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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Axel Rasmussen , Yuanchu Xie , Wei Xu , Brendan Jackman , Zi Yan , cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, yc-core@yandex-team.ru Subject: Re: [PATCH] mm: add memory.compact_unevictable_allowed cgroup attribute Message-Id: <20260317121736.f73a828de2a989d1a07efea1@linux-foundation.org> In-Reply-To: <20260317100058.2316997-1-d-tatianin@yandex-team.ru> References: <20260317100058.2316997-1-d-tatianin@yandex-team.ru> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 9F0C9C000F X-Stat-Signature: da5tdygr4xwp4yehp64ry1uttx7wp14c X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1773775058-345372 X-HE-Meta: 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 N4tmI7rS 6hIoL0kY9V1A5nQNYS+wcxvNgtEKc+d4tzMRpVL306IC1NyRX4+XhjyUnvUBQHGVrjiJY+MOag0JCmLnU8b/mMbZ9AgBvfBVtKyD0eh/pGjTs4D1Sw2a8Namr8gbA/ejLvsJEwCQf14p2sCUCAqFEGwxjZZIhC0X7bQRQz+m1YX9E5dzjpWns9F5D5OiRbdiTY4pmEoUaKB2MfuWLOIU+LGwziJSaa2kupyo5GI+tfo0vCKuGz8RWO14tMgQisEhhzWzAJWKvuFHaEjOh6KlHqMAIre9oistbgd8dFfAPw6UGA764Pf6M2SjZiycQWMfQP6NGF6QsgnYFWFELLMeZOYi7K7/wcR/fxobzCWMpHjbR5cSGFsAOiD1qS9ONjGm3FMCk Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 17 Mar 2026 13:00:58 +0300 Daniil Tatianin wrote: > The current global sysctl compact_unevictable_allowed is too coarse. > In environments with mixed workloads, we may want to protect specific > important cgroups from compaction to ensure their stability and > responsiveness, while allowing compaction for others. > > This patch introduces a per-memcg compact_unevictable_allowed attribute. > This allows granular control over whether unevictable pages in a specific > cgroup can be compacted. The global sysctl still takes precedence if set > to disallow compaction, but this new setting allows opting out specific > cgroups. > > This also adds a new ISOLATE_UNEVICTABLE_CHECK_MEMCG flag to > isolate_migratepages_block to preserve the old behavior for the > ISOLATE_UNEVICTABLE flag unconditionally used by > isolage_migratepages_range. AI review asked questions: https://sashiko.dev/#/patchset/20260317100058.2316997-1-d-tatianin@yandex-team.ru