linux-kernel - Re: [PATCHSET] block, mempool, percpu: implement percpu mempool and fix blkcg percpu alloc deadlock

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Message-ID: <20111228004102.GK17712@google.com>
Date:	Tue, 27 Dec 2011 16:41:02 -0800
From:	Tejun Heo <tj@...nel.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, avi@...hat.com,
	nate@...nel.net, cl@...ux-foundation.org, oleg@...hat.com,
	axboe@...nel.dk, linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET] block, mempool, percpu: implement percpu mempool
 and fix blkcg percpu alloc deadlock

Hello,

On Wed, Dec 28, 2011 at 09:14:02AM +0900, KAMEZAWA Hiroyuki wrote:
> > This is essentially more specialized form of the mempool approach.  It
> > doesn't seem any simpler to me while being less generic.  I don't see
> > what the upside would be.
> 
> Hm, but this never causes -ENOMEM error, at all.

Ooh, I missed the part it falls back to the global counter if percpu
counters aren't allocated yet.  Yeah, this is an interesting approach.
I'll think more about it.

Thanks.

-- 
tejun
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