From: Scott Wood <scottwood@freescale.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Michael Neuling <mikey@neuling.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
<linuxppc-dev@ozlabs.org>
Subject: Re: question on FSL_EMB perf
Date: Wed, 10 Jun 2015 16:28:11 -0500 [thread overview]
Message-ID: <1433971691.2477.150.camel@freescale.com> (raw)
In-Reply-To: <1433970898.1495.60.camel@twins>
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 on ppc32.
>
> Oh, I was not aware ppc32 did not have that.
>
> > > # git grep nmi_enter arch/powerpc/
> > > arch/powerpc/perf/core-book3s.c: nmi_enter();
> > > arch/powerpc/perf/core-fsl-emb.c: nmi_enter();
> >
> > nmi_enter() only gets called when perf_intr_is_nmi() returns non-
> > zero,
> > which only happens on ppc64.
>
> ok, so fsl-emb is ppc32 and ppc64, not confusing at all this stuff.
Both drivers can be used on either 32 or 64 bits.
-Scott
next prev parent reply other threads:[~2015-06-10 21:28 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-10 11:41 question on FSL_EMB perf Peter Zijlstra
2015-06-10 19:17 ` Scott Wood
2015-06-10 19:27 ` Peter Zijlstra
2015-06-10 20:13 ` Scott Wood
2015-06-10 21:14 ` Peter Zijlstra
2015-06-10 21:28 ` Scott Wood [this message]
2015-06-11 6:00 ` Michael Ellerman
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