From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <47A8C508.6010305@cs.helsinki.fi> Date: Tue, 05 Feb 2008 22:20:24 +0200 From: Pekka Enberg MIME-Version: 1.0 Subject: Re: SLUB: Support for statistics to help analyze allocator behavior References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org