linux-kernel - Re: [PATCH 1/2] perf_counter: cleanup for __perf_event_sched

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Date:	Fri, 25 Sep 2009 09:22:29 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] perf_counter: cleanup for __perf_event_sched_*()



Peter Zijlstra wrote:

> 
> Hrm.. I think its not just a cleanup, but an actual bugfix.
> 
> The intent was to call event_sched_{in,out}() for single counter groups
> because that's cheaper than group_sched_{in,out}(), however..
> 
>  - as you noticed, I got the condition wrong, it should have read:
> 
>      list_empty(&event->sibling_list)
> 
>  - it failed to call group_can_go_on() which deals with ->exclusive.
> 
>  - it also doesn't call hw_perf_group_sched_in() which might break
>    power.
> 

Yeah, I'll fix the title

> Also, I'm not sure I like the comments and WARN_ON bits, the changelog
> should be sufficient.
> 

Um, I'll remove the comments and WARN_ON_ONCE()

Thanks,
Xiao
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