Re: [Linux-ia64] reader-writer livelock problem

From: David Mosberger <davidm_at_napali.hpl.hp.com>
Date: 2002-11-09 06:26:31
>>>>> On Fri, 8 Nov 2002 19:19:07 +0000, Matthew Wilcox <willy@debian.org> said:

  Matthew> On Fri, Nov 08, 2002 at 12:05:30PM -0600, Van Maren, Kevin
  Matthew> wrote:
  >> Absolutely you should minimize the locking contention.  However,
  >> that isn't always possible, such as when you have 64 processors
  >> contending on the same resource.

  Matthew> if you've got 64 processors contending on the same
  Matthew> resource, maybe you need to split that resource up so they
  Matthew> can have a copy each.  all that cacheline bouncing can't do
  Matthew> your numa boxes any good.

Matthew, please understand that this is NOT a performance problem.
It's a correctness problem.  If livelock can resolut from read-write locks,
it's a huge security problem.  Period.

	--david
Received on Fri Nov 08 11:28:23 2002

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