On Mon, Oct 09, 2017 at 11:09:44AM -0300, Arnaldo Carvalho de Melo wrote:
SNIP
> [root@jouet bpf]# cat sys_read.c
> #define SEC(NAME) __attribute__((section(NAME), used))
> SEC("func=sys_read")
> int bpf_func__sys_read(void *ctx)
> {
> return 1;
> }
> char _license[] SEC("license") = "GPL";
> int _version SEC("version") = LINUX_VERSION_CODE;
> [root@jouet bpf]# perf trace --no-syscalls -e sys_read.c/max-stack=5/ sleep 1
> bpf: builtin compilation failed: -95, try external compiler
> 0.000 perf_bpf_probe:func:(ffffffffb7263190))
> sys_read ([kernel.kallsyms])
> entry_SYSCALL_64_fastpath
> ([kernel.kallsyms])
> __read (/usr/lib64/ld-2.25.so)
> _dl_map_object (/usr/lib64/ld-2.25.so)
> [root@jouet bpf]# perf trace --no-syscalls -e sys_read.c sleep 1
> bpf: builtin compilation failed: -95, try external compiler
> 0.000 perf_bpf_probe:func:(ffffffffb7263190))
> [root@jouet bpf]#
is this ok?
>
> [root@jouet bpf]# perf stat -e UOPS_EXECUTED.CORE sleep 1
>
> Performance counter stats for 'sleep 1':
>
> 1,205,347 UOPS_EXECUTED.CORE
>
>
> 1.001694225 seconds time elapsed
>
> But I noticed this problem:
>
> [root@jouet bpf]# perf stat -e
> cpu/uops_executed.core/,uops_executed.core,cpu/UOPS_EXECUTED.CORE sleep 1
> event syntax error:
> '..d=48;5;232;38;5;3:or=48;5;232;38;5;9:mi=01;05;37;41:su=48;5;196;38;5;15:sg=48;5;11;38;5;16:ca=48;5;196;38;5;226:IY�'
> \___ parser error
> Run 'perf list' for a list of valid events
>
mama mia, this looks like unhandled case of error printing.. I'll check
jirka
