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Mon, 21 Sep 2026 15:58:53 -0400 X-MC-Unique: ffI7HLfbO9WJQDXQmxn8XQ-1 X-Mimecast-MFC-AGG-ID: ffI7HLfbO9WJQDXQmxn8XQ_1790020728 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 9871C19352EA; Mon, 21 Sep 2026 19:58:45 +0000 (UTC) Received: from fedora (headnet03.pony-001.prod.iad2.dc.redhat.com [10.2.32.114]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with SMTP id B445F180036E; Mon, 21 Sep 2026 19:58:26 +0000 (UTC) Received: by fedora (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Mon, 21 Sep 2026 21:58:45 +0200 (CEST) Date: Mon, 21 Sep 2026 21:58:25 +0200 From: Oleg Nesterov To: Ye Liu Cc: Michal Hocko , Andrew Morton , Ye Liu , SJ Park , Gregory Price , Lorenzo Stoakes , peterz@infradead.org, paulmck@kernel.org, mingo@redhat.com, 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, 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, juri.lelli@redhat.com, vincent.guittot@linaro.org, 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: Re: [PATCH v4 02/15] mm/oom_kill: convert process/thread iterators to for_each_*_rculock Message-ID: References: <20260921092101.89285-1-ye.liu@linux.dev> <20260921092101.89285-3-ye.liu@linux.dev> MIME-Version: 1.0 In-Reply-To: <20260921092101.89285-3-ye.liu@linux.dev> X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: FEIWrZALs0rK76JUu0f98P2-fEhoDWMcECpiMpCdWPs_1790020728 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: AF785160004 X-Rspam-User: X-Stat-Signature: e9ywrioyg3emureremafpof5fs8gdeeu X-HE-Tag: 1790020735-407673 X-HE-Meta: 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 ZyGzz9E0 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 09/21, Ye Liu wrote: > > From: Ye Liu > > Replace the manual rcu_read_lock()/rcu_read_unlock() pairs wrapping > for_each_process()/for_each_thread() loops with for_each_process_rculock() > and for_each_thread_rculock(), which scope 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: Gregory Price (Meta) > Reviewed-by: Lorenzo Stoakes (ARM) > --- > mm/oom_kill.c | 20 +++++--------------- > 1 file changed, 5 insertions(+), 15 deletions(-) Reviewed-by: Oleg Nesterov