lkml.org 
[lkml]   [2015]   [Jul]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: perf eBPF patch ordering. was: Re: perf test LLVM was: Re: [GIT PULL 00/39] perf tools: filtering events using eBPF programs
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...

- Arnaldo


\
 
 \ /
  Last update: 2015-07-31 22:41    [W:0.168 / U:0.188 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site