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bh=Sz+akw3wpRLgZUlPI2FoNb4TEGhdSTFiLZleLq7ib24=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=CrJBR+IfaqoyJNKdiShU+ukvgr5AzAPtScOFfDV3LMtgKdH/z91frdPGeNlFOl9CU W1tVXZv9mF8cyKGslV4MuftKxocEVdH6+HpLBhqimecDB5SESeUJ/Eu3FqPYVZlOS/ ubrgq+nH9EtIPP5BDkwMvtwWQk9pq2iukmv5Ndd+x2YddhaIJdqNA06uZvkkJHxqtS gBYvdO+kFNGBgujvuacy7FIYZyeExvxaRJgMoTVXxlgf66+3IuA7OqgqMwDPmJ8444 fG3xW3uewZ8dBA4IYizJr/3VBTho09J3y24rUh4q+7hG6KlQXI4WfZKNLjWe6ifJRn 4w2Aez6EAP7lQ== From: "Barry Song (Xiaomi)" To: akpm@linux-foundation.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, linux-mm@kvack.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 v7 13/16] mm/mglru: Reduce LRU lock contention by shrinking folio batches in inc_min_seq Date: Thu, 12 Nov 2026 07:26:00 +0800 Message-Id: <20261111232603.9934-14-baohua@kernel.org> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20261111232603.9934-1-baohua@kernel.org> References: <20261111232603.9934-1-baohua@kernel.org> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: igkxgsx5epbb7udybo5jgbdtm5te8kn8 X-Rspamd-Queue-Id: 875E840011 X-Rspam-User: X-Rspamd-Server: rspam11 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-HE-Tag: 1794439639-730657 X-HE-Meta: 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 qn8SAMU8 6KyVGUpoWIgjNVaC4/egSP5Gp24TsRTP2S/o0sMtA0t1W+auEzMmxKJ8Eg7NuTzoCRGvDsGW+fbcbFla3vk4yZL7ZXMwa1Ej4oZ/pa1zrInFYFDPlRm9XUARidEow89pg+1An+jxuNUBGZm/iWokdjH5zex5chsVKT300GaqUChsN8VeEesb+6JkbDunLkCwaVBAPzXGSfDOTvsA7aBNVI6gjtYPUFASEwHDUYAc9uyqH7m4RMnhWh4iUkqHsRBJinGia5XPJdPqfgeU55yWUiK32HMlk2IqotHGQXrNyWH3Yp7NhlZR8+KoAkiPynUHb5crcZUlDsRWhMobbvl2KV50QFBIlity0TpPzIJY+10CKVtY= 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 7a48b82ea4c1..6315edf50376 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3911,7 +3911,7 @@ 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]); -- 2.34.1