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SubjectPerformance of partial object-based rmap
The performance delta between 2.5.62-mjb1 and 2.5.62-mjb2 is caused
by the partial object-based rmap patch (written by Dave McCracken).
I expect this patch to have an increasing impact on workloads with
more processes, and it should give a substantial space saving as
well as a performance increase. Results from 16x NUMA-Q system ...

Profile comparison:

before
15525 page_remove_rmap
6415 page_add_rmap

after
2055 page_add_rmap
1983 page_remove_rmap

(performance of 62 was equivalent to 61)

Kernbench-2: (make -j N vmlinux, where N = 2 x num_cpus)
Elapsed User System CPU
2.5.61 45.77 561.71 118.87 1486.50
2.5.62-mjb1 45.81 564.41 112.76 1478.00
2.5.62-mjb2 44.88 563.64 98.29 1474.50

Kernbench-16: (make -j N vmlinux, where N = 16 x num_cpus)
Elapsed User System CPU
2.5.61 47.46 565.70 144.77 1496.33
2.5.62-mjb1 47.21 569.17 139.55 1500.67
2.5.62-mjb2 46.09 568.19 121.83 1496.67

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
2.5.61 100.0% 4.5%
2.5.62-mjb1 95.2% 3.0%
2.5.62-mjb2 97.1% 4.6%

SDET 2 (see disclaimer)
Throughput Std. Dev
2.5.61 100.0% 4.3%
2.5.62-mjb1 93.4% 6.6%
2.5.62-mjb2 99.4% 6.1%

SDET 4 (see disclaimer)
Throughput Std. Dev
2.5.61 100.0% 2.4%
2.5.62-mjb1 101.9% 7.1%
2.5.62-mjb2 116.9% 1.5%

SDET 8 (see disclaimer)
Throughput Std. Dev
2.5.61 100.0% 7.4%
2.5.62-mjb1 111.1% 1.8%
2.5.62-mjb2 121.8% 5.9%

SDET 16 (see disclaimer)
Throughput Std. Dev
2.5.61 100.0% 2.0%
2.5.62-mjb1 105.0% 2.2%
2.5.62-mjb2 107.0% 2.1%

SDET 32 (see disclaimer)
Throughput Std. Dev
2.5.61 100.0% 7.9%
2.5.62-mjb1 112.4% 1.2%
2.5.62-mjb2 116.8% 0.9%

SDET 64 (see disclaimer)
Throughput Std. Dev
2.5.61 100.0% 1.2%
2.5.62-mjb1 111.0% 0.7%
2.5.62-mjb2 116.0% 0.9%

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