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d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=gehHRqDo170D8ggpcqt5L8gyM4hpiP3lcUb1NEGWSW0=; b=fvmFfa6vwp4REilJx4z3GxYreeEIQSNp/YEj3TfyPfV9wCSdDru5V7+jy0ESKOmi8T fLL+cwkrutGqFYsfhUu4f+1YmlCeVa3N4lRTs/ubCt995bNZWvjsH/9cIgBZBzw9AsVf diRwyXzY6rKbB1UgBEUvJslgPkOhlDIM5AUy2qT6HVw6hyo5rTo26MF6savhNQ6QSlMH GyhoTFbh6YcxH2ruUGApAUl3Z0ivSuP3zhMlYu2pKQgOJN3HIDCa2Nd3OV2x3SckyT8s BnCjKpz8HDq7TCLItyTE+Idn8p6xgYskiUTCZTqv23Ri03UMFbgtEok76LoDZgLShUPl 7Ciw== X-Gm-Message-State: AOAM530Toos3Baray+m0nuY/5D3mMjR5Ow06Q7lNnbZCcGv1Rh2a1BA5 CkK47/eX24H98hwPcv+pLbRx3Anmigo= X-Google-Smtp-Source: ABdhPJyX7PxrdwZp8JKMZ0YQglNCQFusxUHnYaz351dVMOTyN3ebFvNOcxIaiSUrRohWV46bcjlxOvwE/VU= X-Received: by 2002:ad4:54c6:: with SMTP id j6mr20694395qvx.126.1597776433446; Tue, 18 Aug 2020 11:47:13 -0700 (PDT) Date: Tue, 18 Aug 2020 12:47:03 -0600 In-Reply-To: <20200818184704.3625199-1-yuzhao@google.com> Message-Id: <20200818184704.3625199-2-yuzhao@google.com> Mime-Version: 1.0 References: <20200818184704.3625199-1-yuzhao@google.com> X-Mailer: git-send-email 2.28.0.220.ged08abb693-goog Subject: [PATCH v2 2/3] mm: remove superfluous __ClearPageActive() From: Yu Zhao To: Andrew Morton Cc: Alexander Duyck , Huang Ying , David Hildenbrand , Michal Hocko , Yang Shi , Qian Cai , Mel Gorman , Nicholas Piggin , "=?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?=" , Hugh Dickins , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Joonsoo Kim , Yu Zhao Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: B379918140B67 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: To activate a page, mark_page_accessed() always holds a reference on it. It either gets a new reference when adding a page to lru_pvecs.activate_page or reuses an existing one it previously got when it added a page to lru_pvecs.lru_add. So it doesn't call SetPageActive() on a page that doesn't have any reference left. Therefore, the race is impossible these days (I didn't brother to dig into its history). For other paths, namely reclaim and migration, a reference count is always held while calling SetPageActive() on a page. SetPageSlabPfmemalloc() also uses SetPageActive(), but it's irrelevant to LRU pages. Signed-off-by: Yu Zhao --- mm/memremap.c | 2 -- mm/swap.c | 2 -- 2 files changed, 4 deletions(-) diff --git a/mm/memremap.c b/mm/memremap.c index 03e38b7a38f1..3a06eb91cb59 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -451,8 +451,6 @@ void free_devmap_managed_page(struct page *page) return; } - /* Clear Active bit in case of parallel mark_page_accessed */ - __ClearPageActive(page); __ClearPageWaiters(page); mem_cgroup_uncharge(page); diff --git a/mm/swap.c b/mm/swap.c index 25c4043491b3..999a84dbe12c 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -900,8 +900,6 @@ void release_pages(struct page **pages, int nr) del_page_from_lru_list(page, lruvec, page_off_lru(page)); } - /* Clear Active bit in case of parallel mark_page_accessed */ - __ClearPageActive(page); __ClearPageWaiters(page); list_add(&page->lru, &pages_to_free); -- 2.28.0.220.ged08abb693-goog