linux-kernel - Re: [-mm] Add an owner to the mm

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Message-ID: <47FB162D.1020506@linux.vnet.ibm.com>
Date:	Tue, 08 Apr 2008 12:22:29 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Paul Menage <menage@...gle.com>
CC:	Pavel Emelianov <xemul@...nvz.org>,
	Hugh Dickins <hugh@...itas.com>,
	Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	linux-kernel@...r.kernel.org, taka@...inux.co.jp,
	linux-mm@...ck.org, David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [-mm] Add an owner to the mm_struct (v8)

Paul Menage wrote:
> On Sat, Apr 5, 2008 at 10:38 PM, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
>>  >
>>  > How long does the test run for? How many threads does each client have?
>>
>>  The test on each client side runs for about 10 seconds. I saw the client create
>>  up to 411 threads.
>>
> 
> I'm not convinced that an application that creates 400 threads and
> exits in 10 seconds is particular representative of a high-performance
> application.
> 

I agree, but like I said earlier, this was the easily available ready made
application I found. Do you know of any other highly threaded micro benchmark?

> But I agree that it's an example of something it may be worth trying
> to optimize for.
> 
> You mention that you saw tgid exits - what order did the individual
> threads exit in? If we threw the mm to the last thread in the thread
> group rather than the first, would that help?

The order was different each time. I suspect that when we have too many threads
all exiting at once and they are all running in parallel, I don't know if we can
have ordering or predict the order in which threads exit.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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