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

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Message-ID: <20151025092142.GB4380@gmail.com>
Date:	Sun, 25 Oct 2015 10:21:43 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"David S. Miller" <davem@...emloft.net>,
	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


* Alexei Starovoitov <ast@...mgrid.com> wrote:

> 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.

So I really, really think eBPF needs to have an easy to use mechanism to phase out 
old ABI components and introducing new (better) ones!

Then old crap can be de-emphasised and eventually removed, instead of having to 
live with crap forever ...

Thanks,

	Ingo
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