Messages in this thread | | | Date | Fri, 23 Oct 2015 13:58:40 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH 05/31] perf record: Load eBPF object into kernel |
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Em Wed, Oct 14, 2015 at 12:41:16PM +0000, Wang Nan escreveu: > This patch utilizes bpf_object__load() provided by libbpf to load all > objects into kernel.
So, testing this, using that other proggie, I get;
# perf record --event /tmp/foo.o sleep 1 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' 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
But:
[root@felicio ~]# grep -i bpf /proc/kallsyms | wc -l 117 [root@felicio ~]# grep -i sys_bpf /proc/kallsyms ffffffff811829d0 T SyS_bpf ffffffff811829d0 T sys_bpf [root@felicio ~]# uname -a Linux felicio.ghostprotocols.net 4.2.0 #1 SMP Mon Aug 31 12:25:38 BRT 2015 x86_64 x86_64 x86_64 GNU/Linux [root@felicio ~]#
I'll try updating it to torvalds/master...
For reference, that foo.o eBPF proggie was built with:
[acme@felicio linux]$ cat ~/bin/hello-ebpf # Taken from 'perf test LLVM' # Thu Oct 22 12:07:26 BRT 2015
export KERNEL_INC_OPTIONS="-nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.8.3/include -I/home/acme/git/linux/arch/x86/include -Iarch/x86/include/generated/uapi -Iarch/x86/include/generated -I/home/acme/git/linux/include -Iinclude -I/home/acme/git/linux/arch/x86/include/uapi -Iarch/x86/include/generated/uapi -I/home/acme/git/linux/include/uapi -Iinclude/generated/uapi -include /home/acme/git/linux/include/linux/kconfig.h" export WORKING_DIR=/lib/modules/4.2.0/build export CLANG_SOURCE=- export CLANG_OPTIONS=-xc
OBJ=/tmp/foo.o rm -f $OBJ echo '__attribute__((section("fork=_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 $WORKING_DIR -c "$CLANG_SOURCE" -target bpf -O2 -o /tmp/foo.o && file $OBJ
- Arnaldo
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