linux-kernel - Re: [PATCH 01/18] perf sort: Compare addresses if no symbol info

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Date:	Wed, 18 Dec 2013 14:35:28 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arun Sharma <asharma@...com>,
	Rodrigo Campos <rodrigo@...g.com.ar>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 01/18] perf sort: Compare addresses if no symbol info

Em Wed, Dec 18, 2013 at 04:38:49PM +0100, Jiri Olsa escreveu:
> On Wed, Dec 18, 2013 at 02:21:09PM +0900, Namhyung Kim wrote:
> > From: Namhyung Kim <namhyung.kim@....com>
> > 
> > If a hist entry doesn't have symbol information, compare it with its
> > address.  Currently it only compares its level or whether it's NULL.
> > This can lead to an undesired result like an overhead exceeds 100%
> > especially when callchain accumulation is enabled by later patch.
> > 
> > Cc: Stephane Eranian <eranian@...gle.com>
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> >  tools/perf/util/sort.c | 11 ++++++++---
> >  1 file changed, 8 insertions(+), 3 deletions(-)
> > 
> > diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> > index 8b0bb1f4494a..68a4fd2f505e 100644
> > --- a/tools/perf/util/sort.c
> > +++ b/tools/perf/util/sort.c
> > @@ -161,6 +161,11 @@ struct sort_entry sort_dso = {
> >  
> >  /* --sort symbol */
> >  
> > +static int64_t _sort__addr_cmp(u64 left_ip, u64 right_ip)
> > +{
> > +	return (int64_t)(right_ip - left_ip);
> > +}
> > +
> 
> what's the reason for the leading '_' in the name?

Yeah, I'm curious as well, the convention is to only use double _ in
front of functions when it does a little less than a function of the
same name without such prefix, like locking, etc.

- Arnaldo
 
> otherwise:
> 
> Acked-by: Jiri Olsa <jolsa@...hat.com>
> 
> jirka
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