From patchwork Thu Dec 16 12:46:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 12681003 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 F246BC433EF for ; Thu, 16 Dec 2021 12:48:28 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5072B6B0074; Thu, 16 Dec 2021 07:47:40 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 4B6656B0075; Thu, 16 Dec 2021 07:47:40 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 361EE6B0078; Thu, 16 Dec 2021 07:47:40 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0232.hostedemail.com [216.40.44.232]) by kanga.kvack.org (Postfix) with ESMTP id 271926B0074 for ; Thu, 16 Dec 2021 07:47:40 -0500 (EST) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id E01E6805CD for ; Thu, 16 Dec 2021 12:47:29 +0000 (UTC) X-FDA: 78923633418.18.01C85C9 Received: from mail-pg1-f175.google.com (mail-pg1-f175.google.com [209.85.215.175]) by imf07.hostedemail.com (Postfix) with ESMTP id 82CDB4001C for ; Thu, 16 Dec 2021 12:47:29 +0000 (UTC) Received: by mail-pg1-f175.google.com with SMTP id m15so22961987pgu.11 for ; Thu, 16 Dec 2021 04:47:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=FZO8o/6nmS/AB/Y+FEyoU4o2a64gHGdYUJrc5cfoUJU=; b=dBRurJQMHLxHKQn3s0wzrbMfegHpQInZ2Y2X5coN5rmjuFdfjw+F+EO0X8XzIVHPq1 0oyGpb6qJvTUzNx6Blu62Qn80wHaUeVXX2fQ9koDZdIxzxal1jqgUAMmrTp4FpBB8+lC HhhFQaRsiZg5RCI98t3POHEYuCZbrNI5RR9NZ/nvsrg2aRXWCHosp4cK/v4yHYbDKqE2 BfNWaGBaDFFq5B70PfMTfdd5+4G/VFByvxJ3fYviHpo+1mK8OhP253zIp2GQLsFd9K7K 5xf/lQzf1ztcRwn4ubgDIaUrppkUhsDvHEZAw457QCc86ssUcU9B/9K8ZGBiuX8qXe50 2zkQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=FZO8o/6nmS/AB/Y+FEyoU4o2a64gHGdYUJrc5cfoUJU=; b=zNAOFu6WJupoZ7minNyD2zWTerRlE+xmhZ8J+DZCo9X6zZCOpsBCjU9t8T0ya2G8p/ aq/YADMeNKv3MocVW4fuONr2ADCCaTBafmXGlpO5j6yriU7yRN3brsS5EavmdSBDNtHB YJLnfpqWUSd8mdZYuDPsIHF4v8QbNfb1t4Wk0X/MSw+8CPwBarBquVam1NrJjMvhaNcx GG2h3Uc2To8nIxfnMXdzTqnRMkr/l/35CJLnh7GPrpVOYj2XFKg/6ZgWZgGwjEHEOQTi IxO8IJkPmyCkzGMCr8FV1NDsR3v4ylxY6+xlwzRHO/5VYbRHqgIpsGqDBQgnBX1+jAXP QOQw== X-Gm-Message-State: AOAM531Dgl5VPZfxK/kNkEBOsVosv/YMvQI+os63z+Rtnkl6tmpEDGgD Y+m8AVu96bipN6GMgOGt+eE5gQ== X-Google-Smtp-Source: ABdhPJzRLr96USwclRnMtuYoyYf51O2soUQ74CnMn6MZx9+rbSLOwQR2RSEL+P11/DED3hWVzwyh2Q== X-Received: by 2002:a63:4e5f:: with SMTP id o31mr12052991pgl.384.1639658848300; Thu, 16 Dec 2021 04:47:28 -0800 (PST) Received: from C02DW0BEMD6R.bytedance.net ([139.177.225.243]) by smtp.gmail.com with ESMTPSA id h5sm6154309pfi.46.2021.12.16.04.47.25 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 16 Dec 2021 04:47:27 -0800 (PST) From: Qi Zheng To: akpm@linux-foundation.org, gregkh@linuxfoundation.org, rafael@kernel.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, songmuchun@bytedance.com, Qi Zheng Subject: [PATCH 2/2] mm: reimplement si_mem_available() Date: Thu, 16 Dec 2021 20:46:55 +0800 Message-Id: <20211216124655.32247-3-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20211216124655.32247-1-zhengqi.arch@bytedance.com> References: <20211216124655.32247-1-zhengqi.arch@bytedance.com> MIME-Version: 1.0 Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=bytedance-com.20210112.gappssmtp.com header.s=20210112 header.b=dBRurJQM; dmarc=pass (policy=none) header.from=bytedance.com; spf=pass (imf07.hostedemail.com: domain of zhengqi.arch@bytedance.com designates 209.85.215.175 as permitted sender) smtp.mailfrom=zhengqi.arch@bytedance.com X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 82CDB4001C X-Stat-Signature: dutr5uo57ky1hfwuzc5984b3okbsxuuq X-HE-Tag: 1639658849-367636 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: Reimplement si_mem_available() by reusing si_mem_available_node(). Signed-off-by: Qi Zheng Reported-by: kernel test robot Reported-by: kernel test robot Reported-by: kernel test robot --- mm/page_alloc.c | 45 +++++++-------------------------------------- 1 file changed, 7 insertions(+), 38 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 31f5e3e335cf..0982372c8e49 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5782,46 +5782,15 @@ long si_mem_available_node(struct sysinfo *val, int nid) long si_mem_available(void) { - long available; - unsigned long pagecache; - unsigned long wmark_low = 0; - unsigned long pages[NR_LRU_LISTS]; - unsigned long reclaimable; - struct zone *zone; - int lru; - - for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++) - pages[lru] = global_node_page_state(NR_LRU_BASE + lru); - - for_each_zone(zone) - wmark_low += low_wmark_pages(zone); - - /* - * Estimate the amount of memory available for userspace allocations, - * without causing swapping. - */ - available = global_zone_page_state(NR_FREE_PAGES) - totalreserve_pages; - - /* - * Not all the page cache can be freed, otherwise the system will - * start swapping. Assume at least half of the page cache, or the - * low watermark worth of cache, needs to stay. - */ - pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE]; - pagecache -= min(pagecache / 2, wmark_low); - available += pagecache; + long available = 0; + struct sysinfo i; + int nid; - /* - * Part of the reclaimable slab and other kernel memory consists of - * items that are in use, and cannot be freed. Cap this estimate at the - * low watermark. - */ - reclaimable = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B) + - global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE); - available += reclaimable - min(reclaimable / 2, wmark_low); + for_each_online_node(nid) { + si_meminfo_node(&i, nid); + available += si_mem_available_node(&i, nid); + } - if (available < 0) - available = 0; return available; } EXPORT_SYMBOL_GPL(si_mem_available);