From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Richard Henderson <rth@redhat.com>
Cc: Jason Baron <jbaron@redhat.com>, Paul Turner <pjt@google.com>,
linux-kernel@vger.kernel.org,
Bharata B Rao <bharata@linux.vnet.ibm.com>,
Dhaval Giani <dhaval.giani@gmail.com>,
Balbir Singh <bsingharora@gmail.com>,
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
Srivatsa Vaddagiri <vatsa@in.ibm.com>,
Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>,
Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>,
Ingo Molnar <mingo@elte.hu>, Pavel Emelyanov <xemul@openvz.org>
Subject: Re: [RFT][patch 17/18] sched: use jump labels to reduce overhead when bandwidth control is inactive
Date: Fri, 05 Aug 2011 17:14:14 +0200 [thread overview]
Message-ID: <1312557254.28695.12.camel@twins> (raw)
In-Reply-To: <4E3C0813.5050303@redhat.com>
On Fri, 2011-08-05 at 08:11 -0700, Richard Henderson wrote:
> 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.
Right, so I was wondering about things like whole-program-optimization
passes at link time. Since I've no clue why the proposed patch does what
it does, its hard to say what invariant is needed to be kept.
next prev parent reply other threads:[~2011-08-05 15:14 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-22 0:32 Jason Baron
2011-07-22 0:57 ` Paul Turner
2011-07-22 1:17 ` [RFT][patch 17/18] sched: use jump labels to reduce overhead when bandwidth control is inactive Jason Baron
2011-07-22 1:38 ` Paul Turner
2011-07-27 21:58 ` Jason Baron
2011-08-05 3:53 ` Paul Turner
2011-08-05 7:21 ` Peter Zijlstra
2011-08-05 3:55 ` Paul Turner
2011-08-05 18:28 ` Jason Baron
2011-08-05 8:30 ` Peter Zijlstra
2011-08-05 15:11 ` Richard Henderson
2011-08-05 15:14 ` Peter Zijlstra [this message]
2011-08-05 15:24 ` Jason Baron
-- strict thread matches above, loose matches on Subject: below --
2011-07-21 16:43 [patch 00/18] CFS Bandwidth Control v7.2 Paul Turner
2011-07-21 16:43 ` [RFT][patch 17/18] sched: use jump labels to reduce overhead when bandwidth control is inactive Paul Turner
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