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SubjectRe: [ck] Re: Swap prefetch merge plans
On Saturday 10 February 2007 07:30, Andrew Morton wrote:
> On Fri, 09 Feb 2007 14:13:03 +0100
> jos poortvliet <> wrote:
> > Nick's comment, replying to me some time ago:
> I think I was thinking of this:

Fortunately that predates a lot of changes where I did address all those.
These will seem out of context without looking at that original email so I
apologise in advance.

buffered_rmqueue and prefetching x86 specific (not into DMA) were dropped

It is NUMA aware

Global cacheline bouncing in page allocation and page reclaim paths I have no
answer for as I have to tell swap prefetch that the vm is busy somehow and I
do that by setting precisely one bit in a lockless manner.

The trylocks were dropped.

The other ideas were to :
-extend the prefetching. That's extra features
-knowing for sure when a system is really idle. I've tried hard to do that as
cheaply as possible.
-putting pages on the lru? well it puts them on the tail
-papering over an issue? As I said, no matter how good the vm is, there will
always be loads that swap.

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