Messages in this thread | | | Date | Mon, 26 Oct 2015 15:18:39 +0800 | From | "Wangnan (F)" <> | Subject | Re: [PATCH 05/31] perf record: Load eBPF object into kernel |
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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/1445843588-143137-1-git-send-email-wangnan0@huawei.com
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