linux-kernel - Re: [PATCH v1 4/6] perf: Allow using AUX data in perf samples

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Message-ID: <20180614193917.GJ12235@hirez.programming.kicks-ass.net>
Date:   Thu, 14 Jun 2018 21:39:17 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        linux-kernel@...r.kernel.org, jolsa@...hat.com
Subject: Re: [PATCH v1 4/6] perf: Allow using AUX data in perf samples

On Thu, Jun 14, 2018 at 09:25:13PM +0200, Peter Zijlstra wrote:
> On Tue, Jun 12, 2018 at 10:51:15AM +0300, Alexander Shishkin wrote:
> > @@ -882,6 +890,7 @@ struct perf_sample_data {
> >  	 */
> >  	u64				addr;
> >  	struct perf_raw_record		*raw;
> > +	struct perf_aux_record		aux;
> >  	struct perf_branch_stack	*br_stack;
> >  	u64				period;
> >  	u64				weight;
> > @@ -933,6 +942,7 @@ static inline void perf_sample_data_init(struct perf_sample_data *data,
> >  	/* remaining struct members initialized in perf_prepare_sample() */
> >  	data->addr = addr;
> >  	data->raw  = NULL;
> > +	data->aux.from = data->aux.to = data->aux.size = 0;
> >  	data->br_stack = NULL;
> >  	data->period = period;
> >  	data->weight = 0;
> 
> You just blew that cacheline...

And since the whole aux_sample thing seems to be purely prepare/output
driven, I really don't see the need why this needs to be here. AFAICT it
should just work fine in the other part of this structure.