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Phil Auld 6432e163ba sched/isolation: Make use of more than one housekeeping cpu 
The exising code uses housekeeping_any_cpu() to select a cpu for
a given housekeeping task. However, this often ends up calling
cpumask_any_and() which is defined as cpumask_first_and() which has
the effect of alyways using the first cpu among those available.

The same applies when multiple NUMA nodes are involved. In that
case the first cpu in the local node is chosen which does provide
a bit of spreading but with multiple HK cpus per node the same
issues arise.

We have numerous cases where a single HK cpu just cannot keep up
and the remote_tick warning fires. It also can lead to the other
things (orchastration sw, HA keepalives etc) on the HK cpus getting
starved which leads to other issues.  In these cases we recommend
increasing the number of HK cpus.  But... that only helps the
userspace tasks somewhat. It does not help the actual housekeeping
part.

Spread the HK work out by having housekeeping_any_cpu() and
sched_numa_find_closest() use cpumask_any_and_distribute()
instead of cpumask_any_and().

Signed-off-by: Phil Auld <pauld@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Waiman Long <longman@redhat.com>
Reviewed-by: Vishal Chourasia <vishalc@linux.ibm.com>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20250218184618.1331715-1-pauld@redhat.com
2025-04-08 20:55:55 +02:00
..
bpf bpf_try_alloc_pages 2025-03-30 13:45:28 -07:00
cgroup Driver core updates for 6.15-rc1 2025-04-01 11:02:03 -07:00
configs - The 6 patch series "Enable strict percpu address space checks" from 2025-04-01 09:29:18 -07:00
debug TTY/Serial driver updates for 6.15-rc1 2025-04-02 18:17:33 -07:00
dma dma-mapping: fix missing clear bdr in check_ram_in_range_map() 2025-03-12 13:41:44 +01:00
entry Objtool changes for v6.15: 2025-03-24 21:18:05 -07:00
events - The 6 patch series "Enable strict percpu address space checks" from 2025-04-01 09:29:18 -07:00
futex futex: Use a hashmask instead of hashsize 2025-02-26 16:07:59 +01:00
gcov gcov: clang: use correct function param names 2025-01-24 22:47:27 -08:00
irq Revert "Merge tag 'irq-msi-2025-03-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip" 2025-03-28 11:22:54 -07:00
kcsan kcsan: Remove redundant call of kallsyms_lookup_name() 2024-10-14 16:44:56 +02:00
livepatch Modules changes for 6.15-rc1 2025-03-30 15:44:36 -07:00
locking - The 7 patch series "powerpc/crash: use generic crashkernel 2025-04-01 10:06:52 -07:00
module ring-buffer updates for v6.15 2025-03-31 13:37:22 -07:00
power This update includes the following changes: 2025-03-29 10:01:55 -07:00
printk printk changes for 6.15 2025-03-27 19:22:24 -07:00
rcu RCU fixes for v6.15: 2025-04-02 10:04:48 -07:00
sched sched/isolation: Make use of more than one housekeeping cpu 2025-04-08 20:55:55 +02:00
time Networking changes for 6.15. 2025-03-26 21:48:21 -07:00
trace more printk changes for 6.15 2025-04-02 10:05:55 -07:00
.gitignore
acct.c acct: block access to kernel internal filesystems 2025-02-12 12:24:16 +01:00
async.c
audit.c audit: Initialize lsmctx to avoid memory allocation error 2025-01-29 20:02:04 -05:00
audit.h audit: change context data from secid to lsm_prop 2024-10-11 14:34:16 -04:00
audit_fsnotify.c
audit_tree.c
audit_watch.c VFS: change kern_path_locked() and user_path_locked_at() to never return negative dentry 2025-02-19 14:08:41 +01:00
auditfilter.c audit: fix suffixed '/' filename matching 2024-12-05 19:22:38 -05:00
auditsc.c fs: dedup handling of struct filename init and refcounts bumps 2025-03-18 15:34:27 +01:00
backtracetest.c
bounds.c
capability.c capability: Remove unused has_capability 2025-03-07 22:03:09 -06:00
cfi.c Modules changes for 6.15-rc1 2025-03-30 15:44:36 -07:00
compat.c
configs.c
context_tracking.c context_tracking: Make RCU watch ct_kernel_exit_state() warning 2025-03-04 18:44:29 -08:00
cpu.c hyperv-next for 6.15 2025-03-25 14:47:04 -07:00
cpu_pm.c
crash_core.c crash: Use note name macros 2025-02-10 16:56:58 -08:00
crash_reserve.c crash: remove an unused argument from reserve_crashkernel_generic() 2025-03-16 22:30:47 -07:00
cred.c cred: remove old {override,revert}_creds() helpers 2024-12-02 11:25:09 +01:00
delayacct.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
dma.c
elfcorehdr.c
exec_domain.c
exit.c sched/tracepoints: Move and extend the sched_process_exit() tracepoint 2025-04-04 10:30:19 +02:00
exit.h
extable.c
fail_function.c
fork.c - The 7 patch series "powerpc/crash: use generic crashkernel 2025-04-01 10:06:52 -07:00
freezer.c sched/fair: Fix external p->on_rq users 2024-10-14 09:14:35 +02:00
gen_kheaders.sh Kbuild updates for v6.14 2025-01-31 12:07:07 -08:00
groups.c
hung_task.c hung_task: show the blocker task if the task is hung on mutex 2025-03-21 22:10:04 -07:00
iomem.c mm/memremap: Pass down MEMREMAP_* flags to arch_memremap_wb() 2025-02-21 15:05:38 +01:00
irq_work.c kasan: make kasan_record_aux_stack_noalloc() the default behaviour 2025-01-13 22:40:36 -08:00
jump_label.c jump_label: Use RCU in all users of __module_text_address(). 2025-03-10 11:54:46 +01:00
kallsyms.c kallsyms: Remove KALLSYMS_ABSOLUTE_PERCPU 2025-02-18 10:16:04 +01:00
kallsyms_internal.h
kallsyms_selftest.c kallsyms: Use kthread_run_on_cpu() 2025-01-02 22:12:12 +01:00
kallsyms_selftest.h
kcmp.c kcmp: improve performance adding an unlikely hint to task comparisons 2025-02-21 10:25:33 +01:00
Kconfig.freezer
Kconfig.hz kernel: Fix "select" wording on HZ_250 description 2025-02-21 09:20:30 +01:00
Kconfig.kexec crash, powerpc: default to CRASH_DUMP=n on PPC_BOOK3S_32 2024-11-14 22:43:48 -08:00
Kconfig.locks
Kconfig.preempt sched: No PREEMPT_RT=y for all{yes,mod}config 2024-11-07 15:25:05 +01:00
kcov.c kcov: mark in_softirq_really() as __always_inline 2024-12-30 17:59:08 -08:00
kexec.c
kexec_core.c - The 7 patch series "powerpc/crash: use generic crashkernel 2025-04-01 10:06:52 -07:00
kexec_elf.c kexec: initialize ELF lowest address to ULONG_MAX 2025-03-16 22:30:47 -07:00
kexec_file.c crash: let arch decide usable memory range in reserved area 2025-03-16 22:30:47 -07:00
kexec_internal.h
kheaders.c kheaders: Simplify attribute through __BIN_ATTR_SIMPLE_RO() 2024-12-24 09:46:49 +01:00
kprobes.c kprobes: Use RCU in all users of __module_text_address(). 2025-03-10 11:54:46 +01:00
ksyms_common.c
ksysfs.c kernel/ksysfs.c: simplify bin_attribute definition 2025-01-07 16:59:15 +01:00
kthread.c kthread: Fix return value on kzalloc() failure in kthread_affine_preferred() 2025-02-04 01:42:27 +01:00
latencytop.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
Makefile tracing: Disable branch profiling in noinstr code 2025-03-22 09:49:26 +01:00
module_signature.c
notifier.c reboot: move reboot_notifier_list to kernel/reboot.c 2024-11-05 17:12:31 -08:00
nsproxy.c fdget(), trivial conversions 2024-11-03 01:28:06 -05:00
padata.c padata: switch padata_find_next() to using cpumask_next_wrap() 2025-02-24 16:37:23 -05:00
panic.c These are objtool fixes and updates by Josh Poimboeuf, centered 2025-04-02 10:30:10 -07:00
params.c params: Annotate struct module_param_attrs with __counted_by() 2025-03-10 11:54:46 +01:00
pid.c kernel-6.15-rc1.tasklist_lock 2025-03-24 13:39:27 -07:00
pid_namespace.c pid: Do not set pid_max in new pid namespaces 2025-03-06 10:18:36 +01:00
pid_sysctl.h treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
profile.c
ptrace.c
range.c
reboot.c - The 7 patch series "powerpc/crash: use generic crashkernel 2025-04-01 10:06:52 -07:00
regset.c
relay.c relay: use kasprintf() instead of fixed buffer formatting 2025-03-21 22:10:05 -07:00
resource.c resource: replace open coded variant of DEFINE_RES() 2025-03-21 22:10:05 -07:00
resource_kunit.c resource, kunit: fix user-after-free in resource_test_region_intersects() 2024-10-09 12:47:19 -07:00
rseq.c rseq: Fix segfault on registration when rseq_cs is non-zero 2025-03-06 22:26:49 +01:00
scftorture.c scftorture: Handle NULL argument passed to scf_add_to_free_list(). 2024-11-14 16:09:51 -08:00
scs.c
seccomp.c seccomp: avoid the lock trip seccomp_filter_release in common case 2025-02-24 11:17:10 -08:00
signal.c vfs-6.15-rc1.fixes 2025-04-02 16:05:21 -07:00
smp.c CSD-lock pull request for v6.14 2025-01-28 11:34:03 -08:00
smpboot.c
smpboot.h
softirq.c lockdep: Fix wait context check on softirq for PREEMPT_RT 2025-03-25 10:46:44 +01:00
stackleak.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
stacktrace.c
static_call.c
static_call_inline.c Modules changes for 6.15-rc1 2025-03-30 15:44:36 -07:00
stop_machine.c stop-machine: Add comment for rcu_momentary_eqs() 2025-03-11 10:15:52 -07:00
sys.c Updates for the core time/timer subsystem: 2025-03-25 10:33:23 -07:00
sys_ni.c
sysctl-test.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
sysctl.c s390 updates for 6.15 merge window 2025-03-29 11:59:43 -07:00
task_work.c kasan: make kasan_record_aux_stack_noalloc() the default behaviour 2025-01-13 22:40:36 -08:00
taskstats.c fdget(), more trivial conversions 2024-11-03 01:28:06 -05:00
torture.c torture: Add get_torture_init_jiffies() for test-start time 2025-02-05 07:14:24 -08:00
tracepoint.c tracepoint: Print the function symbol when tracepoint_debug is set 2025-03-21 15:30:10 -04:00
tsacct.c
ucount.c ucount: use rcuref_t for reference counting 2025-03-16 22:30:50 -07:00
uid16.c
uid16.h
umh.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
up.c
user-return-notifier.c
user.c
user_namespace.c uidgid: add map_id_range_up() 2025-02-12 12:12:27 +01:00
usermode_driver.c
utsname.c
utsname_sysctl.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
vhost_task.c vhost: return task creation error instead of NULL 2025-03-01 02:52:52 -05:00
vmcore_info.c
watch_queue.c vfs-6.15-rc1.pipe 2025-03-24 09:52:37 -07:00
watchdog.c A treewide hrtimer timer cleanup 2025-03-25 10:54:15 -07:00
watchdog_buddy.c
watchdog_perf.c - The 7 patch series "powerpc/crash: use generic crashkernel 2025-04-01 10:06:52 -07:00
workqueue.c workqueue: An update for v6.14-rc4 2025-02-26 14:22:47 -08:00
workqueue_internal.h