linux-kernel - Re: changes caused by 0d11e6ac("blk-mq: fix use-after-free of request")

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Date:	Thu, 19 Dec 2013 22:37:13 +0800
From:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
To:	Matias Bjørling <m@...rling.me>
Cc:	Ming Lei <tom.leiming@...il.com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Huang Ying <ying.huang@...el.com>,
	Jens Axboe <axboe@...nel.dk>,
	LKML <linux-kernel@...r.kernel.org>,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
Subject: Re: changes caused by 0d11e6ac("blk-mq: fix use-after-free of
 request")

On Wed, Dec 18, 2013 at 11:29:30AM +0100, Matias Bjørling wrote:
> On 12/18/2013 09:50 AM, Yuanhan Liu wrote:
> >Hi,
> >
> >FYI, we noticed some changes caused by 0d11e6ac("blk-mq: fix use-after-free of request"):
> >
> 
> The blk-mq accounting was faulty up to that commit. We should
> compare the blk-mq with the previous block layer.
> 
> Could you try to revert the following patches:
> 
> f02b9ac virtio-blk: virtqueue_kick() must be ordered with other...
> 1cf7e9c virtio_blk: blk-mq support
> 
> and compare the two runs (upto 0d11e6ac applied, and the same, with
> the two patches reverted)

Hi Matias,

You are right. Those counter restore back with the two patches reverted(d1b4e3825c8848b0ea0f).

959a35f13eb785f982d7       0d11e6aca396e679c07b       d1b4e3825c8848b0ea0f  
---------------            -------------------------  -------------------------  
      0.00                      60.02 ~42%                  0.00       vpx/micro/xfstests/4HDD-btrfs-generic-quick
      0.00                     367.81 ~27%                  0.00       vpx/micro/xfstests/4HDD-ext4-generic-mid
      0.00                     411.64 ~13%                  0.00       vpx/micro/xfstests/4HDD-xfs-generic-mid
      0.00                     208.39 ~10%                  0.00       vpx/micro/xfstests/4HDD-xfs-generic-quick
      0.00                    1047.86                       0.00       TOTAL iostat.vdd.await

959a35f13eb785f982d7       0d11e6aca396e679c07b       d1b4e3825c8848b0ea0f  
---------------            -------------------------  -------------------------  
      0.00                     301.60 ~34%                  0.00       vpx/micro/xfstests/4HDD-btrfs-generic-mid
      0.00                     249.16 ~12%                  0.00       vpx/micro/xfstests/4HDD-btrfs-generic-quick
      0.00                      51.45 ~26%                  0.00       vpx/micro/xfstests/4HDD-ext4-generic-mid
      0.00                      91.51 ~21%                  0.04       vpx/micro/xfstests/4HDD-xfs-generic-127
      0.00                    1919.27 ~43%                  0.00       vpx/micro/xfstests/4HDD-xfs-generic-mid
      0.00                     121.04 ~11%                  0.00       vpx/micro/xfstests/4HDD-xfs-generic-quick
      0.00                    2734.03                       0.04       TOTAL iostat.vda.r_await

959a35f13eb785f982d7       0d11e6aca396e679c07b       d1b4e3825c8848b0ea0f  
---------------            -------------------------  -------------------------  
      0.00                     406.12 ~10%                  0.00       vpx/micro/xfstests/4HDD-btrfs-generic-mid
      0.00                     433.66 ~ 7%                  0.00       vpx/micro/xfstests/4HDD-btrfs-generic-quick
      0.00                     807.79 ~15%                  0.00       vpx/micro/xfstests/4HDD-ext4-generic-mid
      0.00                      42.94 ~67%                  0.51       vpx/micro/xfstests/4HDD-xfs-generic-127
      0.00                     592.20 ~16%                  0.00       vpx/micro/xfstests/4HDD-xfs-generic-mid
      0.00                     401.74 ~12%                  0.00       vpx/micro/xfstests/4HDD-xfs-generic-quick
      0.00                    2684.45                       0.51       TOTAL iostat.vda.w_await



	--yliu
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