Messages in this thread | | | Date | Mon, 3 Aug 2015 10:37:59 +0800 | From | "Wangnan (F)" <> | Subject | Re: perf eBPF patch ordering. was: Re: perf test LLVM was: Re: [GIT PULL 00/39] perf tools: filtering events using eBPF programs |
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On 2015/8/1 4:31, Arnaldo Carvalho de Melo wrote: > Em Fri, Jul 31, 2015 at 12:35:22PM -0300, Arnaldo Carvalho de Melo escreveu: >> But point here is, when I see "enable passing >> bpf object file to --event" I apply the patch and expect to be able to >> go straight away and do: > >> perf record -e foo.o sleep 1 > >> And get some informative message as to hey, yes, I managed to do what >> you asked or something is wrong, but I get: > >> [root@felicio ~]# perf record --event foo.o sleep >> event syntax error: 'foo.o' >> \___ parser error >> 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 ~]# > >> So, is it enabled or is it not? Doesn't look like. I.e. I think the best >> thing is to only expose this when it can be used. Till that time, we can > I just tried gdb'ing this with a breakpoint on parse_events_load_bpf(), > but when I run: > > (gdb) b parse_events_load_bpf > Breakpoint 1 at 0x48b11b: file util/parse-events.c, line 488. > (gdb) run record -e foo.o sleep 1 > Starting program: /root/bin/perf record -e foo.o sleep 1 > [Thread debugging using libthread_db enabled] > Using host libthread_db library "/lib64/libthread_db.so.1". > event syntax error: 'foo.o' > \___ parser error > Run 'perf list' for a list of valid events > > Somehow it is not calling what the changeset says it would call when passing > "-e foo.o", investigating...
Have you tried
/root/bin/perf record -e ./foo.o sleep 1
The key is './'.
I have reproduced the problem. Haven't noticed that because I always use './' name.
Will look into it.
Thank you, and glad to see you start looking at this cset.
> - Arnaldo
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