linux-kernel - Re: [PATCH 02/13] perf hist: Save raw

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Date:	Thu, 24 Dec 2015 09:45:45 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 02/13] perf hist: Save raw_data/size for tracepoint events

Hi Arnaldo,

On Wed, Dec 23, 2015 at 06:43:35PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Wed, Dec 23, 2015 at 02:06:59AM +0900, Namhyung Kim escreveu:
> > The raw_data and raw_size fields are to provide tracepoint specific
> > information.  They will be used by dynamic sort keys later.
> > 
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> >  tools/perf/util/hist.c | 4 ++++
> >  tools/perf/util/sort.h | 2 ++
> >  2 files changed, 6 insertions(+)
> > 
> > diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> > index 039bb91d0a92..c0c92a3daa69 100644
> > --- a/tools/perf/util/hist.c
> > +++ b/tools/perf/util/hist.c
> > @@ -487,6 +487,8 @@ struct hist_entry *__hists__add_entry(struct hists *hists,
> >  		.branch_info = bi,
> >  		.mem_info = mi,
> >  		.transaction = sample->transaction,
> > +		.raw_data = sample->raw_data,
> > +		.raw_size = sample->raw_size,
> 
> So, sample->raw_data is just a pointer to perf_event_sample->array, that
> may be overwritten, no?

I couldn't find where the array data is overwritten.  The
__perf_session__process_events() mmaps with PROT_READ basically.  But
the mmap can be munmapped on 32 bit systems.  I'll keep a copy then.

> 
> Looking at the other patches.

Thanks,
Namhyung

> 
> - Arnaldo
> 
> >  	};
> >  
> >  	return hists__findnew_entry(hists, &entry, al, sample_self);
> > @@ -801,6 +803,8 @@ iter_add_next_cumulative_entry(struct hist_entry_iter *iter,
> >  			.sym = al->sym,
> >  		},
> >  		.parent = iter->parent,
> > +		.raw_data = sample->raw_data,
> > +		.raw_size = sample->raw_size,
> >  	};
> >  	int i;
> >  	struct callchain_cursor cursor;
> > diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
> > index 86f05e7a5566..d29898708dbd 100644
> > --- a/tools/perf/util/sort.h
> > +++ b/tools/perf/util/sort.h
> > @@ -122,6 +122,8 @@ struct hist_entry {
> >  	struct branch_info	*branch_info;
> >  	struct hists		*hists;
> >  	struct mem_info		*mem_info;
> > +	void			*raw_data;
> > +	u32			raw_size;
> >  	struct callchain_root	callchain[0]; /* must be last member */
> >  };
> >  
> > -- 
> > 2.6.4
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