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    Subject[PATCH -mmotm 3/5] page_cgroup: introduce file cache flags
    Date
    Introduce page_cgroup flags to keep track of file cache pages.

    Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Signed-off-by: Andrea Righi <arighi@develer.com>
    ---
    include/linux/page_cgroup.h | 22 +++++++++++++++++++++-
    1 files changed, 21 insertions(+), 1 deletions(-)

    diff --git a/include/linux/page_cgroup.h b/include/linux/page_cgroup.h
    index bf9a913..65247e4 100644
    --- a/include/linux/page_cgroup.h
    +++ b/include/linux/page_cgroup.h
    @@ -40,7 +40,11 @@ enum {
    PCG_USED, /* this object is in use. */
    PCG_ACCT_LRU, /* page has been accounted for */
    /* for cache-status accounting */
    - PCG_FILE_MAPPED,
    + PCG_FILE_MAPPED, /* page is accounted as file rss*/
    + PCG_FILE_DIRTY, /* page is dirty */
    + PCG_FILE_WRITEBACK, /* page is being written back to disk */
    + PCG_FILE_WRITEBACK_TEMP, /* page is used as temporary buffer for FUSE */
    + PCG_FILE_UNSTABLE_NFS, /* NFS page not yet committed to the server */
    };

    #define TESTPCGFLAG(uname, lname) \
    @@ -83,6 +87,22 @@ TESTPCGFLAG(FileMapped, FILE_MAPPED)
    SETPCGFLAG(FileMapped, FILE_MAPPED)
    CLEARPCGFLAG(FileMapped, FILE_MAPPED)

    +TESTPCGFLAG(FileDirty, FILE_DIRTY)
    +SETPCGFLAG(FileDirty, FILE_DIRTY)
    +CLEARPCGFLAG(FileDirty, FILE_DIRTY)
    +
    +TESTPCGFLAG(FileWriteback, FILE_WRITEBACK)
    +SETPCGFLAG(FileWriteback, FILE_WRITEBACK)
    +CLEARPCGFLAG(FileWriteback, FILE_WRITEBACK)
    +
    +TESTPCGFLAG(FileWritebackTemp, FILE_WRITEBACK_TEMP)
    +SETPCGFLAG(FileWritebackTemp, FILE_WRITEBACK_TEMP)
    +CLEARPCGFLAG(FileWritebackTemp, FILE_WRITEBACK_TEMP)
    +
    +TESTPCGFLAG(FileUnstableNFS, FILE_UNSTABLE_NFS)
    +SETPCGFLAG(FileUnstableNFS, FILE_UNSTABLE_NFS)
    +CLEARPCGFLAG(FileUnstableNFS, FILE_UNSTABLE_NFS)
    +
    static inline int page_cgroup_nid(struct page_cgroup *pc)
    {
    return page_to_nid(pc->page);
    --
    1.6.3.3


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