linux-kernel - Re: [PATCH v8 02/22] Allow page fault handlers to perform the COW

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Message-ID: <20140723112347.GB10317@node.dhcp.inet.fi>
Date:	Wed, 23 Jul 2014 14:23:47 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Matthew Wilcox <matthew.r.wilcox@...el.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, willy@...ux.intel.com
Subject: Re: [PATCH v8 02/22] Allow page fault handlers to perform the COW

On Tue, Jul 22, 2014 at 03:47:50PM -0400, Matthew Wilcox wrote:
> Currently COW of an XIP file is done by first bringing in a read-only
> mapping, then retrying the fault and copying the page.  It is much more
> efficient to tell the fault handler that a COW is being attempted (by
> passing in the pre-allocated page in the vm_fault structure), and allow
> the handler to perform the COW operation itself.
> 
> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@...el.com>
> Reviewed-by: Jan Kara <jack@...e.cz>

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
 Kirill A. Shutemov
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