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Date: Thu, 16 Aug 2012 21:37:25 +0300
From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, linux-mm@kvack.org,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
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Subject: Re: [PATCH v3 6/7] mm: make clear_huge_page cache clear only around
 the fault address
Message-ID: <20120816183725.GA30284@shutemov.name>
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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