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SubjectRe: [PATCH 1/3] perf tools: Set debug_peo_args and redirect_to_stderr to correct values in perf_quiet_option
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On 20/12/22 05:57, Yang Jihong wrote:
> When perf uses quiet mode, perf_quiet_option sets debug_peo_args to -1,
> and display_attr incorrectly determines the value of debug_peo_args.
> As a result, unexpected information is displayed.
>
> Before:
> # perf record --quiet -- ls > /dev/null
> ------------------------------------------------------------
> perf_event_attr:
> size 128
> { sample_period, sample_freq } 4000
> sample_type IP|TID|TIME|PERIOD
> read_format ID|LOST
> disabled 1
> inherit 1
> mmap 1
> comm 1
> freq 1
> enable_on_exec 1
> task 1
> precise_ip 3
> sample_id_all 1
> exclude_guest 1
> mmap2 1
> comm_exec 1
> ksymbol 1
> bpf_event 1
> ------------------------------------------------------------
> ...
>
> After:
> # perf record --quiet -- ls > /dev/null
> #
>
> redirect_to_stderr is a similar problem.
>
> Fixes: f78eaef0e049 ("perf tools: Allow to force redirect pr_debug to stderr.")
> Fixes: ccd26741f5e6 ("perf tool: Provide an option to print perf_event_open args and return value")
> Suggested-by: Adrian Hunter <adrian.hunter@intel.com>
> Signed-off-by: Yang Jihong <yangjihong1@huawei.com>

Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>

> ---
> tools/perf/util/debug.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/tools/perf/util/debug.c b/tools/perf/util/debug.c
> index 65e6c22f38e4..190e818a0717 100644
> --- a/tools/perf/util/debug.c
> +++ b/tools/perf/util/debug.c
> @@ -241,6 +241,10 @@ int perf_quiet_option(void)
> opt++;
> }
>
> + /* For debug variables that are used as bool types, set to 0. */
> + redirect_to_stderr = 0;
> + debug_peo_args = 0;
> +
> return 0;
> }
>

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