Re: [PATCH] PERF(kernel): Cleanup power events V2

Pierre Tardy
2010-10-26T18:15:32Z

On Tue, Oct 26, 2010 at 12:58 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> On Tue, 2010-10-26 at 11:56 -0500, Pierre Tardy wrote:
>>
>> +       trace_runtime_pm_usage(dev, atomic_read(&dev->power.usage_count)+1);
>>         atomic_inc(&dev->power.usage_count);
>
> That's terribly racy..
>
I know. I'm not proud of this.. As I said, this is preliminary patch.
We dont really need to have this prev_usage. This is just for debug.
It mayprobably endup with something like:

atomic_inc(&dev->power.usage_count);
+ trace_power_device_usage(dev);

--
Pierre
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