From: Peter Zijlstra <peterz@infradead.org>
To: Scott Wood <scottwood@freescale.com>
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 23:14:58 +0200 [thread overview]
Message-ID: <1433970898.1495.60.camel@twins> (raw)
In-Reply-To: <1433967236.2477.146.camel@freescale.com>
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=20
> trying to say that the pseudo-NMIs didn't count -- I was pointing out=20
> 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();
>=20
> nmi_enter() only gets called when perf_intr_is_nmi() returns non-zero,=
=20
> which only happens on ppc64.
ok, so fsl-emb is ppc32 and ppc64, not confusing at all this stuff.
next prev parent reply other threads:[~2015-06-10 21:15 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 [this message]
2015-06-10 21:28 ` Scott Wood
2015-06-11 6:00 ` Michael Ellerman
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