[PATCH 0/6] zram idle page writeback

[Minchan Kim]

Inherently, swap device has many idle pages which are rare touched since
it was allocated. It is never problem if we use storage device as swap.
However, it's just waste for zram-swap.

This patchset supports zram idle page writeback feature.

* Admin can define what is idle page "no access since X time ago"
* Admin can define when zram should writeback them
* Admin can define when zram should stop writeback to prevent wearout

Detail is on each patch's description.

Minchan Kim (6):
  zram: fix lockdep warning of free block handling
  zram: refactoring flags and writeback stuff
  zram: introduce ZRAM_IDLE flag
  zram: support idle page writeback
  zram: add bd_stat statistics
  zram: writeback throttle

 Documentation/ABI/testing/sysfs-block-zram |  32 ++
 Documentation/blockdev/zram.txt            |  42 +-
 drivers/block/zram/Kconfig                 |   5 +-
 drivers/block/zram/zram_drv.c              | 435 +++++++++++++++++----
 drivers/block/zram/zram_drv.h              |  18 +-
 5 files changed, 438 insertions(+), 94 deletions(-)

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2.19.1.1215.g8438c0b245-goog