[Linuxppc-users] function_graph feature or its alternatives

[Naveen N. Rao]

Dan Horák wrote:
> On Fri, 20 Jul 2018 10:59:59 +1000
> Michael Ellerman <mpe at ellerman.id.au> wrote:
> 
>> Hi George,
>> 
>> "George Chochia" <chochia at us.ibm.com> writes:
>> > Michael,
>> >
>> > 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.

- Naveen