On Thursday 16 March 2006 21:46, Pavel Machek wrote:
> > On Thursday 16 March 2006 04:59, Pavel Machek wrote:
> > The tunable in /proc/sys/vm/swap_prefetch is now bitwise ORed:
> > 1 = Normal background swap prefetching when load is light
> > 2 = Aggressively swap prefetch as much as possible
> >
> > And once the "aggressive" bit is set it will prefetch as much as it can
> > and then disable the aggressive bit. Thus if you set this value to 3 it
> > will prefetch aggressively and then drop back to the default of 1. This
> > makes it easy to simply set the aggressive flag once and forget about it.
> > I've booted and tested this feature and it's working nicely. Where
> > exactly you'd set this in your resume scripts I'm not sure. A rolled up
> > patch against 2.6.16-rc6-mm1 is here for simplicity:
> > http://ck.kolivas.org/patches/swap-prefetch/2.6.16-rc6-mm1-swap_prefetch_
> >suspend_test.patch
> >
> > and the incremental on top of the 4 patches pending for the next -mm is
> > below.
> >
> > Comments and testers most welcome.
>
> Looks okay, but... what happens if I set /proc/sys/vm/swap_prefetch to
> "2"? Do nothing but do it agresively?
>
> Maybe having 0 = off, 1 = normal, 2 = aggressive would be less error
> prone for the users.
2 means aggressively prefetch as much as possible and then disable swap
prefetching from that point on. Too confusing?
Cheers,
Con
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