Current HighAtomic just to handle the high atomic page alloc.
But I found that use it handle the normal unmovable continuous page
alloc will help to against long-term fragmentation.
Use highatomic as normal page alloc is odd. But I really got some good
results with our internal test and mmtests.
Do you think it is worth to work on it?
The patches was tested with mmtests stress-highalloc modified to do
GFP_KERNEL order-4 allocations, on 4.14.0-rc1+ 2 cpus Vbox 1G memory.
orig ch
Minor Faults 45659477 43315623
Major Faults 319 371
Swap Ins 0 0
Swap Outs 0 0
Allocation stalls 0 0
DMA allocs 93518 18345
DMA32 allocs 42395699 40406865
Normal allocs 0 0
Movable allocs 0 0
Direct pages scanned 7056 16232
Kswapd pages scanned 946174 961750
Kswapd pages reclaimed 945077 942821
Direct pages reclaimed 7022 16170
Kswapd efficiency 99% 98%
Kswapd velocity 1576.352 1567.977
Direct efficiency 99% 99%
Direct velocity 11.755 26.464
Percentage direct scans 0% 1%
Zone normal velocity 1588.108 1594.441
Zone dma32 velocity 0.000 0.000
Zone dma velocity 0.000 0.000
Page writes by reclaim 0.000 0.000
Page writes file 0 0
Page writes anon 0 0
Page reclaim immediate 405 16429
Sector Reads 2027848 2109324
Sector Writes 3386260 3299388
Page rescued immediate 0 0
Slabs scanned 867805 877005
Direct inode steals 337 2072
Kswapd inode steals 33911 41777
Kswapd skipped wait 0 0
THP fault alloc 30 84
THP collapse alloc 188 244
THP splits 0 0
THP fault fallback 67 51
THP collapse fail 6 4
Compaction stalls 111 49
Compaction success 81 35
Compaction failures 30 14
Page migrate success 57962 43921
Page migrate failure 67 183
Compaction pages isolated 117473 88823
Compaction migrate scanned 75548 50403
Compaction free scanned 1454638 672310
Compaction cost 62 47
NUMA alloc hit 42129493 40018326
NUMA alloc miss 0 0
NUMA interleave hit 0 0
NUMA alloc local 42129493 40018326
NUMA base PTE updates 0 0
NUMA huge PMD updates 0 0
NUMA page range updates 0 0
NUMA hint faults 0 0
NUMA hint local faults 0 0
NUMA hint local percent 100 100
NUMA pages migrated 0 0
AutoNUMA cost 0% 0%
Hui Zhu (2):
Try to use HighAtomic if try to alloc umovable page that order is not 0
Change limit of HighAtomic from 1% to 10%
page_alloc.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
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