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

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Date:	Mon, 22 Oct 2012 14:41:37 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Ezequiel Garcia <elezegarcia@...il.com>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Tim Bird <tim.bird@...sony.com>,
	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 Mon, 22 Oct 2012, Ezequiel Garcia wrote:

> On page allocations, SLAB and SLUB modify zone page state counters
> NR_SLAB_UNRECLAIMABLE or NR_SLAB_RECLAIMABLE.
> This allows to obtain slab usage information at /proc/meminfo.
>
> Without this patch, /proc/meminfo will show zero Slab usage for SLOB.
>
> Since SLOB discards SLAB_RECLAIM_ACCOUNT flag, we always use
> NR_SLAB_UNRECLAIMABLE zone state item.

Hmmm... that is unfortunate. The NR_SLAB_RECLAIMABLE stat is used by
reclaim to make decisions on when to reclaim inodes and dentries.

Could you fix that to properly account the reclaimable/unreclaimable
pages?
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