linux-kernel - Re: [PATCH 6/8] perf script: Display stat events by default

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Date:	Wed, 6 Jan 2016 10:36:11 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Liang, Kan" <kan.liang@...el.com>
Subject: Re: [PATCH 6/8] perf script: Display stat events by default

On Tue, Jan 05, 2016 at 07:49:27PM -0300, Arnaldo Carvalho de Melo wrote:

SNIP

> [acme@zoo linux]$ 
> [acme@zoo linux]$ perf script
> CPU   THREAD             VAL             ENA             RUN            TIME EVENT
> 65535     4883          356474          356474          356474          690200 task-clock
> 65535     4883               1          356474          356474          690200 context-switches
> 65535     4883               0          356474          356474          690200 cpu-migrations
> 65535     4883              54          356474          356474          690200 page-faults
> 65535     4883         1044123          360329          360329          690200 cycles
> 65535     4883          716911          360329          360329          690200 stalled-cycles-frontend
> 65535     4883               0               0               0          690200 stalled-cycles-backend
> 65535     4883          694609          360329          360329          690200 instructions
> 65535     4883          140037          360329          360329          690200 branches
> 65535     4883            7920          360329          360329          690200 branch-misses
> [acme@zoo linux]$

there's wrong conversion from u16 (-1) cpu data to int cpu_map->map[0]

attached patch fixes that for me, not sure why I did
not see that before.. I'll send new version shortly

thanks,
jirka


---
diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index a0717b93d8f5..581aec244ac1 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -189,7 +189,7 @@ static struct cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
 		unsigned i;
 
 		for (i = 0; i < cpus->nr; i++)
-			map->map[i] = (int)cpus->cpu[i];
+			map->map[i] = (int)(s16)cpus->cpu[i];
 	}
 
 	return map;
--
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