Re: [PATCH 18/31] perf test: Add 'perf test BPF'

[Wang Nan]

On 09/02/2015 08:45 PM, Namhyung Kim wrote:
> On Sat, Aug 29, 2015 at 04:21:52AM +0000, Wang Nan wrote:
> > This patch adds BPF testcase for testing BPF event filtering.
> >
> > By utilizing the result of 'perf test LLVM', this patch compiles the
> > eBPF sample program then test it ability. The BPF script in 'perf test
> > LLVM' collects half of execution of epoll_pwait(). This patch runs 111
> > times of it, so the resule should contains 56 samples.
> >
> > Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
> > Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> > Cc: Alexei Starovoitov <ast@xxxxxxxxxxxx>
> > Cc: Brendan Gregg <brendan.d.gregg@xxxxxxxxx>
> > Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
> > Cc: David Ahern <dsahern@xxxxxxxxx>
> > Cc: He Kuang <hekuang@xxxxxxxxxx>
> > Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
> > Cc: Kaixu Xia <xiakaixu@xxxxxxxxxx>
> > Cc: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
> > Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
> > Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> > Cc: Zefan Li <lizefan@xxxxxxxxxx>
> > Cc: pi3orama@xxxxxxx
> > Link: http://lkml.kernel.org/n/1440151770-129878-16-git-send-email-wangnan0@xxxxxxxxxx
> > ---
>
> [SNIP]
>
> > +static int prepare_bpf(void *obj_buf, size_t obj_buf_sz)
> > +{
> > +	int err;
> > +	char errbuf[BUFSIZ];
> > +
> > +	err = bpf__prepare_load_buffer(obj_buf, obj_buf_sz, NULL);
> > +	if (err) {
> > +		bpf__strerror_prepare_load("[buffer]", false, err, errbuf,
> > +					   sizeof(errbuf));
> > +		fprintf(stderr, " (%s)", errbuf);
> > +		return TEST_FAIL;
> > +	}
> > +
> > +	err = bpf__probe();
> > +	if (err) {
> > +		bpf__strerror_load(err, errbuf, sizeof(errbuf));
> > +		fprintf(stderr, " (%s)", errbuf);
> > +		if (getuid() != 0)
>
> geteuid() ?
>
> Thanks,
> Namhyung

Already changed.

Thank you.

> > +			fprintf(stderr, " (try run as root)");
> > +		return TEST_FAIL;
> > +	}
> > +
> > +	err = bpf__load();
> > +	if (err) {
> > +		bpf__strerror_load(err, errbuf, sizeof(errbuf));
> > +		fprintf(stderr, " (%s)", errbuf);
> > +		return TEST_FAIL;
> > +	}
> > +
> > +	return 0;
> > +}

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