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

Arnaldo Carvalho de Melo
2015-06-09T21:44:48Z

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