Loading perf-pid.map files via simpleperf report

[SiRumCz]

Hi, I am having a problem loading the perf-pid.map files. According to this Doc, it is expecting these perf maps to be under either /data/local/tmp or /tmp, and I copied them to both directories. However, even that, when I run adb shell simpleperf report -i /data/local/tmp/perf.data, I still couldn't get the perf.map files to work.

What I have observed from simpleperf report is that there are lots of unknown symbols with what seems to be a symbol address, for example: unknown[+788dcac994]. When I tried to search for this 788dcac994 particular string in all of my perf-pid.map files, no match at all :-(

I also picked an address from one of my perf-pid.map, searched it from simpleperf.data, and got no match either.

Any ideas to resolve this issue? Thanks in advance!

[yabinc]

The symbol map file is picked up at the end of recording (by the simpleperf record command), not when reporting, as shown in https://cs.android.com/android/platform/superproject/main/+/main:system/extras/simpleperf/cmd_record.cpp;l=2014.

Do you have a way to provide the file while recording?

[SiRumCz]

Hi, thanks for the response, I think this makes sense, I suppose the map file should be generated at Application data folder, i.e. /data/data/<app>?

[SiRumCz]

Hi, I have tested it and it looks like it is working, I can now see all the JS symbols that were missing before.

[yabinc]

Great! The locations to search for symbol map file is documented in https://android.googlesource.com/platform/system/extras/+/master/simpleperf/doc/jit_symbols.md#symbol-map-file-location-for-application, and can be found in the source code link above.