linux-kernel - Re: [PATCH v3 3/3] samples/bpf: example of get selected PMU counter value

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Message-ID: <55B171EB.30203@plumgrid.com>
Date:	Thu, 23 Jul 2015 15:59:55 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Kaixu Xia <xiakaixu@...wei.com>, davem@...emloft.net,
	acme@...nel.org, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	masami.hiramatsu.pt@...achi.com, jolsa@...nel.org
Cc:	wangnan0@...wei.com, linux-kernel@...r.kernel.org,
	pi3orama@....com, hekuang@...wei.com
Subject: Re: [PATCH v3 3/3] samples/bpf: example of get selected PMU counter
 value

On 7/23/15 2:42 AM, Kaixu Xia wrote:
> This is a simple example and shows how to use the new ability
> to get the selected Hardware PMU counter value.
>
> Signed-off-by: Kaixu Xia <xiakaixu@...wei.com>
...
> +struct bpf_map_def SEC("maps") my_map = {
> +	.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
> +	.key_size = sizeof(int),
> +	.value_size = sizeof(unsigned long),
> +	.max_entries = 32,
> +};

wait. how did it work here? value_size should be u32.

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