linux-kernel - [PATCH v3 0/3] block/diskstats: more accurate io

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Date:   Tue, 24 Mar 2020 09:39:38 +0300
From:   Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:     linux-block@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        linux-kernel@...r.kernel.org
Cc:     Mikulas Patocka <mpatocka@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Ming Lei <ming.lei@...hat.com>
Subject: [PATCH v3 0/3] block/diskstats: more accurate io_ticks and
 optimization

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:
 * update documentation
 * rebase to current linux-next
 * fix compilation for CONFIG_SMP=n

---

Konstantin Khlebnikov (3):
      block/diskstats: more accurate approximation of io_ticks for slow disks
      block/diskstats: accumulate all per-cpu counters in one pass
      block/diskstats: replace time_in_queue with sum of request times


 Documentation/admin-guide/iostats.rst |    5 ++-
 block/bio.c                           |    9 ++---
 block/blk-core.c                      |    5 +--
 block/genhd.c                         |   64 +++++++++++++++++++++++++--------
 block/partition-generic.c             |   39 ++++++++++++--------
 include/linux/genhd.h                 |   14 +++++--
 6 files changed, 90 insertions(+), 46 deletions(-)

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