Message-ID: <55775AFC.7000408@plumgrid.com>
Date: Tue, 09 Jun 2015 14:30:36 -0700
From: Alexei Starovoitov <ast@plumgrid.com>
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To: Wang Nan <wangnan0@huawei.com>, acme@kernel.org, brendan.d.gregg@gmail.com,
        daniel@iogearbox.net, namhyung@kernel.org,
        masami.hiramatsu.pt@hitachi.com, paulus@samba.org,
        a.p.zijlstra@chello.nl, mingo@redhat.com, jolsa@kernel.org,
        dsahern@gmail.com
CC: linux-kernel@vger.kernel.org, lizefan@huawei.com, hekuang@huawei.com,
        xiakaixu@huawei.com, pi3orama@163.com
Subject: Re: [RFC PATCH v6 00/32] perf tools: filtering events using eBPF
 programs
References: <1433829036-23687-1-git-send-email-wangnan0@huawei.com>
In-Reply-To: <1433829036-23687-1-git-send-email-wangnan0@huawei.com>
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On 6/8/15 10:50 PM, Wang Nan wrote:
>     # perf record --event lock_page.c ls /
>     Added new event:
>       perf_bpf_probe:lock_page (on __lock_page)
>
>     You can now use it in all perf tools, such as:

agree with Arnaldo. The output is misleading.
All these events will disappear when 'perf record' is over.
Please trim it.

btw we've been thinking how to make truly global programs
and maps, so that they can be used in 'perf probe' interface.
Right now in 'tc' we're using bpf_agent. It's a user space
demon that keeps prog_fd and map_fds and passes them to other
apps via scm_rights.
We've started experimenting with fuse for this purpose as well,
but that's similar user space demon and not very convenient
for perf to talk to such fuse.
The work in that area is still very rough, just fyi.

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