From: Dave Jones <davej@redhat.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [PATCH 2.4.23-pre8] Remove broken prefetching in free_one_pgd()
Date: Sun, 26 Oct 2003 14:51:56 +0000 [thread overview]
Message-ID: <marc-linux-ia64-106717995315153@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-106702916015259@msgid-missing>
On Sat, Oct 25, 2003 at 10:10:10PM +0200, Pavel Machek wrote:
> > This patch was accepted into 2.5.55, attributed to "davej@uk".
> Dave Jones?n
Yep.
> > This code will prefetch from beyond the end of the page table
> > being cleared ... which is clearly a bad thing if the page table
> > in question is allocated from the last page of memory (or precedes
> > a hole on a discontig mem system).
> Prefetching random addresses should be safe...
It isn't on some CPUs. Early athlons go bang when you prefetch
past the end of RAM into unmapped memory for eg.
Dave
--
Dave Jones http://www.codemonkey.org.uk
next prev parent reply other threads:[~2003-10-26 14:51 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-24 20:56 [PATCH 2.4.23-pre8] Remove broken prefetching in free_one_pgd() Luck, Tony
2003-10-24 22:01 ` David Mosberger
2003-10-24 22:16 ` Luck, Tony
2003-10-24 22:21 ` David Mosberger
2003-10-25 20:10 ` Pavel Machek
2003-10-26 14:51 ` Dave Jones [this message]
2003-10-27 9:52 ` Pavel Machek
2003-10-27 11:58 ` Dave Jones
2003-10-30 20:57 ` Bjorn Helgaas
2003-10-30 21:36 ` Luck, Tony
-- strict thread matches above, loose matches on Subject: below --
2003-10-24 20:56 Luck, Tony
2003-10-24 22:01 ` David Mosberger
2003-10-25 20:10 ` Pavel Machek
2003-10-26 14:51 ` Dave Jones
2003-10-27 9:52 ` Pavel Machek
2003-10-27 11:58 ` Dave Jones
2003-10-24 22:16 Luck, Tony
2003-10-24 22:21 ` David Mosberger
2003-10-30 20:57 ` Bjorn Helgaas
2003-10-30 21:36 Luck, Tony
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