linux-kernel - Re: [PATCH 5.0 05/93] perf data: Dont store auxtrace index for directory data file

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Date:   Sat, 20 Apr 2019 10:48:18 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Thomas Backlund <tmb@...eia.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Jiri Olsa <jolsa@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Stephane Eranian <eranian@...gle.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 5.0 05/93] perf data: Dont store auxtrace index for
 directory data file

On Fri, Apr 19, 2019 at 09:25:27AM -0400, Sasha Levin wrote:
> On Thu, Apr 18, 2019 at 10:28:47PM +0300, Thomas Backlund wrote:
> > Den 18-04-2019 kl. 20:56, skrev Greg Kroah-Hartman:
> > > [ Upstream commit cd3dd8dd8ff62374d90cb3f2e54b8c94106c7810 ]
> > > 
> > > We can't store the auxtrace index when we store into multiple files,
> > > because we keep only offset for it, not the file.
> > > 
> > > The auxtrace data will be processed correctly in the 'pipe' mode.
> > > 
> > > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > > Cc: Adrian Hunter <adrian.hunter@...el.com>
> > > Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> > > Cc: Alexey Budankov <alexey.budankov@...ux.intel.com>
> > > Cc: Andi Kleen <ak@...ux.intel.com>
> > > Cc: Namhyung Kim <namhyung@...nel.org>
> > > Cc: Peter Zijlstra <peterz@...radead.org>
> > > Cc: Stephane Eranian <eranian@...gle.com>
> > > Link: http://lkml.kernel.org/r/20190308134745.5057-3-jolsa@kernel.org
> > > Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> > > Signed-off-by: Sasha Levin <sashal@...nel.org>
> > > ---
> > >  tools/perf/builtin-record.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> > > index 882285fb9f64..3fd154f1701b 100644
> > > --- a/tools/perf/builtin-record.c
> > > +++ b/tools/perf/builtin-record.c
> > > @@ -386,7 +386,7 @@ static int record__process_auxtrace(struct perf_tool *tool,
> > >  	size_t padding;
> > >  	u8 pad[8] = {0};
> > > -	if (!perf_data__is_pipe(data)) {
> > > +	if (!perf_data__is_pipe(data) && !perf_data__is_dir(data)) {
> > >  		off_t file_offset;
> > >  		int fd = perf_data__fd(data);
> > >  		int err;
> > > 
> > 
> > 
> > This breaks the build with:
> > 
> > builtin-record.c: In function 'record__process_auxtrace':
> > builtin-record.c:389:36: warning: implicit declaration of function
> > 'perf_data__is_dir'; did you mean 'perf_data__is_pipe'?
> > [-Wimplicit-function-declaration]
> >  if (!perf_data__is_pipe(data) && !perf_data__is_dir(data)) {
> >                                    ^~~~~~~~~~~~~~~~~
> > 
> > Looks like it depends atleast on:
> > 
> > commit ec65def1045e4c7817b7f741a86dadae82877a93
> > Author: Jiri Olsa <jolsa@...nel.org>
> > Date:   Fri Mar 8 14:47:35 2019 +0100
> > 
> >    perf data: Support having perf.data stored as a directory
> > 
> > 
> > Maybe better to drop it.
> 
> I've dropped it, thanks!

yes, no harm to drop this one if the perf_data__is_dir is not backported

jirka