[PATCH 0/4] block: add two statistic tables

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Hi Jens,

This version just added reviewed-by tag from Jack since no other comments.
And I am wondering if we can make progress with this series, hence I removed 
RFC from subject.

Thanks,
Guoqing

RFC V4: https://marc.info/?l=linux-block&m=161027198729158&w=2
* rebase with latest code.

RFC V3: https://marc.info/?l=linux-block&m=159730633416534&w=2
* Move the #ifdef CONFIG_BLK_ADDITIONAL_DISKSTAT into the function body
  per Johannes's comment.
* Tweak the output of two tables to make they are more intuitive

RFC V2: https://marc.info/?l=linux-block&m=159467483514062&w=2
* don't call ktime_get_ns and drop unnecessary patches.
* add io_extra_stats to avoid potential overhead.

RFC V1: https://marc.info/?l=linux-block&m=159419516730386&w=2

Guoqing Jiang (4):
  block: add a statistic table for io latency
  block: add a statistic table for io sector
  block: add io_extra_stats node
  block: call blk_additional_{latency,sector} only when io_extra_stats
    is true

 Documentation/ABI/testing/sysfs-block | 26 +++++++++
 Documentation/block/queue-sysfs.rst   |  6 +++
 block/Kconfig                         |  9 ++++
 block/blk-core.c                      | 51 ++++++++++++++++++
 block/blk-sysfs.c                     | 10 ++++
 block/genhd.c                         | 78 +++++++++++++++++++++++++++
 include/linux/blkdev.h                |  6 +++
 include/linux/part_stat.h             |  8 +++
 8 files changed, 194 insertions(+)

-- 
2.17.1




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