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Subject[PATCH 0/63] Basic scheduler support for automatic NUMA balancing V9
Date
This series has roughly the same goals as previous versions despite the
size. It reduces overhead of automatic balancing through scan rate reduction
and the avoidance of TLB flushes. It selects a preferred node and moves tasks
towards their memory as well as moving memory toward their task. It handles
shared pages and groups related tasks together. Some problems such as shared
page interleaving and properly dealing with processes that are larger than
a node are being deferred. This version should be ready for wider testing
in -tip.

Note that with kernel 3.12-rc3 that numa balancing will fail to boot if
CONFIG_JUMP_LABEL is configured. This is a separate bug that is currently
being dealt with.

Changelog since V8
o Rebased to v3.12-rc3
o Handle races against hotplug

Changelog since V7
o THP migration race and pagetable insertion fixes
o Do no handle PMDs in batch
o Shared page migration throttling
o Various changes to how last nid/pid information is recorded
o False pid match sanity checks when joining NUMA task groups
o Adapt scan rate based on local/remote fault statistics
o Period retry of migration to preferred node
o Limit scope of system-wide search
o Schedule threads on the same node as process that created them
o Cleanup numa_group on exec

Changelog since V6
o Group tasks that share pages together
o More scan avoidance of VMAs mapping pages that are not likely to migrate
o cpunid conversion, system-wide searching of tasks to balance with

Changelog since V6
o Various TLB flush optimisations
o Comment updates
o Sanitise task_numa_fault callsites for consistent semantics
o Revert some of the scanning adaption stuff
o Revert patch that defers scanning until task schedules on another node
o Start delayed scanning properly
o Avoid the same task always performing the PTE scan
o Continue PTE scanning even if migration is rate limited

Changelog since V5
o Add __GFP_NOWARN for numa hinting fault count
o Use is_huge_zero_page
o Favour moving tasks towards nodes with higher faults
o Optionally resist moving tasks towards nodes with lower faults
o Scan shared THP pages

Changelog since V4
o Added code that avoids overloading preferred nodes
o Swap tasks if nodes are overloaded and the swap does not impair locality

Changelog since V3
o Correct detection of unset last nid/pid information
o Dropped nr_preferred_running and replaced it with Peter's load balancing
o Pass in correct node information for THP hinting faults
o Pressure tasks sharing a THP page to move towards same node
o Do not set pmd_numa if false sharing is detected

Changelog since V2
o Reshuffle to match Peter's implied preference for layout
o Reshuffle to move private/shared split towards end of series to make it
easier to evaluate the impact
o Use PID information to identify private accesses
o Set the floor for PTE scanning based on virtual address space scan rates
instead of time
o Some locking improvements
o Do not preempt pinned tasks unless they are kernel threads

Changelog since V1
o Scan pages with elevated map count (shared pages)
o Scale scan rates based on the vsz of the process so the sampling of the
task is independant of its size
o Favour moving towards nodes with more faults even if it's not the
preferred node
o Laughably basic accounting of a compute overloaded node when selecting
the preferred node.
o Applied review comments

This series integrates basic scheduler support for automatic NUMA balancing.
It was initially based on Peter Ziljstra's work in "sched, numa, mm:
Add adaptive NUMA affinity support" but deviates too much to preserve
Signed-off-bys. As before, if the relevant authors are ok with it I'll
add Signed-off-bys (or add them yourselves if you pick the patches up).
There has been a tonne of additional work from both Peter and Rik van Riel.

Some reports indicate that the performance is getting close to manual
bindings for some workloads but your mileage will vary.

Patch 1 is a monolithic dump of patches thare are destined for upstream that
this series indirectly depends upon.

Patches 2-3 adds sysctl documentation and comment fixlets

Patch 4 avoids accounting for a hinting fault if another thread handled the
fault in parallel

Patches 5-6 avoid races with parallel THP migration and THP splits.

Patch 7 corrects a THP NUMA hint fault accounting bug

Patches 8-9 avoids TLB flushes during the PTE scan if no updates are made

Patch 10 sanitizes task_numa_fault callsites to have consist semantics and
always record the fault based on the correct location of the page.

Patch 11 closes races between THP migration and PMD clearing.

Patch 12 avoids trying to migrate the THP zero page

Patch 13 avoids the same task being selected to perform the PTE scan within
a shared address space.

Patch 14 continues PTE scanning even if migration rate limited

Patch 15 notes that delaying the PTE scan until a task is scheduled on an
alternative node misses the case where the task is only accessing
shared memory on a partially loaded machine and reverts a patch.

Patch 16 initialises numa_next_scan properly so that PTE scanning is delayed
when a process starts.

Patch 17 sets the scan rate proportional to the size of the task being
scanned.

Patch 18 slows the scan rate if no hinting faults were trapped by an idle task.

Patch 19 tracks NUMA hinting faults per-task and per-node

Patches 20-24 selects a preferred node at the end of a PTE scan based on what
node incurred the highest number of NUMA faults. When the balancer
is comparing two CPU it will prefer to locate tasks on their
preferred node. When initially selected the task is rescheduled on
the preferred node if it is not running on that node already. This
avoids waiting for the scheduler to move the task slowly.

Patch 25 adds infrastructure to allow separate tracking of shared/private
pages but treats all faults as if they are private accesses. Laying
it out this way reduces churn later in the series when private
fault detection is introduced

Patch 26 avoids some unnecessary allocation

Patch 27-28 kicks away some training wheels and scans shared pages and
small VMAs.

Patch 29 introduces private fault detection based on the PID of the faulting
process and accounts for shared/private accesses differently.

Patch 30 avoids migrating memory immediately after the load balancer moves
a task to another node in case it's a transient migration.

Patch 31 avoids scanning VMAs that do not migrate-on-fault which addresses
a serious regression on a database performance test.

Patch 32 pick the least loaded CPU based on a preferred node based on
a scheduling domain common to both the source and destination
NUMA node.

Patch 33 retries task migration if an earlier attempt failed

Patch 34 will begin task migration immediately if running on its preferred
node

Patch 35 will avoid trapping hinting faults for shared read-only library
pages as these never migrate anyway

Patch 36 avoids handling pmd hinting faults if none of the ptes below it were
marked pte numa

Patches 37-38 introduce a mechanism for swapping tasks

Patch 39 uses a system-wide search to find tasks that can be swapped
to improve the overall locality of the system.

Patch 40 notes that the system-wide search may ignore the preferred node and
will use the preferred node placement if it has spare compute
capacity.

Patch 41 will perform a global search if a node that should have had capacity
cannot have a task migrated to it

Patches 42-43 use cpupid to track pages so potential sharing tasks can
be quickly found

Patch 44 reports the ID of the numa group a task belongs.

Patch 45 copies the cpupid on page migration

Patch 46 avoids grouping based on read-only pages

Patch 47 stops handling pages within a PMD in batch as it distorts fault
statistics and failed to flush TLBs correctly.

Patch 48 schedules new threads on the same node as the parent.

Patch 49 schedules tasks based on their numa group

Patch 50 cleans up tasks numa_group on exec

Patch 51 avoids parallel updates to group stats

Patch 52 adds some debugging aids

Patches 53-54 separately considers task and group weights when selecting the node to
schedule a task on

Patch 56 checks if PID truncation may have caused false matches before joining tasks
to a NUMA grou

Patch 57 uses the false shared detection information for scan rate adaption later

Patch 58 adapts the scan rate based on local/remote faults

Patch 59 removes the period scan rate reset

Patch 60-61 throttles shared page migrations

Patch 62 avoids the use of atomics protects the values with a spinlock

Patch 63 periodically retries migrating a task back to its preferred node

Kernel 3.12-rc3 is the testing baseline.

o account-v9 Patches 1-8
o periodretry-v8 Patches 1-63

This is SpecJBB running on a 4-socket machine with THP enabled and one JVM
running for the whole system.

specjbb
3.12.0-rc3 3.12.0-rc3
account-v9 periodretry-v9
TPut 1 26187.00 ( 0.00%) 25922.00 ( -1.01%)
TPut 2 55752.00 ( 0.00%) 53928.00 ( -3.27%)
TPut 3 88878.00 ( 0.00%) 84689.00 ( -4.71%)
TPut 4 111226.00 ( 0.00%) 111843.00 ( 0.55%)
TPut 5 138700.00 ( 0.00%) 139712.00 ( 0.73%)
TPut 6 173467.00 ( 0.00%) 161226.00 ( -7.06%)
TPut 7 197609.00 ( 0.00%) 194035.00 ( -1.81%)
TPut 8 220501.00 ( 0.00%) 218853.00 ( -0.75%)
TPut 9 247997.00 ( 0.00%) 244480.00 ( -1.42%)
TPut 10 275616.00 ( 0.00%) 269962.00 ( -2.05%)
TPut 11 301610.00 ( 0.00%) 301051.00 ( -0.19%)
TPut 12 326151.00 ( 0.00%) 318040.00 ( -2.49%)
TPut 13 341671.00 ( 0.00%) 346890.00 ( 1.53%)
TPut 14 372805.00 ( 0.00%) 367204.00 ( -1.50%)
TPut 15 390175.00 ( 0.00%) 371538.00 ( -4.78%)
TPut 16 406716.00 ( 0.00%) 409835.00 ( 0.77%)
TPut 17 429094.00 ( 0.00%) 436172.00 ( 1.65%)
TPut 18 457167.00 ( 0.00%) 456528.00 ( -0.14%)
TPut 19 476963.00 ( 0.00%) 479680.00 ( 0.57%)
TPut 20 492751.00 ( 0.00%) 480019.00 ( -2.58%)
TPut 21 514952.00 ( 0.00%) 511950.00 ( -0.58%)
TPut 22 521962.00 ( 0.00%) 516450.00 ( -1.06%)
TPut 23 537268.00 ( 0.00%) 532825.00 ( -0.83%)
TPut 24 541231.00 ( 0.00%) 539425.00 ( -0.33%)
TPut 25 530459.00 ( 0.00%) 538714.00 ( 1.56%)
TPut 26 538837.00 ( 0.00%) 524894.00 ( -2.59%)
TPut 27 534132.00 ( 0.00%) 519628.00 ( -2.72%)
TPut 28 529470.00 ( 0.00%) 519044.00 ( -1.97%)
TPut 29 504426.00 ( 0.00%) 514158.00 ( 1.93%)
TPut 30 514785.00 ( 0.00%) 513080.00 ( -0.33%)
TPut 31 501018.00 ( 0.00%) 492377.00 ( -1.72%)
TPut 32 488377.00 ( 0.00%) 492108.00 ( 0.76%)
TPut 33 484809.00 ( 0.00%) 493612.00 ( 1.82%)
TPut 34 473015.00 ( 0.00%) 477716.00 ( 0.99%)
TPut 35 451833.00 ( 0.00%) 455368.00 ( 0.78%)
TPut 36 445787.00 ( 0.00%) 460138.00 ( 3.22%)
TPut 37 446034.00 ( 0.00%) 453011.00 ( 1.56%)
TPut 38 433305.00 ( 0.00%) 441966.00 ( 2.00%)
TPut 39 431202.00 ( 0.00%) 443747.00 ( 2.91%)
TPut 40 420040.00 ( 0.00%) 432818.00 ( 3.04%)
TPut 41 416519.00 ( 0.00%) 424105.00 ( 1.82%)
TPut 42 426047.00 ( 0.00%) 430164.00 ( 0.97%)
TPut 43 421725.00 ( 0.00%) 419106.00 ( -0.62%)
TPut 44 414340.00 ( 0.00%) 425471.00 ( 2.69%)
TPut 45 413836.00 ( 0.00%) 418506.00 ( 1.13%)
TPut 46 403636.00 ( 0.00%) 421177.00 ( 4.35%)
TPut 47 387726.00 ( 0.00%) 388190.00 ( 0.12%)
TPut 48 405375.00 ( 0.00%) 418321.00 ( 3.19%)

Mostly flat. Profiles were interesting because they showed heavy contention
on the mm->page_table_lock due to THP faults and migration. It is expected
that Kirill's page table lock split lock work will help here. At the time
of writing that series has been rebased on top for testing.

specjbb Peaks
3.12.0-rc3 3.12.0-rc3
account-v9 periodretry-v9
Expctd Warehouse 48.00 ( 0.00%) 48.00 ( 0.00%)
Expctd Peak Bops 387726.00 ( 0.00%) 388190.00 ( 0.12%)
Actual Warehouse 25.00 ( 0.00%) 25.00 ( 0.00%)
Actual Peak Bops 541231.00 ( 0.00%) 539425.00 ( -0.33%)
SpecJBB Bops 8273.00 ( 0.00%) 8537.00 ( 3.19%)
SpecJBB Bops/JVM 8273.00 ( 0.00%) 8537.00 ( 3.19%)

Minor gain in the overal specjbb score but the peak performance is
slightly lower.

3.12.0-rc3 3.12.0-rc3
account-v9 periodretry-v9
User 44731.08 44820.18
System 189.53 124.16
Elapsed 1665.71 1666.42

3.12.0-rc3 3.12.0-rc3
account-v9 periodretry-v9
Minor Faults 3815276 4471086
Major Faults 108 131
Compaction cost 12002 3214
NUMA PTE updates 17955537 3849428
NUMA hint faults 3950201 3822150
NUMA hint local faults 1032610 1029273
NUMA hint local percent 26 26
NUMA pages migrated 11562658 3096443
AutoNUMA cost 20096 19196

As with previous releases system CPU usage is generally lower with fewer
scans.

autonumabench
3.12.0-rc3 3.12.0-rc3
account-v9 periodretry-v9
User NUMA01 43871.21 ( 0.00%) 53162.55 (-21.18%)
User NUMA01_THEADLOCAL 25270.59 ( 0.00%) 28868.37 (-14.24%)
User NUMA02 2196.67 ( 0.00%) 2110.35 ( 3.93%)
User NUMA02_SMT 1039.18 ( 0.00%) 1035.41 ( 0.36%)
System NUMA01 187.11 ( 0.00%) 154.69 ( 17.33%)
System NUMA01_THEADLOCAL 216.47 ( 0.00%) 95.47 ( 55.90%)
System NUMA02 3.52 ( 0.00%) 3.26 ( 7.39%)
System NUMA02_SMT 2.42 ( 0.00%) 2.03 ( 16.12%)
Elapsed NUMA01 970.59 ( 0.00%) 1199.46 (-23.58%)
Elapsed NUMA01_THEADLOCAL 569.11 ( 0.00%) 643.37 (-13.05%)
Elapsed NUMA02 51.59 ( 0.00%) 49.94 ( 3.20%)
Elapsed NUMA02_SMT 49.73 ( 0.00%) 50.29 ( -1.13%)
CPU NUMA01 4539.00 ( 0.00%) 4445.00 ( 2.07%)
CPU NUMA01_THEADLOCAL 4478.00 ( 0.00%) 4501.00 ( -0.51%)
CPU NUMA02 4264.00 ( 0.00%) 4231.00 ( 0.77%)
CPU NUMA02_SMT 2094.00 ( 0.00%) 2062.00 ( 1.53%)

The numa01 (adverse workload) is hit quite badly but it often is. The
numa01-threadlocal regression is of greater concern and will be examined
further. It is interesting to note that monitoring the workload affects
the results quite severely. These results are based on no monitoring.

This is SpecJBB running on a 4-socket machine with THP enabled and one JVM
running per node on the system.

specjbb
3.12.0-rc3 3.12.0-rc3
account-v9 periodretry-v9
Mean 1 30900.00 ( 0.00%) 29541.50 ( -4.40%)
Mean 2 62820.50 ( 0.00%) 63330.25 ( 0.81%)
Mean 3 92803.00 ( 0.00%) 92629.75 ( -0.19%)
Mean 4 119122.25 ( 0.00%) 121981.75 ( 2.40%)
Mean 5 142391.00 ( 0.00%) 148290.50 ( 4.14%)
Mean 6 151073.00 ( 0.00%) 169823.75 ( 12.41%)
Mean 7 152618.50 ( 0.00%) 166411.00 ( 9.04%)
Mean 8 141284.25 ( 0.00%) 153222.00 ( 8.45%)
Mean 9 136055.25 ( 0.00%) 139262.50 ( 2.36%)
Mean 10 124290.50 ( 0.00%) 133464.50 ( 7.38%)
Mean 11 139939.25 ( 0.00%) 159681.25 ( 14.11%)
Mean 12 137545.75 ( 0.00%) 159829.50 ( 16.20%)
Mean 13 133607.25 ( 0.00%) 157809.00 ( 18.11%)
Mean 14 135512.00 ( 0.00%) 153510.50 ( 13.28%)
Mean 15 132730.75 ( 0.00%) 151627.25 ( 14.24%)
Mean 16 129924.25 ( 0.00%) 148248.00 ( 14.10%)
Mean 17 130339.00 ( 0.00%) 149250.00 ( 14.51%)
Mean 18 124314.25 ( 0.00%) 146486.50 ( 17.84%)
Mean 19 120331.25 ( 0.00%) 143616.75 ( 19.35%)
Mean 20 118827.25 ( 0.00%) 141381.50 ( 18.98%)
Mean 21 120938.25 ( 0.00%) 138196.75 ( 14.27%)
Mean 22 118660.75 ( 0.00%) 136879.50 ( 15.35%)
Mean 23 117005.75 ( 0.00%) 134200.50 ( 14.70%)
Mean 24 112711.50 ( 0.00%) 131302.50 ( 16.49%)
Mean 25 115458.50 ( 0.00%) 129939.25 ( 12.54%)
Mean 26 114008.50 ( 0.00%) 128834.50 ( 13.00%)
Mean 27 115063.50 ( 0.00%) 128394.00 ( 11.59%)
Mean 28 114359.50 ( 0.00%) 124072.50 ( 8.49%)
Mean 29 113637.50 ( 0.00%) 124954.50 ( 9.96%)
Mean 30 113392.75 ( 0.00%) 123941.75 ( 9.30%)
Mean 31 115131.25 ( 0.00%) 121477.75 ( 5.51%)
Mean 32 112004.00 ( 0.00%) 122235.00 ( 9.13%)
Mean 33 111287.50 ( 0.00%) 120992.50 ( 8.72%)
Mean 34 111206.75 ( 0.00%) 118769.75 ( 6.80%)
Mean 35 108469.50 ( 0.00%) 120061.50 ( 10.69%)
Mean 36 105932.00 ( 0.00%) 118039.75 ( 11.43%)
Mean 37 107428.00 ( 0.00%) 118295.75 ( 10.12%)
Mean 38 102804.75 ( 0.00%) 120519.50 ( 17.23%)
Mean 39 104095.00 ( 0.00%) 121461.50 ( 16.68%)
Mean 40 103460.00 ( 0.00%) 122506.50 ( 18.41%)
Mean 41 100417.00 ( 0.00%) 118570.50 ( 18.08%)
Mean 42 101025.75 ( 0.00%) 120612.00 ( 19.39%)
Mean 43 100311.75 ( 0.00%) 120743.50 ( 20.37%)
Mean 44 101769.00 ( 0.00%) 120410.25 ( 18.32%)
Mean 45 99649.25 ( 0.00%) 121260.50 ( 21.69%)
Mean 46 101178.50 ( 0.00%) 121210.75 ( 19.80%)
Mean 47 101148.75 ( 0.00%) 119994.25 ( 18.63%)
Mean 48 103446.00 ( 0.00%) 120204.50 ( 16.20%)
Stddev 1 940.15 ( 0.00%) 1277.19 (-35.85%)
Stddev 2 292.47 ( 0.00%) 1851.80 (-533.15%)
Stddev 3 1750.78 ( 0.00%) 1808.61 ( -3.30%)
Stddev 4 859.01 ( 0.00%) 2790.10 (-224.80%)
Stddev 5 3236.13 ( 0.00%) 1892.19 ( 41.53%)
Stddev 6 2489.07 ( 0.00%) 2157.76 ( 13.31%)
Stddev 7 1981.85 ( 0.00%) 4299.27 (-116.93%)
Stddev 8 2586.24 ( 0.00%) 3090.27 (-19.49%)
Stddev 9 7250.82 ( 0.00%) 4762.66 ( 34.32%)
Stddev 10 1242.89 ( 0.00%) 1448.14 (-16.51%)
Stddev 11 1631.31 ( 0.00%) 9758.25 (-498.19%)
Stddev 12 1964.66 ( 0.00%) 17425.60 (-786.95%)
Stddev 13 2080.24 ( 0.00%) 17824.45 (-756.84%)
Stddev 14 1362.07 ( 0.00%) 18551.85 (-1262.03%)
Stddev 15 3142.86 ( 0.00%) 20410.21 (-549.42%)
Stddev 16 2026.28 ( 0.00%) 19767.72 (-875.57%)
Stddev 17 2059.98 ( 0.00%) 19358.07 (-839.72%)
Stddev 18 2832.80 ( 0.00%) 19434.41 (-586.05%)
Stddev 19 4248.17 ( 0.00%) 19590.94 (-361.16%)
Stddev 20 3163.70 ( 0.00%) 18608.43 (-488.19%)
Stddev 21 1046.22 ( 0.00%) 17766.10 (-1598.13%)
Stddev 22 1458.72 ( 0.00%) 16295.25 (-1017.09%)
Stddev 23 1453.80 ( 0.00%) 16933.28 (-1064.76%)
Stddev 24 3387.76 ( 0.00%) 17276.97 (-409.98%)
Stddev 25 467.26 ( 0.00%) 17228.85 (-3587.21%)
Stddev 26 269.10 ( 0.00%) 17614.19 (-6445.71%)
Stddev 27 1024.92 ( 0.00%) 16197.85 (-1480.40%)
Stddev 28 2547.19 ( 0.00%) 22532.91 (-784.62%)
Stddev 29 2496.51 ( 0.00%) 21734.79 (-770.61%)
Stddev 30 1777.21 ( 0.00%) 22407.22 (-1160.81%)
Stddev 31 2948.17 ( 0.00%) 22046.59 (-647.81%)
Stddev 32 3045.75 ( 0.00%) 21317.50 (-599.91%)
Stddev 33 3088.42 ( 0.00%) 24073.34 (-679.47%)
Stddev 34 1695.86 ( 0.00%) 25483.66 (-1402.69%)
Stddev 35 2392.89 ( 0.00%) 22319.81 (-832.76%)
Stddev 36 1002.99 ( 0.00%) 24788.30 (-2371.43%)
Stddev 37 1246.07 ( 0.00%) 22969.98 (-1743.39%)
Stddev 38 3340.47 ( 0.00%) 17764.75 (-431.80%)
Stddev 39 951.45 ( 0.00%) 17467.43 (-1735.88%)
Stddev 40 1861.87 ( 0.00%) 16746.88 (-799.47%)
Stddev 41 3019.63 ( 0.00%) 22203.85 (-635.32%)
Stddev 42 3305.80 ( 0.00%) 19226.07 (-481.59%)
Stddev 43 2149.96 ( 0.00%) 19788.85 (-820.43%)
Stddev 44 4743.81 ( 0.00%) 20232.47 (-326.50%)
Stddev 45 3701.87 ( 0.00%) 19876.40 (-436.93%)
Stddev 46 3742.49 ( 0.00%) 17963.46 (-379.99%)
Stddev 47 1637.98 ( 0.00%) 20138.13 (-1129.45%)
Stddev 48 2192.84 ( 0.00%) 16729.79 (-662.93%)
TPut 1 123600.00 ( 0.00%) 118166.00 ( -4.40%)
TPut 2 251282.00 ( 0.00%) 253321.00 ( 0.81%)
TPut 3 371212.00 ( 0.00%) 370519.00 ( -0.19%)
TPut 4 476489.00 ( 0.00%) 487927.00 ( 2.40%)
TPut 5 569564.00 ( 0.00%) 593162.00 ( 4.14%)
TPut 6 604292.00 ( 0.00%) 679295.00 ( 12.41%)
TPut 7 610474.00 ( 0.00%) 665644.00 ( 9.04%)
TPut 8 565137.00 ( 0.00%) 612888.00 ( 8.45%)
TPut 9 544221.00 ( 0.00%) 557050.00 ( 2.36%)
TPut 10 497162.00 ( 0.00%) 533858.00 ( 7.38%)
TPut 11 559757.00 ( 0.00%) 638725.00 ( 14.11%)
TPut 12 550183.00 ( 0.00%) 639318.00 ( 16.20%)
TPut 13 534429.00 ( 0.00%) 631236.00 ( 18.11%)
TPut 14 542048.00 ( 0.00%) 614042.00 ( 13.28%)
TPut 15 530923.00 ( 0.00%) 606509.00 ( 14.24%)
TPut 16 519697.00 ( 0.00%) 592992.00 ( 14.10%)
TPut 17 521356.00 ( 0.00%) 597000.00 ( 14.51%)
TPut 18 497257.00 ( 0.00%) 585946.00 ( 17.84%)
TPut 19 481325.00 ( 0.00%) 574467.00 ( 19.35%)
TPut 20 475309.00 ( 0.00%) 565526.00 ( 18.98%)
TPut 21 483753.00 ( 0.00%) 552787.00 ( 14.27%)
TPut 22 474643.00 ( 0.00%) 547518.00 ( 15.35%)
TPut 23 468023.00 ( 0.00%) 536802.00 ( 14.70%)
TPut 24 450846.00 ( 0.00%) 525210.00 ( 16.49%)
TPut 25 461834.00 ( 0.00%) 519757.00 ( 12.54%)
TPut 26 456034.00 ( 0.00%) 515338.00 ( 13.00%)
TPut 27 460254.00 ( 0.00%) 513576.00 ( 11.59%)
TPut 28 457438.00 ( 0.00%) 496290.00 ( 8.49%)
TPut 29 454550.00 ( 0.00%) 499818.00 ( 9.96%)
TPut 30 453571.00 ( 0.00%) 495767.00 ( 9.30%)
TPut 31 460525.00 ( 0.00%) 485911.00 ( 5.51%)
TPut 32 448016.00 ( 0.00%) 488940.00 ( 9.13%)
TPut 33 445150.00 ( 0.00%) 483970.00 ( 8.72%)
TPut 34 444827.00 ( 0.00%) 475079.00 ( 6.80%)
TPut 35 433878.00 ( 0.00%) 480246.00 ( 10.69%)
TPut 36 423728.00 ( 0.00%) 472159.00 ( 11.43%)
TPut 37 429712.00 ( 0.00%) 473183.00 ( 10.12%)
TPut 38 411219.00 ( 0.00%) 482078.00 ( 17.23%)
TPut 39 416380.00 ( 0.00%) 485846.00 ( 16.68%)
TPut 40 413840.00 ( 0.00%) 490026.00 ( 18.41%)
TPut 41 401668.00 ( 0.00%) 474282.00 ( 18.08%)
TPut 42 404103.00 ( 0.00%) 482448.00 ( 19.39%)
TPut 43 401247.00 ( 0.00%) 482974.00 ( 20.37%)
TPut 44 407076.00 ( 0.00%) 481641.00 ( 18.32%)
TPut 45 398597.00 ( 0.00%) 485042.00 ( 21.69%)
TPut 46 404714.00 ( 0.00%) 484843.00 ( 19.80%)
TPut 47 404595.00 ( 0.00%) 479977.00 ( 18.63%)
TPut 48 413784.00 ( 0.00%) 480818.00 ( 16.20%)

This is looking much better overall although I am concerned about the
increased variability between JVMs.

specjbb Peaks
3.12.0-rc3 3.12.0-rc3
account-v9 periodretry-v9
Expctd Warehouse 12.00 ( 0.00%) 12.00 ( 0.00%)
Expctd Peak Bops 559757.00 ( 0.00%) 638725.00 ( 14.11%)
Actual Warehouse 8.00 ( 0.00%) 7.00 (-12.50%)
Actual Peak Bops 610474.00 ( 0.00%) 679295.00 ( 11.27%)
SpecJBB Bops 502292.00 ( 0.00%) 582258.00 ( 15.92%)
SpecJBB Bops/JVM 125573.00 ( 0.00%) 145565.00 ( 15.92%)

Looking fine.

3.12.0-rc3 3.12.0-rc3
account-v9 periodretry-v9
User 481412.08 481942.54
System 1301.91 578.20
Elapsed 10402.09 10404.47

3.12.0-rc3 3.12.0-rc3
account-v9 periodretry-v9
Compaction cost 105928 13748
NUMA PTE updates 457567880 45890118
NUMA hint faults 69831880 45725506
NUMA hint local faults 19303679 28637898
NUMA hint local percent 27 62
NUMA pages migrated 102050548 13244738
AutoNUMA cost 354301 229200

and system CPU usage is still way down so now we are seeing large
improvements for less work. Previous tests had indicated that period
retrying of task migration was necessary for a good "local percent"
of local/remote faults. It implies that the load balancer and NUMA
scheduling may be making conflicting decisions.

While there is still plenty of future work it looks like this is ready
for wider testing.

Documentation/sysctl/kernel.txt | 76 +++
fs/exec.c | 1 +
fs/proc/array.c | 2 +
include/linux/cpu.h | 67 ++-
include/linux/mempolicy.h | 1 +
include/linux/migrate.h | 7 +-
include/linux/mm.h | 118 +++-
include/linux/mm_types.h | 17 +-
include/linux/page-flags-layout.h | 28 +-
include/linux/sched.h | 67 ++-
include/linux/sched/sysctl.h | 1 -
include/linux/stop_machine.h | 1 +
kernel/bounds.c | 4 +
kernel/cpu.c | 227 ++++++--
kernel/fork.c | 5 +-
kernel/sched/core.c | 184 ++++++-
kernel/sched/debug.c | 60 +-
kernel/sched/fair.c | 1092 ++++++++++++++++++++++++++++++++++---
kernel/sched/features.h | 19 +-
kernel/sched/idle_task.c | 2 +-
kernel/sched/rt.c | 5 +-
kernel/sched/sched.h | 27 +-
kernel/sched/stop_task.c | 2 +-
kernel/stop_machine.c | 272 +++++----
kernel/sysctl.c | 21 +-
mm/huge_memory.c | 119 +++-
mm/memory.c | 158 ++----
mm/mempolicy.c | 82 ++-
mm/migrate.c | 49 +-
mm/mm_init.c | 18 +-
mm/mmzone.c | 14 +-
mm/mprotect.c | 65 +--
mm/page_alloc.c | 4 +-
33 files changed, 2248 insertions(+), 567 deletions(-)

--
1.8.4



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