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 0F1052D876B; Wed, 25 Feb 2026 05:01:14 +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=1771995674; cv=none; b=pZrYV3hX9kJJg4J/IXXOSzVMDedv0fy2GMuIQdqXQ4FpnMgJULXJuEmralFtFvwtkraYNOur/OHYbYvgZqk7Xu5FR/FitK6xcNKX76S0pVXoiFDadAY/TXEtpWjeqpfWrimUsAa1JZzqcSf+iGHIMFg76mkp/YE3iqPiLf4gzG8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771995674; c=relaxed/simple; bh=jUl6gnrkvDeq7jxlxPhGwDFU5y6TZIsFSFNiP3mvHJw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Kh+l6nP3+4LoOAmWQdn/d43U2l9FJ0B7GEJNqYgc9yU7ZXs3BwVJv7IYVnxvnUOz9B8KkSrqn8dMVvpgMTO2yX/tKQGkVMllG8xaEPk968N+bpdnp35DyksPU+/EWWXIWlmrLhN5SXOViA9NfpSYBtndr4DrsL3zaH1u4HE64t8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BnuI2kvq; 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="BnuI2kvq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C9239C2BCAF; Wed, 25 Feb 2026 05:01:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771995673; bh=jUl6gnrkvDeq7jxlxPhGwDFU5y6TZIsFSFNiP3mvHJw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BnuI2kvqDk68Fh80hgfXQfrUiD3IDeW7hwFMUzBkdO3VWhuRG9NAmgAjVcFo8iMIt 3KZnlHjFnPR+Dnqhc3L2FXbYK+l1RZgxmqnpoZaHEfieNk0x3VqNljApjWqz4bBMPA fQuzwta2uBRCSetd2IQux1W/gJJ+2tX9jRR53ZNbQQMZQAqYJtT2vmbMSAI2AB+Li0 DcqLsvp+Ru0GZZwfOscJDZeZ5ANR+ArNb5urQPNcdpP0ZGCPOfzuCJSchzzM2Rfu4K drexPtfbHzU0yMMtReGL4HhRWQqiGqXOOAMrNvZ6mufjHvGqX8pxGhyuXQBC2c5XbG e2aHV+KAQfp9Q== 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 19:00:38 -1000 Message-ID: <20260225050109.1070059-4-tj@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260225050109.1070059-1-tj@kernel.org> References: <20260225050109.1070059-1-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