linux-kernel - Re: [PATCHSET] block: fixes for long standing issues

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Date:	Fri, 20 Apr 2012 10:10:31 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Tejun Heo <tj@...nel.org>
Cc:	vgoyal@...hat.com, ctalbott@...gle.com, rni@...gle.com,
	cgroups@...r.kernel.org, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET] block: fixes for long standing issues

On Thu, Apr 19 2012, Tejun Heo wrote:
> Hello,
> 
> This patchset fixes two long standing issues and one relatively new
> css ref leak.
> 
> a. elvpriv alloc failure, including ioc and icq failures, fails
>    request allocation.  As those aren't mempool backed and may fail
>    indefinitely, this can lead to deadlock under memory pressure.
> 
> b. blkgs don't have proper indexing.  With enough number of
>    request_queues and blk-throttle enabled, block layer can spend
>    considerable amount of cpu cycles walking the same list over and
>    over again.
> 
> c. __blkg_lookup_create() was leaking a css ref on failure path.
> 
> This patchset contains the following four patches.
> 
>  0001-block-collapse-blk_alloc_request-into-get_request.patch
>  0002-block-fix-elvpriv-allocation-failure-handling.patch
>  0003-blkcg-fix-blkcg-css-ref-leak-in-__blkg_lookup_create.patch
>  0004-blkcg-use-radix-tree-to-index-blkgs-from-blkcg.patch
> 
> 0001-0002 fix #a.  0003 fixes #c.  0004 fixes #b.
> 
> This patchset is on top of
> 
>   block/for-3.5/core 5bc4afb1ec "blkcg: drop BLKCG_STAT_{PRIV|POL|OFF} macros"
> + [1] [PATCHSET] block: per-queue policy activation, take#2
> + [2] [PATCHSET] block: cosmetic updates to blkcg API

Applied, thanks Tejun.

-- 
Jens Axboe

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