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

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Message-ID: <20070822200910.GA25687@Krystal>
Date:	Wed, 22 Aug 2007 16:09:10 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Christoph Lameter <clameter@....com>
Cc:	Andi Kleen <andi@...stfloor.org>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, mingo@...hat.com
Subject: Re: [PATCH] SLUB use cmpxchg_local

* Christoph Lameter (clameter@....com) wrote:
>  void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags)
> @@ -1577,7 +1590,10 @@ static void __slab_free(struct kmem_cach
>  {
>  	void *prior;
>  	void **object = (void *)x;
> +	unsigned long flags;
>  
> +	local_irq_save(flags);
> +	put_cpu_no_resched();

Those two lines may skip a preempt_check.

Could we change them to this instead ?
  
  put_cpu();
  local_irq_save(flags);

Otherwise, it would be good to call

  preempt_check_resched();

  After each local_irq_restore() in this function.

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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