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Waiman Long d37192627f blk-cgroup: Properly propagate the iostat update up the hierarchy 
[ Upstream commit 9d230c0996 ]

During a cgroup_rstat_flush() call, the lowest level of nodes are flushed
first before their parents. Since commit 3b8cc62987 ("blk-cgroup:
Optimize blkcg_rstat_flush()"), iostat propagation was still done to
the parent. Grandparent, however, may not get the iostat update if the
parent has no blkg_iostat_set queued in its lhead lockless list.

Fix this iostat propagation problem by queuing the parent's global
blkg->iostat into one of its percpu lockless lists to make sure that
the delta will always be propagated up to the grandparent and so on
toward the root blkcg.

Note that successive calls to __blkcg_rstat_flush() are serialized by
the cgroup_rstat_lock. So no special barrier is used in the reading
and writing of blkg->iostat.lqueued.

Fixes: 3b8cc62987 ("blk-cgroup: Optimize blkcg_rstat_flush()")
Reported-by: Dan Schatzberg <schatzberg.dan@gmail.com>
Closes: https://lore.kernel.org/lkml/ZkO6l%2FODzadSgdhC@dschatzberg-fedora-PF3DHTBV/
Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20240515143059.276677-1-longman@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-06-12 11:39:37 +02:00
arch KVM: arm64: Destroy mpidr_data for 'late' vCPU creation 2024-06-12 11:39:35 +02:00
block blk-cgroup: Properly propagate the iostat update up the hierarchy 2024-06-12 11:39:37 +02:00
certs This update includes the following changes: 2023-11-02 16:15:30 -10:00
crypto KEYS: asymmetric: Add missing dependencies of FIPS_SIGNATURE_SELFTEST 2024-05-30 09:44:03 +02:00
Documentation dt-bindings: PCI: rockchip,rk3399-pcie: Add missing maxItems to ep-gpios 2024-06-12 11:39:25 +02:00
drivers drm/nouveau: use tile_mode and pte_kind for VM_BIND bo allocations 2024-06-12 11:39:36 +02:00
fs fs/ntfs3: Use variable length array instead of fixed size 2024-06-12 11:39:29 +02:00
include Bluetooth: ISO: Handle PA sync when no BIGInfo reports are generated 2024-06-12 11:39:36 +02:00
init printk: Fix LOG_CPU_MAX_BUF_SHIFT when BASE_SMALL is enabled 2024-06-12 11:39:35 +02:00
io_uring io_uring/net: fix sendzc lazy wake polling 2024-05-30 09:44:09 +02:00
ipc sysctl changes for v6.9-rc1 2024-03-18 14:59:13 -07:00
kernel sched/core: Fix incorrect initialization of the 'burst' parameter in cpu_max_write() 2024-05-30 09:45:03 +02:00
lib string: Prepare to merge strcat KUnit tests into string_kunit.c 2024-06-12 11:39:30 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/userfaultfd: Do not place zeropages when zeropages are disallowed 2024-05-30 09:44:07 +02:00
net Bluetooth: L2CAP: Fix div-by-zero in l2cap_le_flowctl_init() 2024-06-12 11:39:37 +02:00
rust rust: remove params from module macro example 2024-04-25 17:34:33 +02:00
samples samples/landlock: Fix incorrect free in populate_ruleset_net 2024-05-30 09:45:01 +02:00
scripts s390/vdso: Create .build-id links for unstripped vdso files 2024-06-12 11:39:23 +02:00
security KEYS: trusted: Do not use WARN when encode fails 2024-05-25 16:30:55 +02:00
sound ALSA: hda/realtek: Drop doubly quirk entry for 103c:8a2e 2024-06-12 11:39:36 +02:00
tools selftests/powerpc/dexcr: Add -no-pie to hashchk tests 2024-06-12 11:39:34 +02:00
usr Kbuild updates for v6.8 2024-01-18 17:57:07 -08:00
virt KVM: Drop unused @may_block param from gfn_to_pfn_cache_invalidate_start() 2024-04-11 12:58:53 -07:00
.clang-format clang-format: Update with v6.7-rc4's for_each macro list 2023-12-08 23:54:38 +01:00
.cocciconfig
.editorconfig Add .editorconfig file for basic formatting 2023-12-28 16:22:47 +09:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: create a list of all built DTB files 2024-02-19 18:20:39 +09:00
.mailmap 18 hotfixes, 7 of which are cc:stable. 2024-05-10 14:16:03 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Drop Gustavo Pimentel as PCI DWC Maintainer 2024-03-27 13:41:02 -05:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS 18 hotfixes, 7 of which are cc:stable. 2024-05-10 14:16:03 -07:00
Makefile Linux 6.9.3 2024-05-30 09:45:04 +02:00
README README: Fix spelling 2024-03-18 03:36:32 -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 reStructuredText 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.