linux-kernel - Re: [PATCH 5/7] perf top: Delay UI browser setup after initialization is done

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Date:	Thu, 10 Dec 2015 14:52:05 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH 5/7] perf top: Delay UI browser setup after
 initialization is done

Em Thu, Dec 10, 2015 at 02:43:32PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Thu, Dec 10, 2015 at 12:00:57PM +0900, Namhyung Kim escreveu:
> > Move setup_browser after all necessary initialization is done.  This
> > is to remove the browser dependency from usage_with_options() and
> > friends.
> 
> So, please try:
> 
> perf top -C 0 -p 1
> 
> So that we get a command line validation error that will cause cmd_top
> to trip this:
> 
>         status = target__validate(target);
>         if (status) {
>                 target__strerror(target, status, errbuf, BUFSIZ);
>                 ui__warning("%s\n", errbuf);
>         }
> 
> ui__warning() will emit the warning to stdio, and this message will be
> seen only after the user exits the tool:

So, this one should be enough, ack?

>From 83c5eb5124210a579f174d37af8f0ce4f21264ff Mon Sep 17 00:00:00 2001
From: Arnaldo Carvalho de Melo <acme@...hat.com>
Date: Thu, 10 Dec 2015 14:48:45 -0300
Subject: [PATCH] perf report: Do show usage message when failing to create
 cpu/thread maps

This is necessary to get rid of the browser dependency from
usage_with_options() and its friends.  Because we validate the targets
which are used to create the cpu/thread maps and inform the user about
any override performed via the chosen UI, we don't need to call the
usage routine for that.

Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/n/tip-slu7lj7buzpwgop1vo9la8ma@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-top.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 7e2e72e6d9d1..4eb9c6906219 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1279,8 +1279,10 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (target__none(target))
 		target->system_wide = true;
 
-	if (perf_evlist__create_maps(top.evlist, target) < 0)
-		usage_with_options(top_usage, options);
+	if (perf_evlist__create_maps(top.evlist, target) < 0) {
+		ui__error("Not enough memory to create thread/cpu maps\n");
+		goto out_delete_evlist;
+	}
 
 	if (!top.evlist->nr_entries &&
 	    perf_evlist__add_default(top.evlist) < 0) {
-- 
1.8.3.1

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