linux-kernel - Re: [GIT PULL] Queue free fix (was Re: [PATCH] block: Free queue resources at blk_release

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Message-ID: <20110928181649.GA27441@infradead.org>
Date:	Wed, 28 Sep 2011 14:16:49 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>, Hannes Reinecke <hare@...e.de>,
	James Bottomley <James.Bottomley@...allels.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] Queue free fix (was Re: [PATCH] block: Free queue
 resources at blk_release_queue())

On Wed, Sep 28, 2011 at 02:09:05PM -0400, Vivek Goyal wrote:
> I had thought of implementing a separate lock for throttling. Then I
> noticed few operations like checking for queue flags where I would
> be required to hold queue locks.

Can you do a writeup of these issues?  E.g. if the flags are throtteling
specific we can move them to a separate flags field, if not we can
see if we can make them atomic or similar.

Right now on high iops device queue_lock is the major killer for
performance.  It's one major reason (*) why a lot of the high iops devices
are all moving to ->make_request, which has other issues.

(*) others are struct request allocation and the pointless merge hash
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