Hi, No more comments since the last version, so this version is just rebase with latest tree. To make the tables work, it is necessary to enable BLK_ADDITIONAL_DISKSTAT option, and also enable the sysfs node. # echo 1 > /sys/block/md0/queue/io_extra_stats After that, the size and latency of io are recorded in each table. Thanks, Guoqing 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
