From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta1.migadu.com (out-156.mta1.migadu.com [95.215.58.156]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C1A054582C8 for ; Mon, 21 Sep 2026 09:23:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.156 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789982636; cv=none; b=eiifr3Sveqr3WYjfDnVNw893uLvF6+saTpaSZahRsfM8utEubNbPhEKApKXuyFznqT3Es/P/nRYwBvn6ozsbKV9F4N3rS4rSVc1wacnukKcHpkLffII105HYnqJSGyS3pO77QQg0CUauEmgyVsGvuuvLJxPwHffLCpr6wzbLXs0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789982636; c=relaxed/simple; bh=JmZnNdNWu/MHbh4iVosFA0RR44Xc7VFrViTR+zioOBM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=WM1kkJNaKZgzgx/mqXZFAiJhq/pMZCApPanUXrJrBSvJ7M9HSrwBg1Lwfx/aahAvJruMZoP0e9vOKsG9ML7xqQI0USLPzDjSw07ai66+n/OYeyub6RMj/cHCGMwvYP+HvnCCyzTzodiWTqBwU7jIncyEMFdoryAAuQfeU3y9wbE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=Nd2YedFb; arc=none smtp.client-ip=95.215.58.156 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="Nd2YedFb" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=JmZnNdNWu/MHbh4iVosFA0RR44Xc7VFrViTR+zioOBM=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789982631; v=1; x=1790587431; b=Nd2YedFbPQlJZwOFSjV7Uav1emqVZ361evkMut/lCudxWrcDlALOhoLCj/G9YtZy8wXGtJmt RklNHbnUJowDBnTNpW+U4G5DdDrXXHXJJFKymF7cG9OY1nL4YNV2guE9JjCa4pv5UGBn1preh2d 7erhcnbj+J4ll2DhHx9lRuG8= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 24a1d58a18ab436c; Mon, 21 Sep 2026 09:23:51 +0000 X-Mizu-Trace-ID: 24a1d58a18ab436c X-Migadu-Flow: FLOW_OUT From: Ye Liu To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot Cc: Ye Liu , Michal Hocko , SJ Park , Lorenzo Stoakes , Oleg Nesterov , akpm@linux-foundation.org, paulmck@kernel.org, rostedt@goodmis.org, jpoimboe@kernel.org, mic@digikod.net, tglx@kernel.org, david@kernel.org, linmiaohe@huawei.com, nao.horiguchi@gmail.com, rafael@kernel.org, gnoack3000@gmail.com, gourry@gourry.net, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, rcu@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org, rientjes@google.com, shakeel.butt@linux.dev, xu.xin16@zte.com.cn, chengming.zhou@linux.dev, will@kernel.org, boqun@kernel.org, frederic@kernel.org, neeraj.upadhyay@kernel.org, joelagnelf@nvidia.com, josh@joshtriplett.org, urezki@gmail.com, tony.luck@intel.com, reinette.chatre@intel.com, x86@kernel.org, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, pavel@kernel.org, lance.yang@linux.dev, mhiramat@kernel.org, pmladek@suse.com, longman@redhat.com, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, qiang.zhang@linux.dev, dietmar.eggemann@arm.com, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, kprateek.nayak@amd.com, mark.rutland@arm.com, Dave.Martin@arm.com, james.morse@arm.com, babu.moger@amd.com Subject: [PATCH v4 10/15] sched: convert process/thread iterators to for_each_*_rculock Date: Mon, 21 Sep 2026 17:20:56 +0800 Message-Id: <20260921092101.89285-11-ye.liu@linux.dev> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260921092101.89285-1-ye.liu@linux.dev> References: <20260921092101.89285-1-ye.liu@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Ye Liu Replace the manual rcu_read_lock()/rcu_read_unlock() and guard(rcu) pairs combined with for_each_process_thread() loops in kernel/sched/ with for_each_process_thread_rculock(), which scopes the RCU read lock to the loop body via scoped_guard(rcu). No functional change. Signed-off-by: Ye Liu Acked-by: Michal Hocko Reviewed-by: SJ Park Reviewed-by: Lorenzo Stoakes (ARM) Reviewed-by: Oleg Nesterov --- kernel/sched/core.c | 3 +-- kernel/sched/debug.c | 4 +--- 2 files changed, 2 insertions(+), 5 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 0697ed0f1c3d..fd5bdd2cb798 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2005,8 +2005,7 @@ static void uclamp_sync_util_min_rt_default(void) smp_mb__after_spinlock(); read_unlock(&tasklist_lock); - guard(rcu)(); - for_each_process_thread(g, p) + for_each_process_thread_rculock(g, p) uclamp_update_util_min_rt_default(p); } diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index 72236db67983..cdae165b98f7 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -1029,14 +1029,12 @@ static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) #endif "\n"); - rcu_read_lock(); - for_each_process_thread(g, p) { + for_each_process_thread_rculock(g, p) { if (task_cpu(p) != rq_cpu) continue; print_task(m, rq, p); } - rcu_read_unlock(); } void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) -- 2.25.1