Hi Arnaldo,
On 2015/10/24 8:27, Arnaldo Carvalho de Melo wrote:
libbpf: load bpf program failed: Invalid argument
libbpf: -- BEGIN DUMP LOG ---
libbpf:
libbpf: -- END LOG --
libbpf: failed to load program 'fork=_do_fork'
libbpf: failed to load object '/tmp/foo.o'
bpf: load objects failed
event syntax error: '/tmp/foo.o'
\___ Invalid argument: Are you root and runing a
CONFIG_BPF_SYSCALL kernel?
(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
Opening /sys/kernel/debug/tracing//kprobe_events write=1
Opening /sys/kernel/debug/tracing//uprobe_events write=1
Parsing probe_events: p:perf_bpf_probe/fork _text+638512
Group:perf_bpf_probe Event:fork probe:p
Writing event: -:perf_bpf_probe/fork
[acme@felicio linux]$ uname -a
Linux felicio.ghostprotocols.net 4.3.0-rc6+ #1 SMP Fri Oct 23 16:40:25 BRT 2015
x86_64 x86_64 x86_64 GNU/Linux
[acme@felicio linux]$
Please have a look at patch [1]. With that patch kernel will dump
something into
log buffer. In your case, you will see:
root@sandybridge:~# /tmp/perf record -e /tmp/test_config_base.o ls
libbpf: load bpf program failed: Invalid argument
libbpf: -- BEGIN DUMP LOG ---
libbpf:
Kernel version mismatch: 0x40400 != 0x40300
libbpf: -- END LOG --
libbpf: failed to load program 'func_write=sys_write'
libbpf: failed to load object '/tmp/test_config_base.o'
event syntax error: '/tmp/test_config_base.o'
\___ Invalid argument: Are you root and runing a
CONFIG_BPF_SYSCALL kernel?
(add -v to see detail)
Run 'perf list' for a list of valid events
...
And I'd like to improve the error message output by perf.
Do you want me to send a patch for fixing this problem or modifying
existing patches
in my git tree?
Thank you.
[1]
http://lkml.kernel.org/r/[email protected]
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