On 12/04/2017 08:55 AM, Arnaldo Carvalho de Melo wrote:

Em Mon, Dec 04, 2017 at 09:36:19PM +0900, Masami Hiramatsu escreveu:

quoted

On Fri, 1 Dec 2017 13:40:39 -0300
Arnaldo Carvalho de Melo [off-list ref] wrote:

quoted

Adding Masami to the CC list, to see if he can come up with a fix for
the 'perf probe' failure below, improving the message or ignoring
versioned symbols (with a warning perhaps).

Thanks. Should we ignore the versioned symbols? or can we put a probe
on that? If we have symbol address, we can put a probe on it, even
if it is versioned.

Lemme try...

[root@jouet ~]# perf probe -x /usr/lib64/libc-2.25.so malloc_get_state_225=malloc_get_state@GLIBC_2.2.5
The /usr/lib64/libc-2.25.so file has no debug information.
Rebuild with -g, or install an appropriate debuginfo package.
  Error: Failed to add events.
[root@jouet ~]# perf probe -x /usr/lib64/libc-2.25.so malloc_get_state@GLIBC_2.2.5
The /usr/lib64/libc-2.25.so file has no debug information.
Rebuild with -g, or install an appropriate debuginfo package.
  Error: Failed to add events.

commit d80406453ad4a69932dc17a617d5b7bc7ae80b8f should have allowed adding probes on versioned symbols if you omit the versioning part of the symbol.  So, in the above example, this should work:

# perf probe -x /usr/lib64/libc-2.25.so malloc_get_state

PC