linux-kernel - Re: [PATCH/RFC] MM slub: add a sysfs entry to show the calculated number of fallback slabs

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Message-ID: <alpine.DEB.2.00.1011121028270.11746@router.home>
Date:	Fri, 12 Nov 2010 10:29:52 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Richard Kennedy <richard@....demon.co.uk>
cc:	Pekka Enberg <penberg@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH/RFC] MM slub: add a sysfs entry to show the calculated
 number of fallback slabs

On Fri, 12 Nov 2010, Richard Kennedy wrote:

> I know it's not ideal. Of course there already is a counter in
> CONFIG_SLUB_STATS but it only counts the total number of fallback slabs
> issued since boot time.
> I'm not sure if I can reliably decrement a fallback counter when a slab
> get freed. If the size was changed then we could have slabs with several
> different sizes, and off the top of my head I'm not sure if I can
> identify which ones were created as fallback slabs. I don't suppose
> there's a spare flag anywhere.

There are lots of spare flags to be used for SLABs. We just decommissioned
the use of one SLUB_DEBUG. Look at the patchlist and revert that one
giving it a new name like SLUB_FALLBACK.

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