linux-kernel - Re: [RFC 0/3] Slab Defrag / Slab Targeted Reclaim and general Slab API changes

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Date:	Sat, 5 May 2007 08:39:19 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, dgc@....com,
	Mel Gorman <mel@....ul.ie>
Subject: Re: [RFC 0/3] Slab Defrag / Slab Targeted Reclaim and general Slab
 API changes

On Sat, 5 May 2007, Eric Dumazet wrote:

> > Then add ___cacheline_aligned_in_smp or specify the alignment in the various
> > other ways that exist. Practice is that most slabs specify
> > SLAB_HWCACHE_ALIGN. So most slabs are cache aligned today.
> 
> Yes but this alignement is dynamic, not at compile time.
> 
> include/asm-i386/processor.h:739:#define cache_line_size()
> (boot_cpu_data.x86_cache_alignment)

Ahh.. I did not see that before.

> So adding ____cacheline_aligned  to 'struct file' for example would be a
> regression for people with PII or PIII

Yuck.

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