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Message-ID: <20120129163328.GC23408@elte.hu>
Date: Sun, 29 Jan 2012 17:33:28 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc: Cong Wang <xiyou.wangcong@...il.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Xiaotian Feng <xtfeng@...il.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] sched: Accelerate "pick_next_entity" under special
condition
* Michael Wang <wangyun@...ux.vnet.ibm.com> wrote:
> On 01/27/2012 12:42 PM, Cong Wang wrote:
>
> > On 01/27/2012 09:22 AM, Michael Wang wrote:
> >> Hi, Ingo
> >>
> >> Thanks for your reply.
> >>
> >> I have try use "ls -l" to see the size of sched.o, but after applied the
> >> patch, it is still 1636.
> >>
> >> I have not use this method before, may be I use the wrong command...
> >>
> >> But I think the new code should be similar to the old one after compile,
> >> because we still have 3 condition check here.
> >>
> >> I suppose the new sched.o will be a little bigger, because one jump
> >> command and a label need to be added.
> >>
> >
> > Try to see if `size` helps.
>
> Hi, Cong
>
> Thanks for your advise, but still, the size not changed.
>
> And also I don't know whether the size can be some kind of
> proof to confirm the performance improvement in this case...
You could disassemble the .o file via objdump -d and run diff on
it - is there any change in the code generated by GCC?
Thanks,
Ingo
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