linux-kernel - Re: [PATCH 00/16] timers/hrtimers: Minor cleanups: Part II

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Date:	Tue, 1 Apr 2014 12:32:36 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Linaro Networking <linaro-networking@...aro.org>,
	Arvind Chauhan <Arvind.Chauhan@....com>
Subject: Re: [PATCH 00/16] timers/hrtimers: Minor cleanups: Part II

On 1 April 2014 12:03, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> So here is the patch by patch analysis (With x86_64_defconfig):
>
> Initial details:
>    text   data    bss    dec    hex filename
>    7989    408      0   8397   20cd ../bx86/kernel/hrtimer.o
>
>> 73a6cd8 hrtimer: replace 'tab' with 'space' after comma ','
>> 04223a8 hrtimer: Coalesce format fragments in printk()
>> 52fac3f hrtimer: call hrtimer_set_expires_range() from hrtimer_set_expires_range_ns()
>> 535a552 hrtimer: use base->index instead of basenum in switch_hrtimer_base()
>    7989    408      0   8397   20cd ../bx86/kernel/hrtimer.o
>
>> f3a2cdd hrtimer: no need to rewrite '1' to hrtimer_hres_enabled
>    7974    408      0   8382   20be ../bx86/kernel/hrtimer.o
>
> This one actually made a smaller :)
>
>> 479d66f hrtimer: don't rewrite same value to expires_next in hrtimer_force_reprogram()
>    7990    408      0   8398   20ce ../bx86/kernel/hrtimer.o
>> 0e134df hrtimer: use base->hres_active directly instead of hrtimer_hres_active()
>    8006    408      0   8414   20de ../bx86/kernel/hrtimer.o
>
> So, reading from a per-cpu variable is efficient as compared to
> base->hres_active. In that case this patch can be dropped :)

Its a bit awkward now. When I keep this patch at this location
it exactly generates above numbers, i.e. 7990 -> 8006.

But if I revert this patch over top of all 30 commits I have, it
doesn't make a difference. Even applying it again over the
revert doesn't make a difference.

There are no other changes to the concerned routine,
retrigger_next_event() in my commits..
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