linux-kernel - Re: [PATCH] SLUB The unqueued slab allocator V3

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Date:	Wed, 28 Feb 2007 17:48:12 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	clameter@...r.sgi.com
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] SLUB The unqueued slab allocator V3

From: Christoph Lameter <clameter@...r.sgi.com>
Date: Wed, 28 Feb 2007 17:06:19 -0800 (PST)

> On Wed, 28 Feb 2007, David Miller wrote:
> 
> > Arguably SLAB_HWCACHE_ALIGN and SLAB_MUST_HWCACHE_ALIGN should
> > not be set here, but SLUBs change in semantics in this area
> > could cause similar grief in other areas, an audit is probably
> > in order.
> > 
> > The above example was from sparc64, but x86 does the same thing
> > as probably do other platforms which use SLAB for pagetables.
> 
> Maybe this will address these concerns?
> 
> Index: linux-2.6.21-rc2/mm/slub.c
> ===================================================================
> --- linux-2.6.21-rc2.orig/mm/slub.c	2007-02-28 16:54:23.000000000 -0800
> +++ linux-2.6.21-rc2/mm/slub.c	2007-02-28 17:03:54.000000000 -0800
> @@ -1229,8 +1229,10 @@ static int calculate_order(int size)
>  static unsigned long calculate_alignment(unsigned long flags,
>  		unsigned long align)
>  {
> -	if (flags & (SLAB_MUST_HWCACHE_ALIGN|SLAB_HWCACHE_ALIGN))
> +	if (flags & SLAB_HWCACHE_ALIGN)
>  		return L1_CACHE_BYTES;
> +	if (flags & SLAB_MUST_HWCACHE_ALIGN)
> +		return max(align, (unsigned long)L1_CACHE_BYTES);
>  
>  	if (align < ARCH_SLAB_MINALIGN)
>  		return ARCH_SLAB_MINALIGN;

It would achiever parity with existing SLAB behavior, sure.
-
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