• Johannes Weiner's avatar
    mm: memcontrol: generalize locking for the page->mem_cgroup binding · 81f8c3a4
    Johannes Weiner authored
    These patches tag the page cache radix tree eviction entries with the
    memcg an evicted page belonged to, thus making per-cgroup LRU reclaim
    work properly and be as adaptive to new cache workingsets as global
    reclaim already is.
    
    This should have been part of the original thrash detection patch
    series, but was deferred due to the complexity of those patches.
    
    This patch (of 5):
    
    So far the only sites that needed to exclude charge migration to
    stabilize page->mem_cgroup have been per-cgroup page statistics, hence
    the name mem_cgroup_begin_page_stat().  But per-cgroup thrash detection
    will add another site that needs to ensure page->mem_cgroup lifetime.
    
    Rename these locking functions to the more generic lock_page_memcg() and
    unlock_page_memcg().  Since charge migration is a cgroup1 feature only,
    we might be able to delete it at some point, and these now easy to
    identify locking sites along with it.
    Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
    Suggested-by: default avatarVladimir Davydov <vdavydov@virtuozzo.com>
    Acked-by: default avatarVladimir Davydov <vdavydov@virtuozzo.com>
    Cc: Michal Hocko <mhocko@suse.cz>
    Cc: David Rientjes <rientjes@google.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    81f8c3a4
buffer.c 88.7 KB