[PATCH] VM tuning patch, take 2

[Jonathan Morton <chromi@cyberspace.org>]

>> >>For comparison, what was the time taken by -j15 build before your patch?
>> >
>> >Plain 2.4.5 gives 6m20s, but uses 190Mb of swap to achieve that - nearly 3
>> >times what my patched version does.  I could try adding more swap (on a
>> >faster device) and see what make -j 20 does...
>>
>> On plain 2.4.5 and a 1Gb swapfile located on an Ultra160 10000rpm device,
>> make -j 20 took 7m20s, peaking at 370Mb swap usage.  With the extra
>> patches, it takes 6m30, peaking at 254Mb swap usage.  Looks like the new
>> patches have a greater positive impact the higher the VM load.  :)
>
>From your numbers I have seen no regressions/negative impact, so right
>on :)

OK, the patch is now uploaded at:

http://www.chromatix.uklinux.net/linux-patches/vm-update-2.patch

I'd like people to go over it to make sure I've not boo-booed in some
SMP-incompatible way, then the guys with the big machines and workloads can
have a play.  It incorporates many if not most of the individual
improvements posted here, as well as some additions of my own, so I
strongly reccommend applying to a virgin 2.4.5 tree.

Enjoy!


--------------------------------------------------------------
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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