linux-kernel - [GIT PULL] One last block fix

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Message-ID: <20140924161025.GA25787@kernel.dk>
Date:	Wed, 24 Sep 2014 10:10:25 -0600
From:	Jens Axboe <axboe@...com>
To:	<torvalds@...uxfoundation.org>
CC:	<linux-kernel@...r.kernel.org>
Subject: [GIT PULL] One last block fix

Hi Linus,

We've had an issue with scsi-mq where probing takes forever. This was
bisected down to the percpu changes for blk_mq_queue_enter(), and the
fact we now suffer an RCU grace period when killing a queue. SCSI
creates and destroys tons of queues, so this let to 10s of seconds of
stalls at boot for some.

Tejun has a real fix for this, but it's too involved for 3.17. So this
is a temporary workaround to expedite the queue killing until we can
fold in the real fix for 3.18 when that merge window opens.

Please pull!

  git://git.kernel.dk/linux-block.git for-linus

for you to fetch changes up to 0a30288da1aec914e158c2d7a3482a85f632750f:

  blk-mq, percpu_ref: implement a kludge for SCSI blk-mq stall during probe (2014-09-24 08:29:36 -0600)

----------------------------------------------------------------
Tejun Heo (1):
      blk-mq, percpu_ref: implement a kludge for SCSI blk-mq stall during probe

 block/blk-mq.c                  | 11 ++++++++++-
 include/linux/percpu-refcount.h |  1 +
 lib/percpu-refcount.c           | 16 ++++++++++++++++
 3 files changed, 27 insertions(+), 1 deletion(-)

-- 
Jens Axboe

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