linux-kernel - Re: [PATCH 1/2] mm/slob: Mark zone page state to get slab usage at /proc/meminfo

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Date:	Tue, 23 Oct 2012 14:01:50 -0700
From:	Tim Bird <tim.bird@...sony.com>
To:	Christoph Lameter <cl@...ux.com>
CC:	Ezequiel Garcia <elezegarcia@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>
Subject: Re: [PATCH 1/2] mm/slob: Mark zone page state to get slab usage at
 /proc/meminfo

On 10/23/2012 1:31 PM, Christoph Lameter wrote:
> On Tue, 23 Oct 2012, Ezequiel Garcia wrote:
>
>> The issue is: with SLUB large kmallocs don't set NR_SLAB_UNRECLAIMABLE
>> zone item.
>> Thus, they don't show at /proc/meminfo. Is this okey?
> Yes. Other large allocations that are done directly via __get_free_pages()
> etc also do not show up there. Slab allocators are intended for small
> allocation and are not effective for large scale allocs. People will
> use multiple different ways of acquiring large memory areas. So there is
> no consistent accounting for that memory.
>
>
>
There's a certain irony here.  In embedded, we get all worked
up about efficiencies in the slab allocators, but don't have a good
way to track the larger memory allocations.  Am I missing
something, or is there really no way to track these large
scale allocations?
  -- Tim


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