linux-kernel - Re: [PATCH v2] mm/slab: Improve performance of gathering slabinfo stats

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Message-ID: <alpine.DEB.2.20.1608050917130.27772@east.gentwo.org>
Date:	Fri, 5 Aug 2016 09:17:33 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Aruna Ramakrishna <aruna.ramakrishna@...cle.com>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Mike Kravetz <mike.kravetz@...cle.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2] mm/slab: Improve performance of gathering slabinfo
 stats

On Thu, 4 Aug 2016, Aruna Ramakrishna wrote:

> On large systems, when some slab caches grow to millions of objects (and
> many gigabytes), running 'cat /proc/slabinfo' can take up to 1-2 seconds.
> During this time, interrupts are disabled while walking the slab lists
> (slabs_full, slabs_partial, and slabs_free) for each node, and this
> sometimes causes timeouts in other drivers (for instance, Infiniband).

Acked-by: Christoph Lameter <cl@...ux.com>