Peter Zijlstra 66951e4860 sched/fair: Fix update_cfs_group() vs DELAY_DEQUEUE ...

Normally dequeue_entities() will continue to dequeue an empty group entity;
except DELAY_DEQUEUE changes things -- it retains empty entities such that they
might continue to compete and burn off some lag.

However, doing this results in update_cfs_group() re-computing the cgroup
weight 'slice' for an empty group, which it (rightly) figures isn't much at
all. This in turn means that the delayed entity is not competing at the
expected weight. Worse, the very low weight causes its lag to be inflated,
which combined with avg_vruntime() using scale_load_down(), leads to artifacts.

As such, don't adjust the weight for empty group entities and let them compete
at their original weight.

Fixes: 152e11f6df29 ("sched/fair: Implement delayed dequeue")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20250110115720.GA17405@noisy.programming.kicks-ass.net

2025-01-13 13:50:56 +01:00

..

bpf

bpf: Fix bpf_get_smp_processor_id() on !CONFIG_SMP

2024-12-17 16:09:24 -08:00

cgroup

cgroup: Changes for v6.13

2024-11-20 09:54:49 -08:00

configs

configs/debug: make sure PROVE_RCU_LIST=y takes effect

2024-10-28 10:21:09 -07:00

debug

kdb: fix ctrl+e/a/f/b/d/p/n broken in keyboard mode

2024-11-18 15:20:22 +00:00

dma

dma-debug: fix physical address calculation for struct dma_debug_entry

2024-11-28 10:19:16 +01:00

entry

sched: Add TIF_NEED_RESCHED_LAZY infrastructure

2024-11-05 12:55:37 +01:00

events

- The series "resource: A couple of cleanups" from Andy Shevchenko

2024-11-25 16:09:48 -08:00

futex

futex: fix user access on powerpc

2024-12-09 10:00:25 -08:00

gcov

gcov: add support for GCC 14

2024-06-15 10:43:06 -07:00

irq

genirq/proc: Add missing space separator back

2024-12-03 14:59:34 +01:00

kcsan

kcsan: Remove redundant call of kallsyms_lookup_name()

2024-10-14 16:44:56 +02:00

livepatch

livepatch: Replace snprintf() with sysfs_emit()

2024-07-02 16:56:18 +02:00

locking

locking/rtmutex: Make sure we wake anything on the wake_q when we release the lock->wait_lock

2024-12-17 17:47:24 +01:00

module

module: Convert symbol namespace to string literal

2024-12-02 11:34:44 -08:00

power

The biggest change here is eliminating the awful idea that KVM had, of

2024-11-23 16:00:50 -08:00

printk

printk changes for 6.13

2024-11-20 09:21:11 -08:00

rcu

A set of updates for the interrupt subsystem:

2024-11-19 15:54:19 -08:00

sched

sched/fair: Fix update_cfs_group() vs DELAY_DEQUEUE

2025-01-13 13:50:56 +01:00

time

clocksource: Make negative motion detection more robust

2024-12-05 16:03:24 +01:00

trace

Fixes for ftrace in v6.13:

2025-01-03 10:04:43 -08:00

.gitignore

…

acct.c

kernel misc: Remove the now superfluous sentinel elements from ctl_table array

2024-04-24 09:43:53 +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

fsnotify: create a wrapper fsnotify_find_inode_mark()

2024-04-04 16:24:16 +02:00

audit_watch.c

fsnotify: create a wrapper fsnotify_find_inode_mark()

2024-04-04 16:24:16 +02:00

audit.c

lsm/stable-6.13 PR 20241112

2024-11-18 17:34:05 -08:00

audit.h

audit: change context data from secid to lsm_prop

2024-10-11 14:34:16 -04:00

auditfilter.c

audit: change context data from secid to lsm_prop

2024-10-11 14:34:16 -04:00

auditsc.c

audit: workaround a GCC bug triggered by task comm changes

2024-12-04 22:57:46 -05:00

backtracetest.c

backtracetest: add MODULE_DESCRIPTION()

2024-06-24 22:24:55 -07:00

bounds.c

bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS

2024-04-29 08:29:29 -07:00

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, rcu: Rename rcu_dyntick trace event into rcu_watching

2024-08-15 21:30:43 +05:30

cpu_pm.c

…

cpu.c

Driver core changes for 6.13-rc1

2024-11-29 11:43:29 -08:00

crash_core.c

kexec/crash: no crash update when kexec in progress

2024-11-05 17:12:27 -08:00

crash_reserve.c

crash: fix crash memory reserve exceed system memory bug

2024-09-01 20:43:30 -07:00

cred.c

cred: Add a light version of override/revert_creds()

2024-11-11 10:45:04 +01:00

delayacct.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

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

remove pointless includes of <linux/fdtable.h>

2024-10-07 13:34:41 -04:00

exit.h

exit: add internal include file with helpers

2023-09-21 12:03:50 -06:00

extable.c

…

fail_function.c

…

fork.c

fork: avoid inappropriate uprobe access to invalid mm

2024-12-18 19:04:44 -08:00

freezer.c

sched/fair: Fix external p->on_rq users

2024-10-14 09:14:35 +02:00

gen_kheaders.sh

kheaders: Ignore silly-rename files

2024-12-20 22:07:55 +01:00

groups.c

groups: Convert group_info.usage to refcount_t

2023-09-29 11:28:39 -07:00

hung_task.c

hung_task: add detect count for hung tasks

2024-11-11 17:17:03 -08:00

iomem.c

kernel/iomem.c: remove __weak ioremap_cache helper

2023-08-21 13:37:28 -07:00

irq_work.c

…

jump_label.c

jump_label: Fix static_key_slow_dec() yet again

2024-09-10 11:57:27 +02:00

kallsyms_internal.h

kallsyms: get rid of code for absolute kallsyms

2024-07-20 16:33:21 +09:00

kallsyms_selftest.c

kallsyms: Match symbols exactly with CONFIG_LTO_CLANG

2024-08-15 09:33:35 -07:00

kallsyms_selftest.h

…

kallsyms.c

kallsyms: Match symbols exactly with CONFIG_LTO_CLANG

2024-08-15 09:33:35 -07:00

kcmp.c

get rid of ...lookup...fdget_rcu() family

2024-10-07 13:34:41 -04:00

Kconfig.freezer

…

Kconfig.hz

…

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_core.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

kexec_elf.c

…

kexec_file.c

kexec_file: fix elfcorehdr digest exclusion when CONFIG_CRASH_HOTPLUG=y

2024-09-01 17:59:01 -07:00

kexec_internal.h

kexec: use atomic_try_cmpxchg_acquire() in kexec_trylock()

2024-09-01 20:43:23 -07:00

kexec.c

crash: add a new kexec flag for hotplug support

2024-04-23 14:59:01 +10:00

kheaders.c

…

kprobes.c

kprobes: Use struct_size() in __get_insn_slot()

2024-10-31 11:00:58 +09:00

ksyms_common.c

…

ksysfs.c

profiling: remove prof_cpu_mask

2024-07-29 10:45:54 -07:00

kthread.c

get rid of __get_task_comm()

2024-11-05 17:12:28 -08:00

latencytop.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

Makefile

mm: move kernel/numa.c to mm/

2024-09-03 21:15:26 -07:00

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: Clean up in padata_do_multithreaded()

2024-11-10 11:50:54 +08:00

panic.c

drm next for 6.12-rc1

2024-09-19 10:18:15 +02:00

params.c

params: Fix multi-line comment style

2023-12-01 09:51:44 -08:00

pid_namespace.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

pid_sysctl.h

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

pid.c

fdget(), more trivial conversions

2024-11-03 01:28:06 -05:00

profile.c

profiling: remove profile=sleep support

2024-08-04 13:36:28 -07:00

ptrace.c

ptrace_attach: shift send(SIGSTOP) into ptrace_set_stopped()

2024-02-22 15:38:52 -08:00

range.c

…

reboot.c

kernel/reboot: replace sprintf() with sysfs_emit()

2024-11-11 17:17:05 -08:00

regset.c

regset: use kvzalloc() for regset_get_alloc()

2024-04-25 21:07:03 -07:00

relay.c

[tree-wide] finally take no_llseek out

2024-09-27 08:18:43 -07:00

resource_kunit.c

resource, kunit: fix user-after-free in resource_test_region_intersects()

2024-10-09 12:47:19 -07:00

resource.c

module: Convert symbol namespace to string literal

2024-12-02 11:34:44 -08:00

rseq.c

…

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

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

signal.c

posix-timers: Target group sigqueue to current task only if not exiting

2024-11-29 13:19:09 +01:00

smp.c

locking/csd-lock: Switch from sched_clock() to ktime_get_mono_fast_ns()

2024-10-11 09:31:21 -07:00

smpboot.c

kthread: add kthread_stop_put

2023-10-04 10:41:57 -07:00

smpboot.h

…

softirq.c

softirq: Allow raising SCHED_SOFTIRQ from SMP-call-function on RT kernel

2024-12-02 12:01:27 +01:00

stackleak.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

stacktrace.c

stacktrace: fix kernel-doc typo

2023-12-29 12:22:29 -08:00

static_call_inline.c

x86/static-call: provide a way to do very early static-call updates

2024-12-13 09:28:32 +01:00

static_call.c

…

stop_machine.c

rcu: Rename rcu_momentary_dyntick_idle() into rcu_momentary_eqs()

2024-08-15 21:30:42 +05:30

sys_ni.c

Probes updates for v6.11:

2024-07-18 12:19:20 -07:00

sys.c

arm64 updates for 6.13:

2024-11-18 18:10:37 -08:00

sysctl-test.c

sysctl: Add module description to sysctl-testing

2024-06-03 15:20:37 +02:00

sysctl.c

sysctl: Reorganize kerneldoc parameter names

2024-10-23 15:28:40 +02:00

task_work.c

sched/core: Disable page allocation in task_tick_mm_cid()

2024-10-11 10:49:32 +02:00

taskstats.c

fdget(), more trivial conversions

2024-11-03 01:28:06 -05:00

torture.c

torture: Add MODULE_DESCRIPTION()

2024-05-30 15:31:38 -07:00

tracepoint.c

tracing: Fix syscall tracepoint use-after-free

2024-11-01 14:37:31 -04:00

tsacct.c

tsacct: replace strncpy() with strscpy()

2024-07-12 16:39:53 -07:00

ucount.c

Summary

2024-11-22 20:36:11 -08:00

uid16.c

…

uid16.h

…

umh.c

remove pointless includes of <linux/fdtable.h>

2024-10-07 13:34:41 -04:00

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: use kmemdup_array() instead of kmemdup() for multiple allocation

2024-09-09 16:47:42 -07:00

user-return-notifier.c

…

user.c

uidgid: make sure we fit into one cacheline

2024-09-12 12:16:09 +02:00

usermode_driver.c

…

utsname_sysctl.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

utsname.c

…

vhost_task.c

vhost_task: Handle SIGKILL by flushing work and exiting

2024-05-22 08:31:15 -04:00

vmcore_info.c

mm: support only one page_type per page

2024-09-03 21:15:43 -07:00

watch_queue.c

fdget(), trivial conversions

2024-11-03 01:28:06 -05:00

watchdog_buddy.c

…

watchdog_perf.c

watchdog/perf: properly initialize the turbo mode timestamp and rearm counter

2024-07-17 21:11:34 -07:00

watchdog.c

- The series "resource: A couple of cleanups" from Andy Shevchenko

2024-11-25 16:09:48 -08:00

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

workqueue: add printf attribute to __alloc_workqueue()

2024-12-24 09:50:38 -10:00