Re: [PATCH for-6.2/block V3 1/2] block: Data type conversion for IO accounting

[Sagi Grimberg <sagi@grimberg.me>]

On 12/21/22 06:05, Gulam Mohamed wrote:
> Change the data type of start and end time IO accounting variables in,
> block layer, from "unsigned long" to "u64". This is to enable nano-seconds
> granularity, in next commit, for the devices whose latency is less than
> milliseconds.
> 
> Changes from V2 to V3
> =====================
> 1. Changed all the required variables data-type to u64 as part of this
>     first patch
> 2. Create a new setting '2' for iostats in sysfs in next patch
> 3. Change the code to get the ktime values when iostat=2 in next patch
> 
> Signed-off-by: Gulam Mohamed <gulam.mohamed@oracle.com>
> ---
>   block/blk-core.c              | 24 ++++++++++++------------
>   block/blk.h                   |  2 +-
>   drivers/block/drbd/drbd_int.h |  2 +-
>   drivers/block/zram/zram_drv.c |  4 ++--
>   drivers/md/bcache/request.c   | 10 +++++-----
>   drivers/md/dm-core.h          |  2 +-
>   drivers/md/dm.c               |  2 +-
>   drivers/md/md.h               |  2 +-
>   drivers/md/raid1.h            |  2 +-
>   drivers/md/raid10.h           |  2 +-
>   drivers/md/raid5.c            |  2 +-
>   drivers/nvdimm/btt.c          |  2 +-
>   drivers/nvdimm/pmem.c         |  2 +-
>   include/linux/blk_types.h     |  2 +-
>   include/linux/blkdev.h        | 12 ++++++------
>   include/linux/part_stat.h     |  2 +-

nvme-mpath now also has stats, so struct nvme_request should also be
updated.