linux-kernel - Re: [PATCH 1/1] mm: move FAULT_AROUND

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Message-ID: <5331C1C9.5020309@intel.com>
Date:	Tue, 25 Mar 2014 10:50:01 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>,
	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
CC:	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,
	kirill.shutemov@...ux.intel.com, rusty@...tcorp.com.au,
	akpm@...ux-foundation.org, riel@...hat.com, mgorman@...e.de,
	ak@...ux.intel.com, peterz@...radead.org, mingo@...nel.org
Subject: Re: [PATCH 1/1] mm: move FAULT_AROUND_ORDER to arch/

On 03/25/2014 10:36 AM, Kirill A. Shutemov wrote:
>> > +/*
>> > + * Fault around order is a control knob to decide the fault around pages.
>> > + * Default value is set to 0UL (disabled), but the arch can override it as
>> > + * desired.
>> > + */
>> > +#ifndef FAULT_AROUND_ORDER
>> > +#define FAULT_AROUND_ORDER	0UL
>> > +#endif
> FAULT_AROUND_ORDER == 0 case should be handled separately in
> do_read_fault(): no reason to go to do_fault_around() if we are going to
> fault in only one page.

Isn't this the kind of thing we want to do in Kconfig?
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