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    Subject[PATCH 1/5] writeback: account per-bdi accumulated dirtied pages
    Introduce the BDI_DIRTIED counter. It will be used for estimating the
    bdi's dirty bandwidth.

    CC: Jan Kara <jack@suse.cz>
    CC: Michael Rubin <mrubin@google.com>
    CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
    ---
    include/linux/backing-dev.h | 1 +
    mm/backing-dev.c | 2 ++
    mm/page-writeback.c | 1 +
    3 files changed, 4 insertions(+)

    --- linux-next.orig/include/linux/backing-dev.h 2011-06-12 20:58:31.000000000 +0800
    +++ linux-next/include/linux/backing-dev.h 2011-06-12 20:58:40.000000000 +0800
    @@ -40,6 +40,7 @@ typedef int (congested_fn)(void *, int);
    enum bdi_stat_item {
    BDI_RECLAIMABLE,
    BDI_WRITEBACK,
    + BDI_DIRTIED,
    BDI_WRITTEN,
    NR_BDI_STAT_ITEMS
    };
    --- linux-next.orig/mm/page-writeback.c 2011-06-12 20:58:31.000000000 +0800
    +++ linux-next/mm/page-writeback.c 2011-06-12 20:58:40.000000000 +0800
    @@ -1530,6 +1530,7 @@ void account_page_dirtied(struct page *p
    __inc_zone_page_state(page, NR_FILE_DIRTY);
    __inc_zone_page_state(page, NR_DIRTIED);
    __inc_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE);
    + __inc_bdi_stat(mapping->backing_dev_info, BDI_DIRTIED);
    task_dirty_inc(current);
    task_io_account_write(PAGE_CACHE_SIZE);
    }
    --- linux-next.orig/mm/backing-dev.c 2011-06-12 20:58:31.000000000 +0800
    +++ linux-next/mm/backing-dev.c 2011-06-12 20:58:55.000000000 +0800
    @@ -97,6 +97,7 @@ static int bdi_debug_stats_show(struct s
    "BdiDirtyThresh: %10lu kB\n"
    "DirtyThresh: %10lu kB\n"
    "BackgroundThresh: %10lu kB\n"
    + "BdiDirtied: %10lu kB\n"
    "BdiWritten: %10lu kB\n"
    "BdiWriteBandwidth: %10lu kBps\n"
    "b_dirty: %10lu\n"
    @@ -109,6 +110,7 @@ static int bdi_debug_stats_show(struct s
    K(bdi_thresh),
    K(dirty_thresh),
    K(background_thresh),
    + (unsigned long) K(bdi_stat(bdi, BDI_DIRTIED)),
    (unsigned long) K(bdi_stat(bdi, BDI_WRITTEN)),
    (unsigned long) K(bdi->write_bandwidth),
    nr_dirty,



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