From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DEC562701BB; Sat, 20 Sep 2025 00:59:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758329993; cv=none; b=im5cL2SOFV9U3tJV8YkaHmSkQG1EWX5SS1mEmAZaQOl1RNuqfstqyNGuI5JfzhFMb/SQAJtMyyo++R5QRegu06t3evh8TVBWR9L/DEFJC4KH9XdqiKP4raakncUP3iZs1588UOod6J+m/U8AOD8p3vch2/ylgKxBfF5Zs/JnHSs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758329993; c=relaxed/simple; bh=GtkAshaK54WAcSfNOFJ8SQsdT9SQP7Sgd0hlLccLHfk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Iik1KOC/UXvuvrc4ZTIwA9CPmCz9btO6gW3HHGbTblko6tZroW3PkplbG1EJK4dCcgYLBkkeHQop8S5XnlZvefC/DxoF5YlU+f5aeGeOxYUye+2/0rgfyNX0QGRcKru2OF11kDjf+PkdcsokOl1nNqpnSaWqxtPMCtgEs8aIDgk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FNx6aZOR; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FNx6aZOR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A0E2EC4CEF5; Sat, 20 Sep 2025 00:59:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1758329992; bh=GtkAshaK54WAcSfNOFJ8SQsdT9SQP7Sgd0hlLccLHfk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FNx6aZORRXa4wHvGpR2XIqPG2iRmhCWWGlHDcA9DN1pJXQEfLLATq/N7hux/k2Fd7 PlmX338RRgNv/H/0efJgyN2t4mDdmovw6rLGvauUApdXUYBE4vPQ/T1jsC/jLrt35R hrLuasVMKzBrscSEfHmvJZ4GZ9qs0PCW5JPnHFcHPX/ukb1shYsan0M47D1nGI4KSv ahBelUdimQGLrK6fSRcbOqIlgbhffXZZr6vX2BHWFlJIwLTuLk3jDo/sCWNWJD1Pr5 /JWc+t6Xqk0JOSSTDujszpZlOcXcgWWKzOe9zjGfjOrfXoAaN8m0GVAG/l5YnU72Hg mynPMpYbx9yuQ== From: Tejun Heo To: void@manifault.com, arighi@nvidia.com, multics69@gmail.com Cc: linux-kernel@vger.kernel.org, sched-ext@lists.linux.dev, memxor@gmail.com, bpf@vger.kernel.org, Tejun Heo Subject: [PATCH 18/46] sched/core: Swap the order between sched_post_fork() and cgroup_post_fork() Date: Fri, 19 Sep 2025 14:58:41 -1000 Message-ID: <20250920005931.2753828-19-tj@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250920005931.2753828-1-tj@kernel.org> References: <20250920005931.2753828-1-tj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The planned sched_ext cgroup sub-scheduler support needs the newly forked task to be associated with its cgroup in its post_fork() hook. There is no existing ordering requirement between the two now. Swap them and note the new ordering requirement. Signed-off-by: Tejun Heo --- kernel/fork.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/kernel/fork.c b/kernel/fork.c index af673856499d..6e5a1397d2e6 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2415,8 +2415,12 @@ __latent_entropy struct task_struct *copy_process( fd_install(pidfd, pidfile); proc_fork_connector(p); - sched_post_fork(p); + /* + * sched_ext needs @p to be associated with its cgroup in its post_fork + * hook. cgroup_post_fork() should come before sched_post_fork(). + */ cgroup_post_fork(p, args); + sched_post_fork(p); perf_event_fork(p); trace_task_newtask(p, clone_flags); -- 2.51.0