lkml.org 
[lkml]   [2016]   [Aug]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 1/3] perf/core: Add a tracepoint for perf sampling
On Wed, Aug 03, 2016 at 11:57:05AM -0700, Brendan Gregg wrote:

> As for pmu tracepoints: if I were to instrument it (although I wasn't
> planning to), I'd put a tracepoint in perf_event_overflow() called
> "perf:perf_overflow", with the same arguments. That could then be used
> for all PMU overflow events, without needing to add specific
> tracepoints.

Could we not teach BPF to replace event->overflow_handler and inject
itself there?

We don't currently have nice interfaces for doing that, but it should be
possible to do I think. We already have the indirect function call, so
injecting ourself there has 0 overhead.


\
 
 \ /
  Last update: 2016-08-04 17:21    [W:0.048 / U:0.028 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site