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    Subject[PATCH 12/12] debug: expose BDI statistics in sysfs.
    Expose the per BDI stats in /sys/block/<dev>/queue/*

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    ---
    block/ll_rw_blk.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
    mm/page-writeback.c | 2 +-
    2 files changed, 50 insertions(+), 1 deletion(-)

    Index: linux-2.6/block/ll_rw_blk.c
    ===================================================================
    --- linux-2.6.orig/block/ll_rw_blk.c 2007-04-12 17:35:03.000000000 +0200
    +++ linux-2.6/block/ll_rw_blk.c 2007-04-12 17:36:49.000000000 +0200
    @@ -3991,6 +3991,37 @@ static ssize_t queue_nr_unstable_show(st
    return sprintf(page, "%lld\n", bdi_stat(&q->backing_dev_info, BDI_UNSTABLE));
    }

    +extern void get_writeout_scale(struct backing_dev_info *, int *, int *);
    +
    +static ssize_t queue_nr_cache_ratio_show(struct request_queue *q, char *page)
    +{
    + int scale, div;
    +
    + get_writeout_scale(&q->backing_dev_info, &scale, &div);
    + scale *= 1024;
    + scale /= div;
    +
    + return sprintf(page, "%d\n", scale);
    +}
    +
    +extern void
    +get_dirty_limits(long *pbackground, long *pdirty, long *pbdi_dirty,
    + struct backing_dev_info *bdi);
    +
    +static ssize_t queue_nr_cache_size_show(struct request_queue *q, char *page)
    +{
    + long background, dirty, bdi_dirty;
    + get_dirty_limits(&background, &dirty, &bdi_dirty, &q->backing_dev_info);
    + return sprintf(page, "%ld\n", bdi_dirty);
    +}
    +
    +static ssize_t queue_nr_cache_total_show(struct request_queue *q, char *page)
    +{
    + long background, dirty, bdi_dirty;
    + get_dirty_limits(&background, &dirty, &bdi_dirty, &q->backing_dev_info);
    + return sprintf(page, "%ld\n", dirty);
    +}
    +
    static struct queue_sysfs_entry queue_requests_entry = {
    .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
    .show = queue_requests_show,
    @@ -4035,6 +4066,21 @@ static struct queue_sysfs_entry queue_un
    .show = queue_nr_unstable_show,
    };

    +static struct queue_sysfs_entry queue_cache_ratio_entry = {
    + .attr = {.name = "cache_ratio", .mode = S_IRUGO },
    + .show = queue_nr_cache_ratio_show,
    +};
    +
    +static struct queue_sysfs_entry queue_cache_size_entry = {
    + .attr = {.name = "cache_size", .mode = S_IRUGO },
    + .show = queue_nr_cache_size_show,
    +};
    +
    +static struct queue_sysfs_entry queue_cache_total_entry = {
    + .attr = {.name = "cache_total", .mode = S_IRUGO },
    + .show = queue_nr_cache_total_show,
    +};
    +
    static struct queue_sysfs_entry queue_iosched_entry = {
    .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
    .show = elv_iosched_show,
    @@ -4050,6 +4096,9 @@ static struct attribute *default_attrs[]
    &queue_dirty_entry.attr,
    &queue_writeback_entry.attr,
    &queue_unstable_entry.attr,
    + &queue_cache_ratio_entry.attr,
    + &queue_cache_size_entry.attr,
    + &queue_cache_total_entry.attr,
    &queue_iosched_entry.attr,
    NULL,
    };
    Index: linux-2.6/mm/page-writeback.c
    ===================================================================
    --- linux-2.6.orig/mm/page-writeback.c 2007-04-12 17:36:05.000000000 +0200
    +++ linux-2.6/mm/page-writeback.c 2007-04-12 17:36:49.000000000 +0200
    @@ -237,7 +237,7 @@ static unsigned long determine_dirtyable
    return x + 1; /* Ensure that we never return 0 */
    }

    -static void
    +void
    get_dirty_limits(long *pbackground, long *pdirty, long *pbdi_dirty,
    struct backing_dev_info *bdi)
    {
    --

    -
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