From 75e4a2a6af15e956993913314ced2582b350a647 Mon Sep 17 00:00:00 2001 From: Wang Nan Date: Fri, 15 May 2015 12:14:44 +0000 Subject: [PATCH] perf probe: Load map before glob matching Commit 4c859351226c920b227fec040a3b447f0d482af3 ("perf probe: Support glob wildcards for function name") introduces a problem: # /root/perf probe kmem_cache_free Failed to find symbol kmem_cache_free in kernel Error: Failed to add events. The reason is the replacement of map__for_each_symbol_by_name() (by map__for_each_symbol()). Although their names are similar, map__for_each_symbol doesn't call map__load() and dso__sort_by_name() before searching. The missing of map__load() causes this problem because it search symbol before load dso map. This patch ensures map__load() is called before using map__for_each_symbol(). After this patch: # /root/perf probe kmem_cache_free Added new event: probe:kmem_cache_free (on kmem_cache_free%return) You can now use it in all perf tools, such as: perf record -e probe:kmem_cache_free -aR sleep 1 Signed-off-by: Wang Nan Acked-by: Masami Hiramatsu Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1431692084-46287-1-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/probe-event.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 2399dc4f6089..1faa1e67398b 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -2499,6 +2499,9 @@ static int find_probe_functions(struct map *map, char *name) struct symbol *sym; struct rb_node *tmp; + if (map__load(map, NULL) < 0) + return 0; + map__for_each_symbol(map, sym, tmp) { if (strglobmatch(sym->name, name)) found++; -- 2.20.1