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Fri, 11 Sep 2026 08:01:17 +0000 X-Mizu-Trace-ID: e4dd3759505df11b 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 , paulmck@kernel.org, rostedt@goodmis.org, jpoimboe@kernel.org, mic@digikod.net, tglx@kernel.org, akpm@linux-foundation.org, david@kernel.org, linmiaohe@huawei.com, nao.horiguchi@gmail.com, rafael@kernel.org, gnoack3000@gmail.com, gourry@gourry.net, 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, 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 Subject: [PATCH v3 10/15] sched: convert process/thread iterators to for_each_*_rculock Date: Fri, 11 Sep 2026 15:57:55 +0800 Message-Id: <20260911075800.491472-11-ye.liu@linux.dev> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260911075800.491472-1-ye.liu@linux.dev> References: <20260911075800.491472-1-ye.liu@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 90008180006 X-Stat-Signature: rykqqspwnphz5g135ijprodu8rwf3o9d X-Rspam-User: X-HE-Tag: 1789113681-805199 X-HE-Meta: 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 Zrf6RENG 5bV8ZA4ylRGSgksikxMUvkAvVUSRUQWSH0eXqkhAiAtE6WlWsC7m9EqTdya7d2YlwkUXb8umlTEpEurGMcFcS2G9Lwy7a4antg+Mw0CFF8EGpX0F8yrOoDayVBljSmzsASQ7ezfPfQ6QLWNUD9wXea7qmo5pW37j2j61SngIfMi9ioHqf49kzrEDokdFaKrBKZ24F5OYB7QrPq4GCc5P6jVncv3nvHYken59pKRyYEcHptkxBTsWzJrnvmsqPltWa4HFMNapEWEEQzufSeLS1GkdpBrTUR2Ura23PAR6VOTRqIHTPG71IV5qvBEZxBz3dAsxjtNVuOBokH9BTtZBRkyVtjnmg8c75BFxBg5SCuIs+bdi+GEjxk5k6zs0HAz10bHA+KYAK0Iz6kRt+VJCUGgGkW3RbvgZF6CbK/VJE7nqJFuDC7aae/jlBLihVjfiX94rPNB+mM78ozDw= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 --- Changes in v3: - Split from kernel/ patch in v2 (Peter Zijlstra, Steven Rostedt) Changes in v2: - Rename *_rcu to *_rculock 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