diff options
Diffstat (limited to 'Documentation/ABI/stable/sysfs-block')
| -rw-r--r-- | Documentation/ABI/stable/sysfs-block | 16 |
1 files changed, 5 insertions, 11 deletions
diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block index 803f578dc023..0ed10aeff86b 100644 --- a/Documentation/ABI/stable/sysfs-block +++ b/Documentation/ABI/stable/sysfs-block @@ -603,16 +603,10 @@ Date: July 2003 Contact: linux-block@vger.kernel.org Description: [RW] This controls how many requests may be allocated in the - block layer for read or write requests. Note that the total - allocated number may be twice this amount, since it applies only - to reads or writes (not the accumulated sum). - - To avoid priority inversion through request starvation, a - request queue maintains a separate request pool per each cgroup - when CONFIG_BLK_CGROUP is enabled, and this parameter applies to - each such per-block-cgroup request pool. IOW, if there are N - block cgroups, each request queue may have up to N request - pools, each independently regulated by nr_requests. + block layer. Noted this value only represents the quantity for a + single blk_mq_tags instance. The actual number for the entire + device depends on the hardware queue count, whether elevator is + enabled, and whether tags are shared. What: /sys/block/<disk>/queue/nr_zones @@ -731,7 +725,7 @@ Contact: linux-block@vger.kernel.org Description: [RW] If the device is registered for writeback throttling, then this file shows the target minimum read latency. If this latency - is exceeded in a given window of time (see wb_window_usec), then + is exceeded in a given window of time (see curr_win_nsec), then the writeback throttling will start scaling back writes. Writing a value of '0' to this file disables the feature. Writing a value of '-1' to this file resets the value to the default |