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Mon, 07 Sep 2026 23:25:33 +0000 X-Mizu-Trace-ID: 096a1c17d24f69cc X-Migadu-Flow: FLOW_OUT Date: Mon, 7 Sep 2026 16:25:31 -0700 From: Shakeel Butt To: Joshua Hahn Cc: hannes@cmpxchg.org, mhocko@kernel.org, roman.gushchin@linux.dev, muchun.song@linux.dev, akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, dev@lankhorst.se, mripard@kernel.org, nat@pixelcluster.dev, tj@kernel.org, mkoutny@suse.com, osalvador@suse.de, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, kernel-team@meta.com Subject: Re: [PATCH v5 5/7] mm/page_counter: introduce an asynchronous drainer Message-ID: References: <20260831163752.2193337-1-joshua.hahnjy@gmail.com> <20260831163752.2193337-6-joshua.hahnjy@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260831163752.2193337-6-joshua.hahnjy@gmail.com> X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: A5433140002 X-Stat-Signature: ntemyct1qedbhy5axrrj1nsggj8rwznw X-Rspam-User: X-HE-Tag: 1788823534-498083 X-HE-Meta: U2FsdGVkX1/Nwbz/osMQT7DsnIRAU2HBkLszLxGFeeVIlkU7LR99JV8mlHp97mh9RrdOqQRxAfJgxYbfGxUtmpuDr2W7uo19vEesaP+z/2FQNVwzlpCWE1Jdzqe/txj0UPguUYvYJv7nBVEPGmveZrtwyYmwT68Mvk2nmhXdQbbbaE6kkTa8/M9ls7+fDB3m6n9ICTlY6WHRujPtGBkGuSiHGD/pA1gPFR4v2eLLTu3LNwpPUEwv1xvyzpBlER8Ohl9fArYMeqhXE4jLCNqPmcv/NYkqC18HusxCvumK06ERXUO3oWbF6aK8+kflSrDeFa0I2zz3+QxrrHZ/VLcXi86aQPlhwhbgPqVJ3OnhY4kfbFQ4NQWQ9rI1YHv69W2tt+dc3ddh18QaxHBTXsgbmXjH5xkX9/aIU+oK33npUUM75+4IiyuLBbnerK6xDKBmM8MhoeBNLqPjVeezN4TCagmktcyuJESWGo5JzkvRNMWMJEGHOTg/LYWExlNrKu+qow/kb+X9EsCp2QrZdhPjFCs21XqSO8cJHkctGhIkTFoxXaWmAjrpzyg6f/XBaRS+Caw1kfIY4Z6C1oBpyn52JgGiMisdY+YMIf5+RJdUt/L7xcrnD4+3E6fAuFPLxAaLT/IgtsIoI13amj+SMpOJVhpCYkZBu7OdIzfW9+XlSndq5FrpHsoDHFCK8bNRL+UHPAAm2hcnvXKv6zEqt+Cueq9NSfZnJFrw2+/MhNNlQIREFXoc6aHyBVYfj9j6vfPKGFI6kXzhiofDZjxiFBi1owNI/NX/fIoMVJJ4SqCw8q9Ii6PxwYQvkS667EnhzgYdg00T9rHhdFNzhRcjI1aCgI2eyTgtRAv3SouP9fp7IKB53UmxQB3PRu2SHorQf2t34BVXq5YrWRO/tLenwpWOhd1xwClkfTRnSsywK87R9irSn91mQPIxAcb6/Ec6KW5KNrLaS2P3SXMeCbBumMG TPheEMFZ ZmfVTAcwrGrGw8gR66X1F9SCpNKbsIInzb7KjE1DaVQKVgRK+oWVxqb2jigrnv6Gwy3YQyR5106qwb/SBqa5BmaS2YEouG5Aj7mYcbWGJn8ujnWA5vcBfWcIyzIXFDMSdIIjkEIxZmxoSFx5qa8++mUgj1cL40fZJCAeY6pczn+ewQe32bmniIGKT05XlYbYpduiYMfvrMyk9MG25B3Q4XHG2IiM7Ey5th7K8mCd3gYVl+PxZCur5kEzdcC8qwMzaH4AxEPju2QrJJuZXl7HIB6kzbBNsinT79Y7uIqgErTGeelbcZm6Z9hfCBAKhW9XHjVR7NzOlngEEi2bKuX+W3EpZCVPRDyJebX/YXHhx3oRDIsJ49I5vc0FvZpDXrXfP7Yd0qcXCLkLp9MA= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Aug 31, 2026 at 09:37:49AM -0700, Joshua Hahn wrote: > The existing percpu memcg stock drainer schedules a stock drain worker > per-cpu, one for every CPU containing the target memcg's stock. But you are introducing remote draining. Why do you need async drainer at all? Just always drain synchronously.