linux-kernel - Re: [PATCH 1/3] perf test: Fix dso cache testcase

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Date:	Fri, 30 Jan 2015 14:49:22 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] perf test: Fix dso cache testcase

On Fri, Jan 30, 2015 at 11:33:27AM +0900, Namhyung Kim wrote:
> The current dso cache permits to keep dso->data.fd is open under a
> half of open file limit.  But test__dso_data_cache() sets dso_cnt to
> limit / 2 + 1 so it'll reach the limit in the loop even though the
> loop count is one less than the dso_cnt and it makes the final
> dso__data_fd() after the loop meaningless.
> 
> I guess the intention was dsos[0]->data.fd is open before the last
> open and gets closed after it.  So add an assert before the last open.
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka

> ---
>  tools/perf/tests/dso-data.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/tests/dso-data.c b/tools/perf/tests/dso-data.c
> index caaf37f079b1..22a8c428283a 100644
> --- a/tools/perf/tests/dso-data.c
> +++ b/tools/perf/tests/dso-data.c
> @@ -243,8 +243,8 @@ int test__dso_data_cache(void)
>  	limit = nr * 4;
>  	TEST_ASSERT_VAL("failed to set file limit", !set_fd_limit(limit));
>  
> -	/* and this is now our dso open FDs limit + 1 extra */
> -	dso_cnt = limit / 2 + 1;
> +	/* and this is now our dso open FDs limit */
> +	dso_cnt = limit / 2;
>  	TEST_ASSERT_VAL("failed to create dsos\n",
>  		!dsos__create(dso_cnt, TEST_FILE_SIZE));
>  
> @@ -268,7 +268,10 @@ int test__dso_data_cache(void)
>  		}
>  	}
>  
> -	/* open +1 dso over the allowed limit */
> +	/* verify the first one is already open */
> +	TEST_ASSERT_VAL("dsos[0] is not open", dsos[0]->data.fd != -1);
> +
> +	/* open +1 dso to reach the allowed limit */
>  	fd = dso__data_fd(dsos[i], &machine);
>  	TEST_ASSERT_VAL("failed to get fd", fd > 0);
>  
> -- 
> 2.2.2
> 
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