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SubjectRe: [PATCH] anobjrmap 1/6 objrmap
Well, I'm pleased to say not only is your code stable in my tests, it's
also faster than partial objrmap (not by that much, but definitely
measurable). And of course, the code's cleaner. Kernbench & SDET are both
heavy on fork/exec/exit, so this should give these paths a heavy workout.
(this was on 16-way NUMA-Q).

Andrea, are you still working on your code at the moment, or is it ready
for others to play with? I'll make a run at that as well if you say it's
ready, though I think I might have lost track of the latest version ;-)

M.

Kernbench: (make -j N vmlinux, where N = 2 x num_cpus)
Elapsed System User CPU
2.6.5-rc1 45.75 102.49 577.39 1486.00
2.6.5-rc1-partial 44.84 85.75 576.63 1476.67
2.6.5-rc1-hugh 44.79 83.85 576.71 1474.67

Kernbench: (make -j N vmlinux, where N = 16 x num_cpus)
Elapsed System User CPU
2.6.5-rc1 46.99 121.95 580.82 1495.33
2.6.5-rc1-partial 45.09 97.16 579.59 1501.00
2.6.5-rc1-hugh 45.00 95.45 579.05 1498.67

Kernbench: (make -j vmlinux, maximal tasks)
Elapsed System User CPU
2.6.5-rc1 46.96 122.43 580.65 1495.00
2.6.5-rc1-partial 45.18 93.60 579.10 1488.33
2.6.5-rc1-hugh 44.89 91.04 578.49 1490.33


DISCLAIMER: SPEC(tm) and the benchmark name SDET(tm) are registered
trademarks of the Standard Performance Evaluation Corporation. This
benchmarking was performed for research purposes only, and the run results
are non-compliant and not-comparable with any published results.

Results are shown as percentages of the first set displayed

SDET 1 (see disclaimer)
Throughput Std. Dev
2.6.5-rc1 100.0% 3.0%
2.6.5-rc1-partial 101.4% 1.3%
2.6.5-rc1-hugh 100.0% 2.9%

SDET 2 (see disclaimer)
Throughput Std. Dev
2.6.5-rc1 100.0% 1.3%
2.6.5-rc1-partial 107.7% 1.0%
2.6.5-rc1-hugh 108.7% 1.5%

SDET 4 (see disclaimer)
Throughput Std. Dev
2.6.5-rc1 100.0% 0.7%
2.6.5-rc1-partial 110.5% 0.6%
2.6.5-rc1-hugh 114.6% 1.3%

SDET 8 (see disclaimer)
Throughput Std. Dev
2.6.5-rc1 100.0% 0.9%
2.6.5-rc1-partial 119.4% 0.5%
2.6.5-rc1-hugh 120.2% 1.1%

SDET 16 (see disclaimer)
Throughput Std. Dev
2.6.5-rc1 100.0% 0.1%
2.6.5-rc1-partial 118.1% 0.2%
2.6.5-rc1-hugh 119.8% 0.4%

SDET 32 (see disclaimer)
Throughput Std. Dev
2.6.5-rc1 100.0% 0.2%
2.6.5-rc1-partial 119.2% 1.0%
2.6.5-rc1-hugh 120.4% 0.4%

SDET 64 (see disclaimer)
Throughput Std. Dev
2.6.5-rc1 100.0% 0.3%
2.6.5-rc1-partial 122.1% 0.5%
2.6.5-rc1-hugh 123.5% 0.4%

SDET 128 (see disclaimer)
Throughput Std. Dev
2.6.5-rc1 100.0% 0.2%
2.6.5-rc1-partial 123.1% 0.4%
2.6.5-rc1-hugh 124.7% 0.7%


diffprofile from virgin to partial (kernbench)
520 30.0% do_no_page
450 9.6% __copy_from_user_ll
307 5.1% __copy_to_user_ll
93 9.2% __wake_up
89 4.8% schedule
...
-147 -44.8% free_pages_and_swap_cache
-224 -1.6% do_anonymous_page
-319 -9.3% zap_pte_range
-352 -8.9% find_get_page
-388 -30.3% release_pages
-448 -75.4% __pte_chain_free
-555 -1.1% default_idle
-907 -50.4% kmem_cache_free
-4647 -69.4% page_add_rmap
-21876 -90.4% page_remove_rmap
-29063 -16.8% total

And from partial to full:

773 0.0% page_add_anon_rmap
656 0.0% page_add_obj_rmap
367 0.0% set_page_dirty
263 7.3% find_get_page
76 3.4% do_page_fault
64 13.5% .text.lock.file_table
58 2.5% atomic_dec_and_lock
...
-104 -2.0% __copy_from_user_ll
-126 -8.7% free_hot_cold_page
-135 -100.0% pte_chain_alloc
-146 -100.0% __pte_chain_free
-164 -1.9% __d_lookup
-282 -100.0% __set_page_dirty_buffers
-345 -2.4% do_anonymous_page
-549 -23.7% page_remove_rmap
-574 -25.4% do_no_page
-852 -1.7% default_idle
-2046 -100.0% page_add_rmap
-3336 -2.3% total


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