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Subject[RFC][PATCH 6/6] 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 | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 51 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
@@ -3923,6 +3923,33 @@ static ssize_t queue_max_hw_sectors_show
return queue_var_show(max_hw_sectors_kb, (page));
}

+static ssize_t queue_nr_dirty_show(struct request_queue *q, char *page)
+{
+ return sprintf(page, "%lu\n", bdi_stat(&q->backing_dev_info, BDI_DIRTY));
+}
+
+static ssize_t queue_nr_writeback_show(struct request_queue *q, char *page)
+{
+ return sprintf(page, "%lu\n", bdi_stat(&q->backing_dev_info, BDI_WRITEBACK));
+}
+
+static ssize_t queue_nr_unstable_show(struct request_queue *q, char *page)
+{
+ return sprintf(page, "%lu\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_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);
+}

static struct queue_sysfs_entry queue_requests_entry = {
.attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
@@ -3947,6 +3974,26 @@ static struct queue_sysfs_entry queue_ma
.show = queue_max_hw_sectors_show,
};

+static struct queue_sysfs_entry queue_dirty_entry = {
+ .attr = {.name = "dirty_pages", .mode = S_IRUGO },
+ .show = queue_nr_dirty_show,
+};
+
+static struct queue_sysfs_entry queue_writeback_entry = {
+ .attr = {.name = "writeback_pages", .mode = S_IRUGO },
+ .show = queue_nr_writeback_show,
+};
+
+static struct queue_sysfs_entry queue_unstable_entry = {
+ .attr = {.name = "unstable_pages", .mode = S_IRUGO },
+ .show = queue_nr_unstable_show,
+};
+
+static struct queue_sysfs_entry queue_cache_entry = {
+ .attr = {.name = "cache_ratio", .mode = S_IRUGO },
+ .show = queue_nr_cache_show,
+};
+
static struct queue_sysfs_entry queue_iosched_entry = {
.attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
.show = elv_iosched_show,
@@ -3958,6 +4005,10 @@ static struct attribute *default_attrs[]
&queue_ra_entry.attr,
&queue_max_hw_sectors_entry.attr,
&queue_max_sectors_entry.attr,
+ &queue_dirty_entry.attr,
+ &queue_writeback_entry.attr,
+ &queue_unstable_entry.attr,
+ &queue_cache_entry.attr,
&queue_iosched_entry.attr,
NULL,
};
--

-
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