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From: Shakeel Butt To: Frederic Weisbecker Cc: LKML , Andrew Morton , Ingo Molnar , Johannes Weiner , Marco Crivellari , Michal Hocko , Michal Hocko , Muchun Song , Peter Zijlstra , Roman Gushchin , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , cgroups@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 16/27] sched/isolation: Flush memcg workqueues on cpuset isolated partition change Message-ID: References: <20250620152308.27492-1-frederic@kernel.org> <20250620152308.27492-17-frederic@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250620152308.27492-17-frederic@kernel.org> X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam03 X-Stat-Signature: 5yr831twb5j5t18ntn9gt3rc6jw48coq X-Rspam-User: X-Rspamd-Queue-Id: D7304C0008 X-HE-Tag: 1750447812-27663 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Jun 20, 2025 at 05:22:57PM +0200, Frederic Weisbecker wrote: > The HK_TYPE_DOMAIN housekeeping cpumask is now modifyable at runtime. In > order to synchronize against memcg workqueue to make sure that no > asynchronous draining is still pending or executing on a newly made > isolated CPU, the housekeeping susbsystem must flush the memcg > workqueues. > > However the memcg workqueues can't be flushed easily since they are > queued to the main per-CPU workqueue pool. > > Solve this with creating a memcg specific pool and provide and use the > appropriate flushing API. > > Signed-off-by: Frederic Weisbecker Acked-by: Shakeel Butt