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

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Date:	Tue, 29 Dec 2009 11:49:14 +0100
From:	Stijn Devriendt <highguy@...il.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.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

> '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.

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.

Regards,
Stijn
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