From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Kris Van Hees <kris.van.hees@oracle.com>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
dtrace-devel@oss.oracle.com, linux-kernel@vger.kernel.org,
mhiramat@kernel.org, acme@kernel.org, ast@kernel.org,
daniel@iogearbox.net, peterz@infradead.org
Subject: Re: [RFC PATCH 00/11] bpf, trace, dtrace: DTrace BPF program type implementation and sample use
Date: Tue, 21 May 2019 14:43:26 -0700 [thread overview]
Message-ID: <20190521214325.rr7emn5z3b7wqiiy@ast-mbp.dhcp.thefacebook.com> (raw)
In-Reply-To: <20190521173618.2ebe8c1f@gandalf.local.home>
On Tue, May 21, 2019 at 05:36:18PM -0400, Steven Rostedt wrote:
> On Tue, 21 May 2019 13:55:34 -0700
> Alexei Starovoitov <alexei.starovoitov@gmail.com> wrote:
>
> > > The reasons for these patches is because I cannot do the same with the existing
> > > implementation. Yes, I can do some of it or use some workarounds to accomplish
> > > kind of the same thing, but at the expense of not being able to do what I need
> > > to do but rather do some kind of best effort alternative. That is not the goal
> > > here.
> >
> > what you call 'workaround' other people call 'feature'.
> > The kernel community doesn't accept extra code into the kernel
> > when user space can do the same.
>
> If that was really true, all file systems would be implemented on
> FUSE ;-)
>
> I was just at a technical conference that was not Linux focused, and I
> talked to a lot of admins that said they would love to have Dtrace
> scripts working on Linux unmodified.
>
> I need to start getting more familiar with the workings of eBPF and
> then look at what Dtrace has to see where something like this can be
> achieved, but right now just NACKing patches outright isn't being
> helpful. If you are not happy with this direction, I would love to see
> conversations where Kris shows you exactly what is required (from a
> feature perspective, not an implementation one) and we come up with a
> solution.
Steve,
sounds like you've missed all prior threads.
The feedback was given to Kris it was very clear:
implement dtrace the same way as bpftrace is working with bpf.
No changes are necessary to dtrace scripts
and no kernel changes are necessary.
next prev parent reply other threads:[~2019-05-21 21:43 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-20 23:47 [RFC PATCH 00/11] bpf, trace, dtrace: DTrace BPF program type implementation and sample use Kris Van Hees
2019-05-21 17:56 ` Alexei Starovoitov
2019-05-21 18:41 ` Kris Van Hees
2019-05-21 20:55 ` Alexei Starovoitov
2019-05-21 21:36 ` Steven Rostedt
2019-05-21 21:43 ` Alexei Starovoitov [this message]
2019-05-21 21:48 ` Steven Rostedt
2019-05-22 5:23 ` Kris Van Hees
2019-05-22 20:53 ` Alexei Starovoitov
2019-05-23 5:46 ` Kris Van Hees
2019-05-23 21:13 ` Alexei Starovoitov
2019-05-23 23:02 ` Steven Rostedt
2019-05-24 0:31 ` Alexei Starovoitov
2019-05-24 1:57 ` Steven Rostedt
2019-05-24 2:08 ` Alexei Starovoitov
2019-05-24 2:40 ` Steven Rostedt
2019-05-24 5:26 ` Kris Van Hees
2019-05-24 5:10 ` Kris Van Hees
2019-05-24 4:05 ` Kris Van Hees
2019-05-24 13:28 ` Steven Rostedt
2019-05-21 21:36 ` Kris Van Hees
2019-05-21 23:26 ` Alexei Starovoitov
2019-05-22 4:12 ` Kris Van Hees
2019-05-22 20:16 ` Alexei Starovoitov
2019-05-23 5:16 ` Kris Van Hees
2019-05-23 20:28 ` Alexei Starovoitov
2019-05-30 16:15 ` Kris Van Hees
2019-05-31 15:25 ` Chris Mason
2019-06-06 20:58 ` Kris Van Hees
2019-06-18 1:25 ` Kris Van Hees
2019-06-18 1:32 ` Alexei Starovoitov
2019-06-18 1:54 ` Kris Van Hees
2019-06-18 3:01 ` Alexei Starovoitov
2019-06-18 3:19 ` Kris Van Hees
2019-05-22 14:25 ` Peter Zijlstra
2019-05-22 18:22 ` Kris Van Hees
2019-05-22 19:55 ` Alexei Starovoitov
2019-05-22 20:20 ` David Miller
2019-05-23 5:19 ` Kris Van Hees
2019-05-24 7:27 ` Peter Zijlstra
2019-05-21 20:39 ` [RFC PATCH 01/11] bpf: context casting for tail call Kris Van Hees
2019-05-21 20:39 ` [RFC PATCH 02/11] bpf: add BPF_PROG_TYPE_DTRACE Kris Van Hees
2019-05-21 20:39 ` [RFC PATCH 03/11] bpf: export proto for bpf_perf_event_output helper Kris Van Hees
[not found] ` <facilities>
2019-05-21 20:39 ` [RFC PATCH 04/11] trace: initial implementation of DTrace based on kernel Kris Van Hees
2019-05-21 20:39 ` [RFC PATCH 05/11] trace: update Kconfig and Makefile to include DTrace Kris Van Hees
[not found] ` <features>
2019-05-21 20:39 ` [RFC PATCH 06/11] dtrace: tiny userspace tool to exercise DTrace support Kris Van Hees
2019-05-21 20:39 ` [RFC PATCH 07/11] bpf: implement writable buffers in contexts Kris Van Hees
2019-05-21 20:39 ` [RFC PATCH 08/11] perf: add perf_output_begin_forward_in_page Kris Van Hees
[not found] ` <the>
[not found] ` <context>
2019-05-21 20:39 ` [RFC PATCH 09/11] bpf: mark helpers explicitly whether they may change Kris Van Hees
[not found] ` <helpers>
2019-05-21 20:39 ` [RFC PATCH 10/11] bpf: add bpf_buffer_reserve and bpf_buffer_commit Kris Van Hees
2019-05-21 20:40 ` [RFC PATCH 11/11] dtrace: make use of writable buffers in BPF Kris Van Hees
2019-05-21 20:48 ` [RFC PATCH 00/11] bpf, trace, dtrace: DTrace BPF program type implementation and sample use Kris Van Hees
2019-05-21 20:54 ` Steven Rostedt
2019-05-21 20:56 ` Alexei Starovoitov
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