| Re: [PATCH] Show slab memory usage on OOM and SysRq-M (v3) [message #12195 is a reply to message #12135] |
Fri, 20 April 2007 05:08  |
Andrew Morton
Messages: 127
Registered: December 2005
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Senior Member |
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On Wed, 18 Apr 2007 11:13:01 +0400 Pavel Emelianov <xemul@sw.ru> wrote:
> The out_of_memory() function and SysRq-M handler call
> show_mem() to show the current memory usage state.
>
> This is also helpful to see which slabs are the largest
> in the system.
>
> Thanks Pekka for good idea of how to make it better.
>
> The nr_pages is stored on kmem_list3 because:
>
> 1. as Eric pointed out, we do not want to defeat
> NUMA optimizations;
> 2. we do not need for additional LOCK-ed operation on
> altering this field - l3->list_lock is already taken
> where needed.
>
> Made naming more descriptive according to Dave.
>
> Signed-off-by: Pavel Emelianov <xemul@openvz.org>
> Signed-off-by: Kirill Korotaev <dev@openvz.org>
> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
> Cc: Eric Dumazet <dada1@cosmosbay.com>
> Cc: Dave Hansen <hansendc@us.ibm.com>
>
This is rather a lot of new code and even new locking.
Any time we actually need this what-the-heck-is-happening-in-slab info, the
reporter is able to work out the problem via /proc/slabinfo. Either by
taking a look in there before the system dies completely, or by looking in
there after the oom-killing.
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