Re: [PATCH 0/2] Faster MMU lookups for Book3s v3

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On 06/30/2010 04:18 PM, Alexander Graf wrote:
Book3s suffered from my really bad shadow MMU implementation so far. So
I finally got around to implement a combined hash and list mechanism that
allows for much faster lookup of mapped pages.

To show that it really is faster, I tried to run simple process spawning
code inside the guest with and without these patches:

[without]

debian-powerpc:~# time for i in {1..1000}; do /bin/echo hello>  /dev/null; done

real    0m20.235s
user    0m10.418s
sys     0m9.766s

[with]

debian-powerpc:~# time for i in {1..1000}; do /bin/echo hello>  /dev/null; done

real    0m14.659s
user    0m8.967s
sys     0m5.688s

So as you can see, performance improved significantly.

v2 ->  v3:

   - use hlist
   - use global slab cache


Looks good.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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