iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
linux/kernel
History
Barry Song 2917406c35 sched/fair: Document the slow path and fast path in select_task_rq_fair 
All People I know including myself took a long time to figure out that
typical wakeup will always go to fast path and never go to slow path
except WF_FORK and WF_EXEC.

Vincent reminded me once in a linaro meeting and made me understand
slow path won't happen for WF_TTWU. But my other friends repeatedly
wasted a lot of time on testing this path like me before I reminded
them.

So obviously the code needs some document.

Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20211016111109.5559-1-21cnbao@gmail.com
2021-12-07 15:14:10 +01:00
..
bpf
Networking fixes for 5.16-rc1, including fixes from bpf, can
2021-11-11 09:49:36 -08:00
cgroup
Merge branch 'akpm' (patches from Andrew)
2021-11-06 14:08:17 -07:00
configs
drivers/char: remove /dev/kmem for good
2021-05-07 00:26:34 -07:00
debug
kdb: Adopt scheduler's task classification
2021-11-03 17:21:37 +00:00
dma
dma-mapping updates for Linux 5.16
2021-11-09 10:56:41 -08:00
entry
Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2021-11-10 16:15:54 -08:00
events
perf/core: Avoid put_page() when GUP fails
2021-11-11 13:09:34 +01:00
futex
futex: Fix PREEMPT_RT build
2021-10-19 17:27:05 +02:00
gcov
Kconfig: Introduce ARCH_WANTS_NO_INSTR and CC_HAS_NO_PROFILE_FN_ATTR
2021-06-22 11:07:18 -07:00
irq
PCI/MSI: Move non-mask check back into low level accessors
2021-11-11 09:50:30 +01:00
kcsan
kcsan: selftest: Cleanup and add missing __init
2021-09-13 16:41:20 -07:00
livepatch
Tracing updates for 5.16:
2021-11-01 20:05:19 -07:00
locking
Merge branch 'akpm' (patches from Andrew)
2021-11-09 10:11:53 -08:00
power
Power management updates for 5.16-rc1
2021-11-02 16:04:28 -07:00
printk
Merge branch 'akpm' (patches from Andrew)
2021-11-06 14:08:17 -07:00
rcu
RCU pull request for v5.16
2021-11-01 20:25:38 -07:00
sched
sched/fair: Document the slow path and fast path in select_task_rq_fair
2021-12-07 15:14:10 +01:00
time
posix-cpu-timers: Clear task::posix_cputimers_work in copy_process()
2021-11-02 12:52:17 +01:00
trace
Three tracing fixes:
2021-11-13 10:11:51 -08:00
.gitignore
.gitignore: prefix local generated files with a slash
2021-05-02 00:43:35 +09:00
acct.c
kernel: remove spurious blkdev.h includes
2021-10-18 06:17:01 -06:00
async.c
kernel/async.c: remove async_unregister_domain()
2021-05-07 00:26:33 -07:00
audit_fsnotify.c
fsnotify: clarify contract for create event hooks
2021-10-27 12:32:34 +02:00
audit_tree.c
audit/stable-5.16 PR 20211101
2021-11-01 21:17:39 -07:00
audit_watch.c
\n
2021-11-06 16:43:20 -07:00
audit.c
lsm: separate security_task_getsecid() into subjective and objective variants
2021-03-22 15:23:32 -04:00
audit.h
audit/stable-5.16 PR 20211101
2021-11-01 21:17:39 -07:00
auditfilter.c
audit: add filtering for io_uring records
2021-09-19 22:34:38 -04:00
auditsc.c
audit/stable-5.16 PR 20211101
2021-11-01 21:17:39 -07:00
backtracetest.c
…
bounds.c
…
capability.c
capability: handle idmapped mounts
2021-01-24 14:27:16 +01:00
cfi.c
cfi: Use rcu_read_{un}lock_sched_notrace
2021-08-11 13:11:12 -07:00
compat.c
arch: remove compat_alloc_user_space
2021-09-08 15:32:35 -07:00
configs.c
…
context_tracking.c
…
cpu_pm.c
PM: cpu: Make notifier chain use a raw_spinlock_t
2021-08-16 18:55:32 +02:00
cpu.c
cpu/hotplug: Add debug printks for hotplug callback failures
2021-08-10 18:31:32 +02:00
crash_core.c
kdump: use vmlinux_build_id to simplify
2021-07-08 11:48:22 -07:00
crash_dump.c
…
cred.c
ucounts: In set_cred_ucounts assume new->ucounts is non-NULL
2021-10-20 10:45:34 -05:00
delayacct.c
delayacct: Add sysctl to enable at runtime
2021-05-12 11:43:25 +02:00
dma.c
…
exec_domain.c
…
exit.c
Merge branch 'per_signal_struct_coredumps-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2021-11-03 12:15:29 -07:00
extable.c
extable: use is_kernel_text() helper
2021-11-09 10:02:51 -08:00
fail_function.c
…
fork.c
A single fix for POSIX CPU timers to address a problem where POSIX CPU
2021-11-14 10:43:38 -08:00
freezer.c
sched: Add get_current_state()
2021-06-18 11:43:08 +02:00
gen_kheaders.sh
kbuild: clean up ${quiet} checks in shell scripts
2021-05-27 04:01:50 +09:00
groups.c
groups: simplify struct group_info allocation
2021-02-26 09:41:03 -08:00
hung_task.c
Merge branch 'akpm' (patches from Andrew)
2021-07-02 12:08:10 -07:00
iomem.c
…
irq_work.c
irq_work: Also rcuwait for !IRQ_WORK_HARD_IRQ on PREEMPT_RT
2021-10-15 11:25:18 +02:00
jump_label.c
jump_label: Fix jump_label_text_reserved() vs __init
2021-07-05 10:46:20 +02:00
kallsyms.c
kallsyms: strip LTO suffixes from static functions
2021-10-04 10:58:25 -07:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
locking/rwlock: Provide RT variant
2021-08-17 17:50:51 +02:00
Kconfig.preempt
preempt: Restore preemption model selection configs
2021-11-11 13:09:33 +01:00
kcov.c
kcov: replace local_irq_save() with a local_lock_t
2021-11-09 10:02:52 -08:00
kexec_core.c
Merge branch 'rework/printk_safe-removal' into for-linus
2021-08-30 16:36:10 +02:00
kexec_elf.c
…
kexec_file.c
memblock: add MEMBLOCK_DRIVER_MANAGED to mimic IORESOURCE_SYSRAM_DRIVER_MANAGED
2021-11-06 13:30:42 -07:00
kexec_internal.h
kexec: move machine_kexec_post_load() to public interface
2021-02-22 12:33:26 +00:00
kexec.c
kexec: avoid compat_alloc_user_space
2021-09-08 15:32:34 -07:00
kheaders.c
…
kmod.c
modules: add CONFIG_MODPROBE_PATH
2021-05-07 00:26:33 -07:00
kprobes.c
Tracing updates for 5.16:
2021-11-01 20:05:19 -07:00
ksysfs.c
…
kthread.c
Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2021-11-10 16:15:54 -08:00
latencytop.c
…
Makefile
Tracing updates for 5.16:
2021-11-01 20:05:19 -07:00
module_signature.c
module: harden ELF info handling
2021-01-19 10:24:45 +01:00
module_signing.c
module: harden ELF info handling
2021-01-19 10:24:45 +01:00
module-internal.h
…
module.c
module: change to print useful messages from elf_validity_check()
2021-11-05 15:13:10 -07:00
notifier.c
notifier: Remove atomic_notifier_call_chain_robust()
2021-08-16 18:55:32 +02:00
nsproxy.c
memcg: enable accounting for new namesapces and struct nsproxy
2021-09-03 09:58:12 -07:00
padata.c
padata: Remove repeated verbose license text
2021-08-27 16:30:18 +08:00
panic.c
Merge branch 'rework/printk_safe-removal' into for-linus
2021-08-30 16:36:10 +02:00
params.c
params: lift param_set_uint_minmax to common code
2021-08-16 14:42:22 +02:00
pid_namespace.c
memcg: enable accounting for new namesapces and struct nsproxy
2021-09-03 09:58:12 -07:00
pid.c
pid: add pidfd_get_task() helper
2021-10-14 13:29:18 +02:00
profile.c
profiling: fix shift-out-of-bounds bugs
2021-09-08 11:50:26 -07:00
ptrace.c
sched: Change task_struct::state
2021-06-18 11:43:09 +02:00
range.c
…
reboot.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2021-11-12 11:53:16 -08:00
regset.c
…
relay.c
…
resource_kunit.c
…
resource.c
kernel/resource: disallow access to exclusive system RAM regions
2021-11-09 10:02:52 -08:00
rseq.c
KVM: rseq: Update rseq when processing NOTIFY_RESUME on xfer to KVM guest
2021-09-22 10:24:01 -04:00
scftorture.c
scftorture: Warn on individual scf_torture_init() error conditions
2021-09-16 10:27:48 -07:00
scs.c
scs: Release kasan vmalloc poison in scs_free process
2021-09-30 09:37:27 +01:00
seccomp.c
Merge branch 'exit-cleanups-for-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2021-09-01 14:52:05 -07:00
signal.c
Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2021-11-10 16:15:54 -08:00
smp.c
sched: Improve wake_up_all_idle_cpus() take #2
2021-10-22 15:32:46 +02:00
smpboot.c
smpboot: Replace deprecated CPU-hotplug functions.
2021-08-10 14:57:42 +02:00
smpboot.h
…
softirq.c
genirq: Change force_irqthreads to a static key
2021-08-10 22:50:07 +02:00
stackleak.c
…
stacktrace.c
stacktrace: move filter_irq_stacks() to kernel/stacktrace.c
2021-11-06 13:30:43 -07:00
static_call.c
static_call: Fix static_call_text_reserved() vs __init
2021-07-05 10:46:33 +02:00
stop_machine.c
stop_machine: Add caller debug info to queue_stop_cpus_work
2021-03-23 16:01:58 +01:00
sys_ni.c
futex: Implement sys_futex_waitv()
2021-10-07 13:51:11 +02:00
sys.c
Merge branch 'akpm' (patches from Andrew)
2021-09-08 12:55:35 -07:00
sysctl-test.c
kernel/sysctl-test: Remove some casts which are no-longer required
2021-06-23 16:41:24 -06:00
sysctl.c
Merge branch 'akpm' (patches from Andrew)
2021-09-03 10:08:28 -07:00
task_work.c
kasan: record task_work_add() call stack
2021-04-30 11:20:42 -07:00
taskstats.c
…
torture.c
torture: Replace deprecated CPU-hotplug functions.
2021-08-10 10:48:07 -07:00
tracepoint.c
tracepoint: Fix kerneldoc comments
2021-08-16 11:39:51 -04:00
tsacct.c
mm/mmap.c: fix a data race of mm->total_vm
2021-11-06 13:30:35 -07:00
ucount.c
ucounts: Use atomic_long_sub_return for clarity
2021-10-20 10:45:34 -05:00
uid16.c
…
uid16.h
…
umh.c
kernel/umh.c: fix some spelling mistakes
2021-05-07 00:26:34 -07:00
up.c
A set of locking related fixes and updates:
2021-05-09 13:07:03 -07:00
user_namespace.c
memcg: enable accounting for new namesapces and struct nsproxy
2021-09-03 09:58:12 -07:00
user-return-notifier.c
…
user.c
fs/epoll: use a per-cpu counter for user's watches count
2021-09-08 11:50:27 -07:00
usermode_driver.c
Merge branch 'work.namei' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2021-07-03 11:41:14 -07:00
utsname_sysctl.c
…
utsname.c
…
watch_queue.c
watch_queue: rectify kernel-doc for init_watch()
2021-01-26 11:16:34 +00:00
watchdog_hld.c
…
watchdog.c
kernel: watchdog: modify the explanation related to watchdog thread
2021-06-29 10:53:46 -07:00
workqueue_internal.h
workqueue: Assign a color to barrier work items
2021-08-17 07:49:10 -10:00
workqueue.c
Merge branch 'akpm' (patches from Andrew)
2021-11-06 14:08:17 -07:00