Re: [PATCH 2.4.23-pre8] Remove broken prefetching in free_one_pgd()

From: David Mosberger <davidm_at_napali.hpl.hp.com>
Date: 2003-10-25 08:01:02
>>>>> On Fri, 24 Oct 2003 13:56:31 -0700, "Luck, Tony" <tony.luck@intel.com> said:

  Tony> This patch was accepted into 2.5.55, attributed to "davej@uk".
  Tony> This code will prefetch from beyond the end of the page table
  Tony> being cleared ... which is clearly a bad thing if the page
  Tony> table in question is allocated from the last page of memory
  Tony> (or precedes a hole on a discontig mem system).

Different arches behave differently, though.  In the case of ia64,
it'a always safe to prefetch (even with lfetch.fault).

	--david
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Received on Fri Oct 24 18:08:29 2003

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