linux-kernel - Re: [PATCH] io-controller: implement per group request allocation limitation

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Date:	Mon, 03 Aug 2009 22:04:09 -0400
From:	Munehiro Ikeda <m-ikeda@...jp.nec.com>
To:	Gui Jianfeng <guijianfeng@...fujitsu.com>
CC:	Vivek Goyal <vgoyal@...hat.com>, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, dm-devel@...hat.com,
	jens.axboe@...cle.com, nauman@...gle.com, dpshah@...gle.com,
	lizf@...fujitsu.com, mikew@...gle.com, fchecconi@...il.com,
	paolo.valente@...more.it, ryov@...inux.co.jp,
	fernando@....ntt.co.jp, s-uchida@...jp.nec.com, taka@...inux.co.jp,
	jmoyer@...hat.com, dhaval@...ux.vnet.ibm.com,
	balbir@...ux.vnet.ibm.com, righi.andrea@...il.com,
	jbaron@...hat.com, agk@...hat.com, snitzer@...hat.com,
	akpm@...ux-foundation.org, peterz@...radead.org
Subject: Re: [PATCH] io-controller: implement per group request allocation
 limitation

Gui Jianfeng wrote, on 07/09/2009 09:56 PM:
> Hi Vivek,
>
> This patch exports a cgroup based per group request limits interface.
> and removes the global one. Now we can use this interface to perform
> different request allocation limitation for different groups.
>
> Signed-off-by: Gui Jianfeng<guijianfeng@...fujitsu.com>
(snip)

Hi Jianfeng,

If this helps, again.

A patch posted from Gui Jianfeng on 2009/07/09 adds per-cgroup
nr_requests control by io.nr_group_requests.  The patch missed to update
iog->nr_congestion_{on|off} and this patch adds the missing-link.

Signed-off-by: Munehiro "Muuhh" Ikeda <m-ikeda@...jp.nec.com>
---
  block/elevator-fq.c |   11 +++++++++++
  1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/block/elevator-fq.c b/block/elevator-fq.c
index 673e490..316bd8d 100644
--- a/block/elevator-fq.c
+++ b/block/elevator-fq.c
@@ -1607,6 +1607,10 @@ static int io_cgroup_nr_requests_write(struct cgroup *cgroup,
  					u64 val)
  {
  	struct io_cgroup *iocg;
+	struct io_group *iog;
+	struct elv_fq_data *efqd;
+	struct request_queue *q;
+	struct hlist_node *n;
  
  	if (val < BLKDEV_MIN_RQ)
  		val = BLKDEV_MIN_RQ;
@@ -1618,6 +1622,13 @@ static int io_cgroup_nr_requests_write(struct cgroup *cgroup,
  
  	spin_lock_irq(&iocg->lock);
  	iocg->nr_group_requests = (unsigned long)val;
+	hlist_for_each_entry(iog, n, &iocg->group_data, group_node) {
+		rcu_read_lock();
+		efqd = rcu_dereference(iog->key);
+		q = efqd->queue;
+		rcu_read_unlock();
+		elv_io_group_congestion_threshold(q, iog);
+	}
  	spin_unlock_irq(&iocg->lock);
  
  	cgroup_unlock();
-- 
1.6.2.5


-- 
IKEDA, Munehiro
   NEC Corporation of America
     m-ikeda@...jp.nec.com

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