Expose the per BDI stats in /sys/block/<dev>/queue/*
Signed-off-by: Peter Zijlstra <[email protected]>
---
block/ll_rw_blk.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
Index: linux-2.6-mm/block/ll_rw_blk.c
===================================================================
--- linux-2.6-mm.orig/block/ll_rw_blk.c
+++ linux-2.6-mm/block/ll_rw_blk.c
@@ -3976,6 +3976,15 @@ 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)
+{
+ return sprintf(page, "%lld\n", bdi_stat(&q->backing_dev_info, BDI_RECLAIMABLE));
+}
+
+static ssize_t queue_nr_writeback_show(struct request_queue *q, char *page)
+{
+ return sprintf(page, "%lld\n", bdi_stat(&q->backing_dev_info, BDI_WRITEBACK));
+}
static struct queue_sysfs_entry queue_requests_entry = {
.attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
@@ -4006,6 +4020,16 @@ static struct queue_sysfs_entry queue_ma
.show = queue_max_hw_sectors_show,
};
+static struct queue_sysfs_entry queue_reclaimable_entry = {
+ .attr = {.name = "reclaimable_pages", .mode = S_IRUGO },
+ .show = queue_nr_reclaimable_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_iosched_entry = {
.attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
.show = elv_iosched_show,
@@ -4018,6 +4047,8 @@ static struct attribute *default_attrs[]
&queue_initial_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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