From: weiping zhang <zhangweiping@didichuxing.com>
To: <axboe@kernel.dk>
Cc: <linux-block@vger.kernel.org>
Subject: [PATCH] null_blk: add "no_sched" module parameter
Date: Sat, 30 Sep 2017 01:09:57 +0800 [thread overview]
Message-ID: <20170929170951.GA18535@localhost.didichuxing.com> (raw)
add an option that disable io scheduler for null block device.
Signed-off-by: weiping zhang <zhangweiping@didichuxing.com>
---
drivers/block/null_blk.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index bd92286..3c63863 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -154,6 +154,10 @@ enum {
NULL_Q_MQ = 2,
};
+static int g_no_sched;
+module_param_named(no_sched, g_no_sched, int, S_IRUGO);
+MODULE_PARM_DESC(no_sched, "No io scheduler");
+
static int g_submit_queues = 1;
module_param_named(submit_queues, g_submit_queues, int, S_IRUGO);
MODULE_PARM_DESC(submit_queues, "Number of submission queues");
@@ -1753,7 +1757,7 @@ static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set)
g_hw_queue_depth;
set->numa_node = nullb ? nullb->dev->home_node : g_home_node;
set->cmd_size = sizeof(struct nullb_cmd);
- set->flags = BLK_MQ_F_SHOULD_MERGE;
+ set->flags = g_no_sched ? BLK_MQ_F_NO_SCHED : BLK_MQ_F_SHOULD_MERGE;
set->driver_data = NULL;
if ((nullb && nullb->dev->blocking) || g_blocking)
--
2.9.4
next reply other threads:[~2017-09-29 17:09 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-29 17:09 weiping zhang [this message]
2017-09-29 21:39 ` [PATCH] null_blk: add "no_sched" module parameter Jens Axboe
2017-09-30 1:40 ` weiping zhang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170929170951.GA18535@localhost.didichuxing.com \
--to=zhangweiping@didichuxing.com \
--cc=axboe@kernel.dk \
--cc=linux-block@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox