linux-kernel - Re: [PATCH v3 net-next] bpf: fix bpf_perf_event

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Message-ID: <562A474E.6040401@plumgrid.com>
Date:	Fri, 23 Oct 2015 07:42:22 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>, Wang Nan <wangnan0@...wei.com>,
	He Kuang <hekuang@...wei.com>, Kaixu Xia <xiakaixu@...wei.com>,
	Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 net-next] bpf: fix bpf_perf_event_read() helper

On 10/23/15 5:03 AM, Peter Zijlstra wrote:
> So the bpf_perf_event_read() returns the count value, does this not also
> mean that returning -EINVAL here is also 'wrong'?
>
> I mean, sure an actual count value that high is unlikely, but its still
> a broken interface.

Agree. that's not pretty interface. I wish I looked at it more carefully
when it was introduced. Now it's too late to change.

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