Messages in this thread | | | Date | Fri, 8 Jun 2007 15:59:32 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [Intel-IOMMU 02/10] Library routine for pre-allocat pool handling |
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On Sat, 9 Jun 2007, Andi Kleen wrote:
> > Why was it not allowed? Because interrupts are disabled? > > Allocating memory during page out under low memory could > lead to deadlocks. That is because Linux used to make no attempt > to limit dirty pages for anonymous mappings and then you could > end up with most of your memory dirty and not enough > memory cleanable for page out and then when page out > needs more memory you could be dead. > > [yes that implies that mmap over NFS was always broken]
Right. We got that fixed in 2.6.19.
> Now there is a anon dirty limit since a few releases, but I'm not > fully convinced it solves the problem completely.
A gut feeling or is there more?
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