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Re: [PATCH] mm: remove global locks from mm/highmem.c

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From: David Chinner <dgc@...>
To: Andrew Morton <akpm@...>
Cc: Martin J. Bligh <mbligh@...>, Peter Zijlstra <a.p.zijlstra@...>, <linux-kernel@...>, <linux-mm@...>, Ingo Molnar <mingo@...>, David Chinner <dgc@...>
Subject: Re: [PATCH] mm: remove global locks from mm/highmem.c
Date: Tuesday, January 30, 2007 - 8:44 pm

On Mon, Jan 29, 2007 at 06:15:57PM -0800, Andrew Morton wrote:

Agreed, but don't we (xfs_iozero) have to map it first to zero it?

I think what you are saying here, Andrew, is that we can
do something like:

	page = grab_cache_page
	->prepare_write(page)
	kaddr = kmap_atomic(page, KM_USER0)
	memset(kaddr+offset, 0, bytes)
	flush_dcache_page(page)
	kunmap_atomic(kaddr, KM_USER0)
	->commit_write(page)

to avoid using kmap() altogether?

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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Messages in current thread:
[PATCH] mm: remove global locks from mm/highmem.c, Peter Zijlstra, (Sun Jan 28, 10:11 am)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Andrew Morton, (Sun Jan 28, 6:29 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Ingo Molnar, (Mon Jan 29, 3:08 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Nick Piggin, (Mon Jan 29, 10:02 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Ingo Molnar, (Mon Jan 29, 4:06 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Hugh Dickins, (Mon Jan 29, 3:19 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Ingo Molnar, (Mon Jan 29, 3:53 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Peter Zijlstra, (Mon Jan 29, 5:44 am)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Martin J. Bligh, (Mon Jan 29, 9:31 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Andrew Morton, (Mon Jan 29, 9:41 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Martin J. Bligh, (Mon Jan 29, 9:49 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Andrew Morton, (Mon Jan 29, 10:15 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, David Chinner, (Tue Jan 30, 8:44 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Andrew Morton, (Tue Jan 30, 9:11 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, David Chinner, (Tue Jan 30, 11:22 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Christoph Hellwig, (Fri Feb 2, 8:05 am)
Re: [PATCH] mm: remove global locks from mm/highmem.c, David Chinner, (Fri Feb 2, 7:14 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Matt Mackall, (Fri Feb 2, 3:24 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, David Chinner, (Fri Feb 2, 7:16 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Nick Piggin, (Sun Jan 28, 10:52 pm)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Christoph Hellwig, (Sun Jan 28, 10:49 am)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Ingo Molnar, (Sun Jan 28, 11:17 am)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Christoph Hellwig, (Sun Jan 28, 11:28 am)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Ingo Molnar, (Sun Jan 28, 11:48 am)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Christoph Hellwig, (Sun Jan 28, 11:54 am)
Re: [PATCH] mm: remove global locks from mm/highmem.c, Ingo Molnar, (Sun Jan 28, 2:19 pm)