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

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Message-ID: <6599ad830804080029v1d8f2ff7g5254f32362fd7cb9@mail.gmail.com>
Date:	Tue, 8 Apr 2008 00:29:45 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	balbir@...ux.vnet.ibm.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)

On Tue, Apr 8, 2008 at 12:05 AM, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
>
> Paul Menage wrote:
>  > On Mon, Apr 7, 2008 at 11:52 PM, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
>  >>  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?
>  >>
>  >
>  > How about a simple program that creates N threads that just sleep,
>  > then has the main thread exit?
>  >
>
>  That is not really representative of anything. I have that program handy. How do
>  we measure the impact on throughput?

It's very representative of how much additional overhead in terms of
mm->owner churn there is in a large multi-threaded application
exiting, which is the thing that you're trying to optimize with the
delayed thread group leader checks.

Paul
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