Messages in this thread | | | Date | Sun, 8 Sep 2002 21:48:58 +0100 (BST) | From | Hugh Dickins <> | Subject | Re: LMbench2.0 results |
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On Sun, 8 Sep 2002, Andrew Morton wrote: > > We need to find some way of making vm_enough_memory not call get_page_state > so often. One way of doing that might be to make get_page_state dump > its latest result into a global copy, and make vm_enough_memory() > only get_page_state once per N invokations. A speed/accuracy tradeoff there.
Accuracy is not very important in that sysctl_overcommit_memory 0 case e.g. the swapper_space.nr_pages addition was brought in at a time when it was very necessary, but usually overestimates now (or last time I thought about it). The main thing to look out for is running the same memory grabber twice in quick succession: not nice if it succeeds the first time, but not the second, just because of some transient effect that its old pages are temporarily uncounted.
Hugh
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