linux-kernel - Re: [RFC PATCH v2 1/4] bpf: Put perf

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Message-ID: <559585EC.8000203@plumgrid.com>
Date:	Thu, 02 Jul 2015 11:41:48 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	He Kuang <hekuang@...wei.com>, rostedt@...dmis.org,
	masami.hiramatsu.pt@...achi.com, acme@...nel.org,
	a.p.zijlstra@...llo.nl, mingo@...hat.com, namhyung@...nel.org,
	jolsa@...nel.org
CC:	wangnan0@...wei.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 1/4] bpf: Put perf_events check ahead of bpf prog

On 7/2/15 6:50 AM, He Kuang wrote:
> When we add a kprobe point and record events by perf, the execution path
> of all threads on each cpu will enter this point, but perf may only
> record events on a particular thread or cpu at this kprobe point, a
> check on call->perf_events list filters out the threads which perf is
> not recording.

as explained in the other thread, I don't like this patch at all.
please let discussion come to conclusion first before resending
the same stuff over and over.

btw, I'll be off-grid till Sunday due to July 4 holidays.
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