linux-kernel - Re: [PATCH bpf-next 0/5] bpf, tracing: introduce bpf raw tracepoints

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Date:   Tue, 6 Mar 2018 11:35:31 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Alexei Starovoitov <ast@...nel.org>, davem@...emloft.net,
        torvalds@...ux-foundation.org, mingo@...nel.org,
        rostedt@...dmis.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com,
        linux-api@...r.kernel.org
Subject: Re: [PATCH bpf-next 0/5] bpf, tracing: introduce bpf raw tracepoints

On Mon, Mar 05, 2018 at 02:36:07PM +0100, Daniel Borkmann wrote:
> On 03/01/2018 05:19 AM, Alexei Starovoitov wrote:
> > This patch set is a different way to address the pressing need to access
> > task_struct pointers in sched tracepoints from bpf programs.
> > 
> > The first approach simply added these pointers to sched tracepoints:
> > https://lkml.org/lkml/2017/12/14/753
> > which Peter nacked.
> > Few options were discussed and eventually the discussion converged on
> > doing bpf specific tracepoint_probe_register() probe functions.
> > Details here:
> > https://lkml.org/lkml/2017/12/20/929
> 
> Ping, Peter/Steven. If you have a chance, please review the series.

This series doesn't really touch anything I maintain, but the general
appraoch seems sane to me. I like the first patch that ensures
structures are passed by reference.

The rest is all tracepoint/bpf glue and I never really got into the bpf
internals, so I don't think I've got anything useful to say there.