perf probe: Fix to get ummapped symbol address on kernel
authorMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Sun, 22 Mar 2015 11:40:22 +0000 (20:40 +0900)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Tue, 24 Mar 2015 15:07:04 +0000 (12:07 -0300)
commite6d7c91c8c5ea532584056f3e8bf1643310c8ef7
tree5bd703548960732ae7f46f8763adb18621456bd9
parent228f14f2cbf481e0ec0bd0c7f947383cfa2d5167
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>
tools/perf/util/probe-event.c