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SubjectRe: perf test BPF failing on 4.15.0-rc6
Em Thu, Jan 04, 2018 at 09:37:35AM +0800, Wangnan (F) escreveu:
>
>
> On 2018/1/4 4:13, Arnaldo Carvalho de Melo wrote:
> > Em Wed, Jan 03, 2018 at 03:33:07PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > Em Wed, Jan 03, 2018 at 03:27:01PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > > > Continuing investigation...
> > > > After applying the fallback patch to allow new tools to work with older
> > > > kernels:
> > > >
> > > > [root@felicio ~]# perf test bpf
> > > > 39: BPF filter :
> > > > 39.1: Basic BPF filtering : Ok
> > > > 39.2: BPF pinning : Ok
> > > > 39.3: BPF prologue generation : Ok
> > > > 39.4: BPF relocation checker : Ok
> > > > [root@felicio ~]# uname -a
> > > > Linux felicio.ghostprotocols.net 4.13.0-rc7+ #1 SMP Mon Sep 11 13:56:18 -03 2017 x86_64 x86_64 x86_64 GNU/Linux
> > > > [root@felicio ~]# rpm -q glibc
> > > > glibc-2.17-157.el7_3.2.x86_64
> > > > [root@felicio ~]#
> > > >
> > > > After applying the patch below I get to, which is what I am trying to
> > > > fix now:
> > > >
> > > > [root@jouet ~]# perf test bpf
> > > > 39: BPF filter :
> > > > 39.1: Basic BPF filtering : Ok
> > > > 39.2: BPF pinning : Ok
> > > > 39.3: BPF prologue generation : FAILED!
> > > > 39.4: BPF relocation checker : Skip
> > > > [root@jouet ~]#
> > > Update the patch to the one at the end of this message to make it work
> > > with older glibcs, so that we ask for epoll_pwait() and hook into that
> > > as well().
> > >
> > > Now checking why 39.3 fails...
> > Couldn't reproduce after fixing up some kernel build problems, the patch
> > below is all I need to have this working with both Fedora 27 and RHEL7,
> > please take a look and see if it continues to work on your systems,
>
> It works for me. Thank you.
>
> Since we test epoll_pwait, we'd better correct function names:

Right, that wasn't strictly needed, so I tried to restrict my changes to
focus on the fix.

Now that we agree on it, I'm doing what you suggest, to make it less
confusing.

I'm adding your Tested-by, thanks!

- Arnaldo

>
> diff --git a/tools/perf/tests/bpf-script-example.c
> b/tools/perf/tests/bpf-script-example.c
> index 268e5f8..e4123c1 100644
> --- a/tools/perf/tests/bpf-script-example.c
> +++ b/tools/perf/tests/bpf-script-example.c
> @@ -31,8 +31,8 @@ struct bpf_map_def SEC("maps") flip_table = {
> .max_entries = 1,
> };
>
> -SEC("func=SyS_epoll_wait")
> -int bpf_func__SyS_epoll_wait(void *ctx)
> +SEC("func=SyS_epoll_pwait")
> +int bpf_func__SyS_epoll_pwait(void *ctx)
> {
> int ind =0;
> int *flag = bpf_map_lookup_elem(&flip_table, &ind);
> diff --git a/tools/perf/tests/bpf.c b/tools/perf/tests/bpf.c
> index 34c22cd..a8f9095 100644
> --- a/tools/perf/tests/bpf.c
> +++ b/tools/perf/tests/bpf.c
> @@ -19,13 +19,13 @@
>
> #ifdef HAVE_LIBBPF_SUPPORT
>
> -static int epoll_wait_loop(void)
> +static int epoll_pwait_loop(void)
> {
> int i;
>
> /* Should fail NR_ITERS times */
> for (i = 0; i < NR_ITERS; i++)
> - epoll_wait(-(i + 1), NULL, 0, 0);
> + epoll_pwait(-(i + 1), NULL, 0, 0, NULL);
> return 0;
> }
>
> @@ -68,7 +68,7 @@ static struct {
> "[basic_bpf_test]",
> "fix 'perf test LLVM' first",
> "load bpf object failed",
> - &epoll_wait_loop,
> + &epoll_pwait_loop,
> (NR_ITERS + 1) / 2,
> false,
> },
> @@ -78,7 +78,7 @@ static struct {
> "[bpf_pinning]",
> "fix kbuild first",
> "check your vmlinux setting?",
> - &epoll_wait_loop,
> + &epoll_pwait_loop,
> (NR_ITERS + 1) / 2,
> true,
> },
>
>

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