Messages in this thread | | | Date | Mon, 23 Feb 2015 14:26:29 +0100 | Subject | Re: perf kernel module symbols | From | 王金浦 <> |
| |
Hi Martin,
Did you receive something useful, or figure out how to fix it, I also have same problem.
Regards, Jack
2015-02-18 15:27 GMT+01:00 Martin Sherburn <martin.sherburn@gmail.com>: > Hello, > > I'm having some trouble getting perf to load symbols for my kernel > module. If I do a system wide capture for example with "perf record -g > fp -a sleep 15" followed by "perf report | head" it tells me the > following: > > No kallsyms or vmlinux with build-id > 3b4704f9bcec1645cd1041286dd5125af061ca95 was found > [mymodule] with build id 3b4704f9bcec1645cd1041286dd5125af061ca95 not > found, continuing without symbols > > The module does show up in the list when I do "perf buildid-list", > however it is not present in "~/.debug/.build-id". I tried to manually > add it with "perf buildid-cache -a /lib/modules/`uname > -r`/extra/mymodule". However then when I do "perf report" I get a > Segmentation fault. > > I did manage to partly work-around the issue by typing "perf report > -symfs=/". I still get the error "build id not found, continuing > without symbols" but the symbols do get resolved correctly as I can > see function names rather than just hex addresses in the report. But I > still cannot annotate functions, I get the following error: > > objdump: '[mymodule]': No such file > > If I statically link my driver into the kernel instead of using > modules then everything works fine, however I'd rather not do this. I > am using perf version 3.10.40-ltsi. Any help regarding this issue > would be greatly appreciated. > > Regards, > > Martin. > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
| |