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b=Yfw0uYdHB28H6CZ6a1Qjriabq78wA7ne5Juecy/t5L8jf1M8DmFkK0I0tzYrCgl0r FZ8/NU2UKcvC8wRvEH4Tt4Bna6yVLzBwnM6cK+Rk0twV6YRyYhBBeJmoZUQ2yeHSWQ 1wKiw5xDYvscmMfC7RKfzl6IT3v/mLX1a+WUN8B/AZ/F75khkZJYZvmkYw40Qu+3wX MiOzmjsfCP9FSw9lDY5ftO3FJ3MgOyCKXqGu2vqaVjmuUnb5WYOoBqVngODp48k4mD vBuUWOTiep+CuYSPoqwOaiCZLgOpcA4Mv1bybyKLABcVWGagJ7VHe7WZTdcmfUOHNu aXqqj2OEyockw== From: "Barry Song (Xiaomi)" To: akpm@linux-foundation.org, linux-mm@kvack.org Cc: axelrasmussen@google.com, baolin.wang@linux.alibaba.com, baoquan.he@linux.dev, hannes@cmpxchg.org, hui.zhu@linux.dev, kasong@tencent.com, kunwu.chan@gmail.com, liam@infradead.org, lianux.mm@gmail.com, linux-kernel@vger.kernel.org, liuxiang.277@bytedance.com, lyugaofei@xiaomi.com, mhocko@kernel.org, mhocko@suse.com, qi.zheng@linux.dev, ridong.chen@linux.dev, rppt@kernel.org, ryncsn@gmail.com, shakeel.butt@linux.dev, surenb@google.com, wangzicheng@honor.com, weixugc@google.com, yuanchu@google.com, zhangbo56@xiaomi.com, zhuhui@kylinos.cn, sidchintamaneni@gmail.com, "Barry Song (Xiaomi)" Subject: [PATCH v8 13/16] mm/mglru: Reduce LRU lock contention by shrinking folio batches in inc_min_seq Date: Sat, 14 Nov 2026 02:55:38 +0800 Message-Id: <20261113185541.70203-14-baohua@kernel.org> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20261113185541.70203-1-baohua@kernel.org> References: <20261113185541.70203-1-baohua@kernel.org> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: B71D0180006 X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Stat-Signature: bcq4stournfkayhcqerhx9heewf8audh X-Rspam-User: X-HE-Tag: 1794596215-566122 X-HE-Meta: U2FsdGVkX19zU8kQCHk8gcpKujJ83LdtaH9LKbbDhxj2gDfd4qiGAMXlYxB7NKp0/mJ0x6tf7+tI3D4bW+0LNEFNmpo9wGSwVOr9iAjcH2MEylIog0WtzWbbe7a19Lj2SAnhE/rbZHPurDh1iF6twEdrEhyMDIblu1TCIQsa307V0cHmL57HrwfHKzAQdk0rXeckeKKMDv5336qJrSLjv/1Uy88MBcoqx1iWgaboCLNp0EJRClpR01dWFg/L/DC9/RzeS05ozxj+pOOB3kf+jd+eRjomew4OkHNorgDeokSCFE5HRL8WtWBz4+gQ3Yr1X4Tcj17lb4X4zrDpKWSGvrIvOs52uAPDM62yLCQ90aFHd/GtrgzChIe18tLnGkPvH0z6/gSdO5KiDwcizfSy32GXv1OnFzfh+76SmOTDgvcjwfYt2aLmF8XwH9XW/Hghy6Y3kODvVs5ejgYU03BMc94MEq+NZ39FnC1nNavIgMyW+ShjyAck5+mY1Re0uBEGw2zrjasXC8Fryi46sPMF185I2xLN903/f2CmuhljGFuP1NMDXSRDHVFQyDfp43a8DKgo60Q0jSEiCBlOG04Etup2y2BGWG4rudWmi36ouhUi/NQxj18mWIjgmeQSFD6n399wbdiG851gLWxt0CDlf9GeBLVKAxUEH3nhcuq62tfWB3TCFCeKVe3lQXi8yaUeypsammO70uZCA8u7njmYC0PnVb2+Ckmgdf4UuMqtF45En4kn8Ur2ZjMPQXV3WbcI16nkFCsCV8xUVN3k5Qz7iK/dti5Sf2d5bRrbIGn+BO8fzY3cw9yIFAzVfaQROKvBiAVwnEUwUS2hgFyOo/7NZLEPYai/cxPGXrZ56RJZrTbRKhSWq6UfueYDBPFE0fLe4VBf/GPz4bwgfWyMNUcgbko1VrAW7JoVFo6Yl79E8fFAfV0T9bSHnQ3wvlrmAE6bCKjKv9axjOlrhO8KxQ4 DevjkHsM 2EHlGS+4avt9p6VamzoSLtyjTPtaGy4U6UHFDQ0cptn4ppEwYj5+f4GNnDqBNfehkJOp857fvKb367ItRAkGBLr/xe+8Y0bO3dn5XQZczEgytyzQw5RrYzCaUTviXgE9NTbzqElj3HUorJH9ULLXPRrRx+7nZeBK70o/ywF0wR+DsL0423MCg5ckhLuRwwQ3dvYCZAZJPHCTMQkMGAmdmrWUsC6NJfMPn3BEOhTIaxfG8Jv7lqBKT81EKVYxj0WbD0xr+uj1A8439/tgGYTWFXldmqH0iNJRRy56SUqtjX0P9dyy48EBPZKPzhK3sTPZXam6CRgi9MD3jscRaFrBNnZX3ynyGjiEwDioa Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Reduce the number of folios moved from the oldest generation to the second-oldest generation in each batch. This shortens the time the lruvec lock is held, allowing concurrent LRU operations to make progress and significantly reducing LRU lock contention. Signed-off-by: Barry Song (Xiaomi) --- mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 6ed47089a330..2595f3fbe1b6 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3912,7 +3912,7 @@ static inline void flush_lru_batch(struct list_head *head, struct list_head **ba static bool inc_min_seq(struct lruvec *lruvec, int type, int swappiness) { int zone; - int remaining = MAX_LRU_BATCH; + int remaining = MIN_LRU_BATCH; struct lru_gen_folio *lrugen = &lruvec->lrugen; int hist = lru_hist_from_seq(lrugen->min_seq[type]); int new_gen, old_gen = lru_gen_from_seq(lrugen->min_seq[type]); -- 2.39.3 (Apple Git-146)