On Wed, 2015-06-10 at 13:41 +0200, Peter Zijlstra wrote:
> Hi Mike, Ben,
>
> I just noticed:
>
> arch/powerpc/Kconfig: select HAVE_PERF_EVENTS_NMI if PPC64
We actually only added that recently, in c54b2bf1b5e9 "powerpc: Add ppc64 hard
lockup detector support".
AFAICS it doesn't actually have
On Wed, 2015-06-10 at 23:14 +0200, Peter Zijlstra wrote:
> On Wed, 2015-06-10 at 15:13 -0500, Scott Wood wrote:
>
> > What sort of "nesting nonsense" would we get on ppc32? I wasn't
> > trying to say that the pseudo-NMIs didn't count -- I was pointing
> > out
> > that we don't even have that o
On Wed, 2015-06-10 at 15:13 -0500, Scott Wood wrote:
> What sort of "nesting nonsense" would we get on ppc32? I wasn't
> trying to say that the pseudo-NMIs didn't count -- I was pointing out
> that we don't even have that on ppc32.
Oh, I was not aware ppc32 did not have that.
> > # git grep n
On Wed, 2015-06-10 at 21:27 +0200, Peter Zijlstra wrote:
> On Wed, 2015-06-10 at 14:17 -0500, Scott Wood wrote:
> > On Wed, 2015-06-10 at 13:41 +0200, Peter Zijlstra wrote:
> > > Hi Mike, Ben,
> > >
> > > I just noticed:
> > >
> > > arch/powerpc/Kconfig: select HAVE_PERF_EVENTS_NMI if PPC64
> >
On Wed, 2015-06-10 at 14:17 -0500, Scott Wood wrote:
> On Wed, 2015-06-10 at 13:41 +0200, Peter Zijlstra wrote:
> > Hi Mike, Ben,
> >
> > I just noticed:
> >
> > arch/powerpc/Kconfig: select HAVE_PERF_EVENTS_NMI if PPC64
> >
> > But can't ppc32 have FSL_EMB perf?
>
> Yes, but it doesn't use N
On Wed, 2015-06-10 at 13:41 +0200, Peter Zijlstra wrote:
> Hi Mike, Ben,
>
> I just noticed:
>
> arch/powerpc/Kconfig: select HAVE_PERF_EVENTS_NMI if PPC64
>
> But can't ppc32 have FSL_EMB perf?
Yes, but it doesn't use NMIs. ppc64 has lazy interrupt disabling
which functions as a pseudo-NMI
