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Subject: Re: [PATCH v4 0/3] block/diskstats: more accurate io_ticks and
 optimization
To:     Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
        linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     Mikulas Patocka <mpatocka@redhat.com>,
        Mike Snitzer <snitzer@redhat.com>,
        Ming Lei <ming.lei@redhat.com>
References: <158514148436.7009.1234367408038809210.stgit@buzz>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <0d8e3459-6d67-72ae-c1df-5335d2a49bf7@kernel.dk>
Date:   Wed, 25 Mar 2020 08:49:38 -0600
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On 3/25/20 7:07 AM, Konstantin Khlebnikov wrote:
> Simplified estimation for io_ticks introduced in patch
> https://lore.kernel.org/linux-block/20181206164122.2166-5-snitzer@redhat.com/
> could be very inaccurate for request longer than jiffy (i.e. any HDD)
> 
> There is at least one another report about this:
> https://lore.kernel.org/linux-block/20200324031942.GA3060@ming.t460p/
> See detail in comment for first patch.
> 
> v1: https://lore.kernel.org/lkml/155413438394.3201.15211440151043943989.stgit@buzz/
> v2: https://lore.kernel.org/lkml/158314549775.1788.6529015932237292177.stgit@buzz/
> v3: https://lore.kernel.org/lkml/158503038812.1955.7827988255138056389.stgit@buzz/
>  * update documentation
>  * rebase to current linux-next
>  * fix compilation for CONFIG_SMP=n
> v4:
>  * rebase to for-5.7/block
>  * make part_stat_read_all static in block/genhd.c

Applied for 5.7, thanks.

-- 
Jens Axboe