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authorMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>2015-03-22 20:40:22 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-03-24 12:07:04 -0300
commite6d7c91c8c5ea532584056f3e8bf1643310c8ef7 (patch)
tree5bd703548960732ae7f46f8763adb18621456bd9 /tools
parent228f14f2cbf481e0ec0bd0c7f947383cfa2d5167 (diff)
downloadop-kernel-dev-e6d7c91c8c5ea532584056f3e8bf1643310c8ef7.zip
op-kernel-dev-e6d7c91c8c5ea532584056f3e8bf1643310c8ef7.tar.gz
perf probe: Fix to get ummapped symbol address on kernel
Fix to get correctly unmapped symbol address on kernel. This allows us to probe on syscall symbols which are aliases of SyS_ functions with using debuginfo. Without this fix: ---- # ./perf probe -a sys_write Failed to find debug information for address 3b0100 Probe point 'sys_write' not found. Error: Failed to add events. ---- The address 0x3b0100 is a mapped address, and not usable in debuginfo. With this fix: ---- # ./perf probe -a sys_write Added new event: probe:sys_write (on sys_write) You can now use it in all perf tools, such as: perf record -e probe:sys_write -aR sleep 1 ---- Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: He Kuang <hekuang@huawei.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/20150322114022.32639.19096.stgit@localhost.localdomain Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/probe-event.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 6b95985..8feac07 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -310,7 +310,10 @@ static int find_alternative_probe_point(struct debuginfo *dinfo,
/* Find the address of given function */
map__for_each_symbol_by_name(map, pp->function, sym) {
- address = sym->start;
+ if (uprobes)
+ address = sym->start;
+ else
+ address = map->unmap_ip(map, sym->start);
break;
}
if (!address) {
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