linux-kernel - Re: [PATCHSET 0/8] perf tools: Fix scalability problem on callchain merging (v5)

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Date:	Fri, 11 Oct 2013 16:04:43 -0600
From:	David Ahern <dsahern@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCHSET 0/8] perf tools: Fix scalability problem on callchain
 merging (v5)

On 10/11/13 3:51 PM, Andi Kleen wrote:
> David Ahern <dsahern@...il.com> writes:
>
>> On 10/11/13 9:11 AM, David Ahern wrote:
>>> It would be nice to fix the callchain arg handler to not attempt to
>>> process the next argument if it is not fp or dwarf.
>>
>> Specifically, something like this which maintains syntax and default
>> fp option:
>
> Yes please! This happens to me all the time too
>
> (usually I train myself to use -g --, but i still sometimes forget)
>
> It still wouldn't handle -ga, but naked -g seems to be the common case.

grrr... you're right. I ran right through that. With -ga the 'a' gets lost.

This seems to do the trick:

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 92ca541..726d2c2 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -721,7 +721,11 @@ int record_parse_callchain_opt(const struct option 
*opt,
         return 0;

     /* We specified default option if none is provided. */
-   BUG_ON(!arg);
+   if (!arg) {
+       opts->call_graph = CALLCHAIN_FP;
+       return 0;
+   }
+

     /* We need buffer that we know we can write to. */
     buf = malloc(strlen(arg) + 1);
@@ -766,8 +770,8 @@ int record_parse_callchain_opt(const struct option *opt,
                      opts->stack_dump_size);
  #endif /* HAVE_LIBUNWIND_SUPPORT */
         } else {
-           pr_err("callchain: Unknown -g option "
-                  "value: %s\n", arg);
+           opts->call_graph = CALLCHAIN_FP;
+           ret = 0;
             break;
         }

@@ -855,7 +859,7 @@ const struct option record_options[] = {
              perf_evlist__parse_mmap_pages),
     OPT_BOOLEAN(0, "group", &record.opts.group,
             "put the counters into a counter group"),
-   OPT_CALLBACK_DEFAULT('g', "call-graph", &record.opts,
+   OPT_CALLBACK_DEFAULT_NOOPT('g', "call-graph", &record.opts,
                  "mode[,dump_size]", record_callchain_help,
                  &record_parse_callchain_opt, "fp"),
     OPT_INCR('v', "verbose", &verbose,
--
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