linux-kernel - Re: [PATCH 1/5] perf annotate: Drop objdump stderr

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Date:   Sat, 9 Apr 2022 12:44:56 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     John Garry <john.garry@...wei.com>, Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        James Clark <james.clark@....com>,
        Alexandre Truong <alexandre.truong@....com>,
        German Gomez <german.gomez@....com>,
        Dave Marchevsky <davemarchevsky@...com>,
        Song Liu <songliubraving@...com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Li Huafei <lihuafei1@...wei.com>,
        Martin Liška <mliska@...e.cz>,
        William Cohen <wcohen@...hat.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Lexi Shao <shaolexi@...wei.com>,
        Remi Bernon <rbernon@...eweavers.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Denis Nikitin <denik@...omium.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 1/5] perf annotate: Drop objdump stderr

Em Thu, Apr 07, 2022 at 04:04:59PM -0700, Ian Rogers escreveu:
> If objdump writes to stderr it can block waiting for it to be read. As
> perf doesn't read stderr then progress stops with perf waiting for
> stdout output.

Thanks, applied.

- Arnaldo

 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/util/annotate.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index e4c641b240df..82cc396ef516 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -2047,6 +2047,7 @@ static int symbol__disassemble(struct symbol *sym, struct annotate_args *args)
>  	objdump_process.argv = objdump_argv;
>  	objdump_process.out = -1;
>  	objdump_process.err = -1;
> +	objdump_process.no_stderr = 1;
>  	if (start_command(&objdump_process)) {
>  		pr_err("Failure starting to run %s\n", command);
>  		err = -1;
> -- 
> 2.35.1.1178.g4f1659d476-goog

-- 

- Arnaldo