From: Scott Wood <scottwood@freescale.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 6/7] powerpc/mm: 64-bit: tlb handler micro-optimization
Date: Wed, 18 May 2011 17:27:20 -0500 [thread overview]
Message-ID: <20110518172720.465e3789@schlenkerla.am.freescale.net> (raw)
In-Reply-To: <1305755688.7481.12.camel@pasglop>
On Thu, 19 May 2011 07:54:48 +1000
Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> On Wed, 2011-05-18 at 16:51 -0500, Scott Wood wrote:
> > On Thu, 19 May 2011 07:37:47 +1000
> > Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> >
> > > On Wed, 2011-05-18 at 16:05 -0500, Scott Wood wrote:
> > > > A little more speed up measured on e5500.
> > > >
> > > > Setting of U0-3 is dropped as it is not used by Linux as far as I can
> > > > see.
> > >
> > > Please keep them for now. If your core doesn't have them, make them an
> > > MMU feature.
> >
> > We have them, it was just an attempt to clean out unused things to speed up
> > the miss handler. I'll drop that part if you think we'll use it in the
> > future.
>
> I never know for sure ... damn research people ... :-)
>
> I'd rather keep them for now, does it make a significant difference ?
It was minor but measurable (wouldn't have been worthwhile except as part
of a series of small things that add up), but upon trying again I was able
to reorder slightly and fit it in without seeing an impact.
-Scott
next prev parent reply other threads:[~2011-05-18 22:27 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-18 21:04 [PATCH 1/7] powerpc/mm: 64-bit 4k: use page-sized PMDs Scott Wood
2011-05-18 21:05 ` [PATCH 2/7] powerpc/mm: 64-bit 4k: use a PMD-based virtual page table Scott Wood
2011-05-18 21:33 ` Benjamin Herrenschmidt
2011-05-20 20:57 ` Scott Wood
2011-05-20 22:15 ` Benjamin Herrenschmidt
2011-05-23 18:54 ` Scott Wood
2011-05-23 20:51 ` Benjamin Herrenschmidt
2011-05-23 23:31 ` Scott Wood
2011-05-24 2:52 ` Benjamin Herrenschmidt
2011-05-18 21:05 ` [PATCH 3/7] powerpc/mm: 64-bit tlb miss: get PACA from memory rather than SPR Scott Wood
2011-05-18 21:05 ` [PATCH 4/7] powerpc/mm: 64-bit: Don't load PACA in normal TLB miss exceptions Scott Wood
2011-05-18 21:05 ` [PATCH 5/7] powerpc/mm: 64-bit: don't handle non-standard page sizes Scott Wood
2011-05-18 21:36 ` Benjamin Herrenschmidt
2011-05-18 21:50 ` Scott Wood
2011-05-18 21:54 ` Benjamin Herrenschmidt
2011-05-18 21:05 ` [PATCH 6/7] powerpc/mm: 64-bit: tlb handler micro-optimization Scott Wood
2011-05-18 21:37 ` Benjamin Herrenschmidt
2011-05-18 21:51 ` Scott Wood
2011-05-18 21:54 ` Benjamin Herrenschmidt
2011-05-18 22:27 ` Scott Wood [this message]
2011-05-18 21:05 ` [PATCH 7/7] powerpc/e5500: set MMU_FTR_USE_PAIRED_MAS Scott Wood
2011-05-18 21:38 ` Benjamin Herrenschmidt
2011-05-18 21:52 ` Scott Wood
2011-05-18 21:58 ` Benjamin Herrenschmidt
2011-05-18 21:32 ` [PATCH 1/7] powerpc/mm: 64-bit 4k: use page-sized PMDs Benjamin Herrenschmidt
2011-05-18 21:46 ` Scott Wood
2011-05-18 21:52 ` Benjamin Herrenschmidt
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