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Subject[patch] swap-speedup-2.4.3-B3

the latest swap-speedup patch can be found at:

(the patch is against 2.4.4-pre6 or 2.4.3-ac13.)

-B3 includes Marcelo's patch for another area that blocks unnecesserily on
locked swapcache pages: async swapcache readahead. Marcello did some tests
which shows that this fix brought some nice improvements too.

"make -j32 bzImage" using 128MB mem, 128MB swap, 4 CPUs:

stock 2.4.3-ac13
real 4m0.678s
user 4m2.870s
sys 0m38.920s

real 3m24.190s
user 4m1.070s
sys 0m31.950s

swap-speedup-B3 (A2 + Marcelo's swapin-readahead non-blocking patch)
real 3m7.410s
user 4m0.940s
sys 0m28.680s

ie. for this kernel compile test:

swap-speedup-A2 is a 18% speedup relative to stock 2.4.3-ac13
swap-speedup-B3 is a 28% speedup relative to stock 2.4.3-ac13

and the amount of CPU time spent in the kernel has been reduced
significantly as well.

I believe all the correctness and SMP-locking issues have been taken care
of in -B3 as well.


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