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

From: Ezequiel Garcia
Date: Mon Oct 22 2012 - 10:50:28 EST

On Mon, Oct 22, 2012 at 11:41 AM, Christoph Lameter <cl@xxxxxxxxx> wrote:
> On Mon, 22 Oct 2012, Ezequiel Garcia wrote:
>> On page allocations, SLAB and SLUB modify zone page state counters
>> 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?

Sure. Does everyone agree on this?

My concern is:

1. SLOB is minimal, designed to have minimal footprint, and I'd like
to keep it that way. Of course, perhaps the change will add just a few bytes.

2. Since no SLOB user has ever complained on this...
How will this affect SLOB workings?
(I'm adding the uclinux guys, so at least they're aware of this)

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