linux-kernel - Re: [PATCH 2/2] time: alarmtimer: Add the trcepoints for alarmtimer

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Message-ID: <20160921083305.24524304@gandalf.local.home>
Date:   Wed, 21 Sep 2016 08:33:05 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Baolin Wang <baolin.wang@...aro.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Ingo Molnar <mingo@...hat.com>,
        John Stultz <john.stultz@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, rtc-linux@...glegroups.com
Subject: Re: [PATCH 2/2] time: alarmtimer: Add the trcepoints for alarmtimer

On Wed, 21 Sep 2016 09:26:20 +0200 (CEST)
Thomas Gleixner <tglx@...utronix.de> wrote:

> > As suggested by Steven, change the type of RTC value to save trace buffer.  

The original code did everything just like the above but stored every
value into ints, I just said that the value could be stored in chars to
save space.

> 
> A single u64 does not take more storage space than this and it's a single
> store.

So to use rtc_tm_to_time64()? Is the work to do the calculations of the
conversion faster than a bunch of stores that are going to be in hot
cache?

-- Steve