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

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Message-ID: <20150902124528.GA27663@danjae.kornet>
Date:	Wed, 2 Sep 2015 21:45:28 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	acme@...hat.com, mingo@...nel.org, ast@...mgrid.com,
	linux-kernel@...r.kernel.org, lizefan@...wei.com, pi3orama@....com,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	David Ahern <dsahern@...il.com>, He Kuang <hekuang@...wei.com>,
	Jiri Olsa <jolsa@...nel.org>, Kaixu Xia <xiakaixu@...wei.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 18/31] perf test: Add 'perf test BPF'

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@...wei.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Alexei Starovoitov <ast@...mgrid.com>
> Cc: Brendan Gregg <brendan.d.gregg@...il.com>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: David Ahern <dsahern@...il.com>
> Cc: He Kuang <hekuang@...wei.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Kaixu Xia <xiakaixu@...wei.com>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Zefan Li <lizefan@...wei.com>
> Cc: pi3orama@....com
> Link: http://lkml.kernel.org/n/1440151770-129878-16-git-send-email-wangnan0@huawei.com
> ---

[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


> +			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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