linux-ext4 - Re: [PATCH] quota: remove dqptr

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Message-ID: <537F46ED.3050505@redhat.com>
Date:	Fri, 23 May 2014 08:02:37 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Niu Yawei <yawei.niu@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org
CC:	yawei.niu@...el.com, andreas.dilger@...el.com, jack@...e.cz,
	lai.siyao@...el.com
Subject: Re: [PATCH] quota: remove dqptr_sem for scalability

On 5/23/14, 12:22 AM, Niu Yawei wrote:
> 于 2014/5/23 12:02, Eric Sandeen 写道:
>> On 5/22/14, 5:47 AM, Niu Yawei wrote:
>>> There are several global locks in the VFS quota code which hurts
>>> performance a lot when quota accounting enabled, dqptr_sem is the major one.
>>>
>>> This patch tries to make the VFS quota code scalable with minimal changes.
>>>
>>> Following tests (mdtest & dbench) were running over ext4 fs in a
>>> centos6.5 vm (8 cpus, 4G mem, kenrel: 3.15.0-rc5+), and the result shows
>>> the patch relieved the lock congestion a lot.
>>>
>> Just noticed this patch - FWIW, Lustre has a 
>> "quota-replace-dqptr-sem-sles11sp2.patch" that they apply:
> Yes, I'm Lustre developer and trying to push the patch upstream. :)

I'm sorry.  I took a quick glance at both and somehow didn't realize they
were the same.  That's what I get for sending emails too late at night.

Sorry for the noise!  Carry on... ;)  And thanks for doing this!

-Eric

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