linux-kernel - Re: [RFT][patch 17/18] sched: use jump labels to reduce overhead when bandwidth control is inactive

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Message-ID: <4E3C0813.5050303@redhat.com>
Date:	Fri, 05 Aug 2011 08:11:15 -0700
From:	Richard Henderson <rth@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Jason Baron <jbaron@...hat.com>, Paul Turner <pjt@...gle.com>,
	linux-kernel@...r.kernel.org,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Balbir Singh <bsingharora@...il.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>, Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [RFT][patch 17/18] sched: use jump labels to reduce overhead
 when bandwidth control is inactive

On 08/05/2011 01:30 AM, Peter Zijlstra wrote:
> OK, so _WHY_ does that make a difference and will a next version of
> gnu-binutils not mess that up?

The Why is micro-architectual, and I can't answer that.

But ld will never re-order the files as given on the command-line.
There are too many functions and tables that are constructed 
piece-wise from input sections; re-ordering them would change
the semantics of the program.


r~
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