linux-kernel - Re: [PATCH 3/4] perf tools: add core support for sampling intr machine state regs

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Date:	Fri, 11 Jul 2014 10:25:12 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, acme@...hat.com, namhyung@...nel.org
Subject: Re: [PATCH 3/4] perf tools: add core support for sampling intr
 machine state regs

On Wed, Jul 09, 2014 at 12:15:58AM +0200, Stephane Eranian wrote:
> Add the infrastructure to setup, collect and report the interrupt
> machine state regs which can be captured by the kernel.
> 

SNIP

> index 8606175..00e45d1 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -626,6 +626,11 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
>  	if (opts->call_graph_enabled)
>  		perf_evsel__config_callgraph(evsel, opts);
>  
> +	if (opts->sample_intr_regs) {
> +		attr->sample_regs_intr = PERF_REGS_MASK;
> +		perf_evsel__set_sample_bit(evsel, REGS_INTR);
> +	}
> +
>  	if (target__has_cpu(&opts->target))
>  		perf_evsel__set_sample_bit(evsel, CPU);
>  
> @@ -979,6 +984,7 @@ static size_t perf_event_attr__fprintf(struct perf_event_attr *attr, FILE *fp)
>  	ret += PRINT_ATTR_X64(branch_sample_type);
>  	ret += PRINT_ATTR_X64(sample_regs_user);
>  	ret += PRINT_ATTR_U32(sample_stack_user);
> +	ret += PRINT_ATTR_X64(sample_regs_intr);
>  
>  	ret += fprintf(fp, "%.60s\n", graph_dotted_line);
>  
> @@ -1468,6 +1474,23 @@ int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
>  		array++;
>  	}
>  
> +	data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;

not necessary, data is zeroed in the top

jirka
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