linux-kernel - Re: [patch v2 0/5] percpu_counter: bug fix and enhancement

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Date:	Thu, 12 May 2011 10:21:59 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"eric.dumazet@...il.com" <eric.dumazet@...il.com>,
	"cl@...ux.com" <cl@...ux.com>,
	"npiggin@...nel.dk" <npiggin@...nel.dk>
Subject: Re: [patch v2 0/5] percpu_counter: bug fix and enhancement

Hello,

On Thu, May 12, 2011 at 10:48:13AM +0800, Shaohua Li wrote:
> And the atomic64 approach not just improved the performance (which is
> always welcomed), but it also fixes a bug for 32-bit system. The usage
> of lglock is actually quite straightforward and is standard usage of
> lglock (the comments of lglock.h declare such usage), just lglock
> doesn't work for dynamatically allocated structure currently, which
> needs a convert.

lglock doesn't seem like the right solution for the problem at hand.
It's way too heavy handed and used to close a very small race window.
It doesn't seem right.  Eric's idea seemed much better to me and I
don't see why that can't be improved and used instead.  Would you be
interested in looking that direction?

Thanks.

-- 
tejun
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