Jason Low 7c177d994e posix_cpu_timer: Optimize fastpath_timer_check() ...

In fastpath_timer_check(), the task_cputime() function is always
called to compute the utime and stime values. However, this is not
necessary if there are no per-thread timers to check for. This patch
modifies the code such that we compute the task_cputime values only
when there are per-thread timers set.

Signed-off-by: Jason Low <jason.low2@hp.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: George Spelvin <linux@horizon.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: hideaki.kimura@hpe.com
Cc: terry.rudd@hpe.com
Cc: scott.norton@hpe.com
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1444849677-29330-2-git-send-email-jason.low2@hp.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2015-10-15 11:23:41 +02:00

..

bpf

bpf: fix out of bounds access in verifier log

2015-09-09 14:11:55 -07:00

configs

kconfig: add xenconfig defconfig helper

2015-06-16 11:04:29 +01:00

debug

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events

perf: Fix races in computing the header sizes

2015-09-18 09:20:26 +02:00

gcov

gcov: add support for GCC 5.1

2015-06-30 19:44:57 -07:00

irq

genirq: Fix handle_bad_irq kerneldoc comment

2015-10-09 17:17:30 +02:00

livepatch

livepatch: Improve error handling in klp_disable_func()

2015-07-14 22:48:06 +02:00

locking

locking/lockdep: Fix hlock->pin_count reset on lock stack rebuilds

2015-09-23 09:48:53 +02:00

power

Merge branch 'for-4.3/core' of git://git.kernel.dk/linux-block

2015-09-02 13:10:25 -07:00

printk

kexec: split kexec_load syscall from kexec core code

2015-09-10 13:29:01 -07:00

rcu

rcu: Suppress lockdep false positive for rcp->exp_funnel_mutex

2015-09-20 21:01:22 -07:00

sched

sched/core: Fix TASK_DEAD race in finish_task_switch()

2015-10-06 17:05:17 +02:00

time

posix_cpu_timer: Optimize fastpath_timer_check()

2015-10-15 11:23:41 +02:00

trace

Merge tag 'trace-v4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2015-09-08 14:04:14 -07:00

.gitignore

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acct.c

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async.c

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audit_fsnotify.c

audit: clean simple fsnotify implementation

2015-08-06 16:14:53 -04:00

audit_tree.c

Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit

2015-09-08 13:34:59 -07:00

audit_watch.c

Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit

2015-09-08 13:34:59 -07:00

audit.c

Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit

2015-09-08 13:34:59 -07:00

audit.h

Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit

2015-09-08 13:34:59 -07:00

auditfilter.c

audit: implement audit by executable

2015-08-06 16:17:25 -04:00

auditsc.c

Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit

2015-09-08 13:34:59 -07:00

backtracetest.c

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bounds.c

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capability.c

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cgroup_freezer.c

cgroup: allow a cgroup subsystem to reject a fork

2015-07-14 17:29:23 -04:00

cgroup_pids.c

cgroup: pids: fix invalid get/put usage

2015-08-25 14:19:25 -04:00

cgroup.c

Revert "sched, cgroup: replace signal_struct->group_rwsem with a global percpu_rwsem"

2015-09-16 11:51:12 -04:00

compat.c

compat: cleanup coding in compat_get_bitmap() and compat_put_bitmap()

2015-06-04 23:57:18 +02:00

configs.c

…

context_tracking.c

…

cpu_pm.c

kernel/cpu_pm: fix cpu_cluster_pm_exit comment

2015-09-03 02:42:20 +02:00

cpu.c

Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-08-31 20:26:22 -07:00

cpuset.c

cpuset: use trialcs->mems_allowed as a temp variable

2015-08-10 11:18:41 -04:00

crash_dump.c

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cred.c

kernel/cred.c: remove unnecessary kdebug atomic reads

2015-09-10 13:29:01 -07:00

delayacct.c

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dma.c

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elfcore.c

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exec_domain.c

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exit.c

kernel: exit: fix typo in comment

2015-08-07 13:59:49 +02:00

extable.c

kernel/extable.c: remove duplicated include

2015-09-10 13:29:01 -07:00

fork.c

Revert "sched, cgroup: replace signal_struct->group_rwsem with a global percpu_rwsem"

2015-09-16 11:51:12 -04:00

freezer.c

…

futex_compat.c

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futex.c

futex: Make should_fail_futex() static

2015-07-20 21:43:54 +02:00

groups.c

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hung_task.c

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irq_work.c

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jump_label.c

locking/static_keys: Add selftest

2015-08-03 11:34:16 +02:00

kallsyms.c

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kcmp.c

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Kconfig.freezer

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Kconfig.hz

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Kconfig.locks

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Kconfig.preempt

…

kexec_core.c

kexec: export KERNEL_IMAGE_SIZE to vmcoreinfo

2015-09-10 13:29:01 -07:00

kexec_file.c

kexec: split kexec_file syscall code to kexec_file.c

2015-09-10 13:29:01 -07:00

kexec_internal.h

kexec: split kexec_file syscall code to kexec_file.c

2015-09-10 13:29:01 -07:00

kexec.c

kexec: split kexec_load syscall from kexec core code

2015-09-10 13:29:01 -07:00

kmod.c

kmod: handle UMH_WAIT_PROC from system unbound workqueue

2015-09-10 13:29:01 -07:00

kprobes.c

perf/x86/hw_breakpoints: Disallow kernel breakpoints unless kprobe-safe

2015-08-04 10:16:54 +02:00

ksysfs.c

kexec: split kexec_load syscall from kexec core code

2015-09-10 13:29:01 -07:00

kthread.c

kernel/kthread.c:kthread_create_on_node(): clarify documentation

2015-09-04 16:54:41 -07:00

latencytop.c

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Makefile

sys_membarrier(): system-wide memory barrier (generic, x86)

2015-09-11 15:21:34 -07:00

membarrier.c

sys_membarrier(): system-wide memory barrier (generic, x86)

2015-09-11 15:21:34 -07:00

memremap.c

add devm_memremap_pages

2015-08-27 19:40:58 -04:00

module_signing.c

PKCS#7: Appropriately restrict authenticated attributes and content type

2015-08-12 17:01:01 +01:00

module-internal.h

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module.c

module: weaken locking assertion for oops path.

2015-07-29 06:13:22 +09:30

notifier.c

Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-09-01 08:40:25 -07:00

nsproxy.c

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padata.c

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panic.c

kernel/panic/kexec: fix "crash_kexec_post_notifiers" option issue in oops path

2015-06-30 19:44:57 -07:00

params.c

Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

2015-07-01 10:49:25 -07:00

pid_namespace.c

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pid.c

rcu: Rename rcu_lockdep_assert() to RCU_LOCKDEP_WARN()

2015-07-22 15:27:32 -07:00

profile.c

mm: rename alloc_pages_exact_node() to __alloc_pages_node()

2015-09-08 15:35:28 -07:00

ptrace.c

seccomp: add ptrace options for suspend/resume

2015-07-15 11:52:52 -07:00

range.c

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reboot.c

kexec: split kexec_load syscall from kexec core code

2015-09-10 13:29:01 -07:00

relay.c

kernel/relay.c: use kvfree() in relay_free_page_array()

2015-06-30 19:44:59 -07:00

resource.c

mm: enhance region_is_ram() to region_intersects()

2015-08-10 23:07:05 -04:00

seccomp.c

Merge tag 'seccomp-next' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux into next

2015-07-20 17:19:19 +10:00

signal.c

signal: fix information leak in copy_siginfo_to_user

2015-08-07 04:39:40 +03:00

smp.c

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smpboot.c

smpboot: allow passing the cpumask on per-cpu thread registration

2015-09-04 16:54:41 -07:00

smpboot.h

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softirq.c

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stacktrace.c

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stop_machine.c

stop_machine: Remove cpu_stop_work's from list in cpu_stop_park()

2015-08-03 12:21:28 +02:00

sys_ni.c

sys_membarrier(): system-wide memory barrier (generic, x86)

2015-09-11 15:21:34 -07:00

sys.c

vfs: Commit to never having exectuables on proc and sysfs.

2015-07-10 10:39:25 -05:00

sysctl_binary.c

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sysctl.c

sysctl: fix int -> unsigned long assignments in INT_MIN case

2015-09-10 13:29:01 -07:00

task_work.c

task_work: remove fifo ordering guarantee

2015-09-05 13:46:58 -07:00

taskstats.c

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test_kprobes.c

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torture.c

rcu: Convert ACCESS_ONCE() to READ_ONCE() and WRITE_ONCE()

2015-05-27 12:56:15 -07:00

tracepoint.c

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tsacct.c

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uid16.c

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up.c

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user_namespace.c

capabilities: ambient capabilities

2015-09-04 16:54:41 -07:00

user-return-notifier.c

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user.c

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utsname_sysctl.c

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utsname.c

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watchdog.c

watchdog: rename watchdog_suspend() and watchdog_resume()

2015-09-04 16:54:41 -07:00

workqueue_internal.h

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workqueue.c

Merge branch 'for-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

2015-09-02 08:02:20 -07:00