linux-kernel - Re: [PATCH v1 2/3] perf tests bp_account: Add dedicated checking helper is

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Date:   Fri, 18 Oct 2019 14:57:21 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Mark Rutland <mark.rutland@....com>, Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Brajeswar Ghosh <brajeswar.linux@...il.com>,
        Souptick Joarder <jrdr.linux@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Song Liu <songliubraving@...com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/3] perf tests bp_account: Add dedicated checking
 helper is_supported()

Em Fri, Oct 18, 2019 at 04:55:30PM +0800, Leo Yan escreveu:
> Arm architecture supports the breakpoint accounting but it doesn't
> support breakpoint overflow signal handling.  The current code uses the
> same checking helper, thus it disables both testings (bp_account and
> bp_signal) for arm platform.
> 
> For handling two testings separately, this patch adds a dedicated
> checking helper is_supported() for breakpoint accounting testing, thus
> it allows supporting breakpoint accounting testing on arm platform; the
> old helper test__bp_signal_is_supported() is only used to checking for
> breakpoint overflow signal testing.

Looks sensible,

Applied, thanks.

- Arnaldo
 
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> ---
>  tools/perf/tests/bp_account.c   | 16 ++++++++++++++++
>  tools/perf/tests/builtin-test.c |  2 +-
>  tools/perf/tests/tests.h        |  1 +
>  3 files changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/tests/bp_account.c b/tools/perf/tests/bp_account.c
> index 52ff7a462670..d0b935356274 100644
> --- a/tools/perf/tests/bp_account.c
> +++ b/tools/perf/tests/bp_account.c
> @@ -188,3 +188,19 @@ int test__bp_accounting(struct test *test __maybe_unused, int subtest __maybe_un
>  
>  	return bp_accounting(wp_cnt, share);
>  }
> +
> +bool test__bp_account_is_supported(void)
> +{
> +	/*
> +	 * PowerPC and S390 do not support creation of instruction
> +	 * breakpoints using the perf_event interface.
> +	 *
> +	 * Just disable the test for these architectures until these
> +	 * issues are resolved.
> +	 */
> +#if defined(__powerpc__) || defined(__s390x__)
> +	return false;
> +#else
> +	return true;
> +#endif
> +}
> diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
> index 55774baffc2a..8b286e9b7549 100644
> --- a/tools/perf/tests/builtin-test.c
> +++ b/tools/perf/tests/builtin-test.c
> @@ -121,7 +121,7 @@ static struct test generic_tests[] = {
>  	{
>  		.desc = "Breakpoint accounting",
>  		.func = test__bp_accounting,
> -		.is_supported = test__bp_signal_is_supported,
> +		.is_supported = test__bp_account_is_supported,
>  	},
>  	{
>  		.desc = "Watchpoint",
> diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
> index 72912eb473cb..9837b6e93023 100644
> --- a/tools/perf/tests/tests.h
> +++ b/tools/perf/tests/tests.h
> @@ -111,6 +111,7 @@ int test__map_groups__merge_in(struct test *t, int subtest);
>  int test__time_utils(struct test *t, int subtest);
>  
>  bool test__bp_signal_is_supported(void);
> +bool test__bp_account_is_supported(void);
>  bool test__wp_is_supported(void);
>  
>  #if defined(__arm__) || defined(__aarch64__)
> -- 
> 2.17.1

-- 

- Arnaldo