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
kdb: Use ktime_get_ts()
2014-06-12 16:18:45 +02:00
Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into next
2014-06-05 15:57:04 -07:00
genirq: Improve documentation to match current implementation
2014-05-27 10:16:44 +02:00
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
Merge branches 'pnp', 'powercap', 'pm-runtime' and 'pm-opp'
2014-06-03 23:13:00 +02:00
kernel/printk: use symbolic defines for console loglevels
2014-06-04 16:54:17 -07:00
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
numa,sched: fix load_to_imbalanced logic inversion
2014-06-08 14:35:05 -07:00
timer: Kick dynticks targets on mod_timer*() calls
2014-06-23 11:23:47 +02:00
tracing: Use rcu_dereference_sched() for trace event triggers
2014-05-02 23:12:42 -04:00
acct: Use ktime_get_ts()
2014-06-12 16:18:44 +02:00
ipc, kernel: use Linux headers
2014-06-06 16:08:14 -07:00
audit: Use struct net not pid_t to remember the network namespce to reply in
2014-03-20 10:10:53 -04:00
inotify: Fix reporting of cookies for inotify events
2014-02-18 11:17:17 +01:00
inotify: Fix reporting of cookies for inotify events
2014-02-18 11:17:17 +01:00
Merge git://git.infradead.org/users/eparis/audit
2014-04-12 12:38:53 -07:00
Merge git://git.infradead.org/users/eparis/audit
2014-04-12 12:38:53 -07:00
kernel/backtracetest.c: replace no level printk by pr_info()
2014-06-04 16:54:14 -07:00
kernel/capability.c: code clean-up
2014-06-04 16:54:15 -07:00
kernfs: move the last knowledge of sysfs out from kernfs
2014-06-03 08:11:18 -07:00
cgroup: fix rcu_read_lock() leak in update_if_frozen()
2014-05-13 11:28:30 -04:00
kernel/compat.c: use sizeof() instead of sizeof
2014-06-04 16:54:19 -07:00
asmlinkage: Add explicit __visible to drivers/*, lib/*, kernel/*
2014-05-05 16:07:46 -07:00
kernel/cpu.c: convert printk to pr_foo()
2014-06-04 16:54:14 -07:00
mm: page_alloc: use jump labels to avoid checking number_of_cpusets
2014-06-04 16:54:08 -07:00
delayacct: Use ktime_get_ts()
2014-06-12 16:18:45 +02:00
kernel/exec_domain.c: code clean-up
2014-06-04 16:54:15 -07:00
signals: mv {dis,}allow_signal() from sched.h/exit.c to signal.[ch]
2014-06-06 16:08:11 -07:00
asmlinkage: Make main_extable_sort_needed visible
2014-02-13 18:13:22 -08:00
fork: Use ktime_get_ts()
2014-06-12 16:18:45 +02:00
Merge branch 'next' (accumulated 3.16 merge window patches) into master
2014-06-08 11:31:16 -07:00
compat: Get rid of (get|put)_compat_time(val|spec)
2014-02-02 14:09:12 -08:00
kernel/groups.c: remove return value of set_groups
2014-04-03 16:21:05 -07:00
kernel/hung_task.c: convert simple_strtoul to kstrtouint
2014-06-04 16:54:15 -07:00
perf/x86: Warn to early_printk() in case irq_work is too slow
2014-02-21 21:49:07 +01:00
kernel: use macros from compiler.h instead of __attribute__((...))
2014-04-07 16:36:11 -07:00
kernel/kexec.c: convert printk to pr_foo()
2014-06-06 16:08:12 -07:00
signals: change wait_for_helper() to use kernel_sigaction()
2014-06-06 16:08:12 -07:00
kobject: Make support for uevent_helper optional.
2014-04-25 12:00:49 -07:00
kthread: fix return value of kthread_create() upon SIGKILL.
2014-06-04 16:53:51 -07:00
kernel/latencytop.c: convert seq_printf to seq_puts
2014-06-04 16:54:15 -07:00
time/timers: Move all time(r) related files into kernel/time
2014-06-23 11:22:35 +02:00
Fixed one missing place for the new taint flag, and remove a warning
2014-05-01 10:35:01 -07:00
notifier: Substitute rcu_access_pointer() for rcu_dereference_raw()
2014-02-26 06:35:13 -08:00
kernel/panic.c: add "crash_kexec_post_notifiers" option for kdump after panic_notifers
2014-06-06 16:08:12 -07:00
pid_namespace: pidns_get() should check task_active_pid_ns() != NULL
2014-04-02 16:20:21 -07:00
kernel/profile.c: use static const char instead of static char
2014-06-06 16:08:13 -07:00
kernel/compat: convert to COMPAT_SYSCALL_DEFINE
2014-03-06 15:35:10 +01:00
kernel/reboot.c: convert simple_strtoul to kstrtoint
2014-06-04 16:54:15 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2014-04-12 14:49:50 -07:00
kernel/res_counter.c: replace simple_strtoull by kstrtoull
2014-06-04 16:54:15 -07:00
resources: Clarify sanity check message
2014-05-23 10:47:21 -06:00
kernel/seccomp.c: kernel-doc warning fix
2014-06-06 16:08:15 -07:00
signals: introduce kernel_sigaction()
2014-06-06 16:08:12 -07:00
smp: print more useful debug info upon receiving IPI on an offline CPU
2014-06-06 16:08:12 -07:00
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
kernel/stop_machine.c: kernel-doc warning fix
2014-06-04 16:54:15 -07:00
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
sys_sgetmask/sys_ssetmask: add CONFIG_SGETMASK_SYSCALL
2014-06-04 16:54:14 -07:00
sysctl: convert use of typedef ctl_table to struct ctl_table
2014-06-06 16:08:16 -07:00
torture: Remove __init from torture_init_begin/end
2014-05-14 09:46:30 -07:00
kernel/tracepoint.c: kernel-doc fixes
2014-06-04 16:54:15 -07:00
tsacct: Use ktime_get_ts()
2014-06-12 16:18:45 +02:00
smp: Rename __smp_call_function_single() to smp_call_function_single_async()
2014-02-24 14:47:15 -08:00
kernel/user.c: drop unused field 'files' from user_struct
2014-06-04 16:54:16 -07:00
kernel/user_namespace.c: kernel-doc/checkpatch fixes
2014-06-06 16:08:13 -07:00
sysctl: convert use of typedef ctl_table to struct ctl_table
2014-06-06 16:08:16 -07:00
kernel/watchdog.c:touch_softlockup_watchdog(): use raw_cpu_write()
2014-04-18 16:40:08 -07:00
Linux 3.15-rc6
2014-05-22 10:28:56 +02:00
9f6d9baaa8