linux-kernel - Re: [PATCH, RFC 0/9] Introduce huge zero page

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Message-ID: <20120816231247.GA4461@tassilo.jf.intel.com>
Date:	Thu, 16 Aug 2012 16:12:47 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	linux-mm@...ck.org, "H. Peter Anvin" <hpa@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill@...temov.name>
Subject: Re: [PATCH, RFC 0/9] Introduce huge zero page

> Because this is done the right way (i.e. to allocate an hugepage at
> the first wp fault, and to fallback exclusively if compaction fails)
> it will help much less than the 4k zero pages if the zero pages are

The main benefit is that you have a zero page with THP enabled.
So it lowers the cost of having THP on (for workloads that benefit
from a zero page)

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only
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