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Date:   Thu, 24 Oct 2019 15:52:04 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@redhat.com>,
        Ingo Molnar <mingo@redhat.com>, linux-kernel@vger.kernel.org,
        jolsa@redhat.com, adrian.hunter@intel.com,
        mathieu.poirier@linaro.org, mark.rutland@arm.com
Subject: Re: [PATCH v2 1/4] perf: Allow using AUX data in perf samples
Message-ID: <20191024135204.GD4114@hirez.programming.kicks-ass.net>
References: <20191022095812.67071-1-alexander.shishkin@linux.intel.com>
 <20191022095812.67071-2-alexander.shishkin@linux.intel.com>
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On Tue, Oct 22, 2019 at 12:58:09PM +0300, Alexander Shishkin wrote:

> @@ -964,6 +979,7 @@ struct perf_sample_data {
>  		u32	reserved;
>  	}				cpu_entry;
>  	struct perf_callchain_entry	*callchain;
> +	u64				aux_size;
>  
>  	/*
>  	 * regs_user may point to task_pt_regs or to regs_user_copy, depending
> @@ -996,6 +1012,7 @@ static inline void perf_sample_data_init(struct perf_sample_data *data,
>  	data->weight = 0;
>  	data->data_src.val = PERF_MEM_NA;
>  	data->txn = 0;
> +	data->aux_size = 0;
>  }
>  

That is really sad; so far we've managed to only touch a single
cacheline there, you just wrecked that.