linux-kernel - Re: [PATCH v3 6/7] mm: make clear_huge_page cache clear only around the fault address

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Message-ID: <20120816183725.GA30284@shutemov.name>
Date:	Thu, 16 Aug 2012 21:37:25 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	linux-mm@...ck.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Andi Kleen <ak@...ux.intel.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Alex Shi <alex.shu@...el.com>,
	Jan Beulich <jbeulich@...ell.com>,
	Robert Richter <robert.richter@....com>,
	Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-mips@...ux-mips.org,
	linux-sh@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH v3 6/7] mm: make clear_huge_page cache clear only around
 the fault address

On Thu, Aug 16, 2012 at 08:29:44PM +0200, Andrea Arcangeli wrote:
> On Thu, Aug 16, 2012 at 07:43:56PM +0300, Kirill A. Shutemov wrote:
> > Hm.. I think with static_key we can avoid cache overhead here. I'll try.
> 
> Could you elaborate on the static_key? Is it some sort of self
> modifying code?

Runtime code patching. See Documentation/static-keys.txt. We can patch it
on sysctl.

> 
> > Thanks, for review. Could you take a look at huge zero page patchset? ;)
> 
> I've noticed that too, nice :). I'm checking some detail on the
> wrprotect fault behavior but I'll comment there.
> 
> --
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-- 
 Kirill A. Shutemov
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