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

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Date:   Thu, 14 Jun 2018 21:25:13 +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 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...