linux-kernel - [PATCH 1/2] blk-throttle: process limit change only through one function

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Date:	Wed, 15 Dec 2010 16:07:34 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	linux-kernel@...r.kernel.org, jaxboe@...ionio.com,
	paulmck@...ux.vnet.ibm.com
Cc:	vgoyal@...hat.com, oleg@...hat.com
Subject: [PATCH 1/2] blk-throttle: process limit change only through one function

o With the help of cgroup interface one can go and upate the bps/iops limits
  of existing group. Once the limits are udpated, a thread is woken up to
  see if some blocked group needs recalculation based on new limits and needs
  to be requeued.

o There was also a piece of code where I was checking for group limit update
  when a fresh bio comes in. This patch gets rid of that piece of code and
  keeps processing the limit change at one place throtl_process_limit_change().
  It just keeps the code simple and easy to understand.

Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
---
 block/blk-throttle.c |    8 +-------
 1 files changed, 1 insertions(+), 7 deletions(-)

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 381b09b..91bd444 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -998,14 +998,8 @@ int blk_throtl_bio(struct request_queue *q, struct bio **biop)
 		/*
 		 * There is already another bio queued in same dir. No
 		 * need to update dispatch time.
-		 * Still update the disptime if rate limits on this group
-		 * were changed.
 		 */
-		if (!tg->limits_changed)
-			update_disptime = false;
-		else
-			tg->limits_changed = false;
-
+		update_disptime = false;
 		goto queue_bio;
 	}
 
-- 
1.7.1

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