[linux-yocto] [kernel-cache] Question about profiling.scc

[Bruce Ashfield]

On Wed, Aug 7, 2019 at 10:03 PM Hongzhi, Song <hongzhi.song at windriver.com>
wrote:

> Hi Bruce,
>
>
> profiling.cfg is just designed for powertop and oprofile.
>

that comment is a bit misleading. Things like perf events, rely on
config_profiling .. so it is more of a base config than just for those two.

bruce



>
>    1 # for oprofile and powertop
>    2 CONFIG_PROFILING=y
>    3 CONFIG_OPROFILE=y
>    4 CONFIG_FRAME_POINTER=y
>    5 CONFIG_X86_LOCAL_APIC=y
>
> Maybe split profiling.cfg and move them to their recipe is a good way.
>
>
> --Hongzhi
>
>
>
> On 8/7/19 10:43 AM, Bruce Ashfield wrote:
> >
> >
> > On Mon, Aug 5, 2019 at 11:44 PM Hongzhi, Song
> > <hongzhi.song at windriver.com <mailto:hongzhi.song at windriver.com>> wrote:
> >
> >     Hi Bruce,
> >
> >     I see profiling.scc is included by kernel-cache/bsp/*, such as
> >     bsp/intel-x86 bsp/common-pc/ ... .
> >
> >
> >     My question is that is it necessary to open profiling.cfg defaultly?
> >
> >
> > We left profiling as a per-BSP decision, since production machine
> > configurations don't want the overhead that it brings.
> >
> > Not all BSPs follow the split between developer and production, but
> > see how it is used in:
> >
> > bsp/common-pc-64/common-pc-64-developer.scc:include
> > features/profiling/profiling.scc
> > bsp/common-pc-64/common-pc-64-preempt-rt.scc:include
> > features/profiling/profiling.scc
> >
> > If it was enabled by default, it really should be in the developer
> > ktype and then BSPs could have the split between production and
> > developer/debug in their definitions .. with the developer ones
> > getting profiling by default.
> >
> > Bruce
> >
> >
> >
> >     --Hongzhi
> >
> >
> >
> > --
> > - Thou shalt not follow the NULL pointer, for chaos and madness await
> > thee at its end
> > - "Use the force Harry" - Gandalf, Star Trek II
> >
>


-- 
- Thou shalt not follow the NULL pointer, for chaos and madness await thee
at its end
- "Use the force Harry" - Gandalf, Star Trek II
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