show max io queue depth, it may doesn't reflect the real hardware's
max queue depth which was reduced by some software designs.
Signed-off-by: weiping zhang <zhangweiping@xxxxxxxxxxxxxxx>
---
block/blk-sysfs.c | 11 +++++++++++
include/linux/blkdev.h | 5 +++++
2 files changed, 16 insertions(+)
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 27aceab..66cba2b 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -256,6 +256,11 @@ static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
return queue_var_show(max_hw_sectors_kb, (page));
}
+static ssize_t queue_io_queue_depth_show(struct request_queue *q, char *page)
+{
+ return queue_var_show(queue_io_queue_depth(q), (page));
+}
+
#define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \
static ssize_t \
queue_show_##name(struct request_queue *q, char *page) \
@@ -678,6 +683,11 @@ static struct queue_sysfs_entry queue_wb_lat_entry = {
.store = queue_wb_lat_store,
};
+static struct queue_sysfs_entry queue_io_queue_depth_entry = {
+ .attr = {.name = "io_queue_depth", .mode = S_IRUGO },
+ .show = queue_io_queue_depth_show,
+};
+
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
static struct queue_sysfs_entry throtl_sample_time_entry = {
.attr = {.name = "throttle_sample_time", .mode = S_IRUGO | S_IWUSR },
@@ -719,6 +729,7 @@ static struct attribute *default_attrs[] = {
&queue_dax_entry.attr,
&queue_wb_lat_entry.attr,
&queue_poll_delay_entry.attr,
+ &queue_io_queue_depth_entry.attr,
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
&throtl_sample_time_entry.attr,
#endif
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 25f6a0c..bcd0af4 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1405,6 +1405,11 @@ static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
return q->limits.max_hw_sectors;
}
+static inline unsigned int queue_io_queue_depth(struct request_queue *q)
+{
+ return q->queue_depth;
+}
+
static inline unsigned short queue_max_segments(struct request_queue *q)
{
return q->limits.max_segments;
--
2.9.4
