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    SubjectRe: [PATCH 6/7] memcg: add per cgroup writeback pages accounting
    > @@ -2245,7 +2252,10 @@ int test_set_page_writeback(struct page *page)
    > {
    > struct address_space *mapping = page_mapping(page);
    > int ret;
    > + bool locked;
    > + unsigned long flags;
    >
    > + mem_cgroup_begin_update_page_stat(page, &locked, &flags);
    > if (mapping) {
    > struct backing_dev_info *bdi = mapping->backing_dev_info;
    > unsigned long flags;
    > @@ -2272,6 +2282,8 @@ int test_set_page_writeback(struct page *page)
    > }
    > if (!ret)
    > account_page_writeback(page);
    > +
    > + mem_cgroup_end_update_page_stat(page, &locked, &flags);
    > return ret;
    >
    > }

    Where is the MEM_CGROUP_STAT_FILE_WRITEBACK increased?

    Thanks,
    Fengguang


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