linux-kernel - Re: [PATCH v2 0/2] perf: add support for logging debug messages to file

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Date:   Fri, 4 Oct 2019 10:35:37 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Changbin Du <changbin.du@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/2] perf: add support for logging debug messages to
 file

On Sun, Sep 29, 2019 at 09:44:07AM +0200, Jiri Olsa wrote:
> On Sun, Sep 22, 2019 at 10:38:21AM +0800, Changbin Du wrote:
> > When in TUI mode, it is impossible to show all the debug messages to
> > console. This make it hard to debug perf issues using debug messages.
> > This patch adds support for logging debug messages to file to resolve
> > this problem.
> > 
> > v2:
> >   o specific all debug options one time.
> > 
> > Changbin Du (2):
> >   perf: support multiple debug options separated by ','
> >   perf: add support for logging debug messages to file
> 
> hi,
> getting segfault with:
> 
> [jolsa@...va perf]$ ./perf --debug verbose=2,file report
> build id event received for [kernel.kallsyms]: bf6ca14c03795fd67b4d88113681ba4af2b8c18a
> Segmentation fault (core dumped)
>
Hmm, this because the va_list variable cannot be used twice. I resolve this by
making stderr and file options exclusive.

> jirka
> 
> > 
> >  tools/perf/Documentation/perf.txt |  14 ++--
> >  tools/perf/util/debug.c           | 106 ++++++++++++++++++------------
> >  2 files changed, 73 insertions(+), 47 deletions(-)
> > 
> > -- 
> > 2.20.1
> > 

-- 
Cheers,
Changbin Du