linux-kernel - [PATCH] perf tools: Improve message about missing symtabs for deleted DSOs

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Date:	Fri, 30 Oct 2009 16:28:25 -0200
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>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	Mike Galbraith <efault@....de>
Subject: [PATCH] perf tools: Improve message about missing symtabs for deleted DSOs

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

Instead of:

no symbols found in /usr/lib/gstreamer-0.10/libgsttypefindfunctions.so (deleted), maybe install a debug package?
no symbols found in /usr/lib/gstreamer-0.10/libgstaudioconvert.so (deleted), maybe install a debug package?

We now emit:

/usr/lib/gstreamer-0.10/libgsttypefindfunctions.so was updated, restart the long running apps that use it!
/usr/lib/gstreamer-0.10/libgstaudioconvert.so was updated, restart the long running apps that use it!

Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Mike Galbraith <efault@....de>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/map.c |   16 ++++++++++++++--
 1 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 679011c..f1e2169 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -75,6 +75,8 @@ out_delete:
 	return NULL;
 }
 
+#define DSO__DELETED "(deleted)"
+
 struct symbol *
 map__find_symbol(struct map *self, u64 ip, symbol_filter_t filter)
 {
@@ -86,8 +88,18 @@ map__find_symbol(struct map *self, u64 ip, symbol_filter_t filter)
 				   self->dso->long_name);
 			return NULL;
 		} else if (nr == 0) {
-			pr_warning("No symbols found in %s, maybe install a debug package?\n",
-				   self->dso->long_name);
+			const char *name = self->dso->long_name;
+			const size_t len = strlen(name);
+			const size_t real_len = len - sizeof(DSO__DELETED);
+
+			if (len > sizeof(DSO__DELETED) &&
+			    strcmp(name + real_len + 1, DSO__DELETED) == 0)
+				pr_warning("%.*s was updated, restart the "
+					   "long running apps that use it!\n",
+					   real_len, name);
+			else
+				pr_warning("no symbols found in %s, maybe "
+					   "install a debug package?\n", name);
 			return NULL;
 		}
 	}
-- 
1.6.2.5

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