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 5E8AB33D517; Wed, 25 Feb 2026 05:01:56 +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=1771995716; cv=none; b=gTh435wLqXwOZEeDbe+3U2/S1+aokQkYkplgq5FN+/j1lQTdhIaFAPrHHnGWGihz7DYc3F8b0If+r/TYBmMFpgDdjahB9i0948XG4o80PSihA+y1wLhbGkW6kR/Gh1ssS7FnzaqV/v1AxFuoPbU/BS7cKRgXrC2+n0cclt4zf4g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771995716; c=relaxed/simple; bh=jUl6gnrkvDeq7jxlxPhGwDFU5y6TZIsFSFNiP3mvHJw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=skX+Lyj+onHrlf1S+P8aWEimRWEDomJCwdgyrcWLcF4KFIJ02nuxoYfqEwr5iKkytOTi/4kDjPjT8ICK7fVOfMpdq+O7iCwbB2ppa6NTc4/IPjAVlSEb/XdE1F1Qkyygm+lH6V9W8PwH4RFPHGGkntKk4/YdOHVVcJny/Z+GjxY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LGN8W4A0; 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="LGN8W4A0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DCBBDC116D0; Wed, 25 Feb 2026 05:01:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771995716; bh=jUl6gnrkvDeq7jxlxPhGwDFU5y6TZIsFSFNiP3mvHJw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LGN8W4A0+qkE0bDzyAN4vroj5IhykUf8WRZwfZYftf45cSiKoiSPoDcPyYc3r7TXS JYpFydmWS88OpS3XpFq1UVNWadodHL6N0I1d5LziEk2osmqQTx2VJhDhmOTOsCmluF VgXiQ58bSw3ZQ6pAO+iRlcS4LPO1llIe3DHf4OlXdn6zhQkEcE3gwMnSRfTqGX78jj JbWrsHFkk8FRmblU+/JUU5gANPaecZkhFU2QQL5kfno8yIhrZJb/mMHh7Lgd55PsqC GgCLJwSwnu9yd1ZFWH3Rx3gEPs5s5nkvuKl9zKlNhSCFmE9svO42x+b3PJkgLPZLHy l0RvYXHA1cBXQ== From: Tejun Heo To: linux-kernel@vger.kernel.org, sched-ext@lists.linux.dev Cc: void@manifault.com, arighi@nvidia.com, changwoo@igalia.com, emil@etsalapatis.com, hannes@cmpxchg.org, mkoutny@suse.com, cgroups@vger.kernel.org, Tejun Heo , Ingo Molnar , Peter Zijlstra Subject: [PATCH 03/34] sched/core: Swap the order between sched_post_fork() and cgroup_post_fork() Date: Tue, 24 Feb 2026 19:01:21 -1000 Message-ID: <20260225050152.1070601-4-tj@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260225050152.1070601-1-tj@kernel.org> References: <20260225050152.1070601-1-tj@kernel.org> Precedence: bulk X-Mailing-List: cgroups@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 Cc: Ingo Molnar Cc: Peter Zijlstra --- kernel/fork.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/kernel/fork.c b/kernel/fork.c index e832da9d15a4..eb839b207cd4 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2463,8 +2463,12 @@ __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); -- 2.53.0