linux-kernel - Re: [PATCH v4 24/25] perf tests: Support 'Convert perf time to TSC' test for hybrid

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Date:   Wed, 21 Apr 2021 20:29:16 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v4 24/25] perf tests: Support 'Convert perf time to TSC'
 test for hybrid

On Fri, Apr 16, 2021 at 10:05:16PM +0800, Jin Yao wrote:
> Since for "cycles:u' on hybrid platform, it creates two "cycles".
> So the second evsel in evlist also needs initialization.
> 
> With this patch,
> 
>   # ./perf test 71
>   71: Convert perf time to TSC                                        : Ok
> 
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> ---
>  tools/perf/tests/perf-time-to-tsc.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/tools/perf/tests/perf-time-to-tsc.c b/tools/perf/tests/perf-time-to-tsc.c
> index 680c3cffb128..72f268c6cc5d 100644
> --- a/tools/perf/tests/perf-time-to-tsc.c
> +++ b/tools/perf/tests/perf-time-to-tsc.c
> @@ -20,6 +20,7 @@
>  #include "tsc.h"
>  #include "mmap.h"
>  #include "tests.h"
> +#include "pmu.h"
>  
>  #define CHECK__(x) {				\
>  	while ((x) < 0) {			\
> @@ -66,6 +67,10 @@ int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest __maybe
>  	u64 test_tsc, comm1_tsc, comm2_tsc;
>  	u64 test_time, comm1_time = 0, comm2_time = 0;
>  	struct mmap *md;
> +	bool hybrid = false;
> +
> +	if (perf_pmu__has_hybrid())
> +		hybrid = true;
>  
>  	threads = thread_map__new(-1, getpid(), UINT_MAX);
>  	CHECK_NOT_NULL__(threads);
> @@ -88,6 +93,17 @@ int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest __maybe
>  	evsel->core.attr.disabled = 1;
>  	evsel->core.attr.enable_on_exec = 0;
>  
> +	/*
> +	 * For hybrid "cycles:u", it creates two events.
> +	 * Init the second evsel here.
> +	 */
> +	if (hybrid) {

same, don't see the reason for 'hybrid' variable

jirka

> +		evsel = evsel__next(evsel);
> +		evsel->core.attr.comm = 1;
> +		evsel->core.attr.disabled = 1;
> +		evsel->core.attr.enable_on_exec = 0;
> +	}
> +
>  	CHECK__(evlist__open(evlist));
>  
>  	CHECK__(evlist__mmap(evlist, UINT_MAX));
> -- 
> 2.17.1
>