Messages in this thread | | | Date | Mon, 13 Feb 2006 13:16:00 -0800 (PST) | From | Christoph Lameter <> | Subject | Re: [PATCH] mm: Implement Swap Prefetching v25 |
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On Mon, 13 Feb 2006, David Lang wrote:
> On Mon, 13 Feb 2006, Christoph Lameter wrote: > > spare ram when swapping??? We are already under memory pressure. Why make > > it worse by getting rid of the few bits of available memory? If a system > > swaps then we are per definition in the bad performance range. Add more > > memory. > when a program exits it's memory is now free, rather then just waiting until > something uses this memory up normally, this patch attempts to fill that > memory with things that are expected to be useful (things that were swapped > out)
Then trigger this action when a program exits and when you know there was enough freed up to justify such an action. However, this is still a heuristic. No one knows if the pages read from swap will be of any use at all. For all I know a process may want to allocate some memory and fail because the memory was needlessly spend to read in pages that no one needs.
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