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    Subject[PATCH 19/23] mm: 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 | 29 +++++++++++++++++++++++++++++
    1 file changed, 29 insertions(+)

    Index: linux-2.6/block/ll_rw_blk.c
    ===================================================================
    --- linux-2.6.orig/block/ll_rw_blk.c
    +++ linux-2.6/block/ll_rw_blk.c
    @@ -3982,6 +3982,23 @@ static ssize_t queue_max_hw_sectors_show
    return queue_var_show(max_hw_sectors_kb, (page));
    }

    +static ssize_t queue_nr_reclaimable_show(struct request_queue *q, char *page)
    +{
    + unsigned long long nr_reclaimable =
    + bdi_stat(&q->backing_dev_info, BDI_RECLAIMABLE);
    +
    + return sprintf(page, "%llu\n",
    + nr_reclaimable >> (PAGE_CACHE_SHIFT - 10));
    +}
    +
    +static ssize_t queue_nr_writeback_show(struct request_queue *q, char *page)
    +{
    + unsigned long long nr_writeback =
    + bdi_stat(&q->backing_dev_info, BDI_WRITEBACK);
    +
    + return sprintf(page, "%llu\n",
    + nr_writeback >> (PAGE_CACHE_SHIFT - 10));
    +}

    static struct queue_sysfs_entry queue_requests_entry = {
    .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
    @@ -4006,6 +4023,16 @@ static struct queue_sysfs_entry queue_ma
    .show = queue_max_hw_sectors_show,
    };

    +static struct queue_sysfs_entry queue_reclaimable_entry = {
    + .attr = {.name = "reclaimable_kb", .mode = S_IRUGO },
    + .show = queue_nr_reclaimable_show,
    +};
    +
    +static struct queue_sysfs_entry queue_writeback_entry = {
    + .attr = {.name = "writeback_kb", .mode = S_IRUGO },
    + .show = queue_nr_writeback_show,
    +};
    +
    static struct queue_sysfs_entry queue_iosched_entry = {
    .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
    .show = elv_iosched_show,
    @@ -4017,6 +4044,8 @@ static struct attribute *default_attrs[]
    &queue_ra_entry.attr,
    &queue_max_hw_sectors_entry.attr,
    &queue_max_sectors_entry.attr,
    + &queue_reclaimable_entry.attr,
    + &queue_writeback_entry.attr,
    &queue_iosched_entry.attr,
    NULL,
    };
    --

    -
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