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d6b6d39054
linux/kernel
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Linus Torvalds d6b6d39054 workqueue: Changes for v6.13 
- Maximum concurrency limit of 512 which was set a long time ago is too low
   now. A legitimate use (BPF cgroup release) of system_wq could saturate it
   under stress test conditions leading to false dependencies and deadlocks.
   While the offending use was switched to a dedicated workqueue, use the
   opportunity to bump WQ_MAX_ACTIVE four fold and document that system
   workqueue shouldn't be saturated. Workqueue should add at least a warning
   mechanism for cases where system workqueues are saturated.
 
 - Recent workqueue updates to support more flexible execution topology made
   unbound workqueues use per-cpu worker pool frontends which pushed up
   workqueue flush overhead. As consecutive CPUs are likely to be pointing to
   the same worker pool, reduce overhead by switching locks only when
   necessary.
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Merge tag 'wq-for-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

Pull workqueue updates from Tejun Heo:

 - The maximum concurrency limit of 512 which was set a long time ago is
   too low now.

   A legitimate use (BPF cgroup release) of system_wq could saturate it
   under stress test conditions leading to false dependencies and
   deadlocks.

   While the offending use was switched to a dedicated workqueue, use
   the opportunity to bump WQ_MAX_ACTIVE four fold and document that
   system workqueue shouldn't be saturated. Workqueue should add at
   least a warning mechanism for cases where system workqueues are
   saturated.

 - Recent workqueue updates to support more flexible execution topology
   made unbound workqueues use per-cpu worker pool frontends which
   pushed up workqueue flush overhead.

   As consecutive CPUs are likely to be pointing to the same worker
   pool, reduce overhead by switching locks only when necessary.

* tag 'wq-for-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  workqueue: Reduce expensive locks for unbound workqueue
  workqueue: Adjust WQ_MAX_ACTIVE from 512 to 2048
  workqueue: doc: Add a note saturating the system_wq is not permitted
2024-11-20 09:41:11 -08:00
..
bpf Random number generator updates for Linux 6.13-rc1. 2024-11-19 10:43:44 -08:00
cgroup the bulk of struct fd memory safety stuff 2024-11-18 12:24:06 -08:00
configs tinyconfig: remove unnecessary 'is not set' for choice blocks 2024-09-01 20:34:38 +09:00
debug move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
dma dma-mapping: report unlimited DMA addressing in IOMMU DMA path 2024-09-23 08:38:56 +02:00
entry sched: Add TIF_NEED_RESCHED_LAZY infrastructure 2024-11-05 12:55:37 +01:00
events Performance events changes for v6.13: 2024-11-19 13:34:06 -08:00
futex A rather large update for timekeeping and timers: 2024-11-19 16:35:06 -08:00
gcov gcov: add support for GCC 14 2024-06-15 10:43:06 -07:00
irq A set of updates for the interrupt subsystem: 2024-11-19 15:54:19 -08:00
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 Scheduler changes for v6.13: 2024-11-19 14:16:06 -08:00
module the bulk of struct fd memory safety stuff 2024-11-18 12:24:06 -08:00
power PM: EM: Add min/max available performance state limits 2024-11-04 23:00:47 +01:00
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 A rather large update for timekeeping and timers: 2024-11-19 16:35:06 -08:00
time A rather large update for timekeeping and timers: 2024-11-19 16:35:06 -08:00
trace Performance events changes for v6.13: 2024-11-19 13:34:06 -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 lsm/stable-6.13 PR 20241112 2024-11-18 17:34:05 -08:00
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 A rather large update for timekeeping and timers: 2024-11-19 16:35:06 -08:00
crash_core.c Document/kexec: generalize crash hotplug description 2024-09-01 20:43:37 -07:00
crash_reserve.c crash: fix crash memory reserve exceed system memory bug 2024-09-01 20:43:30 -07:00
cred.c cred: Use KMEM_CACHE() instead of kmem_cache_create() 2024-02-23 17:33:31 -05:00
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 A rather large update for timekeeping and timers: 2024-11-19 16:35:06 -08:00
freezer.c sched/fair: Fix external p->on_rq users 2024-10-14 09:14:35 +02:00
gen_kheaders.sh kheaders: use command -v to test for existence of cpio 2024-05-30 01:13:20 +09:00
groups.c groups: Convert group_info.usage to refcount_t 2023-09-29 11:28:39 -07:00
hung_task.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
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 Updates for KCOV instrumentation on x86: 2024-09-17 12:40:34 +02:00
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 kallsyms: make kallsyms_show_value() as generic function 2023-06-08 12:27:20 -07:00
ksysfs.c profiling: remove prof_cpu_mask 2024-07-29 10:45:54 -07:00
kthread.c kthread: unpark only parked kthread 2024-10-09 12:47:19 -07:00
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
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 misc: Remove the now superfluous sentinel elements from ctl_table array 2024-04-24 09:43:53 +02:00
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 resource,kexec: walk_system_ram_res_rev must retain resource flags 2024-10-28 21:40:40 -07:00
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 A rather large update for timekeeping and timers: 2024-11-19 16:35:06 -08:00
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 A set of updates for the interrupt subsystem: 2024-11-19 15:54:19 -08:00
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 static_call: Replace pointless WARN_ON() in static_call_module_notify() 2024-09-06 16:29:22 +02:00
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: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +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 tracepoint: Support iterating tracepoints in a loading module 2024-09-25 23:23:44 +09:00
tsacct.c tsacct: replace strncpy() with strscpy() 2024-07-12 16:39:53 -07:00
ucount.c signal: restore the override_rlimit logic 2024-11-07 14:14:59 -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/hardlockup: move SMP barriers from common code to buddy code 2023-06-19 16:25:28 -07:00
watchdog_perf.c watchdog/perf: properly initialize the turbo mode timestamp and rearm counter 2024-07-17 21:11:34 -07:00
watchdog.c watchdog: handle the ENODEV failure case of lockup_detector_delay_init() separately 2024-09-01 20:43:32 -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 workqueue: Reduce expensive locks for unbound workqueue 2024-11-15 06:43:39 -10:00