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    Subject[PATCH 00/10] Remove zonelist cache and high-order watermark checking v4
    Date
    Changelog since V3
    o Rebase to 4.3-rc1
    o Consistent style for __GFP_WAIT (joonsoo)
    o Restored cpuset static checking behaviour (vbabka)
    o Fix cpusets check in allocator fastpath (vbabka)
    o Applied acks

    Changelog since V2
    o Covered cases where __GFP_KSWAPD_RECLAIM is needed (vbabka)
    o Cleaned up trailing references to zlc (vbabka)
    o Fixed a subtle problem with GFP_TRANSHUGE checks (vbabka)
    o Split out an unrelated change to its own patch (vbabka)
    o Reordered series to put GFP flag modifications at start (mhocko)
    o Added a number of clarifications on reclaim modifications (mhocko)
    o Only check cpusets when one exists that can limit memory (rientjes)
    o Applied acks

    Changelog since V1
    o Improve cpusets checks as suggested (rientjes)
    o Add various acks and reviewed-bys
    o Rebase to 4.2-rc6

    Changelog since RFC
    o Rebase to 4.2-rc5
    o Distinguish between high priority callers and callers that avoid sleep
    o Remove jump label related damage patches

    Overall, the intent of this series is to remove the zonelist cache which
    was introduced to avoid high overhead in the page allocator. Once this is
    done, it is necessary to reduce the cost of watermark checks.

    The series starts with minor micro-optimisations.

    Next it notes that GFP flags that affect watermark checks are
    bused. __GFP_WAIT historically identified callers that could not sleep and
    could access reserves. This was later abused to identify callers that simply
    prefer to avoid sleeping and have other options. A patch distinguishes
    between atomic callers, high-priority callers and those that simply wish
    to avoid sleep.

    The zonelist cache has been around for a long time but it is of dubious
    merit with a lot of complexity and some issues that are explained.
    The most important issue is that a failed THP allocation can cause a
    zone to be treated as "full". This potentially causes unnecessary stalls,
    reclaim activity or remote fallbacks. The issues could be fixed but it's
    not worth it. The series places a small number of other micro-optimisations
    on top before examining GFP flags watermarks.

    High-order watermarks enforcement can cause high-order allocations to fail
    even though pages are free. The watermark checks both protect high-order
    atomic allocations and make kswapd aware of high-order pages but there is
    a much better way that can be handled using migrate types. This series uses
    page grouping by mobility to reserve pageblocks for high-order allocations
    with the size of the reservation depending on demand. kswapd awareness
    is maintained by examining the free lists. By patch 12 in this series,
    there are no high-order watermark checks while preserving the properties
    that motivated the introduction of the watermark checks.

    Documentation/vm/balance | 14 +-
    arch/arm/mm/dma-mapping.c | 6 +-
    arch/arm/xen/mm.c | 2 +-
    arch/arm64/mm/dma-mapping.c | 4 +-
    arch/x86/kernel/pci-dma.c | 2 +-
    block/bio.c | 26 +-
    block/blk-core.c | 16 +-
    block/blk-ioc.c | 2 +-
    block/blk-mq-tag.c | 2 +-
    block/blk-mq.c | 8 +-
    block/scsi_ioctl.c | 6 +-
    drivers/block/drbd/drbd_bitmap.c | 2 +-
    drivers/block/drbd/drbd_receiver.c | 3 +-
    drivers/block/mtip32xx/mtip32xx.c | 2 +-
    drivers/block/nvme-core.c | 4 +-
    drivers/block/osdblk.c | 2 +-
    drivers/block/paride/pd.c | 2 +-
    drivers/block/pktcdvd.c | 4 +-
    drivers/connector/connector.c | 3 +-
    drivers/firewire/core-cdev.c | 2 +-
    drivers/gpu/drm/i915/i915_gem.c | 4 +-
    drivers/ide/ide-atapi.c | 2 +-
    drivers/ide/ide-cd.c | 2 +-
    drivers/ide/ide-cd_ioctl.c | 2 +-
    drivers/ide/ide-devsets.c | 2 +-
    drivers/ide/ide-disk.c | 2 +-
    drivers/ide/ide-ioctls.c | 4 +-
    drivers/ide/ide-park.c | 2 +-
    drivers/ide/ide-pm.c | 4 +-
    drivers/ide/ide-tape.c | 4 +-
    drivers/ide/ide-taskfile.c | 4 +-
    drivers/infiniband/core/sa_query.c | 2 +-
    drivers/infiniband/hw/qib/qib_init.c | 2 +-
    drivers/iommu/amd_iommu.c | 2 +-
    drivers/iommu/intel-iommu.c | 2 +-
    drivers/md/dm-crypt.c | 6 +-
    drivers/md/dm-kcopyd.c | 2 +-
    drivers/media/pci/solo6x10/solo6x10-v4l2-enc.c | 2 +-
    drivers/media/pci/solo6x10/solo6x10-v4l2.c | 2 +-
    drivers/media/pci/tw68/tw68-video.c | 2 +-
    drivers/misc/vmw_balloon.c | 2 +-
    drivers/mtd/mtdcore.c | 3 +-
    drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 2 +-
    drivers/scsi/scsi_error.c | 2 +-
    drivers/scsi/scsi_lib.c | 4 +-
    drivers/staging/android/ion/ion_system_heap.c | 2 +-
    .../lustre/include/linux/libcfs/libcfs_private.h | 2 +-
    drivers/staging/rdma/hfi1/init.c | 2 +-
    drivers/staging/rdma/ipath/ipath_file_ops.c | 2 +-
    drivers/usb/host/u132-hcd.c | 2 +-
    drivers/video/fbdev/vermilion/vermilion.c | 2 +-
    fs/btrfs/disk-io.c | 2 +-
    fs/btrfs/extent_io.c | 14 +-
    fs/btrfs/volumes.c | 4 +-
    fs/cachefiles/internal.h | 2 +-
    fs/direct-io.c | 2 +-
    fs/ext4/super.c | 2 +-
    fs/fscache/cookie.c | 2 +-
    fs/fscache/page.c | 6 +-
    fs/jbd2/transaction.c | 4 +-
    fs/nfs/file.c | 6 +-
    fs/nilfs2/mdt.h | 2 +-
    fs/xfs/xfs_qm.c | 2 +-
    include/linux/cpuset.h | 6 +
    include/linux/gfp.h | 70 ++-
    include/linux/mmzone.h | 88 +--
    include/linux/skbuff.h | 6 +-
    include/net/sock.h | 2 +-
    include/trace/events/gfpflags.h | 5 +-
    kernel/audit.c | 6 +-
    kernel/cgroup.c | 2 +-
    kernel/locking/lockdep.c | 2 +-
    kernel/power/snapshot.c | 2 +-
    kernel/power/swap.c | 14 +-
    kernel/smp.c | 2 +-
    lib/idr.c | 4 +-
    lib/percpu_ida.c | 2 +-
    lib/radix-tree.c | 10 +-
    mm/backing-dev.c | 2 +-
    mm/dmapool.c | 2 +-
    mm/failslab.c | 8 +-
    mm/filemap.c | 2 +-
    mm/huge_memory.c | 4 +-
    mm/internal.h | 1 +
    mm/memcontrol.c | 8 +-
    mm/mempool.c | 10 +-
    mm/migrate.c | 4 +-
    mm/page_alloc.c | 599 +++++++--------------
    mm/slab.c | 18 +-
    mm/slub.c | 10 +-
    mm/vmalloc.c | 2 +-
    mm/vmscan.c | 8 +-
    mm/vmstat.c | 2 +-
    mm/zswap.c | 5 +-
    net/core/skbuff.c | 8 +-
    net/core/sock.c | 6 +-
    net/netlink/af_netlink.c | 2 +-
    net/rds/ib_recv.c | 4 +-
    net/rxrpc/ar-connection.c | 2 +-
    net/sctp/associola.c | 2 +-
    security/integrity/ima/ima_crypto.c | 2 +-
    101 files changed, 466 insertions(+), 705 deletions(-)

    --
    2.4.6



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