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Zhang Wensheng 3ee3e7021b block: update io_ticks when io hang 
[ Upstream commit 86d7331299 ]

When the inflight IOs are slow and no new IOs are issued, we expect
iostat could manifest the IO hang problem. However after
commit 5b18b5a737 ("block: delete part_round_stats and switch to less
precise counting"), io_tick and time_in_queue will not be updated until
the end of IO, and the avgqu-sz and %util columns of iostat will be zero.

Because it has using stat.nsecs accumulation to express time_in_queue
which is not suitable to change, and may %util will express the status
better when io hang occur. To fix io_ticks, we use update_io_ticks and
inflight to update io_ticks when diskstats_show and part_stat_show
been called.

Fixes: 5b18b5a737 ("block: delete part_round_stats and switch to less precise counting")
Signed-off-by: Zhang Wensheng <zhangwensheng5@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220217064247.4041435-1-zhangwensheng5@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-04-08 13:57:35 +02:00
arch arm64/mm: avoid fixmap race condition when create pud mapping 2022-04-08 13:57:34 +02:00
block block: update io_ticks when io hang 2022-04-08 13:57:35 +02:00
certs certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 2022-01-23 00:08:44 +09:00
crypto crypto: authenc - Fix sleep in atomic context in decrypt_tail 2022-04-08 13:57:32 +02:00
Documentation security: add sctp_assoc_established hook 2022-04-08 13:57:34 +02:00
drivers crypto: rockchip - ECB does not need IV 2022-04-08 13:57:34 +02:00
fs btrfs: verify the tranisd of the to-be-written dirty extent buffer 2022-04-08 13:57:30 +02:00
include security: add sctp_assoc_established hook 2022-04-08 13:57:34 +02:00
init lib/stackdepot: allow optional init and stack_table allocation by kvmalloc() 2022-01-22 08:33:37 +02:00
ipc ipc/sem: do not sleep with a spin lock held 2022-02-04 09:25:05 -08:00
kernel tracing: Have trace event string test handle zero length strings 2022-04-08 13:57:23 +02:00
lib lib/raid6/test: fix multiple definition linking error 2022-04-08 13:57:28 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm/kmemleak: reset tag when compare object pointer 2022-04-08 13:57:23 +02:00
net security: add sctp_assoc_established hook 2022-04-08 13:57:34 +02:00
samples samples/landlock: Fix path_list memory leak 2022-04-08 13:57:25 +02:00
scripts kconfig: fix failing to generate auto.conf 2022-02-12 23:24:19 +09:00
security security: implement sctp_assoc_established hook in selinux 2022-04-08 13:57:34 +02:00
sound ASoC: SOF: Intel: Fix NULL ptr dereference when ENOMEM 2022-04-08 13:57:25 +02:00
tools selftests/sgx: Treat CC as one argument 2022-04-08 13:57:34 +02:00
usr kbuild: remove include/linux/cyclades.h from header file check 2022-01-27 08:51:08 +01:00
virt KVM: Fix lockdep false negative during host resume 2022-02-17 09:52:50 -05:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap MAINTAINERS: Update Jisheng's email address 2022-03-08 17:30:32 +01:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Add Paolo Abeni to networking maintainers 2022-03-15 12:16:10 -07:00
Makefile Linux 5.17.1 2022-03-28 10:03:22 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.