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Thu, 06 Aug 2026 00:09:57 -0700 (PDT) Received: from localhost.localdomain ([210.184.73.204]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84f45bc9cffsm760154b3a.59.2026.08.06.00.09.50 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 06 Aug 2026 00:09:56 -0700 (PDT) From: Hao Jia To: akpm@linux-foundation.org, tj@kernel.org, hannes@cmpxchg.org, shakeel.butt@linux.dev, mhocko@kernel.org, yosry@kernel.org, mkoutny@suse.com, nphamcs@gmail.com, chengming.zhou@linux.dev, muchun.song@linux.dev, roman.gushchin@linux.dev Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Hao Jia Subject: [PATCH v4 0/2] mm/zswap: Fixes and improves the zswap shrink Date: Thu, 6 Aug 2026 15:09:41 +0800 Message-Id: <20260806070943.95542-1-jiahao.kernel@gmail.com> X-Mailer: git-send-email 2.39.2 (Apple Git-143) MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam07 X-Rspam-User: X-Stat-Signature: gzhwjmz6xirjtrdefcxdueaupp3pzhbn X-Rspamd-Queue-Id: 7003F20007 X-HE-Tag: 1786000198-491611 X-HE-Meta: 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 ehWtlhYX 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Hao Jia This series fixes and improves the zswap global shrinker (shrink_worker()): Patch 1: Fix missing global shrinker when memory cgroup is disabled. Patch 2: Extend shrink_memcg() to support batch writeback and thereby improving the writeback efficiency in the shrink_worker() and zswap_store() paths. v3->v4: - Remove the nr_to_scan parameter from shrink_memcg() and cap the per-node scan count at SWAP_CLUSTER_MAX to avoid writeback unfairness across NUMA nodes caused by a shared global scan quota. v2->v3: - Added user impact to the commit 1 message. - Updated writeback batch size to SWAP_CLUSTER_MAX to avoid introducing new magic macros. And enabled batched shrinking in the zswap_store() path as well. - Re-benchmarked performance data with the updated patch. v1->v2: - Add a reschedule check to the -ENOENT return path in shrink_memcg() to handle the theoretical issue of prolonged heavy concurrent zswap stores. - Remove the shrink_memcg() return value changes part, and include a more detailed test report in the commit message. [v3] https://lore.kernel.org/all/20260729084206.77793-1-jiahao.kernel@gmail.com [v2] https://lore.kernel.org/all/20260717085151.22822-1-jiahao.kernel@gmail.com [v1] https://lore.kernel.org/all/20260714081510.16895-1-jiahao.kernel@gmail.com Hao Jia (2): mm/zswap: Fix global shrinker when memory cgroup is disabled mm/zswap: Support batch writeback in shrink_memcg() mm/zswap.c | 26 ++++++++++++++++++-------- 1 file changed, 18 insertions(+), 8 deletions(-) -- 2.34.1