linux-ext4 - Re: [RFC PATCH 0/3] block: Fix fsync slowness with CFQ cgroups

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Date:	Tue, 28 Jun 2011 15:00:39 +0400
From:	Konstantin Khlebnikov <khlebnikov@...allels.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jaxboe@...ionio.com" <jaxboe@...ionio.com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"jmoyer@...hat.com" <jmoyer@...hat.com>
Subject: Re: [RFC PATCH 0/3] block: Fix fsync slowness with CFQ cgroups

Vivek Goyal wrote:
> This patch series seems to be working for me. I did testing for ext4 only.
> This series is based on for-3.1/core branch of Jen's block tree.
> Konstantin, can you please give it a try and see if it fixes your
> issue.

It works for me too, for ext3 and ext4, on top 3.0-rc5, after these trivial fixes:

--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1511,7 +1519,7 @@ static void cfq_add_rq_rb(struct request *rq)
          * if that happens, put the alias on the dispatch list
          */
         while ((__alias = elv_rb_add(&cfqq->sort_list, rq)) != NULL)
-               cfq_dispatch_insert(cfqd->queue, __alias);
+               cfq_dispatch_insert(cfqd->queue, __alias, false);

         if (!cfq_cfqq_on_rr(cfqq))
                 cfq_add_cfqq_rr(cfqd, cfqq);
@@ -3797,12 +3797,11 @@ cfq_set_depends_on_task(struct request_queue *q, struct task_struct *tsk)
          */
         rcu_read_lock();
         if (task_blkio_cgroup(current) == task_blkio_cgroup(tsk))
-               return;
-       rcu_read_unlock();
+               goto out_unlock_rcu;

         cic = cfq_cic_lookup(cfqd, current->io_context);
         if (!cic)
-               return;
+               goto out_unlock_rcu;

         task_lock(tsk);
         spin_lock_irq(q->queue_lock);
@@ -3847,6 +3846,8 @@ cfq_set_depends_on_task(struct request_queue *q, struct task_struct *tsk)
  out_unlock:
         spin_unlock_irq(q->queue_lock);
         task_unlock(tsk);
+out_unlock_rcu:
+       rcu_read_unlock();
  }
--
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