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    Subject[RFC 0/2] Use HighAtomic against long-term fragmentation
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    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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