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From: Pekka Enberg <penberg@cs.helsinki.fi>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: SLUB: Support for statistics to help analyze allocator behavior
Date: Tue, 05 Feb 2008 22:20:24 +0200	[thread overview]
Message-ID: <47A8C508.6010305@cs.helsinki.fi> (raw)
In-Reply-To: <Pine.LNX.4.64.0802051005010.11705@schroedinger.engr.sgi.com>

Christoph Lameter wrote:
> On Tue, 5 Feb 2008, Pekka J Enberg wrote:
> 
>> Hi Christoph,
>>
>> On Mon, 4 Feb 2008, Christoph Lameter wrote:
>>> The statistics provided here allow the monitoring of allocator behavior
>>> at the cost of some (minimal) loss of performance. Counters are placed in
>>> SLUB's per cpu data structure that is already written to by other code.
>> Looks good but I am wondering if we want to make the statistics per-CPU so 
>> that we can see the kmalloc/kfree ping-pong of, for example, hackbench 
> 
> We could do that.... Any idea how to display that kind of information 
> in a meaningful way. Parameter conventions for slabinfo?

We could just print out one total summary and one summary for each CPU 
(and maybe show % of total allocations/fees. That way you can 
immediately spot if some CPUs are doing more allocations/freeing than 
others.

			Pekka

  reply	other threads:[~2008-02-05 20:21 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-05  6:20 Christoph Lameter
2008-02-05  7:24 ` Pekka J Enberg
2008-02-05  7:49   ` Eric Dumazet
2008-02-05  7:54     ` Pekka J Enberg
2008-02-05 18:08       ` Christoph Lameter
2008-02-05 18:55         ` Eric Dumazet
2008-02-05 19:07           ` Christoph Lameter
2008-02-05 18:05   ` Christoph Lameter
2008-02-05 20:20     ` Pekka Enberg [this message]
2008-02-05 21:58       ` Christoph Lameter
2008-02-05 22:19         ` Pekka J Enberg
2008-02-06  8:19 ` Andrew Morton
2008-02-06 19:01   ` Christoph Lameter
2008-02-06 21:00   ` SLUB: statistics improvements Christoph Lameter
2008-02-06 21:40     ` Eric Dumazet
2008-02-06 22:10       ` Christoph Lameter

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