linux-kernel - [PATCH 1/1] perf annotate: Properly notify the user that vmlinux is missing

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Message-Id: <1268667813-5710-1-git-send-email-acme@infradead.org>
Date:	Mon, 15 Mar 2010 12:43:33 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	stable@...nel.org,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: [PATCH 1/1] perf annotate: Properly notify the user that vmlinux is missing

From: Arnaldo Carvalho de Melo <acme@...hat.com>

Before this patch we would not find a vmlinux, then try to pass objdump "[kernel.kallsyms]"
as the filename, it would get confused and produce no output:

[root@...pio ~]# perf annotate n_tty_write

------------------------------------------------
 Percent |      Source code & Disassembly of [kernel.kallsyms]
------------------------------------------------

Now we check that and emit meaningful warning:

[root@...pio ~]# perf annotate n_tty_write
Can't annotate n_tty_write: No vmlinux file was found in the path:
[0] vmlinux
[1] /boot/vmlinux
[2] /boot/vmlinux-2.6.34-rc1-tip+
[3] /lib/modules/2.6.34-rc1-tip+/build/vmlinux
[4] /usr/lib/debug/lib/modules/2.6.34-rc1-tip+/vmlinux
[root@...pio ~]#

This bug was introduced when we added automatic search for vmlinux, before that
time the user had to specify a vmlinux file.

Reported-by: Ingo Molnar <mingo@...e.hu>
Cc: stable@...nel.org
Cc: Frédéric Weisbecker <fweisbec@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-annotate.c |    7 +++++++
 tools/perf/util/newt.c        |    2 +-
 2 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index 6ad7148..b2ca290 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -452,6 +452,13 @@ static void annotate_sym(struct hist_entry *he)
 	if (!filename)
 		return;
 
+	if (dso->origin == DSO__ORIG_KERNEL) {
+		pr_err("Can't annotate %s: No vmlinux file was found in the "
+		       "path:\n", sym->name);
+		vmlinux_path__fprintf(stderr);
+		return;
+	}
+
 	pr_debug("%s: filename=%s, sym=%s, start=%#Lx, end=%#Lx\n", __func__,
 		 filename, sym->name, map->unmap_ip(map, sym->start),
 		 map->unmap_ip(map, sym->end));
diff --git a/tools/perf/util/newt.c b/tools/perf/util/newt.c
index 2836394..2d19e7a 100644
--- a/tools/perf/util/newt.c
+++ b/tools/perf/util/newt.c
@@ -63,7 +63,7 @@ static void hist_entry__annotate_browser(struct hist_entry *self)
 	if (self->sym == NULL)
 		return;
 
-	if (asprintf(&str, "perf annotate %s | expand", self->sym->name) < 0)
+	if (asprintf(&str, "perf annotate %s 2>&1 | expand", self->sym->name) < 0)
 		return;
 
 	fp = popen(str, "r");
-- 
1.6.2.5

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