linux-kernel - Re: 2.6.22-rc2-mm1

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Date:	Wed, 23 May 2007 20:26:13 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Christoph Lameter <clameter@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.22-rc2-mm1

On Wed, 23 May 2007 20:00:52 -0700 (PDT) Christoph Lameter wrote:

> New version with Randy's fixes:

well...  :)


> Index: slub/Documentation/kernel-parameters.txt
> ===================================================================
> --- slub.orig/Documentation/kernel-parameters.txt	2007-05-23 19:34:49.000000000 -0700
> +++ slub/Documentation/kernel-parameters.txt	2007-05-23 19:58:04.000000000 -0700
> @@ -1589,6 +1589,37 @@ and is between 256 and 4096 characters. 
>  
>  	slram=		[HW,MTD]
>  
> +	slub_debug	[MM, SLUB]
> +			Enabling slub_debug allows to determine the culprit

                                            allows ___(who)____

> +			if slab objects become corrupted. Enabling slub_debug
> +			creates guard zones around objects and poisons objects
> +			when not in use. Also tracks the last alloc / free.
> +			For more information see Documentation/vm/slub.txt.
> +

> +	slub_min_order=	[MM, SLUB]
> +			Determines the mininum page order for slabs. Must be
> +			lower than slub_max_order

                                                ^.  (end with period)

> +			For more information see Documentation/vm/slub.txt.


> Index: slub/Documentation/vm/slub.txt
> ===================================================================
> --- slub.orig/Documentation/vm/slub.txt	2007-05-23 19:34:49.000000000 -0700
> +++ slub/Documentation/vm/slub.txt	2007-05-23 19:59:45.000000000 -0700

> +Slab validation
> +---------------
> +
> +SLUB can validate all object if the kernel was booted with slub_debug. In
> +order to do so you must have the slabinfo tool. Then you can do
> +
> +slabinfo -v
> +
> +which will test all objects. Output will be generated to the syslog.
> +
> +This also works in a more limited way if boot was without slab debug.
> +In that case slabinfo -v simply tests all reachable objects. Usually
> +these are in the cpu slabs and the partial slabs. Full slabs are not

                    CPU

> +tracked by SLUB in a non debug situation.


---
~Randy
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