id: <20250320114829.25751-8-shikemeng@huaweicloud.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20250320114829.25751-1-shikemeng@huaweicloud.com> References: <20250320114829.25751-1-shikemeng@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: _Ch0CgAHW8X_gttnYGGmGw--.42197S9 X-Coremail-Antispam: 1UD129KBjvJXoW7uFWkAFy5WF48GF4xGFWkCrg_yoW8ZryxpF 9Igwn8Kr48Xr13Gw4xXw45JayFv3yxW3W2qFy7Gr1av3Z3Jr10gFyqyrWa9ry5CrykuF98 Ca4DKry2gF4jyF7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPab4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M280x2IEY4vEnII2IxkI6r1a6r45M2 8IrcIa0xkI8VA2jI8067AKxVWUAVCq3wA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAv FVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3w A2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE 3s1l84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr2 1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv 67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxVAaw2 AFwI0_JF0_Jw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAq x4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r126r 1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_JFI_Gr1lIxAIcVC0I7IYx2IY6xkF 7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxV WUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxU s3kuDUUUU X-CM-SenderInfo: 5vklyvpphqwq5kxd4v5lfo033gof0z/ X-Rspam-User: X-Rspamd-Queue-Id: 07FFFA0006 X-Rspamd-Server: rspam08 X-Stat-Signature: bbesg83dh879t7qpkjoc6fhi6b7bre99 X-HE-Tag: 1742439180-729340 X-HE-Meta: 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 JMAL2CE8 irDYDyO4s07qxXemvOOUINpQoNEIbexXIQJA+We26Gpfhpu3O+Z72PpHWaw3WxsKmQZns76UwT6B7/oZgiZiv9aiirRFXoprC+fB9VJQbG24cyyOfz21jNK1ujx6tIjLvfrKU2TJGV2ai47kjNQJmFtbdBD31xUDGkVrxsJG0EnGl+gXuLnyK2N0Yl1IlrUR+nkyN X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Factor out helper swap_entries_put_cache() from put_swap_folio() to server as a general-purpose routine for dropping cache flag of entries within a single cluster. Signed-off-by: Kemeng Shi Reviewed-by: Tim Chen --- mm/swapfile.c | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index 646efccdd2ec..40a7d75c01e8 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1455,6 +1455,22 @@ struct swap_info_struct *get_swap_device(swp_entry_t entry) return NULL; } +static void swap_entries_put_cache(struct swap_info_struct *si, + swp_entry_t entry, int nr) +{ + unsigned long offset = swp_offset(entry); + struct swap_cluster_info *ci; + + ci = lock_cluster(si, offset); + if (swap_only_has_cache(si, offset, nr)) + swap_entries_free(si, ci, entry, nr); + else { + for (int i = 0; i < nr; i++, entry.val++) + swap_entry_put_locked(si, ci, entry, SWAP_HAS_CACHE); + } + unlock_cluster(ci); +} + static bool swap_entries_put_map(struct swap_info_struct *si, swp_entry_t entry, int nr) { @@ -1595,8 +1611,6 @@ void swap_free_nr(swp_entry_t entry, int nr_pages) */ void put_swap_folio(struct folio *folio, swp_entry_t entry) { - unsigned long offset = swp_offset(entry); - struct swap_cluster_info *ci; struct swap_info_struct *si; int size = 1 << swap_entry_order(folio_order(folio)); @@ -1604,14 +1618,7 @@ void put_swap_folio(struct folio *folio, swp_entry_t entry) if (!si) return; - ci = lock_cluster(si, offset); - if (swap_only_has_cache(si, offset, size)) - swap_entries_free(si, ci, entry, size); - else { - for (int i = 0; i < size; i++, entry.val++) - swap_entry_put_locked(si, ci, entry, SWAP_HAS_CACHE); - } - unlock_cluster(ci); + swap_entries_put_cache(si, entry, size); } int __swap_count(swp_entry_t entry) From patchwork Thu Mar 20 11:48:29 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kemeng Shi X-Patchwork-Id: 14023367 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9343C35FFC for ; Thu, 20 Mar 2025 02:53:13 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3F6B5280017; Wed, 19 Mar 2025 22:53:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 09FA5280019; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A35F5280016; Wed, 19 Mar 2025 22:52:59 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id C5ABC28001A for ; Wed, 19 Mar 2025 22:52:58 -0400 (EDT) Received: from smtpin06.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id AB93AB7FA8 for ; Thu, 20 Mar 2025 02:52:58 +0000 (UTC) X-FDA: 83240407236.06.4320F37 Received: from dggsgout12.his.huawei.com (dggsgout12.his.huawei.com [45.249.212.56]) by imf07.hostedemail.com (Postfix) with ESMTP id 4AC7940007 for ; Thu, 20 Mar 2025 02:52:55 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf07.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.56 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1742439177; a=rsa-sha256; cv=none; b=nS95GKruYb+YgWhP/4PMCyDnuxxZ9TH/BHEA0rvOGMKod1xOxZV9R7D2llD7ZMPdX410vC SWR/6qTwGILxdWZpIat9Br0v47WBvcs+xnzW/ItNMjOxoos0rtYJsd1Iqfx1DjghOGxwFC QSXhf+Tp3Mbp+FA5FooEEjIVJ1IAGXg= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf07.hostedemail.com: domain of shikemeng@huaweicloud.com designates 45.249.212.56 as permitted sender) smtp.mailfrom=shikemeng@huaweicloud.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1742439177; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+nB5yvayjgNcX/Chl87fBU5Xsm6igsVeO3k8ELr2hiQ=; b=cJ5ccaLmyH43BmVciz7P1gRSYv3bxoiX+YL8nR7Y3lu/7dyIW+bkZT4pmuPktVd6axcihQ xnmjpYvpYe0u6s4hJaNU2BpAXjr8ajem5MKhy60LvUwGkBpP3XetVdlfEByINVh4GdYbTt bUKKL1k5qS0f47RE5nGEQRddg2E/LLE= Received: from mail.maildlp.com (unknown [172.19.93.142]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4ZJ9986yhvz4f3jch for ; Thu, 20 Mar 2025 10:52:28 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.252]) by mail.maildlp.com (Postfix) with ESMTP id A53EC1A109D for ; Thu, 20 Mar 2025 10:52:51 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.101.6]) by APP3 (Coremail) with SMTP id _Ch0CgAHW8X_gttnYGGmGw--.42197S10; Thu, 20 Mar 2025 10:52:51 +0800 (CST) From: Kemeng Shi To: akpm@linux-foundation.org Cc: kasong@tencent.com, tim.c.chen@linux.intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 8/8] mm: swap: replace cluster_swap_free_nr() with swap_entries_put_[map/cache]() Date: Thu, 20 Mar 2025 19:48:29 +0800 Message-Id: <20250320114829.25751-9-shikemeng@huaweicloud.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20250320114829.25751-1-shikemeng@huaweicloud.com> References: <20250320114829.25751-1-shikemeng@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: _Ch0CgAHW8X_gttnYGGmGw--.42197S10 X-Coremail-Antispam: 1UD129KBjvJXoWxCF1DJr1rCFWUGryxXF4rGrg_yoW5XF4kpF Z3Wwn8Kr4xJr1xGr4xXw4DZFya9397W3WUJFy7Ww1rZasFkryIqF1vyrZ7Cry5G34kuFZI k3W7tr9ruFs0yr7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPab4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M280x2IEY4vEnII2IxkI6r1a6r45M2 8IrcIa0xkI8VA2jI8067AKxVWUAVCq3wA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAv FVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3w A2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE 3s1l84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr2 1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv 67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxVAaw2 AFwI0_JF0_Jw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAq x4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r126r 1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_JFI_Gr1lIxAIcVC0I7IYx2IY6xkF 7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxV W8JVWxJwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxU s3kuDUUUU X-CM-SenderInfo: 5vklyvpphqwq5kxd4v5lfo033gof0z/ X-Rspamd-Server: rspam07 X-Rspam-User: X-Stat-Signature: htxzfismoxa9buuu4nd4cxu57tpf5gax X-Rspamd-Queue-Id: 4AC7940007 X-HE-Tag: 1742439175-101791 X-HE-Meta: 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 FR6+1qHz Ul4zCXR1vdedHkKQt29ANmPciwvNnMcb/2X/sYTy3zRMiGyNtyQ9ekvHgozOc55owbZvFmuRh/lptam5MVy3OWMHdswVp6yLlzkrfPg4IhE0bMmaKBUDmtOw8/XdB4BvAPd0AxZusP2DGC3UqEfttsG+8hbJmEFVQQAWDPi3k+ooygrgKPGahQ2BhFh3Y5k3zW5pSQU6kz2xgNZPGOCy3oLiHlBO2rvbUCsX574uJLA0kH5d1xUlKu3Xf7w== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Replace cluster_swap_free_nr() with swap_entries_put_[map/cache]() to remove repeat code and leverage batch-remove for entries with last flag. After removing cluster_swap_free_nr, only functions with "_nr" suffix could free entries spanning cross clusters. Add corresponding description in comment of swap_entries_put_map_nr() as is first function with "_nr" suffix and have a non-suffix variant function swap_entries_put_map(). Signed-off-by: Kemeng Shi Reviewed-by: Tim Chen --- mm/swapfile.c | 30 +++++++++++------------------- 1 file changed, 11 insertions(+), 19 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index 40a7d75c01e8..c46b56d636af 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1512,6 +1512,11 @@ static bool swap_entries_put_map(struct swap_info_struct *si, } +/* + * Only functions with "_nr" suffix are able to free entries spanning + * cross multi clusters, so ensure the range is within a single cluster + * when freeing entries with functions without "_nr" suffix. + */ static bool swap_entries_put_map_nr(struct swap_info_struct *si, swp_entry_t entry, int nr) { @@ -1569,21 +1574,6 @@ static void swap_entries_free(struct swap_info_struct *si, partial_free_cluster(si, ci); } -static void cluster_swap_free_nr(struct swap_info_struct *si, - unsigned long offset, int nr_pages, - unsigned char usage) -{ - struct swap_cluster_info *ci; - unsigned long end = offset + nr_pages; - - ci = lock_cluster(si, offset); - do { - swap_entry_put_locked(si, ci, swp_entry(si->type, offset), - usage); - } while (++offset < end); - unlock_cluster(ci); -} - /* * Caller has made sure that the swap device corresponding to entry * is still around or has not been recycled. @@ -1600,7 +1590,7 @@ void swap_free_nr(swp_entry_t entry, int nr_pages) while (nr_pages) { nr = min_t(int, nr_pages, SWAPFILE_CLUSTER - offset % SWAPFILE_CLUSTER); - cluster_swap_free_nr(sis, offset, nr, 1); + swap_entries_put_map(sis, swp_entry(sis->type, offset), nr); offset += nr; nr_pages -= nr; } @@ -3623,11 +3613,13 @@ int swapcache_prepare(swp_entry_t entry, int nr) return __swap_duplicate(entry, SWAP_HAS_CACHE, nr); } +/* + * Caller should ensure entries belong to the same folio so + * the entries won't span cross cluster boundary. + */ void swapcache_clear(struct swap_info_struct *si, swp_entry_t entry, int nr) { - unsigned long offset = swp_offset(entry); - - cluster_swap_free_nr(si, offset, nr, SWAP_HAS_CACHE); + swap_entries_put_cache(si, entry, nr); } struct swap_info_struct *swp_swap_info(swp_entry_t entry)