Re: Performance differences for recent kernels running forky test.

[Andrew Morton]

Steven Cole wrote:
> 
> I ran the following lots_of_forks.sh script for several kernels.
> 
> http://people.nl.linux.org/~phillips/patches/lots_of_forks.sh
> 
> ...
>         2.4.20-pre2     2.4.20-pre2-ac1 2.5.28          2.5.31
> 
> 1       24.96           53.18           39.91           37.04
> 2       24.92           52.42           44.91           45.88
> 3       24.69           50.69           48.63           44.89
> 4       24.39           51.9            58.12           55.8
> 5       24.72           46.14           49.81           43.18
> 6       24.34           47.99           57.62           40.93
> 7       24.64           52.33           50.42           47.27
> 8       24.53           52.84           45              36.49
> 

That's the page_add_rmap/page_remove_rmap thing.  Could you retest
2.5.31 with
http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.31/stuff-sent-to-linus/everything.gz
applied?