linux-kernel - Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28

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Message-Id: <20081117.113637.72930858.davem@davemloft.net>
Date:	Mon, 17 Nov 2008 11:36:37 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	mingo@...e.hu
Cc:	dada1@...mosbay.com, rjw@...k.pl, linux-kernel@...r.kernel.org,
	kernel-testers@...r.kernel.org, cl@...ux-foundation.org,
	efault@....de, a.p.zijlstra@...llo.nl,
	torvalds@...ux-foundation.org, shemminger@...tta.com
Subject: Re: [Bug #11308] tbench regression on each kernel release from
 2.6.22 -&gt; 2.6.28

From: Ingo Molnar <mingo@...e.hu>
Date: Mon, 17 Nov 2008 18:08:44 +0100

> Mike Galbraith has been spending months trying to pin down all the 
> issues.

Yes Mike has been doing tireless good work.

Another thing I noticed is that because all of the scheduler
core operations are now function pointer callbacks, the
call chain is deeper for core operations like wake_up().

Much of it used to be completely inlined into try_to_wake_up()

With the addition of the RB tree stuff, that adds yet another
unavoidable depth of function call.

wake_up() is usually at the deepest part of the call chain,
so this is a big deal
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