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Gaurav Jindal 1f3b0f8243 tick/nohz: Optimize nohz idle enter 
tick_nohz_start_idle is called before checking whether the idle tick can be
stopped. If the tick cannot be stopped, calling tick_nohz_start_idle() is
pointless and just wasting CPU cycles.

Only invoke tick_nohz_start_idle() when can_stop_idle_tick() returns true. A
short one minute observation of the effect on ARM64 shows a reduction of calls
by 1.5% thus optimizing the idle entry sequence.

[tglx: Massaged changelog ]

Co-developed-by: Sanjeev Yadav<sanjeev.yadav@spreadtrum.com>
Signed-off-by: Gaurav Jindal<gaurav.jindal@spreadtrum.com>
Link: http://lkml.kernel.org/r/20160714120416.GB21099@gaurav.jindal@spreadtrum.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-07-19 13:48:24 +02:00
..
bpf
bpf: fix matching of data/data_end in verifier
2016-06-15 23:37:54 -07:00
configs
…
debug
mm/init: Add 'rodata=off' boot cmdline parameter to disable read-only kernel mappings
2016-02-22 08:51:37 +01:00
events
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2016-06-29 11:50:42 -07:00
gcov
gcov: disable for COMPILE_TEST
2016-05-10 17:12:49 +02:00
irq
irqchip updates for 4.7-rc1:
2016-06-03 15:05:51 +02:00
livepatch
Merge branches 'for-4.7/core', 'for-4.7/livepatching-doc' and 'for-4.7/livepatching-ppc64' into for-linus
2016-05-17 12:06:35 +02:00
locking
locking: avoid passing around 'thread_info' in mutex debugging code
2016-06-23 12:11:17 -07:00
power
oom, suspend: fix oom_reaper vs. oom_killer_disable race
2016-06-24 17:23:52 -07:00
printk
printk/nmi: flush NMI messages on the system panic
2016-05-20 17:58:30 -07:00
rcu
debugobjects: insulate non-fixup logic related to static obj from fixup callbacks
2016-05-19 19:12:14 -07:00
sched
sched/core: Allow kthreads to fall back to online && !active cpus
2016-06-24 08:26:53 +02:00
time
tick/nohz: Optimize nohz idle enter
2016-07-19 13:48:24 +02:00
trace
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2016-06-29 11:50:42 -07:00
.gitignore
certs: add .gitignore to stop git nagging about x509_certificate_list
2015-10-21 15:18:35 +01:00
acct.c
…
async.c
async: export current_is_async()
2015-11-19 17:51:48 +01:00
audit_fsnotify.c
wrappers for ->i_mutex access
2016-01-22 18:04:28 -05:00
audit_tree.c
audit: cleanup prune_tree_thread
2016-04-04 09:46:47 -04:00
audit_watch.c
don't bother with ->d_inode->i_sb - it's always equal to ->d_sb
2016-04-10 17:11:51 -04:00
audit.c
Merge branch 'stable-4.7' of git://git.infradead.org/users/pcmoore/audit
2016-06-29 15:18:47 -07:00
audit.h
audit: move audit_get_tty to reduce scope and kabi changes
2016-06-28 15:48:48 -04:00
auditfilter.c
audit: Fix typo in comment
2016-02-08 11:25:39 -05:00
auditsc.c
Merge branch 'stable-4.7' of git://git.infradead.org/users/pcmoore/audit
2016-06-29 15:18:47 -07:00
backtracetest.c
…
bounds.c
…
capability.c
…
cgroup_freezer.c
cgroup: kill cgrp_ss_priv[CGROUP_CANFORK_COUNT] and friends
2015-12-03 10:24:08 -05:00
cgroup_pids.c
cgroup_pids: fix a typo.
2015-12-14 14:54:37 -05:00
cgroup.c
cgroup: Disable IRQs while holding css_set_lock
2016-06-23 17:23:12 -04:00
compat.c
…
configs.c
…
context_tracking.c
context_tracking: Switch to new static_branch API
2015-11-24 09:56:43 +01:00
cpu_pm.c
…
cpu.c
sched/hotplug: Make activate() the last hotplug step
2016-05-06 14:58:25 +02:00
cpuset.c
cpuset: use static key better and convert to new API
2016-05-19 19:12:14 -07:00
crash_dump.c
…
cred.c
kmemcg: account certain kmem allocations to memcg
2016-01-14 16:00:49 -08:00
delayacct.c
kmemcg: account certain kmem allocations to memcg
2016-01-14 16:00:49 -08:00
dma.c
…
elfcore.c
…
exec_domain.c
…
exit.c
wait: allow sys_waitid() to accept __WNOTHREAD/__WCLONE/__WALL
2016-05-23 17:04:14 -07:00
extable.c
kernel/extable.c: remove duplicated include
2015-09-10 13:29:01 -07:00
fork.c
Fix build break in fork.c when THREAD_SIZE < PAGE_SIZE
2016-06-25 06:01:28 -07:00
freezer.c
…
futex_compat.c
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-01-20 17:09:18 -08:00
futex.c
futex: Calculate the futex key based on a tail page for file-based futexes
2016-06-08 19:23:54 +02:00
groups.c
…
hung_task.c
kernel/hung_task.c: use timeout diff when timeout is updated
2016-03-22 15:36:02 -07:00
irq_work.c
treewide: Remove old email address
2015-11-23 09:44:58 +01:00
jump_label.c
locking/static_key: Fix concurrent static_key_slow_inc()
2016-06-24 08:23:16 +02:00
kallsyms.c
kallsyms: add support for relative offsets in kallsyms address table
2016-03-15 16:55:16 -07:00
kcmp.c
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-01-20 17:09:18 -08:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
kernel/kcov: unproxify debugfs file's fops
2016-06-15 04:56:35 -07:00
kexec_core.c
s390/kexec: consolidate crash_map/unmap_reserved_pages() and arch_kexec_protect(unprotect)_crashkres()
2016-05-23 17:04:14 -07:00
kexec_file.c
kexec: introduce a protection mechanism for the crashkernel reserved memory
2016-05-23 17:04:14 -07:00
kexec_internal.h
kexec: move some memembers and definitions within the scope of CONFIG_KEXEC_FILE
2016-01-20 17:09:18 -08:00
kexec.c
s390/kexec: consolidate crash_map/unmap_reserved_pages() and arch_kexec_protect(unprotect)_crashkres()
2016-05-23 17:04:14 -07:00
kmod.c
kmod: don't run async usermode helper as a child of kworker thread
2015-10-23 17:55:10 +09:00
kprobes.c
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ksysfs.c
rcu: Remove TINY_RCU bloat from pointless boot parameters
2015-12-07 16:59:37 -08:00
kthread.c
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latencytop.c
sched/debug: Make schedstats a runtime tunable that is disabled by default
2016-02-09 11:54:23 +01:00
Makefile
ELF/MIPS build fix
2016-05-23 17:04:14 -07:00
membarrier.c
sys_membarrier(): system-wide memory barrier (generic, x86)
2015-09-11 15:21:34 -07:00
memremap.c
memremap: add arch specific hook for MEMREMAP_WB mappings
2016-04-04 10:26:41 +02:00
module_signing.c
KEYS: Move the point of trust determination to __key_link()
2016-04-11 22:43:43 +01:00
module-internal.h
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module.c
module: preserve Elf information for livepatch modules
2016-04-01 15:00:10 +02:00
notifier.c
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nsproxy.c
cgroup: introduce cgroup namespaces
2016-02-16 13:04:58 -05:00
padata.c
kernel/padata.c: hide unused functions
2016-05-19 19:12:14 -07:00
panic.c
printk/nmi: flush NMI messages on the system panic
2016-05-20 17:58:30 -07:00
params.c
Nothing exciting, minor tweaks and cleanups.
2015-11-09 15:53:39 -08:00
pid_namespace.c
…
pid.c
remove lots of IS_ERR_VALUE abuses
2016-05-27 15:26:11 -07:00
profile.c
profile: hide unused functions when !CONFIG_PROC_FS
2016-03-22 15:36:02 -07:00
ptrace.c
ptrace: change __ptrace_unlink() to clear ->ptrace under ->siglock
2016-03-22 15:36:02 -07:00
range.c
…
reboot.c
kexec: split kexec_load syscall from kexec core code
2015-09-10 13:29:01 -07:00
relay.c
kernel/relay.c: fix potential memory leak
2016-06-09 14:23:11 -07:00
resource.c
/proc/iomem: only expose physical resource addresses to privileged users
2016-04-14 12:56:09 -07:00
seccomp.c
Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
2016-05-19 10:02:26 -07:00
signal.c
signals: Use hrtimer for sigtimedwait()
2016-07-07 10:35:07 +02:00
smp.c
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-03-15 13:50:29 -07:00
smpboot.c
cpu/hotplug: Unpark smpboot threads from the state machine
2016-03-01 20:36:56 +01:00
smpboot.h
cpu/hotplug: Create hotplug threads
2016-03-01 20:36:56 +01:00
softirq.c
arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections
2016-03-25 16:37:42 -07:00
stacktrace.c
…
stop_machine.c
kernel/stop_machine.c: remove CONFIG_SMP dependencies
2016-01-16 11:17:24 -08:00
sys_ni.c
vfs: add copy_file_range syscall and vfs helper
2015-12-01 14:00:53 -05:00
sys.c
prctl: make PR_SET_THP_DISABLE wait for mmap_sem killable
2016-05-23 17:04:14 -07:00
sysctl_binary.c
kernel/sysctl_binary.c: use generic UUID library
2016-05-20 17:58:30 -07:00
sysctl.c
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-05-25 17:05:40 -07:00
task_work.c
…
taskstats.c
taskstats: use the libnl API to align nlattr on 64-bit
2016-04-23 20:13:25 -04:00
test_kprobes.c
…
torture.c
rcutorture: Dump trace buffer upon shutdown
2016-04-21 13:47:04 -07:00
tracepoint.c
kernel/...: convert pr_warning to pr_warn
2016-03-22 15:36:02 -07:00
tsacct.c
time, acct: Drop irq save & restore from __acct_update_integrals()
2016-02-29 09:53:09 +01:00
uid16.c
…
up.c
…
user_namespace.c
kernel/*: switch to memdup_user_nul()
2016-01-04 10:27:55 -05:00
user-return-notifier.c
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user.c
…
utsname_sysctl.c
…
utsname.c
…
watchdog.c
watchdog: don't run proc_watchdog_update if new value is same as old
2016-03-17 15:09:34 -07:00
workqueue_internal.h
sched/core: Get rid of 'cpu' argument in wq_worker_sleeping()
2016-03-02 10:28:47 -05:00
workqueue.c
debugobjects: insulate non-fixup logic related to static obj from fixup callbacks
2016-05-19 19:12:14 -07:00