From: Will Deacon Subject: [PATCH 0/2] Fix broken cpuset affinity handling on heterogeneous systems Date: Tue, 31 Jan 2023 22:17:17 +0000 Message-ID: <20230131221719.3176-1-will@kernel.org> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1675203444; bh=PJSvYLHcRpS9dbzIMih0FP+oXT/wdW6kY7rfhEtLzKA=; h=From:To:Cc:Subject:Date:From; b=Ygi679fQSEyO7ZcNdesDQOCNvrDlqqi9yDKz0+2k+46LCplrJWbu3qpXPqlXlDrJG QY8NBhs15zL+jPwDO0nUDIOp+boS9DL3iHtCvLm7tMJhdw90KfyR/OJVb/HPVsrGtU 8Ple7yv1+7V3P84CupQNlbh4jk5O+fFai9HoF0qEUQaaG0e94OfCG9D5GxC9d4SIGu lxHe3tEjzeARnmfifNmlcwkk7chXl4elUZsJg25f9dmss5Ec/GM7zWMdwjQaTM7LxJ ORI4ojxwz/tDR6G3fmco+u6Nf+tOIZ9mLTlzAnjoRVSwU/SzfAnJ5aK7vzthufb2A8 F/6OV29psiVEQ== List-ID: Content-Type: text/plain; charset="us-ascii" To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: kernel-team-z5hGa2qSFaRBDgjK7y7TUQ@public.gmane.org, Will Deacon , Peter Zijlstra , Waiman Long , Zefan Li , Tejun Heo , Johannes Weiner , cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Hi folks, These two patches fix a couple of CPU affinity issues involving cpusets on heterogeneous systems. A concrete example of this is running 32-bit tasks on recent arm64 SoCs, where some of the cores are only capable of 64-bit execution. The first patch (from Peter) fixes a regression introduced during the recent merge window which is causing test failures in Android where the problematic patches have been backported. The second patch fixes a longer-standing issue, which I noticed while testing fixes for the initial regression. Ideally, both of these would land together, but fixing the regression for 6.2 is my main concern. Anyway, I don't think either Peter or I would call ourselves cpuset experts (far from it!), so please have a look. Cheers, Will Cc: Peter Zijlstra Cc: Waiman Long Cc: Zefan Li Cc: Tejun Heo Cc: Johannes Weiner Cc: cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org --->8 Peter Zijlstra (1): cpuset: Fix cpuset_cpus_allowed() to not filter offline CPUs Will Deacon (1): cpuset: Call set_cpus_allowed_ptr() with appropriate mask for task kernel/cgroup/cpuset.c | 57 +++++++++++++++++++++++++++++++++--------- 1 file changed, 45 insertions(+), 12 deletions(-) -- 2.39.1.456.gfc5497dd1b-goog