linux-kernel - Re: [patch 08/10] SLUB: Optional fast path using cmpxchg

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Message-ID: <Pine.LNX.4.64.0710281957470.28636@schroedinger.engr.sgi.com>
Date:	Sun, 28 Oct 2007 19:59:27 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Pekka J Enberg <penberg@...helsinki.fi>
cc:	Matthew Wilcox <matthew@....cx>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch 08/10] SLUB: Optional fast path using cmpxchg_local

On Sun, 28 Oct 2007, Pekka J Enberg wrote:

> Can you please write a comment of the locking rules when cmpxchg_local() 
> is used? Looks as if we could push that local_irq_save() to slub_lock() 
> and local_irq_restore() to slub_unlock() and deal with the unused flags 
> variable for the non-CONFIG_FAST_CMPXCHG_LOCAL case with a macro, no?

Hmmmm... Maybe .. The locking rules are not changed at all by this patch. 
The cmpxchg_local is only used for the per cpu object list. The per cpu 
slabs are frozen.

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