From: Hugh Dickins <hugh@veritas.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Christoph Lameter <clameter@engr.sgi.com>,
Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
linux-mm@kvack.org
Subject: Re: [RFT][PATCH 0/2] pagefault scalability alternative
Date: Tue, 23 Aug 2005 08:04:49 +0100 (BST) [thread overview]
Message-ID: <Pine.LNX.4.61.0508230802030.5224@goblin.wat.veritas.com> (raw)
In-Reply-To: <430A6EB5.2000408@yahoo.com.au>
On Tue, 23 Aug 2005, Nick Piggin wrote:
> Christoph Lameter wrote:
>
> > The patch generally drops the first acquisition of the page table lock
> > from handle_mm_fault that is used to protect the read operations on the
> > page table. I doubt that this works with i386 PAE since the page table
> > read operations are not protected by the ptl. These are 64 bit which
> > cannot be reliably retrieved in an 32 bit operation on i386 as you
> > pointed out last fall. There may be concurrent writes so that one gets
> > two pieces that do not fit. PAE mode either needs to fall back to take
> > the page_table_lock for reads or use some tricks to guarantee 64bit
> > atomicity.
>
> Oh yes, you need 64-bit atomic reads and writes for that.
I don't believe we do. Let me expand on that in my reply to Christoph.
Hugh
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next prev parent reply other threads:[~2005-08-23 7:04 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-22 21:27 Hugh Dickins
2005-08-22 21:29 ` [RFT][PATCH 1/2] " Hugh Dickins
2005-08-22 21:31 ` [RFT][PATCH 2/2] " Hugh Dickins
2005-08-23 0:25 ` Nick Piggin
2005-08-23 7:22 ` Hugh Dickins
2005-08-23 11:20 ` Nick Piggin
2005-08-23 13:06 ` Hugh Dickins
2005-08-23 13:29 ` Nick Piggin
2005-08-23 16:38 ` Hugh Dickins
2005-08-23 5:39 ` Andi Kleen
2005-08-23 7:01 ` Hugh Dickins
2005-08-22 22:29 ` [RFT][PATCH 0/2] " Christoph Lameter
2005-08-23 0:32 ` Nick Piggin
2005-08-23 7:04 ` Hugh Dickins [this message]
2005-08-23 8:14 ` Hugh Dickins
2005-08-23 10:03 ` Nick Piggin
2005-08-23 16:30 ` Christoph Lameter
2005-08-23 16:43 ` Martin J. Bligh
2005-08-23 18:29 ` Hugh Dickins
2005-08-27 22:10 ` Avi Kivity
2005-08-24 14:27 linux
2005-08-24 15:21 ` Hugh Dickins
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