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b=QrrK/sCCLjOIgmdgePgUyqMNRU1+qQAirKV+BoaR4zRuyKe2T4loL8LfpRU+lTwt8 lxBdSpuag6vPrgQUL6L9tinExL7Y4E+OY9E6jm/t9hfir7LUmLPviG1itn049cvys+ zIOZNd29LRWfxH6hFMGDx3eKzaS01Hi57sx5UyEeb/I5XxUCUr4TlWlBZQJkTCvYvm XGXToKpzEHSZbmD7QRwpR1S7EGUKwJjmPONr+1U261ypvoM0xEvCTQlWuaEFycUlTW P6r+0yalyvLYqkWLWX4Kw7I2hohrjIDq0FhyDf6wcXD/aOuJXYMm4FDNx5nOMqNd6H XtKiqyEGsoEBQ== 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 Subject: [PATCH v7 02/16] mm/mglru: extract lruvec_populated_min_seq() helper Date: Thu, 12 Nov 2026 07:25:49 +0800 Message-Id: <20261111232603.9934-3-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-Rspamd-Server: rspam06 X-Stat-Signature: s134gtxehpmk31kdop6ygr39zgmaigq4 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-Rspamd-Queue-Id: BF2531A0007 X-Rspam-User: X-HE-Tag: 1794439583-315068 X-HE-Meta: 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 VFB1Gdts XO/rEWcPYmUbfeIiY9fUg0RsfjsBFwcxqrxJE4S5TTGg2TTPsRz+HfBOT3JWnliuo0hGiYDmIQNG5abXOC/XBsHdCYpa4Q2r3qQuGDk2q73X0+b/scwVMxiMT2N5TG23YJPMdJijPMzbyL0nImQ3kHc3G68Lr0A2SvIa1qU/ZxxksXNBEX4ZE0UcLe6IlrPiZjrcT+4T0rf+0760GnYM1xIIrrpyw0YkqRcLiy11XTOXBFxJDbHV5rDSoJFzHVZyc+eZozgWqJ0QYnOpGk6sI5PBpe/SfbB8TI35XM9NIbeo+3XjTaNX0lTROFy0XHucjwtmdjUKr5Zw7G5fNbQmtEfEIHCbf9ZhBlX8BgOluK/OIHASxyuT7JwjmgPRikWJaqO1UgN2GS/KhkSxFq4BaafwYoA== 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 From: Kairui Song The search for the oldest populated generation of a type, previously embedded in try_to_inc_min_seq(), is extracted into the new lruvec_populated_min_seq() helper. It returns the oldest populated seq of a given type, bounded by the given max_seq so the search never goes beyond it. No functional change. Signed-off-by: Kairui Song Signed-off-by: Barry Song (Xiaomi) Reviewed-by: Kunwu Chan --- mm/vmscan.c | 43 +++++++++++++++++++++++++++++-------------- 1 file changed, 29 insertions(+), 14 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index acc4efccda2f..4ac80968e634 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3991,30 +3991,45 @@ static bool inc_min_seq(struct lruvec *lruvec, int type, int swappiness) return true; } +/* Similar to lruvec_evictable_size, return the oldest populated seq of the type */ +static unsigned long lruvec_populated_min_seq(struct lruvec *lruvec, int type, + unsigned long max_seq) +{ + int gen, zone; + unsigned long min_seq; + struct lru_gen_folio *lrugen = &lruvec->lrugen; + + lockdep_assert_held(&lruvec->lru_lock); + + min_seq = READ_ONCE(lrugen->min_seq[type]); + while (min_seq <= max_seq) { + gen = lru_gen_from_seq(min_seq); + for (zone = 0; zone < MAX_NR_ZONES; zone++) { + if (!list_empty(&lrugen->folios[gen][type][zone])) + return min_seq; + } + min_seq++; + } + + return max_seq; +} + static void try_to_inc_min_seq(struct lruvec *lruvec, int swappiness) { - int gen, type, zone; + int type; bool seq_inc_flag = false; struct lru_gen_folio *lrugen = &lruvec->lrugen; DEFINE_MIN_SEQ(lruvec); + unsigned long seq; VM_WARN_ON_ONCE(!seq_is_valid(lruvec)); - /* find the oldest populated generation */ + /* Requires at least MIN_NR_GENS gens for basic functionality */ + seq = lrugen->max_seq - MIN_NR_GENS; for_each_evictable_type(type, swappiness) { - while (min_seq[type] + MIN_NR_GENS <= lrugen->max_seq) { - gen = lru_gen_from_seq(min_seq[type]); - - for (zone = 0; zone < MAX_NR_ZONES; zone++) { - if (!list_empty(&lrugen->folios[gen][type][zone])) - goto next; - } - - min_seq[type]++; + min_seq[type] = lruvec_populated_min_seq(lruvec, type, seq + 1); + if (min_seq[type] > lrugen->min_seq[type]) seq_inc_flag = true; - } -next: - ; } /* -- 2.34.1