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    Subject[PATCH 07/47] writeback: account per-bdi accumulated written pages
    From: Jan Kara <jack@suse.cz>

    Introduce the BDI_WRITTEN counter. It will be used for estimating the
    bdi's write bandwidth.

    Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Signed-off-by: Jan Kara <jack@suse.cz>
    Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
    ---
    include/linux/backing-dev.h | 1 +
    mm/backing-dev.c | 6 ++++--
    mm/page-writeback.c | 1 +
    3 files changed, 6 insertions(+), 2 deletions(-)

    --- linux-next.orig/include/linux/backing-dev.h 2010-12-08 22:43:58.000000000 +0800
    +++ linux-next/include/linux/backing-dev.h 2010-12-08 22:44:24.000000000 +0800
    @@ -40,6 +40,7 @@ typedef int (congested_fn)(void *, int);
    enum bdi_stat_item {
    BDI_RECLAIMABLE,
    BDI_WRITEBACK,
    + BDI_WRITTEN,
    NR_BDI_STAT_ITEMS
    };

    --- linux-next.orig/mm/backing-dev.c 2010-12-08 22:44:21.000000000 +0800
    +++ linux-next/mm/backing-dev.c 2010-12-08 22:44:24.000000000 +0800
    @@ -92,6 +92,7 @@ static int bdi_debug_stats_show(struct s
    "BdiDirtyThresh: %8lu kB\n"
    "DirtyThresh: %8lu kB\n"
    "BackgroundThresh: %8lu kB\n"
    + "BdiWritten: %8lu kB\n"
    "b_dirty: %8lu\n"
    "b_io: %8lu\n"
    "b_more_io: %8lu\n"
    @@ -99,8 +100,9 @@ static int bdi_debug_stats_show(struct s
    "state: %8lx\n",
    (unsigned long) K(bdi_stat(bdi, BDI_WRITEBACK)),
    (unsigned long) K(bdi_stat(bdi, BDI_RECLAIMABLE)),
    - K(bdi_thresh), K(dirty_thresh),
    - K(background_thresh), nr_dirty, nr_io, nr_more_io,
    + K(bdi_thresh), K(dirty_thresh), K(background_thresh),
    + (unsigned long) K(bdi_stat(bdi, BDI_WRITTEN)),
    + nr_dirty, nr_io, nr_more_io,
    !list_empty(&bdi->bdi_list), bdi->state);
    #undef K

    --- linux-next.orig/mm/page-writeback.c 2010-12-08 22:44:23.000000000 +0800
    +++ linux-next/mm/page-writeback.c 2010-12-08 22:44:24.000000000 +0800
    @@ -1329,6 +1329,7 @@ int test_clear_page_writeback(struct pag
    PAGECACHE_TAG_WRITEBACK);
    if (bdi_cap_account_writeback(bdi)) {
    __dec_bdi_stat(bdi, BDI_WRITEBACK);
    + __inc_bdi_stat(bdi, BDI_WRITTEN);
    __bdi_writeout_inc(bdi);
    }
    }



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