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    Subject[PATCH 07/10] writeback: add some debug inode list counters to bdi stats
    Date
    Add some debug entries to be able to inspect the internal state of
    the writeback details.

    Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
    ---
    mm/backing-dev.c | 38 ++++++++++++++++++++++++++++++++++----
    1 files changed, 34 insertions(+), 4 deletions(-)
    diff --git a/mm/backing-dev.c b/mm/backing-dev.c
    index 45dfe51..dbaf866 100644
    --- a/mm/backing-dev.c
    +++ b/mm/backing-dev.c
    @@ -52,9 +52,29 @@ static void bdi_debug_init(void)
    static int bdi_debug_stats_show(struct seq_file *m, void *v)
    {
    struct backing_dev_info *bdi = m->private;
    + struct bdi_writeback *wb;
    unsigned long background_thresh;
    unsigned long dirty_thresh;
    unsigned long bdi_thresh;
    + unsigned long nr_dirty, nr_io, nr_more_io, nr_wb;
    + struct inode *inode;
    +
    + /*
    + * inode lock is enough here, the bdi->wb_list is protected by
    + * RCU on the reader side
    + */
    + nr_wb = nr_dirty = nr_io = nr_more_io = 0;
    + spin_lock(&inode_lock);
    + list_for_each_entry(wb, &bdi->wb_list, list) {
    + nr_wb++;
    + list_for_each_entry(inode, &wb->b_dirty, i_list)
    + nr_dirty++;
    + list_for_each_entry(inode, &wb->b_io, i_list)
    + nr_io++;
    + list_for_each_entry(inode, &wb->b_more_io, i_list)
    + nr_more_io++;
    + }
    + spin_unlock(&inode_lock);

    get_dirty_limits(&background_thresh, &dirty_thresh, &bdi_thresh, bdi);

    @@ -64,12 +84,22 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
    "BdiReclaimable: %8lu kB\n"
    "BdiDirtyThresh: %8lu kB\n"
    "DirtyThresh: %8lu kB\n"
    - "BackgroundThresh: %8lu kB\n",
    + "BackgroundThresh: %8lu kB\n"
    + "WriteBack threads:%8lu\n"
    + "b_dirty: %8lu\n"
    + "b_io: %8lu\n"
    + "b_more_io: %8lu\n"
    + "bdi_list: %8u\n"
    + "state: %8lx\n"
    + "wb_mask: %8lx\n"
    + "wb_list: %8u\n"
    + "wb_cnt: %8u\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));
    + K(bdi_thresh), K(dirty_thresh),
    + K(background_thresh), nr_wb, nr_dirty, nr_io, nr_more_io,
    + !list_empty(&bdi->bdi_list), bdi->state, bdi->wb_mask,
    + !list_empty(&bdi->wb_list), bdi->wb_cnt);
    #undef K

    return 0;
    --
    1.6.4.1.207.g68ea


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