Messages in this thread Patch in this message | | | From | Alex Shi <> | Subject | [PATCH v6 09/10] mm/memcg: fold lock in lock_page_lru | Date | Mon, 16 Dec 2019 17:26:25 +0800 |
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According to the calling path of commit_charge, the lrucare is bound with PageLRU, so we could just fold it under PageLRU. This has no functional change.
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: cgroups@vger.kernel.org Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org --- mm/memcontrol.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 138f298b694f..f8e279487e1d 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2621,9 +2621,10 @@ static void cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages) static struct lruvec *lock_page_lru(struct page *page, int *isolated) { - struct lruvec *lruvec = lock_page_lruvec_irq(page); + struct lruvec *lruvec = NULL; if (PageLRU(page)) { + lruvec = lock_page_lruvec_irq(page); ClearPageLRU(page); del_page_from_lru_list(page, lruvec, page_lru(page)); @@ -2637,17 +2638,18 @@ static struct lruvec *lock_page_lru(struct page *page, int *isolated) static void unlock_page_lru(struct page *page, int isolated, struct lruvec *locked_lruvec) { - struct lruvec *lruvec; + if (isolated) { + struct lruvec *lruvec; - unlock_page_lruvec_irq(locked_lruvec); - lruvec = lock_page_lruvec_irq(page); + if (locked_lruvec) + unlock_page_lruvec_irq(locked_lruvec); + lruvec = lock_page_lruvec_irq(page); - if (isolated) { VM_BUG_ON_PAGE(PageLRU(page), page); SetPageLRU(page); add_page_to_lru_list(page, lruvec, page_lru(page)); + unlock_page_lruvec_irq(lruvec); } - unlock_page_lruvec_irq(lruvec); } static void commit_charge(struct page *page, struct mem_cgroup *memcg, -- 1.8.3.1
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