[PATCH 0/5] compaction related commits

[Joonsoo Kim <iamjoonsoo.kim@lge.com>]

This patchset is related to the compaction.

patch 1 fixes contrary implementation of the purpose of compaction.
patch 2~4 are for optimization.
patch 5 is just for clean-up.

I tested this patchset with stress-highalloc benchmark on Mel's mmtest
and cannot find any regression in terms of success rate. And I find
much reduced system time. Below is result of 3 runs.

* Before
time :: stress-highalloc 3276.26 user 740.52 system 1664.79 elapsed
time :: stress-highalloc 3640.71 user 771.32 system 1633.83 elapsed
time :: stress-highalloc 3691.64 user 775.44 system 1638.05 elapsed

avg system: 1645 s

* After
time :: stress-highalloc 3225.51 user 732.40 system 1542.76 elapsed
time :: stress-highalloc 3524.31 user 749.63 system 1512.88 elapsed
time :: stress-highalloc 3610.55 user 757.20 system 1505.70 elapsed

avg system: 1519 s

That is 7% reduced system time.

Thanks.

Joonsoo Kim (5):
  mm/compaction: disallow high-order page for migration target
  mm/compaction: do not call suitable_migration_target() on every page
  mm/compaction: change the timing to check to drop the spinlock
  mm/compaction: check pageblock suitability once per pageblock
  mm/compaction: clean-up code on success of ballon isolation

 mm/compaction.c |   75 +++++++++++++++++++++++++++++--------------------------
 1 file changed, 39 insertions(+), 36 deletions(-)

-- 
1.7.9.5

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