linux-kernel - Re: [PATCH V5 1/1] bpf: control events stored in PERF_EVENT_ARRAY maps trace data output when perf sampling

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Date:	Thu, 22 Oct 2015 09:56:11 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Alexei Starovoitov <ast@...mgrid.com>
CC:	xiakaixu <xiakaixu@...wei.com>, <davem@...emloft.net>,
	<acme@...nel.org>, <mingo@...hat.com>,
	<masami.hiramatsu.pt@...achi.com>, <jolsa@...nel.org>,
	<daniel@...earbox.net>, <linux-kernel@...r.kernel.org>,
	<pi3orama@....com>, <hekuang@...wei.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH V5 1/1] bpf: control events stored in PERF_EVENT_ARRAY
 maps trace data output when perf sampling

Hi Alexei,

On 2015/10/21 21:42, Wangnan (F) wrote:
>
>
> One alternative solution I can image is to attach a BPF program
> at sampling like kprobe, and return 0 if we don't want sampling
> take action. Thought?

Do you think attaching BPF programs to sampling is an acceptable idea?

Thank you.

> Actually speaking I don't like it very much
> because the principle of soft-disable is much simpler and safe, but
> if you really like it I think we can try.


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