linux-kernel - Re: [PATCH V4 0/2] mm: FAULT_AROUND_ORDER patchset performance data for powerpc

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Message-ID: <alpine.LSU.2.11.1405191930130.3574@eggly.anvils>
Date:	Mon, 19 May 2014 19:34:27 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
cc:	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-mm@...ck.org, linux-arch@...r.kernel.org, x86@...nel.org,
	benh@...nel.crashing.org, paulus@...ba.org,
	akpm@...ux-foundation.org, riel@...hat.com, mgorman@...e.de,
	ak@...ux.intel.com, peterz@...radead.org, mingo@...nel.org,
	dave.hansen@...el.com
Subject: Re: [PATCH V4 0/2] mm: FAULT_AROUND_ORDER patchset performance data
 for powerpc

On Tue, 20 May 2014, Rusty Russell wrote:
> Hugh Dickins <hughd@...gle.com> writes:
> >> On Monday 19 May 2014 05:42 AM, Rusty Russell wrote:
> >> > 
> >> > Perhaps we try to generalize from two data points (a slight improvement
> >> > over doing it from 1!), eg:
> >> > 
> >> > /* 4 seems good for 4k-page x86, 0 seems good for 64k page ppc64, so: */
> >> > unsigned int fault_around_order __read_mostly =
> >> >         (16 - PAGE_SHIFT < 0 ? 0 : 16 - PAGE_SHIFT);
> >
> > Rusty's bimodal answer doesn't seem the right starting point to me.
> 
> ?  It's not bimodal, it's graded.  I think you misread?

Yikes, worse than misread, more like I was too rude even to read: sorry!

Hugh
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