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SubjectOdd benchmark results ... 62 vs -mm vs -mjb
The usual 16x NUMA-Q system ... this is all cache warm out of pagecache, so
I don't see why AS would make a difference. -mm and -mjb are fairly
consistent (as I'd expect) except for kernbench -j256 (the middle one)
where you somehow do dramtically better (on systime especially). These are
the averages of 5 runs, and they only move by a second or two of systime,
so I don't think it's experimental error. I ran SDET as well, but it wasn't
very interesting.

Kernbench: (make -j N vmlinux, where N = 2 x num_cpus)
Elapsed System User CPU
2.5.63 45.47 111.20 563.81 1483.50
2.5.63-mm2 44.27 94.30 562.88 1484.00
2.5.63-mjb2 44.09 94.38 557.26 1477.00

Kernbench: (make -j N vmlinux, where N = 16 x num_cpus)
Elapsed System User CPU
2.5.63 47.09 138.43 567.92 1499.25
2.5.63-mm2 44.94 108.35 565.37 1497.50
2.5.63-mjb2 45.53 118.06 560.48 1489.50

Kernbench: (make -j vmlinux, maximal tasks)
Elapsed System User CPU
2.5.63 47.30 138.33 568.13 1497.00
2.5.63-mm2 45.62 119.91 565.66 1499.25
2.5.63-mjb2 45.17 117.80 560.62 1500.50


diffprofile 2.5.63-mm2 2.5.63-mjb2 (both have objrmap + fixes)
(+ gets worse going from -mm to -mjb, - better) for -j256.

12196 7.9% total
9773 81.5% .text.lock.file_table
3484 7.5% default_idle
915 554.5% do_generic_mapping_read
823 21.5% get_empty_filp
569 26.8% __fput
462 76.0% dput
457 11.2% vm_enough_memory
456 29.9% file_move
386 21.6% page_add_rmap
215 1.5% do_anonymous_page
151 23.3% fd_install
137 415.2% eventpoll_init_file
117 354.5% kmem_cache_alloc
100 0.0% pmd_ctor
82 18.3% file_ra_state_init
70 0.0% update_atime
67 1.4% __copy_to_user_ll
63 2.2% zap_pte_range
62 24.0% __set_page_dirty_buffers
59 3.8% buffered_rmqueue
55 2.0% atomic_dec_and_lock
52 44.1% filp_close
51 4.5% vfs_read
50 33.3% prep_new_page
...
-52 -100.0% free_pages_bulk
-54 -73.0% lru_cache_add
-56 -100.0% migration_task
-57 -18.6% flush_signal_handlers
-68 -69.4% set_cpus_allowed
-68 -10.3% kmap_atomic
-69 -49.6% set_page_address
-75 -60.0% sched_best_cpu
-80 -100.0% prepare_to_wait_exclusive
-82 -26.3% exit_notify
-90 -25.0% remove_shared_vm_struct
-108 -84.4% kmalloc
-110 -44.0% kmem_cache_free
-151 -88.3% eventpoll_release
-172 -19.1% strnlen_user
-180 -100.0% pgd_ctor
-207 -45.3% complete
-207 -100.0% find_trylock_page
-210 -100.0% one_sec_update_atime
-276 -100.0% __down
-292 -90.7% current_kernel_time
-351 -35.1% clear_page_tables
-409 -53.9% __wake_up
-543 -28.2% path_lookup
-567 -25.9% do_schedule
-707 -38.1% do_no_page
-736 -23.0% find_get_page

OK, so who killed .text.lock.file_table? and how? ;-)

If I do a "-j" instead (infinte tasks), it looks boringly similar
from the results, but the profiles tell a different story:
(+ gets worse going from -mm to -mjb, - better)

3426 18.3% .text.lock.file_table
937 574.8% do_generic_mapping_read
610 14.6% vm_enough_memory
470 72.3% dput
285 2.0% do_anonymous_page
260 14.8% page_add_rmap
161 10.4% buffered_rmqueue
158 493.8% eventpoll_init_file
130 0.0% pmd_ctor
107 44.0% __set_page_dirty_buffers
99 12.8% fd_install
92 58.2% prep_new_page
64 177.8% kmem_cache_alloc
60 0.0% update_atime
...
-50 -100.0% free_pages_bulk
-53 -72.6% lru_cache_add
-55 -15.1% remove_shared_vm_struct
-56 -2.7% do_page_fault
-57 -9.1% copy_process
-59 -100.0% migration_task
-65 -56.5% wait_for_completion
-69 -53.5% set_page_address
-70 -41.2% dup_task_struct
-72 -10.9% kmap_atomic
-76 -24.1% exit_notify
-83 -27.4% flush_signal_handlers
-86 -68.3% sched_best_cpu
-99 -76.7% kmalloc
-104 -36.6% kmem_cache_free
-106 -11.7% strnlen_user
-114 -23.6% __wake_up
-117 -9.4% vfs_read
-123 -2.7% get_empty_filp
-131 -76.6% eventpoll_release
-135 -23.5% pte_alloc_one
-144 -13.8% link_path_walk
-148 -3.0% __copy_to_user_ll
-163 -35.2% complete
-185 -6.8% __fput
-191 -100.0% one_sec_update_atime
-215 -100.0% pgd_ctor
-227 -76.4% current_kernel_time
-236 -100.0% find_trylock_page
-252 -7.7% atomic_dec_and_lock
-285 -28.4% clear_page_tables
-498 -24.4% path_lookup
-524 -6.4% d_lookup
-534 -26.1% do_schedule
-603 -32.7% do_no_page
-817 -24.9% find_get_page
-1911 -4.0% default_idle
-2470 -1.5% total

BTW, I have your "atime" patch you sent me in -mjb2, and fstab is:

# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump>
<pass>
/dev/sda2 / ext2 defaults,noatime,errors=remount-ro
0 1
/dev/sdd1 /home/mbligh ext3 defaults,noatime 0
2
proc /proc proc defaults 0
0
/dev/cdrom /cdrom iso9660 defaults,ro,user,noauto 0
0
ramfs /ram ramfs defaults 0
2

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