linux-kernel - Re: [RFC PATCH v6 00/32] perf tools: filtering events using eBPF programs

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Date:	Tue, 9 Jun 2015 18:44:36 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Wang Nan <wangnan0@...wei.com>, brendan.d.gregg@...il.com,
	daniel@...earbox.net, namhyung@...nel.org,
	masami.hiramatsu.pt@...achi.com, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, mingo@...hat.com, jolsa@...nel.org,
	dsahern@...il.com, linux-kernel@...r.kernel.org,
	lizefan@...wei.com, hekuang@...wei.com, xiakaixu@...wei.com,
	pi3orama@....com
Subject: Re: [RFC PATCH v6 00/32] perf tools: filtering events using eBPF
 programs

Em Tue, Jun 09, 2015 at 02:30:36PM -0700, Alexei Starovoitov escreveu:
> 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.

Cool stuff, but please leave us without daemons, we've exorcised from
day one ;-)

- Arnaldo
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