linux-kernel - [PATCH 06/31] blk-throttle: remove spurious throtl_enqueue_tg() call from throtl_select

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Message-Id: <1367455189-6957-7-git-send-email-tj@kernel.org>
Date:	Wed,  1 May 2013 17:39:24 -0700
From:	Tejun Heo <tj@...nel.org>
To:	axboe@...nel.dk
Cc:	linux-kernel@...r.kernel.org, lizefan@...wei.com,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	vgoyal@...hat.com, Tejun Heo <tj@...nel.org>
Subject: [PATCH 06/31] blk-throttle: remove spurious throtl_enqueue_tg() call from throtl_select_dispatch()

throtl_select_dispatch() calls throtl_enqueue_tg() right after
tg_update_disptime(), which always calls the function anyway.  The
call is, while harmless, unnecessary.  Remove it.

This patch doesn't introduce any behavior difference.

Signed-off-by: Tejun Heo <tj@...nel.org>
---
 block/blk-throttle.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 3114622..3960787 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -816,10 +816,8 @@ static int throtl_select_dispatch(struct throtl_data *td, struct bio_list *bl)
 
 		nr_disp += throtl_dispatch_tg(td, tg, bl);
 
-		if (tg->nr_queued[0] || tg->nr_queued[1]) {
+		if (tg->nr_queued[0] || tg->nr_queued[1])
 			tg_update_disptime(td, tg);
-			throtl_enqueue_tg(td, tg);
-		}
 
 		if (nr_disp >= throtl_quantum)
 			break;
-- 
1.8.1.4

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