linux-kernel - Re: [tip:core/locking 2/3] lockdep:define preallocated "stack" for BFS as per cpu variable

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Message-ID: <d82e647a0907220610i484b8d57q39a0141579669b58@mail.gmail.com>
Date:	Wed, 22 Jul 2009 21:10:53 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mingo@...e.hu, torvalds@...ux-foundation.org
Subject: Re: [tip:core/locking 2/3] lockdep:define preallocated "stack" for 
	BFS as per cpu variable

2009/7/22 Peter Zijlstra <a.p.zijlstra@...llo.nl>:
> On Wed, 2009-07-22 at 20:58 +0800, tom.leiming@...il.com wrote:
>> From: Ming Lei <tom.leiming@...il.com>
>
> This patch can use a changelog.
>
> Why is this needed, isn't all that serialized by the graph_lock anyway?
> Or are there a few paths where this isn't the case and we're now racy?

It is really serialized by the graph_lock, but we can prevent cpu cache from
being flushing by different cpu access,  which seems that can be avoided by
per cpu variables. Right?

Thanks.

-- 
Lei Ming
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