Waiman Long 2125c0034c cgroup/cpuset: Make cpuset hotplug processing synchronous ... Since commit 3a5a6d0c2b03("cpuset: don't nest cgroup_mutex inside get_online_cpus()"), cpuset hotplug was done asynchronously via a work function. This is to avoid recursive locking of cgroup_mutex. Since then, the cgroup locking scheme has changed quite a bit. A cpuset_mutex was introduced to protect cpuset specific operations. The cpuset_mutex is then replaced by a cpuset_rwsem. With commit d74b27d63a8b ("cgroup/cpuset: Change cpuset_rwsem and hotplug lock order"), cpu_hotplug_lock is acquired before cpuset_rwsem. Later on, cpuset_rwsem is reverted back to cpuset_mutex. All these locking changes allow the hotplug code to call into cpuset core directly. The following commits were also merged due to the asynchronous nature of cpuset hotplug processing. - commit b22afcdf04c9 ("cpu/hotplug: Cure the cpusets trainwreck") - commit 50e76632339d ("sched/cpuset/pm: Fix cpuset vs. suspend-resume bugs") - commit 28b89b9e6f7b ("cpuset: handle race between CPU hotplug and cpuset_hotplug_work") Clean up all these bandages by making cpuset hotplug processing synchronous again with the exception that the call to cgroup_transfer_tasks() to transfer tasks out of an empty cgroup v1 cpuset, if necessary, will still be done via a work function due to the existing cgroup_mutex -> cpu_hotplug_lock dependency. It is possible to reverse that dependency, but that will require updating a number of different cgroup controllers. This special hotplug code path should be rarely taken anyway. As all the cpuset states will be updated by the end of the hotplug operation, we can revert most the above commits except commit 50e76632339d ("sched/cpuset/pm: Fix cpuset vs. suspend-resume bugs") which is partially reverted. Also removing some cpus_read_lock trylock attempts in the cpuset partition code as they are no longer necessary since the cpu_hotplug_lock is now held for the whole duration of the cpuset hotplug code path. Signed-off-by: Waiman Long <longman@redhat.com> Tested-by: Valentin Schneider <vschneid@redhat.com> Signed-off-by: Tejun Heo <tj@kernel.org>		2024-04-08 07:39:16 -10:00
..
bpf	bpf: report RCU QS in cpumap kthread	2024-03-20 21:05:43 -07:00
cgroup	cgroup/cpuset: Make cpuset hotplug processing synchronous	2024-04-08 07:39:16 -10:00
configs	Networking changes for 6.9.	2024-03-12 17:44:08 -07:00
debug	kdb: Fix a potential buffer overflow in kdb_local()	2024-01-17 17:19:06 +00:00
dma	dma-mapping fixes for Linux 6.9	2024-03-24 10:45:31 -07:00
entry	entry: Respect changes to system call number by trace_sys_enter()	2024-03-12 13:23:32 +01:00
events	- Sumanth Korikkar has taught s390 to allocate hotplug-time page frames	2024-03-14 17:43:30 -07:00
futex	futex: Prevent the reuse of stale pi_state	2024-01-19 12:58:17 +01:00
gcov	gcov: annotate struct gcov_iterator with __counted_by	2023-10-18 14:43:22 -07:00
irq	Updates for the MSI interrupt subsystem and RISC-V initial MSI support:	2024-03-11 14:03:03 -07:00
kcsan	mm: delete checks for xor_unlock_is_negative_byte()	2023-10-18 14:34:17 -07:00
livepatch	livepatch: Fix missing newline character in klp_resolve_symbols()	2023-09-20 11:24:18 +02:00
locking	locking/rtmutex: Use try_cmpxchg_relaxed() in mark_rt_mutex_waiters()	2024-03-01 13:02:05 +01:00
module	Kbuild updates for v6.9	2024-03-21 14:41:00 -07:00
power	cgroup/cpuset: Make cpuset hotplug processing synchronous	2024-04-08 07:39:16 -10:00
printk	TTY/Serial driver update for 6.9-rc1	2024-03-21 12:44:10 -07:00
rcu	Merge branches 'rcu-doc.2024.02.14a', 'rcu-nocb.2024.02.14a', 'rcu-exp.2024.02.14a', 'rcu-tasks.2024.02.26a' and 'rcu-misc.2024.02.14a' into rcu.2024.02.26a	2024-02-26 17:37:25 -08:00
sched	RISC-V Patches for the 6.9 Merge Window	2024-03-22 10:41:13 -07:00
time	Two regression fixes for the timer and timer migration code:	2024-03-23 14:49:25 -07:00
trace	tracing: Use div64_u64() instead of do_div()	2024-03-18 10:33:06 -04:00
.gitignore
acct.c	fs: rename __mnt_{want,drop}_write*() helpers	2023-09-11 15:05:50 +02:00
async.c	async: Use a dedicated unbound workqueue with raised min_active	2024-02-09 11:13:59 -10:00
audit_fsnotify.c
audit_tree.c	As usual, lots of singleton and doubleton patches all over the tree and	2023-11-02 20:53:31 -10:00
audit_watch.c	audit: don't WARN_ON_ONCE(!current->mm) in audit_exe_compare()	2023-11-14 17:34:27 -05:00
audit.c	audit: use KMEM_CACHE() instead of kmem_cache_create()	2024-01-25 10:12:22 -05:00
audit.h	audit: correct audit_filter_inodes() definition	2023-07-21 12:17:25 -04:00
auditfilter.c	audit: remove unnecessary assignment in audit_dupe_lsm_field()	2024-01-25 09:59:27 -05:00
auditsc.c	audit,io_uring: io_uring openat triggers audit reference count underflow	2023-10-13 18:34:46 +02:00
backtracetest.c	backtracetest: Convert from tasklet to BH workqueue	2024-02-05 13:22:34 -10:00
bounds.c	bounds: support non-power-of-two CONFIG_NR_CPUS	2024-02-22 15:38:51 -08:00
capability.c	lsm: constify the 'target' parameter in security_capget()	2023-08-08 16:48:47 -04:00
cfi.c
compat.c
configs.c
context_tracking.c	context_tracking: Fix kerneldoc headers for __ct_user_{enter,exit}()	2024-02-14 07:53:50 -08:00
cpu_pm.c
cpu.c	cgroup/cpuset: Make cpuset hotplug processing synchronous	2024-04-08 07:39:16 -10:00
crash_core.c	crash: split crash dumping code out from kexec_core.c	2024-02-23 17:48:22 -08:00
crash_reserve.c	kexec: split crashkernel reservation code out from crash_core.c	2024-02-23 17:48:21 -08:00
cred.c	cred: Use KMEM_CACHE() instead of kmem_cache_create()	2024-02-23 17:33:31 -05:00
delayacct.c
dma.c
elfcorehdr.c	crash: remove dependency of FA_DUMP on CRASH_DUMP	2024-02-23 17:48:22 -08:00
exec_domain.c
exit.c	vfs-6.9.pidfd	2024-03-11 10:21:06 -07:00
exit.h	exit: add internal include file with helpers	2023-09-21 12:03:50 -06:00
extable.c
fail_function.c
fork.c	RCU pull request for v6.9	2024-03-11 12:02:50 -07:00
freezer.c	Linux 6.7-rc6	2023-12-23 15:52:13 +01:00
gen_kheaders.sh
groups.c	groups: Convert group_info.usage to refcount_t	2023-09-29 11:28:39 -07:00
hung_task.c	kernel/hung_task.c: export sysctl_hung_task_timeout_secs	2024-03-13 21:22:04 -04:00
iomem.c	kernel/iomem.c: remove __weak ioremap_cache helper	2023-08-21 13:37:28 -07:00
irq_work.c
jump_label.c
kallsyms_internal.h
kallsyms_selftest.c	mm/vmalloc: remove vmap_area_list	2024-02-23 17:48:19 -08:00
kallsyms_selftest.h
kallsyms.c	kallsyms: Change func signature for cleanup_symbol_name()	2023-08-25 15:00:36 -07:00
kcmp.c	file: convert to SLAB_TYPESAFE_BY_RCU	2023-10-19 11:02:48 +02:00
Kconfig.freezer
Kconfig.hz
Kconfig.kexec	crash: clean up kdump related config items	2024-02-23 17:48:22 -08:00
Kconfig.locks
Kconfig.preempt
kcov.c
kexec_core.c	- Kuan-Wei Chiu has developed the well-named series "lib min_heap: Min	2024-03-14 18:03:09 -07:00
kexec_elf.c
kexec_file.c	arm64, crash: wrap crash dumping code into crash related ifdefs	2024-02-23 17:48:23 -08:00
kexec_internal.h	crash: remove dependency of FA_DUMP on CRASH_DUMP	2024-02-23 17:48:22 -08:00
kexec.c	crash: split crash dumping code out from kexec_core.c	2024-02-23 17:48:22 -08:00
kheaders.c
kprobes.c	kprobes: Remove unnecessary initial values of variables	2024-02-08 23:29:29 +09:00
ksyms_common.c
ksysfs.c	Driver core changes for 6.9-rc1	2024-03-21 13:34:15 -07:00
kthread.c	As usual, lots of singleton and doubleton patches all over the tree and	2023-11-02 20:53:31 -10:00
latencytop.c
Makefile	crash: split crash dumping code out from kexec_core.c	2024-02-23 17:48:22 -08:00
module_signature.c
notifier.c
nsproxy.c	pidfd: add pidfs	2024-03-01 12:23:37 +01:00
numa.c	kernel/numa.c: Move logging out of numa.h	2023-12-20 19:26:30 -05:00
padata.c	Author: Gang Li padata: dispatch works on	2024-03-06 13:04:17 -08:00
panic.c	- Kuan-Wei Chiu has developed the well-named series "lib min_heap: Min	2024-03-14 18:03:09 -07:00
params.c	params: Fix multi-line comment style	2023-12-01 09:51:44 -08:00
pid_namespace.c	wait: Remove uapi header file from main header file	2023-12-20 19:26:31 -05:00
pid_sysctl.h	memfd: replace ratcheting feature from vm.memfd_noexec with hierarchy	2023-08-21 13:37:59 -07:00
pid.c	pidfs: remove config option	2024-03-13 12:53:53 -07:00
profile.c
ptrace.c	ptrace_attach: shift send(SIGSTOP) into ptrace_set_stopped()	2024-02-22 15:38:52 -08:00
range.c
reboot.c	Thermal control updates for 6.8-rc1	2024-01-09 16:20:17 -08:00
regset.c
relay.c	kernel: relay: remove relay_file_splice_read dead code, doesn't work	2023-12-29 12:22:27 -08:00
resource_kunit.c
resource.c	Quite a lot of kexec work this time around. Many singleton patches in	2024-01-09 11:46:20 -08:00
rseq.c
scftorture.c	scftorture: Pause testing after memory-allocation failure	2023-07-14 15:02:57 -07:00
scs.c
seccomp.c	file: remove __receive_fd()	2023-12-12 14:24:14 +01:00
signal.c	- Kuan-Wei Chiu has developed the well-named series "lib min_heap: Min	2024-03-14 18:03:09 -07:00
smp.c	CSD lock commits for v6.7	2023-10-30 17:56:53 -10:00
smpboot.c	kthread: add kthread_stop_put	2023-10-04 10:41:57 -07:00
smpboot.h
softirq.c	workqueue: Drain BH work items on hot-unplugged CPUs	2024-02-29 11:51:24 -10:00
stackleak.c
stacktrace.c	stacktrace: fix kernel-doc typo	2023-12-29 12:22:29 -08:00
static_call_inline.c
static_call.c
stop_machine.c
sys_ni.c	lsm/stable-6.8 PR 20240105	2024-01-09 12:57:46 -08:00
sys.c	getrusage: use sig->stats_lock rather than lock_task_sighand()	2024-02-07 21:20:32 -08:00
sysctl-test.c
sysctl.c	tracing: Support to dump instance traces by ftrace_dump_on_oops	2024-03-18 10:33:06 -04:00
task_work.c	task_work: add kerneldoc annotation for 'data' argument	2023-09-19 13:21:32 -07:00
taskstats.c	taskstats: fill_stats_for_tgid: use for_each_thread()	2023-10-04 10:41:57 -07:00
torture.c	torture: Print out torture module parameters	2023-09-24 17:24:01 +02:00
tracepoint.c
tsacct.c
ucount.c	sysctl: Add size to register_sysctl	2023-08-15 15:26:17 -07:00
uid16.c
uid16.h
umh.c	sysctl: fix unused proc_cap_handler() function warning	2023-06-29 15:19:43 -07:00
up.c	smp: Change function signatures to use call_single_data_t	2023-09-13 14:59:24 +02:00
user_namespace.c	user_namespace: remove unnecessary NULL values from kbuf	2024-02-22 15:38:52 -08:00
user-return-notifier.c
user.c	binfmt_misc: enable sandboxed mounts	2023-10-11 08:46:01 -07:00
usermode_driver.c
utsname_sysctl.c
utsname.c
vhost_task.c
vmcore_info.c	crash_core: export vmemmap when CONFIG_SPARSEMEM_VMEMMAP is enabled	2024-03-04 17:01:27 -08:00
watch_queue.c	watch_queue: fix kcalloc() arguments order	2023-12-21 13:17:54 +01:00
watchdog_buddy.c
watchdog_perf.c
watchdog.c	watchdog/core: remove sysctl handlers from public header	2024-03-12 13:09:23 -07:00
workqueue_internal.h	workqueue: Drop the special locking rule for worker->flags and worker_pool->flags	2023-08-07 15:57:22 -10:00
workqueue.c	Driver core changes for 6.9-rc1	2024-03-21 13:34:15 -07:00