Message-ID: <559585EC.8000203@plumgrid.com>
Date: Thu, 02 Jul 2015 11:41:48 -0700
From: Alexei Starovoitov <ast@plumgrid.com>
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To: He Kuang <hekuang@huawei.com>, rostedt@goodmis.org,
        masami.hiramatsu.pt@hitachi.com, acme@kernel.org,
        a.p.zijlstra@chello.nl, mingo@redhat.com, namhyung@kernel.org,
        jolsa@kernel.org
CC: wangnan0@huawei.com, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v2 1/4] bpf: Put perf_events check ahead of bpf prog
References: <559386D7.1020208@huawei.com> <1435845043-107196-1-git-send-email-hekuang@huawei.com> <1435845043-107196-2-git-send-email-hekuang@huawei.com>
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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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