linux-kernel - Re: [PATCH] SLUB use cmpxchg

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Message-ID: <Pine.LNX.4.64.0708271510020.8783@schroedinger.engr.sgi.com>
Date:	Mon, 27 Aug 2007 15:12:19 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	Peter Zijlstra <peterz@...radead.org>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, mingo@...hat.com
Subject: Re: [PATCH] SLUB use cmpxchg_local

On Mon, 27 Aug 2007, Mathieu Desnoyers wrote:

> > The slow path would require disable preemption and two interrupt disables.
> If the slow path have to call new_slab, then yes. But it seems that not
> every slow path must call it, so for the other slow paths, only one
> interrupt disable would be required.

If we include new_slab then we get to 3 times:

1. In the cmpxchg_local emulation that fails

2. For the slow path

3. When calling the page allocator.

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