Re: VM tuning patch, take 2

quoted

- new pages are still given an age of PAGE_AGE_START, which is 2.
PAGE_AGE_ADV has been increased to 4, and PAGE_AGE_MAX to 128.  Pages which
are demand-paged in from swap are given an initial age of PAGE_AGE_MAX/2,
or 64 - this should help to keep these (expensive) pages around for as long
as possible.  Ageing down is now done using a decrement instead of a
division by 2, preserving the age information for longer.

Just one comment about this specific change. I would not like to tweak the
PAGE_AGE_* values until we have centralized page aging. (ie only kswapd
doing the aging)

I forgot to mention, I also have applied the patch which causes allocations
to wait on kswapd.  As far as I can tell, the actual numbers attached to
the ageing matter far less than how they are applied.

--------------------------------------------------------------
from:     Jonathan "Chromatix" Morton
mail:     chromi@cyberspace.org  (not for attachments)

The key to knowledge is not to rely on people to teach you it.

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