mm: memcontrol: introduce obj_cgroup_{un}charge_pages
mainline inclusion from mainline-v5.13-rc1 commit e74d2259 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I4C0GB CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e74d225910ec3a9999f06934afa068b6a30babf8 ---------------------------------------------------------------------- We know that the unit of slab object charging is bytes, the unit of kmem page charging is PAGE_SIZE. If we want to reuse obj_cgroup APIs to charge the kmem pages, we should pass PAGE_SIZE (as third parameter) to obj_cgroup_charge(). Because the size is already PAGE_SIZE, we can skip touch the objcg stock. And obj_cgroup_{un}charge_pages() are introduced to charge in units of page level. In the latter patch, we also can reuse those two helpers to charge or uncharge a number of kernel pages to a object cgroup. This is just a code movement without any functional changes. Link: https://lkml.kernel.org/r/20210319163821.20704-3-songmuchun@bytedance.comSigned-off-by: NMuchun Song <songmuchun@bytedance.com> Acked-by: NRoman Gushchin <guro@fb.com> Acked-by: NJohannes Weiner <hannes@cmpxchg.org> Reviewed-by: NShakeel Butt <shakeelb@google.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Xiongchun Duan <duanxiongchun@bytedance.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org> Signed-off-by: NChen Huang <chenhuang5@huawei.com> Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com> Reviewed-by: NChen Wandun <chenwandun@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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