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SubjectPerformance of -mm2 and -mm4

Kernbench: (make -j vmlinux, maximal tasks)
Elapsed System User CPU
2.6.8.1 43.90 87.76 572.94 1505.67
2.6.8.1-mm1 44.26 87.71 574.73 1496.33
2.6.8.1-mm2 44.27 90.27 574.84 1502.33
2.6.8.1-mm4 45.87 97.60 595.23 1510.00

mm2 seems to take slightly (but consistently) more systime than mm1, and
mm4 is significantly worse still ;-(

diffprofile from mm1 to mm2:

5469 32170.6% find_get_page
785 13.0% __d_lookup
476 0.4% total
128 21.9% generic_file_open
93 22.5% __alloc_pages
62 26.1% file_ra_state_init
58 0.0% put_page
54 9.9% dput
...
-51 -2.8% finish_task_switch
-55 -4.3% __wake_up
-67 -6.6% file_move
-128 -1.7% __copy_to_user_ll
-156 -1.1% do_anonymous_page
-2189 -4.7% default_idle
-3632 -100.0% find_trylock_page

and -mm1 to -mm4

5841 34358.8% find_get_page
5394 4.0% total
1459 24.2% __d_lookup
740 9.2% __copy_from_user_ll
718 9.5% __copy_to_user_ll
304 24.0% __wake_up
253 20.2% free_hot_cold_page
248 19.8% atomic_dec_and_lock
229 42.2% dput
228 13.7% path_lookup
226 43.0% Letext
202 34.6% generic_file_open
197 23.6% pte_alloc_one
194 77.0% pgd_ctor
180 22.6% kmem_cache_free
173 6.5% zap_pte_range
170 9.2% buffered_rmqueue
146 16.1% in_group_p
123 22.3% __fput
...
-56 -23.5% file_ra_state_init
-72 -31.7% page_add_anon_rmap
-104 -5.6% finish_task_switch
-124 -0.9% do_anonymous_page
-3633 -100.0% find_trylock_page
-4636 -10.0% default_idle

The -mm4 looks more like sched stuff to me (copy_to/from_user, etc),
but the -mm2 stuff looks like something else. Buggered if I know what.
-mm3 didn't compile cleanly, so I didn't bother, but I prob can if you
like.

m.

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