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Date: Tue, 8 Apr 2008 00:29:45 -0700
From: "Paul Menage" <menage@google.com>
To: balbir@linux.vnet.ibm.com
Subject: Re: [-mm] Add an owner to the mm_struct (v8)
Cc: "Pavel Emelianov" <xemul@openvz.org>, "Hugh Dickins" <hugh@veritas.com>,
       "Sudhir Kumar" <skumar@linux.vnet.ibm.com>,
       "YAMAMOTO Takashi" <yamamoto@valinux.co.jp>,
       linux-kernel@vger.kernel.org, taka@valinux.co.jp, linux-mm@kvack.org,
       "David Rientjes" <rientjes@google.com>,
       "Andrew Morton" <akpm@linux-foundation.org>,
       "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@jp.fujitsu.com>
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On Tue, Apr 8, 2008 at 12:05 AM, Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
>
> Paul Menage wrote:
>  > On Mon, Apr 7, 2008 at 11:52 PM, Balbir Singh <balbir@linux.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