From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Hugh Dickins <hugh@veritas.com>
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 20:03:32 +1000 [thread overview]
Message-ID: <430AF474.8080805@yahoo.com.au> (raw)
In-Reply-To: <Pine.LNX.4.61.0508230822300.5224@goblin.wat.veritas.com>
Hugh Dickins wrote:
> So the problem ones are i386 PAE and sparc: I haven't got down to sparc
> yet, I expect it to need a little reordering and barriers, but no great
> problem.
>
I don't think that case is a problem because I don't think we
ever allocate or free pmd entries due to some CPU errata.
That is, unless something has changed very recently.
> I don't believe we need to read or write the PAE entries atomically.
>
Hmm, OK. I didn't see the trickery you were doing in do_swap_page
and do_file_page etc. So actually, that seems OK.
Wrapping it in a helper function might be nice (the
recheck-under-lock for sizeof(pte_t) > sizeof(long), that is).
--
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next prev parent reply other threads:[~2005-08-23 10:03 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-22 21:27 [RFT][PATCH 0/2] pagefault scalability alternative 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
2005-08-23 8:14 ` Hugh Dickins
2005-08-23 10:03 ` Nick Piggin [this message]
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
-- strict thread matches above, loose matches on Subject: below --
2005-08-24 14:27 linux
2005-08-24 15:21 ` Hugh Dickins
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