linux-kernel - Re: [PATCH v3 1/5] perf_event: introduce 'inject' event and get HZ

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Message-ID: <4B39E93D.60605@cn.fujitsu.com>
Date:	Tue, 29 Dec 2009 19:34:21 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Stijn Devriendt <highguy@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul Mackerras <paulus@...ba.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/5] perf_event: introduce 'inject' event and get HZ



Stijn Devriendt wrote:
>> 'inject' event is a very useful feature and it's suggested by Ingo
>> [ See http://lkml.org/lkml/2009/12/28/31 ]
> 
> Is it possible to, instead of injecting a specific inject_event enum,
> pass a type/config pair (+task/cpu?) to inject the value of that
> specific event? Then the HZ could have it's own perf_event type.
> 

Until now, 'inject' event just trigger parameter/query events, if
you need sample cpu/task, you can use other event.

> This integrates better with what I'm struggling with right now:
> counters that are not ever incrementing but rather indicate
> a discrete value inside the kernel that might change both
> up and down. My dynticks knowledge is rather limited but
> if HZ might vary then this approach is definately worth it.
> 

dynticks not touch HZ at all as i know.

Thanks,
Xiao
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