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 29A56C43334 for ; Mon, 25 Jul 2022 15:34:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234742AbiGYPeh (ORCPT ); Mon, 25 Jul 2022 11:34:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49386 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232199AbiGYPec (ORCPT ); Mon, 25 Jul 2022 11:34:32 -0400 Received: from mail-qt1-x82b.google.com (mail-qt1-x82b.google.com [IPv6:2607:f8b0:4864:20::82b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 12A05BCB2 for ; Mon, 25 Jul 2022 08:34:31 -0700 (PDT) Received: by mail-qt1-x82b.google.com with SMTP id x11so8442202qts.13 for ; Mon, 25 Jul 2022 08:34:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cmpxchg-org.20210112.gappssmtp.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=67je02j6uPzSAKV5fALusQHcJaLZtd8UN7xVwkpfhMI=; b=cqYIXD8d4R3afensKf+99266lB8CnpoCR0cvyQJleALFFxfA893nPv3nDzZXt3p9za s8ObwE74BOHxU+40bwlVdDr3a0JISs43bgIQOwzuJcNzM0xST3u+iLxR8hwv1zNTXHS6 Grd3BJJSVOsa4373326OgtzSlvStT0S1VDd14qQS8J0boaE438X2O4r5roAtieEZRa6h SNNVP2akwjO8VpRxcok8o5upBwDLt09kWP3F6AcTwTqmdW5Me+jybiLbG/C3AXfnQHXy 6oThJosmja+RHL1pI0goIfSDiDz5HrJwrK5df6TJlo/cSxTG7pIONBV6cRi62GYTHyug bsxA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=67je02j6uPzSAKV5fALusQHcJaLZtd8UN7xVwkpfhMI=; b=4GeBJ13w18eJppNLGoLs7YlDw77QiAYLTMGQVGRT8xCLv0Jxhdob4CDe3HDmaLl4/3 yJ9SePbu+2iVd63juujYPapVwJtCD4BbZ6524OWUFtk0JKfvDCKs6w5OGtlCOY8iT7fI NSAnX2MnpZRNsG+JuJHHbsC/Y8pPuYTLg2oHmZR0Fpogb+FoW809J04TvUt4p20avkaQ t6z78IpzRirYf0B6QHwXUNewACrQ6vFgVXSRWzfL3bX8nV48o4CjtHg+IzzzpUWZ/rNI GxiGAR+fMLOQSJliTz2MzULq+oz11T4DzLXWmwOQn4DRdFvGVeOOBdT950sGsyRPOsTL sZZA== X-Gm-Message-State: AJIora8+xXuiRdZJdS2PsDSz1ZDniAxOZg1KYE6LdfsIJvDZzVzb+a5e f5+LtAMJxEkEkk1JuB5vJwJXEw== X-Google-Smtp-Source: AGRyM1vgqIkAXbToyHYJQiompUrodEA+PwnkTXUl3kHFv5+9uA0m41T7e88PjoGYpUJEUXXNPNijFg== X-Received: by 2002:ac8:5ac2:0:b0:31f:d13:de85 with SMTP id d2-20020ac85ac2000000b0031f0d13de85mr10923232qtd.397.1658763270030; Mon, 25 Jul 2022 08:34:30 -0700 (PDT) Received: from localhost ([2620:10d:c091:480::1:994f]) by smtp.gmail.com with ESMTPSA id q3-20020a05622a030300b0031eb393aa45sm7783893qtw.40.2022.07.25.08.34.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Jul 2022 08:34:29 -0700 (PDT) Date: Mon, 25 Jul 2022 11:34:28 -0400 From: Johannes Weiner To: Chengming Zhou Cc: surenb@google.com, mingo@redhat.com, peterz@infradead.org, tj@kernel.org, corbet@lwn.net, akpm@linux-foundation.org, rdunlap@infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, songmuchun@bytedance.com, cgroups@vger.kernel.org Subject: Re: [PATCH 1/9] sched/psi: fix periodic aggregation shut off Message-ID: References: <20220721040439.2651-1-zhouchengming@bytedance.com> <20220721040439.2651-2-zhouchengming@bytedance.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220721040439.2651-2-zhouchengming@bytedance.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 21, 2022 at 12:04:31PM +0800, Chengming Zhou wrote: > We don't want to wake periodic aggregation work back up if the > task change is the aggregation worker itself going to sleep, or > we'll ping-pong forever. > > Previously, we would use psi_task_change() in psi_dequeue() when > task going to sleep, so this check was put in psi_task_change(). > > But commit 4117cebf1a9f ("psi: Optimize task switch inside shared cgroups") > defer task sleep handling to psi_task_switch(), won't go through > psi_task_change() anymore. > > So this patch move this check to psi_task_switch(). Note for defer sleep > case, we should wake periodic avgs work for common ancestors groups, > since those groups have next task sched_in. > > Fixes: 4117cebf1a9f ("psi: Optimize task switch inside shared cgroups") > Signed-off-by: Chengming Zhou Good catch! Acked-by: Johannes Weiner