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

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Message-Id: <20140520003201.a2360d5d.akpm@linux-foundation.org>
Date:	Tue, 20 May 2014 00:32:01 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>,
	Madhavan Srinivasan <maddy@...ux.vnet.ibm.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, 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 15:52:07 +0930 Rusty Russell <rusty@...tcorp.com.au> wrote:

> "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> writes:
> > Andrew Morton wrote:
> >> On Mon, 19 May 2014 16:23:07 -0700 (PDT) Hugh Dickins <hughd@...gle.com> wrote:
> >> 
> >> > Shouldn't FAULT_AROUND_ORDER and fault_around_order be changed to be
> >> > the order of the fault-around size in bytes, and fault_around_pages()
> >> > use 1UL << (fault_around_order - PAGE_SHIFT)
> >> 
> >> Yes.  And shame on me for missing it (this time!) at review.
> >> 
> >> There's still time to fix this.  Patches, please.
> >
> > Here it is. Made at 3.30 AM, build tested only.
> 
> Prefer on top of Maddy's patch which makes it always a variable, rather
> than CONFIG_DEBUG_FS.  It's got enough hair as it is.
> 

We're at 3.15-rc5 and this interface should be finalised for 3.16.  So
Kirrill's patch is pretty urgent and should come first.

Well.  It's only a debugfs interface at this stage so we are allowed to
change it later, but it's better not to.
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