linux-kernel - Re: [RFC/PATCH] SLQB: Mark the allocator as broken PowerPC and S390

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Message-ID: <20090917100841.GF13002@csn.ul.ie>
Date:	Thu, 17 Sep 2009 11:08:42 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	cl@...ux-foundation.org, heiko.carstens@...ibm.com, mingo@...e.hu,
	npiggin@...e.de, sachinp@...ibm.com
Subject: Re: [RFC/PATCH] SLQB: Mark the allocator as broken PowerPC and S390

On Wed, Sep 16, 2009 at 09:37:39AM +0300, Pekka Enberg wrote:
> The SLQB allocator is known to be broken on certain PowerPC and S390
> configurations. Disable the allocator in Kconfig for those architectures
> until the issues are resolved.
> 

Can the issues be summarised?

The danger is if SLQB is being silently disabled, it'll never be noticed
or debugged :/

> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Christoph Lameter <cl@...ux-foundation.org>
> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Nick Piggin <npiggin@...e.de>
> Cc: Sachin Sant <sachinp@...ibm.com>
> Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
> ---
>  init/Kconfig |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/init/Kconfig b/init/Kconfig
> index c0d8a47..aaeddeb 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -1033,6 +1033,7 @@ config SLUB
>  
>  config SLQB
>  	bool "SLQB (Queued allocator)"
> +	depends on !PPC && !S390
>  	help
>  	  SLQB is a proposed new slab allocator.
>  
> -- 
> 1.5.6.3
> 
> 
> 
> --
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-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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