Hi, Now, a new io_extra_stats node is introduced which works with the config option. with the double insurance, I think no one will suffer from the additional overhead unless people really need the statistic tables. And I will delete the kernel option if it doesn't make sense to have both kernel option and sysfs node. Review and comment are welcomed. Thanks, Guoqing RFC V1 -> RFC V2: * don't call ktime_get_ns and drop unnecessary patches. * add io_extra_stats to avoid potential overhead. RFC V1 at 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/block/queue-sysfs.rst | 6 ++++ block/Kconfig | 9 +++++ block/blk-core.c | 54 +++++++++++++++++++++++++++++ block/blk-sysfs.c | 8 +++++ block/genhd.c | 47 +++++++++++++++++++++++++ include/linux/blkdev.h | 2 ++ include/linux/part_stat.h | 8 +++++ 7 files changed, 134 insertions(+) -- 2.17.1
