Messages in this thread | | | Date | Thu, 9 Apr 2009 09:22:36 +0200 | From | Andi Kleen <> | Subject | Re: [PATCH] [0/16] POISON: Intro |
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On Wed, Apr 08, 2009 at 10:29:34AM -0700, Roland Dreier wrote: > > [1] I didn't consider that one high priority since production > > systems with long uptime shouldn't have much free memory. > > Surely there are windows after a big job exits where lots of memory > might be free. Not sure how big those windows are in practice but it > does seem if a process using 128GB exits then it might take a while > before that memory all gets used again.
Yes, it's definitely something to be fixed at some point. Basically just needs a new entry point into the page_alloc buddy allocator to unfree a page. The more tricky part is actually finding a good injector design for testing for it, there's no natural race free way to get a free page.
-Andi -- ak@linux.intel.com -- Speaking for myself only.
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