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 B2901C61DA4 for ; Wed, 15 Mar 2023 19:26:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232269AbjCOT0M (ORCPT ); Wed, 15 Mar 2023 15:26:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44224 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232860AbjCOTZx (ORCPT ); Wed, 15 Mar 2023 15:25:53 -0400 Received: from mail-wr1-x435.google.com (mail-wr1-x435.google.com [IPv6:2a00:1450:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8A19029424 for ; Wed, 15 Mar 2023 12:25:48 -0700 (PDT) Received: by mail-wr1-x435.google.com with SMTP id q16so18304547wrw.2 for ; Wed, 15 Mar 2023 12:25:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=layalina-io.20210112.gappssmtp.com; s=20210112; t=1678908347; 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=zDY1niEs3y45VnBldMysocOzffvLzvPaTI8pzH+DNnY=; b=oTI0TkVK0nNqU/zoKTrAJNGzJsgn3Ec3xL6T/YTI/OGOYUwiXI+Zea7W9JQ37PN9mK Fri6RhTmi800wCaByug5NppNgFk3745pN3yCoAJbr9MVc5doFqgVAye9nBAB8Tjq2yFT ikfxJfmqWJyBZtZjurB6GVbT4S50M7mLzR6f/IVy6nuQHLL+EkYjtwjPRLF7LIy7EU6b ehnzJCmvkIv4w1SifZk28nmcRa/qfYHSJl8bRG7IzM2S9Qxx0PCN5ipkC2vY4TUHWRlm 1S/NnH0cBrf95jL1XpbM+hJ+t9gnX1p8zdtqBbmsos9x+wXJxB7ajX2m7v6y7CWhXGl3 aBrg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678908347; 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=zDY1niEs3y45VnBldMysocOzffvLzvPaTI8pzH+DNnY=; b=7FYG6Umy/sH7pO1Lbuz52pMz9Gttd0AwUZvO3JR61OY2PP+u1sMDd017z74tQChOKz KBOvcKYi3GDxBbQcGYe9CG+NPXV3GYt0Rzhao6JsIIeO1/XooQH46kVxYLUrKo1B5l/C XvRov01MizMlu+k7QJ0XxcgLo29yNflutATknYb+7bZw51nBbpHQFTp+oJmkS318fnXl 0osgNLERDBehq+qGKGDOjITQYQOw1rEErUBdPiioF1BkNHeJtF5mF6vqCjPCsFOMEE13 o0vRTIDhRED8K/aUjgBEeQseW+rdFzg1D92c6vMDHwDXzJyqr3VHO4VzkidFpI1mx5DL 5Bog== X-Gm-Message-State: AO0yUKWPmnOCaFsuqE61n4XhYj45ipYvUDa/8wc4qFA6AssjWnwg5amY nxskfGKWDk7iReySeTDZskrPEw== X-Google-Smtp-Source: AK7set/KaTIW+foFs+KH/RgvtwrBd+LkAfDADlz+KDrIV4s7o1Y69ktq9GFXEGM+tXyOBFlNdysWWA== X-Received: by 2002:adf:dfd0:0:b0:2ce:a703:1937 with SMTP id q16-20020adfdfd0000000b002cea7031937mr2774138wrn.50.1678908347081; Wed, 15 Mar 2023 12:25:47 -0700 (PDT) Received: from airbuntu (host86-168-251-3.range86-168.btcentralplus.com. [86.168.251.3]) by smtp.gmail.com with ESMTPSA id m1-20020adffa01000000b002c5526234d2sm5557773wrr.8.2023.03.15.12.25.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Mar 2023 12:25:46 -0700 (PDT) Date: Wed, 15 Mar 2023 19:25:44 +0000 From: Qais Yousef To: Juri Lelli Cc: Peter Zijlstra , Ingo Molnar , Waiman Long , 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 Subject: Re: [RFC PATCH 2/3] sched/cpuset: Keep track of SCHED_DEADLINE tasks in cpusets Message-ID: <20230315192544.44ufekpbebs2ysub@airbuntu> References: <20230315121812.206079-1-juri.lelli@redhat.com> <20230315121812.206079-3-juri.lelli@redhat.com> <20230315144927.624cbwc3yep3fwor@airbuntu> 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 03/15/23 17:18, Juri Lelli wrote: > On 15/03/23 14:49, Qais Yousef wrote: > > On 03/15/23 12:18, Juri Lelli wrote: > > ... > > > > +void inc_dl_tasks_cs(struct task_struct *p) > > > +{ > > > + struct cpuset *cs = task_cs(p); > > > > nit: > > > > I *think* task_cs() assumes rcu_read_lock() is held, right? > > > > Would it make sense to WARN_ON(!rcu_read_lock_held()) to at least > > annotate the deps? > > Think we have that check in task_css_set_check()? Yes you're right, I didn't go forward enough in the call stack. It seems to depend on PROVE_RCU, which sounds irrelevant, but I see PROVE_RCU is actually an alias for PROVE_LOCKING. Cheers -- Qais Yousef