lkml.org 
[lkml]   [2015]   [Jun]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v5 2/5] block: loop: set QUEUE_FLAG_NOMERGES for request queue of loop
Date
It doesn't make sense to enable merge because the I/O
submitted to backing file is handled page by page.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
---
drivers/block/loop.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 40580dc..10cc583 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1595,6 +1595,12 @@ static int loop_add(struct loop_device **l, int i)
}
lo->lo_queue->queuedata = lo;

+ /*
+ * It doesn't make sense to enable merge because the I/O
+ * submitted to backing file is handled page by page.
+ */
+ queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, lo->lo_queue);
+
INIT_LIST_HEAD(&lo->write_cmd_head);
INIT_WORK(&lo->write_work, loop_queue_write_work);

--
1.9.1


\
 
 \ /
  Last update: 2015-06-09 16:01    [W:0.096 / U:0.400 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site