iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
linux/kernel
History
Peter Zijlstra b168098912 perf: Optimize perf_pmu_migrate_context() 
Thomas reported that offlining CPUs spends a lot of time in
synchronize_rcu() as called from perf_pmu_migrate_context() even though
he's not actually using uncore events.

Turns out, the thing is unconditionally waiting for RCU, even if there's
no actual events to migrate.

Fixes: 0cda4c023132 ("perf: Introduce perf_pmu_migrate_context()")
Reported-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Link: https://lkml.kernel.org/r/20230403090858.GT4253@hirez.programming.kicks-ass.net
2023-04-05 09:58:46 +02:00
..
bpf
bpf: Adjust insufficient default bpf_jit_limit
2023-03-21 12:43:05 -07:00
cgroup
Networking changes for 6.3.
2023-02-21 18:24:12 -08:00
configs
mm, slob: rename CONFIG_SLOB to CONFIG_SLOB_DEPRECATED
2022-12-01 00:09:20 +01:00
debug
kdb: use srcu console list iterator
2022-12-02 11:25:00 +01:00
dma
swiotlb: mark swiotlb_memblock_alloc() as __init
2023-02-22 06:44:48 -08:00
entry
entry/rcu: Check TIF_RESCHED _after_ delayed RCU wake-up
2023-03-21 15:13:15 +01:00
events
perf: Optimize perf_pmu_migrate_context()
2023-04-05 09:58:46 +02:00
futex
- Prevent the leaking of a debug timer in futex_waitv()
2023-01-01 11:15:05 -08:00
gcov
gcov: add support for checksum field
2022-12-21 14:31:52 -08:00
irq
A set of updates for the interrupt susbsystem:
2023-03-05 11:19:16 -08:00
kcsan
kcsan: avoid passing -g for test
2023-03-23 17:18:35 -07:00
livepatch
Livepatching changes for 6.3
2023-02-23 14:00:10 -08:00
locking
RCU pull request for v6.3
2023-02-21 10:45:51 -08:00
module
modules-6.3-rc1
2023-02-23 14:05:08 -08:00
power
Merge branches 'powercap', 'pm-domains', 'pm-em' and 'pm-opp'
2023-02-15 20:06:26 +01:00
printk
printk changes for 6.3
2023-02-23 13:49:45 -08:00
rcu
Merge branch 'stall.2023.01.09a' into HEAD
2023-02-02 16:40:07 -08:00
sched
sched/fair: Sanitize vruntime of entity being migrated
2023-03-21 14:43:04 +01:00
time
Updates for timekeeping, timers and clockevent/source drivers:
2023-02-21 09:45:13 -08:00
trace
Tracing fixes for 6.3:
2023-03-19 10:46:02 -07:00
.gitignore
…
acct.c
acct: fix potential integer overflow in encode_comp_t()
2022-11-30 16:13:18 -08:00
async.c
…
audit_fsnotify.c
audit: fix potential double free on error path from fsnotify_add_inode_mark
2022-08-22 18:50:06 -04:00
audit_tree.c
audit: use fsnotify group lock helpers
2022-04-25 14:37:28 +02:00
audit_watch.c
audit_init_parent(): constify path
2022-09-01 17:39:30 -04:00
audit.c
audit: use time_after to compare time
2022-08-29 19:47:03 -04:00
audit.h
audit: remove selinux_audit_rule_update() declaration
2022-09-07 11:30:15 -04:00
auditfilter.c
…
auditsc.c
capability: just use a 'u64' instead of a 'u32[2]' array
2023-03-01 10:01:22 -08:00
backtracetest.c
…
bounds.c
mm: multi-gen LRU: minimal implementation
2022-09-26 19:46:09 -07:00
capability.c
capability: just use a 'u64' instead of a 'u32[2]' array
2023-03-01 10:01:22 -08:00
cfi.c
cfi: Switch to -fsanitize=kcfi
2022-09-26 10:13:13 -07:00
compat.c
sched_getaffinity: don't assume 'cpumask_size()' is fully initialized
2023-03-14 19:32:38 -07:00
configs.c
…
context_tracking.c
context_tracking: Fix noinstr vs KASAN
2023-01-13 11:48:18 +01:00
cpu_pm.c
cpuidle, cpu_pm: Remove RCU fiddling from cpu_pm_{enter,exit}()
2023-01-13 11:48:15 +01:00
cpu.c
cpu/hotplug: Do not bail-out in DYING/STARTING sections
2022-12-02 12:43:02 +01:00
crash_core.c
mm: remove 'First tail page' members from struct page
2023-02-02 22:32:59 -08:00
crash_dump.c
…
cred.c
cred: Do not default to init_cred in prepare_kernel_cred()
2022-11-01 10:04:52 -07:00
delayacct.c
delayacct: support re-entrance detection of thrashing accounting
2022-09-26 19:46:07 -07:00
dma.c
…
exec_domain.c
…
exit.c
arm64 updates for 6.3:
2023-02-21 15:27:48 -08:00
extable.c
context_tracking: Take NMI eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
fail_function.c
kernel/fail_function: fix memory leak with using debugfs_lookup()
2023-02-08 13:36:22 +01:00
fork.c
Fixes for 6.3-rc3:
2023-03-25 12:57:34 -07:00
freezer.c
freezer,sched: Rewrite core freezer logic
2022-09-07 21:53:50 +02:00
gen_kheaders.sh
kheaders: use standard naming for the temporary directory
2023-01-22 23:43:34 +09:00
groups.c
security: Add LSM hook to setgroups() syscall
2022-07-15 18:21:49 +00:00
hung_task.c
hung_task: print message when hung_task_warnings gets down to zero.
2023-02-09 17:03:20 -08:00
iomem.c
…
irq_work.c
irq_work: use kasan_record_aux_stack_noalloc() record callstack
2022-04-15 14:49:55 -07:00
jump_label.c
jump_label: Prevent key->enabled int overflow
2022-12-01 15:53:05 -08:00
kallsyms_internal.h
kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[]
2022-11-12 18:47:36 -08:00
kallsyms_selftest.c
kallsyms: Fix scheduling with interrupts disabled in self-test
2023-01-13 15:09:08 -08:00
kallsyms_selftest.h
kallsyms: Add self-test facility
2022-11-15 00:42:02 -08:00
kallsyms.c
kallsyms: Add self-test facility
2022-11-15 00:42:02 -08:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
Revert "signal, x86: Delay calling signals in atomic on RT enabled kernels"
2022-03-31 10:36:55 +02:00
kcov.c
mm: replace vma->vm_flags direct modifications with modifier calls
2023-02-09 16:51:39 -08:00
kexec_core.c
There is no particular theme here - mainly quick hits all over the tree.
2023-02-23 17:55:40 -08:00
kexec_elf.c
…
kexec_file.c
kexec: introduce sysctl parameters kexec_load_limit_*
2023-02-02 22:50:05 -08:00
kexec_internal.h
panic, kexec: make __crash_kexec() NMI safe
2022-09-11 21:55:06 -07:00
kexec.c
kexec: introduce sysctl parameters kexec_load_limit_*
2023-02-02 22:50:05 -08:00
kheaders.c
…
kmod.c
…
kprobes.c
x86/kprobes: Fix arch_check_optimized_kprobe check within optimized_kprobe range
2023-02-21 08:49:16 +09:00
ksysfs.c
kernels/ksysfs.c: export kernel address bits
2023-01-20 14:30:45 +01:00
kthread.c
kthread_worker: check all delayed works when destroy kthread worker
2023-02-02 22:50:02 -08:00
latencytop.c
latencytop: use the last element of latency_record of system
2022-09-11 21:55:12 -07:00
Makefile
kernel hardening fixes for v6.2-rc1
2022-12-23 12:00:24 -08:00
module_signature.c
…
notifier.c
kernel/notifier: Remove CONFIG_SRCU
2023-02-02 16:26:06 -08:00
nsproxy.c
fs/exec: switch timens when a task gets a new mm
2022-10-25 15:15:52 -07:00
padata.c
Kbuild updates for v6.2
2022-12-19 12:33:32 -06:00
panic.c
panic: fix the panic_print NMI backtrace setting
2023-03-02 21:54:23 -08:00
params.c
kernel/params.c: Use kstrtobool() instead of strtobool()
2023-01-25 14:07:21 -08:00
pid_namespace.c
- Daniel Verkamp has contributed a memfd series ("mm/memfd: add
2023-02-23 17:09:35 -08:00
pid_sysctl.h
mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC
2023-01-18 17:12:37 -08:00
pid.c
gfs2: Add glockfd debugfs file
2022-06-29 13:07:16 +02:00
profile.c
kernel/profile.c: simplify duplicated code in profile_setup()
2022-09-11 21:55:12 -07:00
ptrace.c
rseq: Introduce extensible rseq ABI
2022-12-27 12:52:10 +01:00
range.c
…
reboot.c
kernel/reboot: Add SYS_OFF_MODE_RESTART_PREPARE mode
2022-10-04 15:59:36 +02:00
regset.c
…
relay.c
mm: replace vma->vm_flags direct modifications with modifier calls
2023-02-09 16:51:39 -08:00
resource_kunit.c
…
resource.c
dax/kmem: Fix leak of memory-hotplug resources
2023-02-17 14:58:01 -08:00
rseq.c
rseq: Extend struct rseq with per-memory-map concurrency ID
2022-12-27 12:52:12 +01:00
scftorture.c
scftorture: Fix distribution of short handler delays
2022-04-11 17:07:29 -07:00
scs.c
scs: add support for dynamic shadow call stacks
2022-11-09 18:06:35 +00:00
seccomp.c
seccomp: fix kernel-doc function name warning
2023-01-13 17:01:06 -08:00
signal.c
sched: Introduce per-memory-map concurrency ID
2022-12-27 12:52:11 +01:00
smp.c
bitmap patches for v6.1-rc1
2022-10-10 12:49:34 -07:00
smpboot.c
smpboot: use atomic_try_cmpxchg in cpu_wait_death and cpu_report_death
2022-09-11 21:55:10 -07:00
smpboot.h
…
softirq.c
context_tracking: Take IRQ eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
stackleak.c
stackleak: add on/off stack variants
2022-05-08 01:33:09 -07:00
stacktrace.c
…
static_call_inline.c
static_call: Add call depth tracking support
2022-10-17 16:41:16 +02:00
static_call.c
static_call: Don't make __static_call_return0 static
2022-04-05 09:59:38 +02:00
stop_machine.c
Scheduler changes in this cycle were:
2022-05-24 11:11:13 -07:00
sys_ni.c
kernel/sys_ni: add compat entry for fadvise64_64
2022-08-20 15:17:45 -07:00
sys.c
- Daniel Verkamp has contributed a memfd series ("mm/memfd: add
2023-02-23 17:09:35 -08:00
sysctl-test.c
kernel/sysctl-test: use SYSCTL_{ZERO/ONE_HUNDRED} instead of i_{zero/one_hundred}
2022-09-08 16:56:45 -07:00
sysctl.c
sysctl: fix proc_dobool() usability
2023-02-21 13:34:07 -08:00
task_work.c
task_work: use try_cmpxchg in task_work_add, task_work_cancel_match and task_work_run
2022-09-11 21:55:10 -07:00
taskstats.c
genetlink: start to validate reserved header bytes
2022-08-29 12:47:15 +01:00
torture.c
torture: Fix hang during kthread shutdown phase
2023-01-05 12:10:35 -08:00
tracepoint.c
tracepoint: Allow livepatch module add trace event
2023-02-18 14:34:36 -05:00
tsacct.c
taskstats: version 12 with thread group and exe info
2022-04-29 14:38:03 -07:00
ucount.c
ucounts: Split rlimit and ucount values and max values
2022-05-18 18:24:57 -05:00
uid16.c
…
uid16.h
…
umh.c
umh: simplify the capability pointer logic
2023-03-03 16:18:19 -08:00
up.c
…
user_namespace.c
userns: fix a struct's kernel-doc notation
2023-02-02 22:50:04 -08:00
user-return-notifier.c
…
user.c
kernel/user: Allow user_struct::locked_vm to be usable for iommufd
2022-11-30 20:16:49 -04:00
usermode_driver.c
blob_to_mnt(): kern_unmount() is needed to undo kern_mount()
2022-05-19 23:25:47 -04:00
utsname_sysctl.c
kernel/utsname_sysctl.c: Fix hostname polling
2022-10-23 12:01:01 -07:00
utsname.c
…
watch_queue.c
watch_queue: fix IOC_WATCH_QUEUE_SET_SIZE alloc error paths
2023-03-08 11:44:45 +01:00
watchdog_hld.c
Revert "printk: add functions to prefer direct printing"
2022-06-23 18:41:40 +02:00
watchdog.c
powerpc updates for 6.0
2022-08-06 16:38:17 -07:00
workqueue_internal.h
…
workqueue.c
workqueue: Fold rebind_worker() within rebind_workers()
2023-01-13 07:50:40 -10:00