linux-kernel - Re: [RFC] [PATCH 1/1] hrtimers: Cache next hrtimer

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Date:	Fri, 28 Aug 2009 20:19:12 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Ashwin Chaugule <ashwinc@...eaurora.org>
cc:	linux-kernel@...r.kernel.org, mingo@...hat.com
Subject: Re: [RFC] [PATCH 1/1] hrtimers: Cache next hrtimer

On Fri, 28 Aug 2009, Ashwin Chaugule wrote:
> Thomas Gleixner wrote:
> Avg startup time 26.4 (10 runs) same as last run.
> 
> total_calls is again equal to cache_hits ... Its been a while since I wrote my
> patch. I'll need to look deeper to see if I've done something more. B)
> Just to make sure, I ran my patch again, I clearly see cache_hits is always
> less than total_calls.

Hmm. I'd really like to know why that's behaving different. 

Usually there are only timers in the CLOCK_MONOTONIC base during
boot. CLOCK_REALTIME base should be empty most of the time. If my
theory is correct then the number of reprogram events is correct as
well because base[MONOTONIC]->first is always the one which armed the
timer.

Can you add some debug which tells us to which base the removed timer
belongs ?

Thanks,

	tglx
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