linux-kernel - Re: [PATCH 3/3] perf test: Update ftrace test to use --graph-opts

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Message-ID: <f0828c16-8892-47c6-91ea-954101ed7dda@linaro.org>
Date: Tue, 7 Jan 2025 14:49:40 +0000
From: James Clark <james.clark@...aro.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>,
 LKML <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org,
 Thomas Richter <tmricht@...ux.ibm.com>,
 Arnaldo Carvalho de Melo <acme@...nel.org>, Ian Rogers <irogers@...gle.com>,
 Kan Liang <kan.liang@...ux.intel.com>
Subject: Re: [PATCH 3/3] perf test: Update ftrace test to use --graph-opts



On 03/01/2025 11:16 pm, Namhyung Kim wrote:
> I found it failed on machines with limited memory because 16M byte
> per-cpu buffer is too big.  The reason it added the option is not to
> miss tracing data.  Thus we can limit the data size by reducing the
> function call depth instead of increasing the buffer size to handle the
> whole data.
> 
> As it used the same option in the test_ftrace_trace() and it was able
> to find the sleep function, it should work with the profile subcommand.
> 
> Get rid of other grep commands which might be affected by the depth
> change.
> 
> Cc: Thomas Richter <tmricht@...ux.ibm.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>   tools/perf/tests/shell/ftrace.sh | 5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)
> 

Reviewed-by: James Clark <james.clark@...aro.org>

> diff --git a/tools/perf/tests/shell/ftrace.sh b/tools/perf/tests/shell/ftrace.sh
> index 2df05052c324a21c..c243731d2fbf67aa 100755
> --- a/tools/perf/tests/shell/ftrace.sh
> +++ b/tools/perf/tests/shell/ftrace.sh
> @@ -67,11 +67,8 @@ test_ftrace_latency() {
>   
>   test_ftrace_profile() {
>       echo "perf ftrace profile test"
> -    perf ftrace profile -m 16M sleep 0.1 > "${output}"
> +    perf ftrace profile --graph-opts depth=5 sleep 0.1 > "${output}"
>       grep ^# "${output}"
> -    grep sleep "${output}"
> -    grep schedule "${output}"
> -    grep execve "${output}"
>       time_re="[[:space:]]+1[[:digit:]]{5}\.[[:digit:]]{3}"
>       # 100283.000 100283.000 100283.000          1   __x64_sys_clock_nanosleep
>       # Check for one *clock_nanosleep line with a Count of just 1 that takes a bit more than 0.1 seconds