linux-kernel - timer/hrtimer: how do they work

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Message-ID: <436250.99909.qm@web4212.mail.ogk.yahoo.co.jp>
Date:	Thu, 20 May 2010 00:54:01 +0900 (JST)
From:	Round Robinjp <roundrobinjp@...oo.co.jp>
To:	linux-kernel@...r.kernel.org
Subject: timer/hrtimer: how do they work

Hi

I am trying to understand how timer/hrtimer work.
I am not yet clear about the following points. Please help.

I understand that there are two types of timer queues:
   - timer wheel
   - hrtimer

I also understand that there are separate sets of APIs
for adding and removing timers into those queues.

Now I want to  understand:
   - when and how the timers are armed
   - how are they processed when fired

When and how the timers are armed:

For hrtimers, it seems that they are armed in hrtimer_interrupt.
Where are the timer wheel timers armed?

How are they processed when fired:

For hrtimers, it seems that they are processed in hrtimer_run_queues.
Where are the timer wheel timers processed?

Is there any doc or something which may help me understand
the call sequence of the related source code?

Thanks
RR

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