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

David Mosberger
2002-11-08T19:26:31Z

>>>>> 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