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

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Message-ID: <1262165789.7135.170.camel@laptop>
Date:	Wed, 30 Dec 2009 10:36:29 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	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

On Wed, 2009-12-30 at 10:28 +0100, Ingo Molnar wrote:
> * Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > On Tue, 2009-12-29 at 13:21 +0800, Xiao Guangrong wrote:
> > > 'inject' event is a very useful feature and it's suggested by Ingo
> > > [ See http://lkml.org/lkml/2009/12/28/31 ]
> > 
> > I really dislike the name, event injection to me would be like a write() 
> > interface where you provide the actual event data to be stuffed in the 
> > output stream.
> > 
> > This just seems like a very weird way of getting data out. A kind of like 
> > sysconf() but done very strange.
> 
> What kind of API would you suggest?

sysconf() seems ideal for getting single, mostly constant variables out
of the kernel, we already have non POSIX (read Linux specific) names in
there.

_SC_KERNEL_RELOCATION_OFFSET
_SC_KERNEL_HZ

or somethings like that comes to mind.

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