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

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Date:   Sun, 25 Dec 2022 13:40:23 +0200
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Gulam Mohamed <gulam.mohamed@...cle.com>,
        linux-block@...r.kernel.org
Cc:     axboe@...nel.dk, philipp.reisner@...bit.com,
        lars.ellenberg@...bit.com, christoph.boehmwalder@...bit.com,
        minchan@...nel.org, ngupta@...are.org, senozhatsky@...omium.org,
        colyli@...e.de, kent.overstreet@...il.com, agk@...hat.com,
        snitzer@...nel.org, dm-devel@...hat.com, song@...nel.org,
        dan.j.williams@...el.com, vishal.l.verma@...el.com,
        dave.jiang@...el.com, ira.weiny@...el.com, junxiao.bi@...cle.com,
        martin.petersen@...cle.com, kch@...dia.com,
        drbd-dev@...ts.linbit.com, linux-kernel@...r.kernel.org,
        linux-bcache@...r.kernel.org, linux-raid@...r.kernel.org,
        nvdimm@...ts.linux.dev, konrad.wilk@...cle.com, joe.jin@...cle.com,
        rajesh.sivaramasubramaniom@...cle.com, shminderjit.singh@...cle.com
Subject: Re: [PATCH for-6.2/block V3 1/2] block: Data type conversion for IO
 accounting



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@...cle.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.