[lkml]   [2008]   [Oct]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH 9/12] memcg allocate all page_cgroup at boot
    On Wed, 01 Oct 2008 11:29:04 +0530
    Balbir Singh <> wrote:
    > > __mem_cgroup_move_lists() will have some amount of changes. And we should
    > > check dead lock again.
    > __mem_cgroup_move_lists() is called from mem_cgroup_isolate_pages() and
    > mem_cgroup_move_lists(). In mem_cgroup_move_lists(), we have the page_cgroup
    > lock. I think the current code works on the assumption (although not documented
    > anywhere I've seen), that PAGE_CGROUP_FLAG_INACTIVE/ACTIVE/UNEVICTABLE bits are
    > protected by lru_lock. Please look at
    yes, I wrote them.

    > __mem_cgroup_remove_list
    > __mem_cgroup_add_list
    > __mem_cgroup_move_lists
    > __mem_cgroup_charge_common (sets this flag, before the pc is associated with the
    > page).
    But my point is lru_lock doesn't means page_cgroup is not locked by someone and
    we must take always lock_page_cgroup() when we modify flags.

    Then, mem_cgroup_isolate_page() should have to take lock.
    But this means we have to care preemption for avoiding deadlock.
    Maybe need some time to test.


     \ /
      Last update: 2008-10-01 08:13    [W:0.023 / U:119.832 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site