Re: [PATCH 2/2] sched/debug: add sched_update_nr_running tracepoint
From: Ingo Molnar
Date: Thu Sep 05 2019 - 04:13:17 EST
* Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx> wrote:
> On Wed, Sep 4, 2019 at 10:47 AM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> > On Wed, Sep 04, 2019 at 08:51:21AM -0700, Alexei Starovoitov wrote:
> > > Anything in tracing can be deleted.
> > > Tracing is about debugging and introspection.
> > > When underlying kernel code changes the introspection points change as well.
> > Right; except when it breaks widely used tools; like say powertop. Been
> > there, done that.
> powertop was a lesson learned, but it's not a relevant example anymore.
> There are more widely used tools today. Like bcc tools.
> And bpftrace is quickly gaining momentum and large user base.
> bcc tools did break already several times and people fixed them.
Are these tools using libtraceevents?