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 3A177C77B61 for ; Fri, 28 Apr 2023 11:22:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231665AbjD1LWZ (ORCPT ); Fri, 28 Apr 2023 07:22:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52482 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230435AbjD1LWV (ORCPT ); Fri, 28 Apr 2023 07:22:21 -0400 Received: from mail-wm1-x32c.google.com (mail-wm1-x32c.google.com [IPv6:2a00:1450:4864:20::32c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9A21F30C2 for ; Fri, 28 Apr 2023 04:22:19 -0700 (PDT) Received: by mail-wm1-x32c.google.com with SMTP id 5b1f17b1804b1-3f09b4a156eso66059295e9.3 for ; Fri, 28 Apr 2023 04:22:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=layalina-io.20221208.gappssmtp.com; s=20221208; t=1682680938; x=1685272938; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=zJgSTzgu9YtliSGCYghLe0j5dXYcDcHesNq23aEuzOY=; b=JzUGb2nbnQdOEy+fCVy1d07ZMcLNqZcFnocE+qzql7z90iPjdixMT6M4TPzfRwLFwj 4Fyqm5ke4Jk8pGzUBoA5KlH9jafEccsaekRgtzViTM8/v2fjj2ApEQdz0kOjx29YDiFf VLQFJu4z1dN2zyik04Hg5s5rYgl7Q2py/yW3yrB2An+MNwFmz6rRK0LC/m+muXZBxBck xlCbtJD8HiKGpWHCsnKdpYlZuoVefRHQlGQn520OE7NmX0OI+tCyNnVXEkd8Mprves0v hfqJFT3y6RAyCMsuSrDEyPsP3zaFQ9TEPG8pJ62+oQZ3ZdwcYS4dKrTunmcRkgPWlFu0 FlTA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682680938; x=1685272938; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=zJgSTzgu9YtliSGCYghLe0j5dXYcDcHesNq23aEuzOY=; b=J6EOPqzRQiIq5Ah6GLy6K+ZWErJtAAOHbrlV78o0Tac8C7/HIAdqdma5rm8MhJxH7K vbSnApnjR18kzVGKLso5hAgn2xlkcaW1VFOZk74BpJU9cKxYmMP8Vchxc0QA42YGlrKh Ud6NkBAX326RtmZjHNWv3ONI7Hldy/d8za6hCfkAbYcTwbYWwDHQs6XugAi5Tha+TWk9 5XrzBHy93Yy3Es11o7F9YBlRdhP+iYMRzxs9oapu+CSijDiksNb4aBjZA3bqLLble5tX QEB/bTR1q1LY2+EZLLMvdTIwNLZfTOnCpFQuYWQU8Fgx1+Codt5ITl3ROYQ+mq6XS9Yp +0xA== X-Gm-Message-State: AC+VfDwD/ock03IGsAIA3u7b5gCL/yAXv/OqwxhoSn7SDSqamf+jWiph 8cdz+GIY6nDyYA0GUpiSSrxD4Q== X-Google-Smtp-Source: ACHHUZ46FKfHw7Wbog8Bl1L81IHin1MlXlUbC8ahQWZEJ0IXJgskxA8IQzIeuUmU0e33kSivR5zKWA== X-Received: by 2002:a5d:56c6:0:b0:2ee:da1c:381a with SMTP id m6-20020a5d56c6000000b002eeda1c381amr3549607wrw.69.1682680938097; Fri, 28 Apr 2023 04:22:18 -0700 (PDT) Received: from airbuntu ([104.132.45.110]) by smtp.gmail.com with ESMTPSA id m2-20020a056000008200b002f53fa16239sm20851726wrx.103.2023.04.28.04.22.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Apr 2023 04:22:17 -0700 (PDT) Date: Fri, 28 Apr 2023 12:22:16 +0100 From: Qais Yousef To: Juri Lelli Cc: Xuewen Yan , Waiman Long , Peter Zijlstra , Ingo Molnar , Tejun Heo , Zefan Li , Johannes Weiner , Hao Luo , Dietmar Eggemann , Steven Rostedt , linux-kernel@vger.kernel.org, luca.abeni@santannapisa.it, claudio@evidence.eu.com, tommaso.cucinotta@santannapisa.it, bristot@redhat.com, mathieu.poirier@linaro.org, cgroups@vger.kernel.org, Vincent Guittot , Wei Wang , Rick Yiu , Quentin Perret , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Sudeep Holla , =?utf-8?B?546L56eRIChLZSBXYW5nKQ==?= , zhiguo.niu@uniissoc.com Subject: Re: [PATCH 2/6] sched/cpuset: Bring back cpuset_mutex Message-ID: <20230428112216.cftofdixwbl4hufm@airbuntu> References: <20230329125558.255239-1-juri.lelli@redhat.com> <20230329125558.255239-3-juri.lelli@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/27/23 07:53, Juri Lelli wrote: > Hi, > > On 27/04/23 10:58, Xuewen Yan wrote: > > HI Juri, > > > > Would this patch be merged tobe stable-rc? In kernel5.15, we also find > > that the rwsem would be blocked for a long time, when we change the > > task's cpuset cgroup. > > And when we revert to the mutex, the delay would disappear. > > Honestly, I'm not sure. This change is mostly improving performance, but > it is also true that it's fixing some priority inheritance corner cases. > So, I'm not sure it qualifies for stable, but it would be probably good to > have it there. I'm under the impression we need the whole lot back to stable, no? I'm not sure if we can decouple this patch from the rest. FWIW, I did my testing on 5.15 - so we can definitely help with the backport and testing for 5.15 and 5.10. Thanks! -- Qais Yousef