Messages in this thread | | | Date | Thu, 22 Oct 2015 13:13:09 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH 04/31] perf record, bpf: Create probe points for BPF programs |
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Em Wed, Oct 21, 2015 at 10:28:03AM -0300, Arnaldo Carvalho de Melo escreveu: > Em Wed, Oct 21, 2015 at 11:31:57AM +0800, Wangnan (F) escreveu: > > >bpf: config program 'do_fork' > > >symbol:do_fork file:(null) line:0 offset:0 return:0 lazy:(null) > > >bpf: 'do_fork': event name is missing > > > > BPF report the problem, but it is a little bit hard to understand... > > > > >event syntax error: '/tmp/foo.o' > > > \___ Invalid argument > > > > > >(add -v to see detail) > > >Run 'perf list' for a list of valid events > > > > > > Usage: perf record [<options>] [<command>] > > > or: perf record [<options>] -- <command> [<options>] > > > > > > -e, --event <event> event selector. use 'perf list' to list available events > > >[root@felicio ~]# > > > > > >[root@felicio ~]# grep do_fork /proc/kallsyms > > >ffffffff81099ab0 T _do_fork > > >ffffffff81ccc800 d do_fork_test > > >[root@felicio ~]# > > > > > >$ echo '__attribute__((section("_do_fork"), used)) int fork(void *ctx) {return 0;} char _license[] __attribute__((section("license"), used)) = "GPL";int _version __attribute__((section("version"), used)) = 0x40100;' | clang -D__KERNEL__ $CLANG_OPTIONS $KERNEL_INC_OPTIONS -Wno-unused-value -Wno-pointer-sign -working-directory $WORKING_DIR -c - -target bpf -O2 -o /tmp/foo.o > > > In your program you only provide "do_fork", but we need "key=value" > > syntax. "key" will become the name of created kprobe. Please try > > "__attribute__((section("func=do_fork"), used)) " instead. > > > I think when event name is missing we'd better construct one name for > > it like perf probe, but then we need to deal with perf probe code > > again. It may require another patch. > > Nah, lets go with what we have, i.e. I'll take that into account and > test with the expected form.
So, pushed this cset with my committer testing notes:
https://git.kernel.org/cgit/linux/kernel/git/acme/linux.git/commit/?h=perf/ebpf&id=bd3c477e57233819580f5824dea3a6922a860a24
continuing...
- Arnaldo
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