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SubjectRe: page_launder() on 2.4.9/10 issue

On Wed, 29 Aug 2001, Rik van Riel wrote:
> On 28 Aug 2001, Andi Kleen wrote:
>
> > Regarding kswapd in 2.4.9:
> >
> > At least something seems to be broken in it. I did run some 900MB processes
> > on a 512MB machine with 2.4.9 and kswapd took between 70 and 90% of the CPU
> > time.
>
> Well yes, if you never wait on IO synchronously kswapd turns
> into one big busy-loop. But we knew that, it was even written
> down in the comments in vmscan.c ;)

Rik, look again: kswapd _does_ wait on IO these days.

Not ever waiting for IO is just a sure way to overload the IO subsystem
and cause horribleinteractive behaviour.

Linus

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