• Mel Gorman's avatar
    fs: nfs: inform the VM about pages being committed or unstable · f919b196
    Mel Gorman authored
    VM page reclaim uses dirty and writeback page states to determine if
    flushers are cleaning pages too slowly and that page reclaim should
    stall waiting on flushers to catch up.  Page state in NFS is a bit more
    complex and a clean page can be unreclaimable due to being unstable
    which is effectively "dirty" from the perspective of the VM from reclaim
    context.  Similarly, if the inode is currently being committed then it's
    similar to being under writeback.
    
    This patch adds a is_dirty_writeback() handled for NFS that checks if a
    pages backing inode is being committed and should be accounted as
    writeback and if a page has private state indicating that it is
    effectively dirty.
    Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
    Cc: Johannes Weiner <hannes@cmpxchg.org>
    Cc: Michal Hocko <mhocko@suse.cz>
    Cc: Rik van Riel <riel@redhat.com>
    Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Cc: Jiri Slaby <jslaby@suse.cz>
    Cc: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
    Cc: Zlatko Calusic <zcalusic@bitsync.net>
    Cc: dormando <dormando@rydia.net>
    Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    f919b196
file.c 25.7 KB