From mboxrd@z Thu Jan 1 00:00:00 1970 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B5131C3A5A7 for ; Tue, 6 Dec 2022 17:20:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232733AbiLFRUx (ORCPT ); Tue, 6 Dec 2022 12:20:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234959AbiLFRUn (ORCPT ); Tue, 6 Dec 2022 12:20:43 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1312932B97 for ; Tue, 6 Dec 2022 09:19:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1670347186; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=AOGSNl4F+a3U3QMjdXFvMaoAelsGXf+7OuteK4kgbOQ=; b=apmSbAnuaIRWRpASA6QfIAM7ldu1LizDoN0a6DdmAymU4cyL+T9919zH6ogNmc5LuOozp/ 1LqzIHBjjB7FhiIB1vMgUcTMbBLEraPBzfvY3QQFNH7xcK88VYnHAEhNMuncZAtebXrtEL lE2d3h+hU4s/T0JsR9PKNfIVMOcNpZk= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-77-72YglCZgPLy4WsvxS_4UwQ-1; Tue, 06 Dec 2022 12:19:43 -0500 X-MC-Unique: 72YglCZgPLy4WsvxS_4UwQ-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 0959D886469; Tue, 6 Dec 2022 17:19:42 +0000 (UTC) Received: from tpad.localdomain (ovpn-112-2.gru2.redhat.com [10.97.112.2]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 7885149BB60; Tue, 6 Dec 2022 17:19:41 +0000 (UTC) Received: by tpad.localdomain (Postfix, from userid 1000) id C26B1409005D6; Tue, 6 Dec 2022 13:31:40 -0300 (-03) Message-ID: <20221206162416.404740300@redhat.com> User-Agent: quilt/0.66 Date: Tue, 06 Dec 2022 13:18:27 -0300 From: Marcelo Tosatti To: atomlin@redhat.com, frederic@kernel.org Cc: cl@linux.com, tglx@linutronix.de, mingo@kernel.org, peterz@infradead.org, pauld@redhat.com, neelx@redhat.com, oleksandr@natalenko.name, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v9 1/5] mm/vmstat: Add CPU-specific variable to track a vmstat discrepancy References: <20221206161826.698593151@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Aaron Tomlin Introduce a CPU-specific variable namely vmstat_dirty to indicate if a vmstat imbalance is present for a given CPU. Therefore, at the appropriate time, we can fold all the remaining differentials. This patch also provides trivial helpers for modification and testing. Signed-off-by: Aaron Tomlin --- mm/vmstat.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) Index: linux-2.6/mm/vmstat.c =================================================================== --- linux-2.6.orig/mm/vmstat.c +++ linux-2.6/mm/vmstat.c @@ -194,6 +194,22 @@ void fold_vm_numa_events(void) #endif #ifdef CONFIG_SMP +static DEFINE_PER_CPU_ALIGNED(bool, vmstat_dirty); + +static inline void vmstat_mark_dirty(void) +{ + this_cpu_write(vmstat_dirty, true); +} + +static inline void vmstat_clear_dirty(void) +{ + this_cpu_write(vmstat_dirty, false); +} + +static inline bool is_vmstat_dirty(void) +{ + return this_cpu_read(vmstat_dirty); +} int calculate_pressure_threshold(struct zone *zone) {