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    Subject[PATCH 2/9] 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.

    Peter Zijlstra <a.p.zijlstra@chello.nl>:
    Move BDI_WRITTEN accounting into __bdi_writeout_inc().
    This will cover and fix fuse, which only calls bdi_writeout_inc().

    CC: Michael Rubin <mrubin@google.com>
    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 | 10 ++++++++--
    mm/page-writeback.c | 1 +
    3 files changed, 10 insertions(+), 2 deletions(-)

    --- linux-next.orig/include/linux/backing-dev.h 2011-06-12 13:29:02.000000000 +0800
    +++ linux-next/include/linux/backing-dev.h 2011-06-12 20:48:47.000000000 +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 2011-06-12 13:29:02.000000000 +0800
    +++ linux-next/mm/backing-dev.c 2011-06-12 20:49:51.000000000 +0800
    @@ -97,6 +97,7 @@ 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"
    @@ -104,8 +105,13 @@ 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 2011-06-12 13:29:06.000000000 +0800
    +++ linux-next/mm/page-writeback.c 2011-06-12 20:48:47.000000000 +0800
    @@ -219,6 +219,7 @@ int dirty_bytes_handler(struct ctl_table
    */
    static inline void __bdi_writeout_inc(struct backing_dev_info *bdi)
    {
    + __inc_bdi_stat(bdi, BDI_WRITTEN);
    __prop_inc_percpu_max(&vm_completions, &bdi->completions,
    bdi->max_prop_frac);
    }



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