linux-kernel - [tip:perf/core] perf trace: Print the name of a syscall when failing to read its info

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Message-ID: <tip-q3ak0j8b81yxylykq5wp2uwi@git.kernel.org>
Date:	Thu, 25 Oct 2012 01:07:29 -0700
From:	tip-bot for Arnaldo Carvalho de Melo <acme@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, paulus@...ba.org,
	acme@...hat.com, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, efault@....de, namhyung@...il.com,
	jolsa@...hat.com, fweisbec@...il.com, rostedt@...dmis.org,
	dsahern@...il.com, tglx@...utronix.de
Subject: [tip:perf/core] perf trace:
  Print the name of a syscall when failing to read its info

Commit-ID:  814d7a4d2c33657489f7b45bc0b2dcaa0d88edc0
Gitweb:     http://git.kernel.org/tip/814d7a4d2c33657489f7b45bc0b2dcaa0d88edc0
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Wed, 24 Oct 2012 18:44:13 -0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 24 Oct 2012 18:44:13 -0200

perf trace: Print the name of a syscall when failing to read its info

When failing to read the tracepoint event format, like currently with
sys_execve, that is not defined via SYSCALL_DEFINE macros and thus
doesn't have an entry in:

  $ ls -d /sys/kernel/debug/tracing/events/syscalls/sys_enter_*exec*
  /sys/kernel/debug/tracing/events/syscalls/sys_enter_kexec_load
  $

Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Mike Galbraith <efault@....de>
Cc: Namhyung Kim <namhyung@...il.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
echo Link: http://lkml.kernel.org/n/tip-`ranpwd -l 24`@....kernel.org
Link: http://lkml.kernel.org/n/tip-q3ak0j8b81yxylykq5wp2uwi@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-trace.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index fb83cfe..ba05510 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -278,7 +278,10 @@ static struct syscall *trace__syscall_info(struct trace *trace,
 	return &trace->syscalls.table[id];
 
 out_cant_read:
-	printf("Problems reading syscall %d information\n", id);
+	printf("Problems reading syscall %d", id);
+	if (id <= trace->syscalls.max && trace->syscalls.table[id].name != NULL)
+		printf("(%s)", trace->syscalls.table[id].name);
+	puts(" information");
 	return NULL;
 }
 
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