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SubjectRe: 2.5.69-mm8
>       1004     2.0% default_idle
> 272 8.3% __copy_from_user_ll
> 129 1.7% __d_lookup
> 79 7.5% link_path_walk
> ...
> -50 -1.3% find_get_page
> -55 -1.5% zap_pte_range
> -66 -6.5% file_move
> -74 -1.2% page_add_rmap
> -80 -0.6% do_anonymous_page
> -110 -6.9% schedule
> -139 -7.0% atomic_dec_and_lock
> -698 -0.4% total
> -1139 -4.6% page_remove_rmap
>
> Not sure quite what that's all about, but there it is ;-)

WRT consistency, a second set of runs indicates it's very consistent.
And the user time is down significantly too. These are all averages
of 5 runs to start with (well, averages of the median 3 runs of 5).
Same for the profiles.

Kernbench: (make -j vmlinux, maximal tasks)
Elapsed System User CPU
2.5.69-mm7 46.58 117.00 578.47 1492.00
2.5.69-mm7-2 47.39 117.24 578.58 1468.75
2.5.69-mm8 46.09 115.11 570.74 1487.25
2.5.69-mm8-2 45.91 115.00 571.22 1494.25

The copy to/from user stuff may be noise, but page_remove_rmap and
atomic_dec_and_lock are certainly happier. Second set of runs gives:

3708 8.0% default_idle
1285 0.8% total
161 4.9% __copy_from_user_ll
95 2.5% find_get_page
77 5.8% kmem_cache_free
58 4.7% release_pages
57 5.4% link_path_walk
...
-52 -14.0% .text.lock.filemap
-62 -14.3% .text.lock.file_table
-63 -3.8% do_page_fault
-67 -3.6% path_lookup
-70 -0.5% do_anonymous_page
-84 -10.0% pte_alloc_one
-91 -5.7% schedule
-111 -11.2% clear_page_tables
-118 -6.0% atomic_dec_and_lock
-200 -3.7% __copy_to_user_ll
-338 -4.1% __d_lookup
-931 -3.8% page_remove_rmap

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