Re: [PATCH] mm: Implement Swap Prefetching v25

[Christoph Lameter]

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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