Viresh Kumar 9f6d9baaa8 timer: Kick dynticks targets on mod_timer*() calls ... When a timer is enqueued or modified on a dynticks target, that CPU must re-evaluate the next tick to service that timer. The tick re-evaluation is performed by an IPI kick on the target. Now while we correctly call wake_up_nohz_cpu() from add_timer_on(), the mod_timer*() API family doesn't support so well dynticks targets. The reason for this is likely that __mod_timer() isn't supposed to select an idle target for a timer, unless that target is the current CPU, in which case a dynticks idle kick isn't actually needed. But there is a small race window lurking behind that assumption: the elected target has all the time to turn dynticks idle between the call to get_nohz_timer_target() and the locking of its base. Hence a risk that we enqueue a timer on a dynticks idle destination without kicking it. As a result, the timer might be serviced too late in the future. Also a target elected by __mod_timer() can be in full dynticks mode and thus require to be kicked as well. And unlike idle dynticks, this concern both local and remote targets. To fix this whole issue, lets centralize the dynticks kick to internal_add_timer() so that it is well handled for all sort of timer enqueue. Even timer migration is concerned so that a full dynticks target is correctly kicked as needed when timers are migrating to it. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/1403393357-2070-3-git-send-email-fweisbec@gmail.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2014-06-23 11:23:47 +02:00
..
debug	kdb: Use ktime_get_ts()	2014-06-12 16:18:45 +02:00
events	Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into next	2014-06-05 15:57:04 -07:00
gcov	gcov: reuse kbasename helper	2013-11-13 12:09:34 +09:00
irq	genirq: Improve documentation to match current implementation	2014-05-27 10:16:44 +02:00
locking	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next	2014-06-03 14:00:15 -07:00
power	Merge branches 'pnp', 'powercap', 'pm-runtime' and 'pm-opp'	2014-06-03 23:13:00 +02:00
printk	kernel/printk: use symbolic defines for console loglevels	2014-06-04 16:54:17 -07:00
rcu	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next	2014-06-03 12:57:53 -07:00
sched	numa,sched: fix load_to_imbalanced logic inversion	2014-06-08 14:35:05 -07:00
time	timer: Kick dynticks targets on mod_timer*() calls	2014-06-23 11:23:47 +02:00
trace	tracing: Use rcu_dereference_sched() for trace event triggers	2014-05-02 23:12:42 -04:00
.gitignore	Ignore generated file kernel/x509_certificate_list	2013-12-10 18:21:34 +00:00
acct.c	acct: Use ktime_get_ts()	2014-06-12 16:18:44 +02:00
async.c
audit_tree.c	inotify: Fix reporting of cookies for inotify events	2014-02-18 11:17:17 +01:00
audit_watch.c	inotify: Fix reporting of cookies for inotify events	2014-02-18 11:17:17 +01:00
audit.c	ipc, kernel: use Linux headers	2014-06-06 16:08:14 -07:00
audit.h	audit: Use struct net not pid_t to remember the network namespce to reply in	2014-03-20 10:10:53 -04:00
auditfilter.c	Merge git://git.infradead.org/users/eparis/audit	2014-04-12 12:38:53 -07:00
auditsc.c	Merge git://git.infradead.org/users/eparis/audit	2014-04-12 12:38:53 -07:00
backtracetest.c	kernel/backtracetest.c: replace no level printk by pr_info()	2014-06-04 16:54:14 -07:00
bounds.c	mm: do not allocate page->ptl dynamically, if spinlock_t fits to long	2013-12-20 12:25:45 -08:00
capability.c	kernel/capability.c: code clean-up	2014-06-04 16:54:15 -07:00
cgroup_freezer.c	cgroup: fix rcu_read_lock() leak in update_if_frozen()	2014-05-13 11:28:30 -04:00
cgroup.c	kernfs: move the last knowledge of sysfs out from kernfs	2014-06-03 08:11:18 -07:00
compat.c	kernel/compat.c: use sizeof() instead of sizeof	2014-06-04 16:54:19 -07:00
configs.c
context_tracking.c	asmlinkage: Add explicit __visible to drivers/*, lib/*, kernel/*	2014-05-05 16:07:46 -07:00
cpu_pm.c
cpu.c	kernel/cpu.c: convert printk to pr_foo()	2014-06-04 16:54:14 -07:00
cpuset.c	mm: page_alloc: use jump labels to avoid checking number_of_cpusets	2014-06-04 16:54:08 -07:00
crash_dump.c
cred.c
delayacct.c	delayacct: Use ktime_get_ts()	2014-06-12 16:18:45 +02:00
dma.c
elfcore.c	switch elf_core_write_extra_phdrs() to dump_emit()	2013-11-09 00:16:23 -05:00
exec_domain.c	kernel/exec_domain.c: code clean-up	2014-06-04 16:54:15 -07:00
exit.c	signals: mv {dis,}allow_signal() from sched.h/exit.c to signal.[ch]	2014-06-06 16:08:11 -07:00
extable.c	asmlinkage: Make main_extable_sort_needed visible	2014-02-13 18:13:22 -08:00
fork.c	fork: Use ktime_get_ts()	2014-06-12 16:18:45 +02:00
freezer.c	libata, freezer: avoid block device removal while system is frozen	2013-12-19 13:50:32 -05:00
futex_compat.c	compat: Get rid of (get|put)_compat_time(val|spec)	2014-02-02 14:09:12 -08:00
futex.c	Merge branch 'next' (accumulated 3.16 merge window patches) into master	2014-06-08 11:31:16 -07:00
groups.c	kernel/groups.c: remove return value of set_groups	2014-04-03 16:21:05 -07:00
hung_task.c	kernel/hung_task.c: convert simple_strtoul to kstrtouint	2014-06-04 16:54:15 -07:00
irq_work.c	perf/x86: Warn to early_printk() in case irq_work is too slow	2014-02-21 21:49:07 +01:00
jump_label.c	static_key: WARN on usage before jump_label_init was called	2013-10-19 19:45:35 -04:00
kallsyms.c	kernel: use macros from compiler.h instead of __attribute__((...))	2014-04-07 16:36:11 -07:00
kcmp.c
Kconfig.freezer
Kconfig.hz	kernel: remove CONFIG_USE_GENERIC_SMP_HELPERS	2013-11-15 09:32:22 +09:00
Kconfig.locks
Kconfig.preempt
kexec.c	kernel/kexec.c: convert printk to pr_foo()	2014-06-06 16:08:12 -07:00
kmod.c	signals: change wait_for_helper() to use kernel_sigaction()	2014-06-06 16:08:12 -07:00
kprobes.c	kprobes: use KSYM_NAME_LEN to size identifier buffers	2013-11-13 12:09:26 +09:00
ksysfs.c	kobject: Make support for uevent_helper optional.	2014-04-25 12:00:49 -07:00
kthread.c	kthread: fix return value of kthread_create() upon SIGKILL.	2014-06-04 16:53:51 -07:00
latencytop.c	kernel/latencytop.c: convert seq_printf to seq_puts	2014-06-04 16:54:15 -07:00
Makefile	time/timers: Move all time(r) related files into kernel/time	2014-06-23 11:22:35 +02:00
module_signing.c	keys: change asymmetric keys to use common hash definitions	2013-10-25 17:15:18 -04:00
module-internal.h	KEYS: Separate the kernel signature checking keyring from module signing	2013-09-25 17:17:01 +01:00
module.c	Fixed one missing place for the new taint flag, and remove a warning	2014-05-01 10:35:01 -07:00
notifier.c	notifier: Substitute rcu_access_pointer() for rcu_dereference_raw()	2014-02-26 06:35:13 -08:00
nsproxy.c
padata.c	padata: Fix wrong usage of rcu_dereference()	2013-12-05 21:28:42 +08:00
panic.c	kernel/panic.c: add "crash_kexec_post_notifiers" option for kdump after panic_notifers	2014-06-06 16:08:12 -07:00
params.c	params: improve standard definitions	2013-12-04 14:09:46 +10:30
pid_namespace.c	pid_namespace: pidns_get() should check task_active_pid_ns() != NULL	2014-04-02 16:20:21 -07:00
pid.c	pidns: fix free_pid() to handle the first fork failure	2013-09-30 14:31:03 -07:00
profile.c	kernel/profile.c: use static const char instead of static char	2014-06-06 16:08:13 -07:00
ptrace.c	kernel/compat: convert to COMPAT_SYSCALL_DEFINE	2014-03-06 15:35:10 +01:00
range.c
reboot.c	kernel/reboot.c: convert simple_strtoul to kstrtoint	2014-06-04 16:54:15 -07:00
relay.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-04-12 14:49:50 -07:00
res_counter.c	kernel/res_counter.c: replace simple_strtoull by kstrtoull	2014-06-04 16:54:15 -07:00
resource.c	resources: Clarify sanity check message	2014-05-23 10:47:21 -06:00
seccomp.c	kernel/seccomp.c: kernel-doc warning fix	2014-06-06 16:08:15 -07:00
signal.c	signals: introduce kernel_sigaction()	2014-06-06 16:08:12 -07:00
smp.c	smp: print more useful debug info upon receiving IPI on an offline CPU	2014-06-06 16:08:12 -07:00
smpboot.c
smpboot.h
softirq.c	Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu	2014-05-22 11:36:10 +02:00
stacktrace.c
stop_machine.c	kernel/stop_machine.c: kernel-doc warning fix	2014-06-04 16:54:15 -07:00
sys_ni.c	sys_sgetmask/sys_ssetmask: add CONFIG_SGETMASK_SYSCALL	2014-06-04 16:54:14 -07:00
sys.c	sched: Consolidate open coded implementations of nice level frobbing into nice_to_rlimit() and rlimit_to_nice()	2014-05-22 11:16:36 +02:00
sysctl_binary.c	kernel/sysctl_binary.c: use scnprintf() instead of snprintf()	2013-11-13 12:09:33 +09:00
sysctl.c	sysctl: convert use of typedef ctl_table to struct ctl_table	2014-06-06 16:08:16 -07:00
system_certificates.S	KEYS: correct alignment of system_certificate_list content in assembly file	2013-12-10 18:25:28 +00:00
system_keyring.c	KEYS: correct alignment of system_certificate_list content in assembly file	2013-12-10 18:25:28 +00:00
task_work.c	task_work: documentation	2013-09-11 15:58:27 -07:00
taskstats.c	genetlink: only pass array to genl_register_family_with_ops()	2013-11-19 16:39:05 -05:00
test_kprobes.c
torture.c	torture: Remove __init from torture_init_begin/end	2014-05-14 09:46:30 -07:00
tracepoint.c	kernel/tracepoint.c: kernel-doc fixes	2014-06-04 16:54:15 -07:00
tsacct.c	tsacct: Use ktime_get_ts()	2014-06-12 16:18:45 +02:00
uid16.c
up.c	smp: Rename __smp_call_function_single() to smp_call_function_single_async()	2014-02-24 14:47:15 -08:00
user_namespace.c	kernel/user_namespace.c: kernel-doc/checkpatch fixes	2014-06-06 16:08:13 -07:00
user-return-notifier.c
user.c	kernel/user.c: drop unused field 'files' from user_struct	2014-06-04 16:54:16 -07:00
utsname_sysctl.c	sysctl: convert use of typedef ctl_table to struct ctl_table	2014-06-06 16:08:16 -07:00
utsname.c
watchdog.c	kernel/watchdog.c:touch_softlockup_watchdog(): use raw_cpu_write()	2014-04-18 16:40:08 -07:00
workqueue_internal.h
workqueue.c	Linux 3.15-rc6	2014-05-22 10:28:56 +02:00