[Linuxppc-users] function_graph feature or its alternatives

[Dan Horák]

On Tue, 24 Jul 2018 21:20:45 +0530
"Naveen N. Rao" <naveen.n.rao at linux.vnet.ibm.com> wrote:

> Paul Menzel wrote:
> > Dear Naveen,
> > 
> > 
> > On 07/20/18 11:16, Naveen N. Rao wrote:
> >> Dan Horák wrote:
> >>> On Fri, 20 Jul 2018 10:59:59 +1000 Michael Ellerman wrote:
> > 
> >>>> "George Chochia" <chochia at us.ibm.com> writes:
> > 
> >>>> > sending the info: kernel: 4.14.0-49.10.1.el7a.ppc64le
> >>>>
> >>>> OK, so that explains some of the confusion.
> >>>>
> >>>> Typically "4.14.0" would mean the upstream "v4.14" tag, ie. the
> >>>> version prior to "4.14.1", which is different from what you have
> >>>> above.
> >>>>
> >>>> You need to quote the full version string when talking about
> >>>> distro kernels.
> >>>>
> >>>> If you use `uname -r` that should give you the right thing.
> >>>>
> >>>> > The config file has > CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
> >>>> >
> >>>> > but it does not appear in the list of available tracers
> >>>>
> >>>> The HAVE symbol says that the architecture supports the tracer,
> >>>> but not that it's enabled.
> >>>>
> >>>> As Naveen said you need CONFIG_FUNCTION_GRAPH_TRACER=y.
> >>>>
> >>>> It's up to Redhat to decide what tracers they enable.
> >>>
> >>> but partners and customers can influence such decisions, thus I
> >>> would recommend checking it with Red Hat
> >> 
> >> Indeed, and that has been requested.
> > 
> > Just to be clear, is there an open issue/ticket for that in the
> > Red Hat bug tracker [1]?
> 
> For fedora, see https://bugzilla.redhat.com/show_bug.cgi?id=1605126,
> but it seems to require a redhat account.

seems I missed this is for Fedora, I'll take care of that change. I
suppose you want the same change in the RHEL ALT kernel, so I'll clone
the bug accordingly.


		Dan