linux-kernel - Re: [PATCH v1 4/5] perf: Introduce address range filtering

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Message-ID: <87wpnl8zmv.fsf@ashishki-desk.ger.corp.intel.com>
Date:	Mon, 25 Apr 2016 18:41:12 +0300
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	vince@...ter.net, eranian@...gle.com,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: Re: [PATCH v1 4/5] perf: Introduce address range filtering

Peter Zijlstra <peterz@...radead.org> writes:

> On Fri, Apr 22, 2016 at 07:19:11PM +0300, Alexander Shishkin wrote:
>> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
>> index b717902c99..4f968d6b96 100644
>> --- a/include/linux/perf_event.h
>> +++ b/include/linux/perf_event.h
>> @@ -151,6 +151,15 @@ struct hw_perf_event {
>>  	 */
>>  	struct task_struct		*target;
>>  
>> +	/*
>> +	 * PMU would store hardware filter configuration
>> +	 * here.
>> +	 */
>> +	void				*addr_filters;
>> +
>> +	/* Last sync'ed generation of filters */
>> +	unsigned long			addr_filters_gen;
>> +
>
> should these not go in the itrace struct?

I wanted to decouple it from the whole 'itrace' thing, because I thought
it might be usable (or at least applicable) in other contexts as well,
like tracepoints, for example. Have not given it much thought yet,
though.

Regards,
--
Alex