Masami, On Tue, 20 Sep 2016, Masami Hiramatsu wrote: > Hmm, could you try to find mangled symbol from the library as below? > > ./perf probe -x /usr/lib64/libstdc++.so.6 -F \* > > And also try to do adding probe with -v option again? > > In my case, I could find the mangled symbol, but failed to setup the probe...
./perf probe -x /usr/lib/x86_64-linux-gnu/libstdc++.so.6 -v _X_ZNKSt13basic_fstreamIcSt11char_traitsIcEE7is_openEv probe-definition(0): _X_ZNKSt13basic_fstreamIcSt11char_traitsIcEE7is_openEv symbol:_X_ZNKSt13basic_fstreamIcSt11char_traitsIcEE7is_openEv file:(null) line:0 offset:0 return:0 lazy:(null) 0 arguments symbol:catch file:(null) line:0 offset:0 return:0 lazy:(null) symbol:throw file:(null) line:0 offset:0 return:0 lazy:(null) symbol:rethrow file:(null) line:0 offset:0 return:0 lazy:(null) Open Debuginfo file: /usr/lib/debug/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.22 Try to find probe point from debuginfo. Symbol _X_ZNKSt13basic_fstreamIcSt11char_traitsIcEE7is_openEv address found : 8c620 Matched function: is_open found inline addr: 0x8cad0 Probe point found: is_open+0 found inline addr: 0x8cac0 Probe point found: is_open+0 found inline addr: 0x8cab0 Probe point found: is_open+0 Matched function: is_open An error occurred in debuginfo analysis (-2). Trying to use symbols. Opening /sys/kernel/tracing//uprobe_events write=1 Writing event: p:probe_libstdc++/_X_ZNKSt13basic_fstreamIcSt11char_traitsIcEE7is_openEv /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.22:0x8c620 Failed to write event: Invalid argument Error: Failed to add events. Reason: Invalid argument (Code: -22) [16568.176464] Failed to allocate trace_uprobe.(-22) [16568.176468] Failed to parse address or file. Aside of that mangled symbols with a @plt suffix do not work at all. Thanks, tglx