From mboxrd@z Thu Jan 1 00:00:00 1970 From: Munehiro Ikeda Subject: Re: [PATCH] io-controller: implement per group request allocation limitation Date: Mon, 03 Aug 2009 22:04:09 -0400 Message-ID: <4A779719.1070900@ds.jp.nec.com> References: <1246564917-19603-1-git-send-email-vgoyal@redhat.com> <4A569FC5.7090801@cn.fujitsu.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4A569FC5.7090801@cn.fujitsu.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: Gui Jianfeng Cc: dhaval@linux.vnet.ibm.com, snitzer@redhat.com, peterz@infradead.org, dm-devel@redhat.com, dpshah@google.com, jens.axboe@oracle.com, agk@redhat.com, balbir@linux.vnet.ibm.com, paolo.valente@unimore.it, fernando@oss.ntt.co.jp, mikew@google.com, jmoyer@redhat.com, nauman@google.com, Vivek Goyal , righi.andrea@gmail.com, lizf@cn.fujitsu.com, fchecconi@gmail.com, akpm@linux-foundation.org, jbaron@redhat.com, linux-kernel@vger.kernel.org, s-uchida@ap.jp.nec.com, containers@lists.linux-foundation.org List-Id: dm-devel.ids 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 (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 --- 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@ds.jp.nec.com