linux-kernel - Re: [PATCHSET] cpuhog: implement and use cpuhog

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Message-ID: <4BB58479.9080308@kernel.org>
Date:	Fri, 02 Apr 2010 14:45:29 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	sivanich@....com, heiko.carstens@...ibm.com,
	torvalds@...ux-foundation.org, mingo@...e.hu, dipankar@...ibm.com,
	josh@...edesktop.org, paulmck@...ux.vnet.ibm.com, oleg@...hat.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCHSET] cpuhog: implement and use cpuhog

Hello, Peter.

On 03/29/2010 06:11 PM, Peter Zijlstra wrote:
> Its a pretty minor difference, shouldn't we simply audit all existing
> kstopmachine users and fix that up, having two similar but not quite
> identical interfaces in the kernel sounds like trouble.

Yeap, sure.  I don't think naming one way or the other is a problem
logistics-wise.  These aren't very widely used APIs anyway.  I've been
thinking quite a while about it and visible interface like the
following would probably fit your suggestion.

* stop_cpu()		- identical to hog_cpu()
* stop_cpus()		- identical to hog_cpus()
* stop_machine()

It's just that stop_cpu[s]() don't look like good names because they
don't really stop cpus.  This distinction is visible in
implementation.  stop_machine()'s per-cpu callback is currently named
stop_cpu() and it adds quite a bit more restrictions on top of just
hogging the cpu.  To me, the following visible API seems better.

* hog_cpu()
* hog_cpus()
* stop_machine()	- uses stop_cpu() internally for implementation

Oh well, I guess it's a matter of taste.  Given that other people
don't dislike the current naming too much, I'll try to push it forward
to Ingo w/ your objection to naming noted.

Thank you for reviewing.

-- 
tejun
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