From patchwork Thu Nov 17 08:26:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yicong Yang X-Patchwork-Id: 13046284 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 74D89C4167D for ; Thu, 17 Nov 2022 08:27:51 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D40D56B0073; Thu, 17 Nov 2022 03:27:50 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id CCA406B0078; Thu, 17 Nov 2022 03:27:50 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AEAB76B0075; Thu, 17 Nov 2022 03:27:50 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id A18406B0073 for ; Thu, 17 Nov 2022 03:27:50 -0500 (EST) Received: from smtpin11.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 74E101202AE for ; Thu, 17 Nov 2022 08:27:50 +0000 (UTC) X-FDA: 80142255900.11.5B5494E Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by imf19.hostedemail.com (Postfix) with ESMTP id 4EE051A000B for ; Thu, 17 Nov 2022 08:27:48 +0000 (UTC) Received: from canpemm500009.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4NCY1W70vLzHvtj; Thu, 17 Nov 2022 16:27:11 +0800 (CST) Received: from localhost.localdomain (10.67.164.66) by canpemm500009.china.huawei.com (7.192.105.203) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Thu, 17 Nov 2022 16:27:43 +0800 From: Yicong Yang To: , , , , , , , CC: , , , , , , , , , , , , , , , , , Barry Song <21cnbao@gmail.com>, , , , Anshuman Khandual , Barry Song Subject: [PATCH v7 1/2] mm/tlbbatch: Introduce arch_tlbbatch_should_defer() Date: Thu, 17 Nov 2022 16:26:47 +0800 Message-ID: <20221117082648.47526-2-yangyicong@huawei.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20221117082648.47526-1-yangyicong@huawei.com> References: <20221117082648.47526-1-yangyicong@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.67.164.66] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To canpemm500009.china.huawei.com (7.192.105.203) X-CFilter-Loop: Reflected ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1668673670; 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-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=bCYqSXjP9q6Ubeo7SB2Bf4FSld/O4MYQf/xJXhzChYA=; b=rt35S1tZ3H/6H2hbGWTU7F8H0TOf2kEj2ILqWiAuPQa1sMaklosGvfO2MrpsMOk8BKc5ER Gkj5tdxundLo7JLqO96aSnaPb9YmnxDn/4KIsrnfjXRkFRGu7Y10UFGdrAIz8cFLsFbr1p FD4bpA0ZtPRGBnusdjk4YPxi3AiSuTM= ARC-Authentication-Results: i=1; imf19.hostedemail.com; dkim=none; spf=pass (imf19.hostedemail.com: domain of yangyicong@huawei.com designates 45.249.212.188 as permitted sender) smtp.mailfrom=yangyicong@huawei.com; dmarc=pass (policy=quarantine) header.from=huawei.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1668673670; a=rsa-sha256; cv=none; b=iIycKja2AQ+xfDAdUy+maETB4B8PLzV52s+46kQSbfWKTafzkkAmA1AzBaE/gHW0fp9QZA aA/bSoKUjmHUMpB19b3o5FzalniUz1GPQ/Gk/dSuAUYNDFnoSpPQhBa7R39aFsIAgWAA99 yqyXh42cfTkXk/57VaSLIbw4oZqvYfM= X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 4EE051A000B Authentication-Results: imf19.hostedemail.com; dkim=none; spf=pass (imf19.hostedemail.com: domain of yangyicong@huawei.com designates 45.249.212.188 as permitted sender) smtp.mailfrom=yangyicong@huawei.com; dmarc=pass (policy=quarantine) header.from=huawei.com X-Stat-Signature: 9tygzjb5cj5poeai1xtcdfg1gnbrmgqm X-HE-Tag: 1668673668-647353 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: From: Anshuman Khandual The entire scheme of deferred TLB flush in reclaim path rests on the fact that the cost to refill TLB entries is less than flushing out individual entries by sending IPI to remote CPUs. But architecture can have different ways to evaluate that. Hence apart from checking TTU_BATCH_FLUSH in the TTU flags, rest of the decision should be architecture specific. Signed-off-by: Anshuman Khandual [https://lore.kernel.org/linuxppc-dev/20171101101735.2318-2-khandual@linux.vnet.ibm.com/] Signed-off-by: Yicong Yang [Rebase and fix incorrect return value type] Reviewed-by: Kefeng Wang Reviewed-by: Anshuman Khandual Reviewed-by: Barry Song Reviewed-by: Xin Hao Tested-by: Punit Agrawal --- arch/x86/include/asm/tlbflush.h | 12 ++++++++++++ mm/rmap.c | 9 +-------- 2 files changed, 13 insertions(+), 8 deletions(-) diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h index cda3118f3b27..8a497d902c16 100644 --- a/arch/x86/include/asm/tlbflush.h +++ b/arch/x86/include/asm/tlbflush.h @@ -240,6 +240,18 @@ static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long a) flush_tlb_mm_range(vma->vm_mm, a, a + PAGE_SIZE, PAGE_SHIFT, false); } +static inline bool arch_tlbbatch_should_defer(struct mm_struct *mm) +{ + bool should_defer = false; + + /* If remote CPUs need to be flushed then defer batch the flush */ + if (cpumask_any_but(mm_cpumask(mm), get_cpu()) < nr_cpu_ids) + should_defer = true; + put_cpu(); + + return should_defer; +} + static inline u64 inc_mm_tlb_gen(struct mm_struct *mm) { /* diff --git a/mm/rmap.c b/mm/rmap.c index 2ec925e5fa6a..a9ab10bc0144 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -685,17 +685,10 @@ static void set_tlb_ubc_flush_pending(struct mm_struct *mm, bool writable) */ static bool should_defer_flush(struct mm_struct *mm, enum ttu_flags flags) { - bool should_defer = false; - if (!(flags & TTU_BATCH_FLUSH)) return false; - /* If remote CPUs need to be flushed then defer batch the flush */ - if (cpumask_any_but(mm_cpumask(mm), get_cpu()) < nr_cpu_ids) - should_defer = true; - put_cpu(); - - return should_defer; + return arch_tlbbatch_should_defer(mm); } /*