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john stultz 17c38b7490 Cache xtime every call to update_wall_time 
This avoids xtime lag seen with dynticks, because while 'xtime' itself
is still not updated often, we keep a 'xtime_cache' variable around that
contains the approximate real-time that _is_ updated each time we do a
'update_wall_time()', and is thus never off by more than one tick.

IOW, this restores the original semantics for 'xtime' users, as long as
you use the proper abstraction functions (ie 'current_kernel_time()' or
'get_seconds()' depending on whether you want a timespec or just the
seconds field).

[ Updated Patch.  As penance for my sins I've also yanked another #ifdef
  that was added to avoid the xtime lag w/ hrtimers.  ]

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-25 10:17:44 -07:00
..
irq
x86_64: Report the pending irq if available in smp_affinity
2007-07-21 18:37:07 -07:00
power
x86: PM_TRACE support
2007-07-21 18:37:10 -07:00
time
Cache xtime every call to update_wall_time
2007-07-25 10:17:44 -07:00
.gitignore
gitignore: ignore more generated files
2006-01-03 11:35:26 +01:00
acct.c
Cleanup non-arch xtime uses, use get_seconds() or current_kernel_time().
2007-07-25 10:09:20 -07:00
audit.c
Freezer: make kernel threads nonfreezable by default
2007-07-17 10:23:02 -07:00
audit.h
Audit: add TTY input auditing
2007-07-16 09:05:47 -07:00
auditfilter.c
[PATCH] allow audit filtering on bit & operations
2007-07-22 09:57:02 -04:00
auditsc.c
[PATCH] get rid of AVC_PATH postponed treatment
2007-07-22 09:57:02 -04:00
capability.c
[PATCH] pid: replace do/while_each_task_pid with do/while_each_pid_task
2007-02-12 09:48:32 -08:00
compat.c
signal/timer/event: timerfd compat code
2007-05-11 08:29:36 -07:00
configs.c
use simple_read_from_buffer in kernel/
2007-05-09 12:30:49 -07:00
cpu.c
HOTPLUG: Add CPU_DYING notifier
2007-07-16 12:05:49 +03:00
cpuset.c
usermodehelper: Tidy up waiting
2007-07-18 08:47:40 -07:00
delayacct.c
sched: update delay-accounting to use CFS's precise stats
2007-07-09 18:52:00 +02:00
die_notifier.c
move die notifier handling to common code
2007-05-08 11:15:04 -07:00
dma.c
[PATCH] struct seq_operations and struct file_operations constification
2006-12-07 08:39:46 -08:00
exec_domain.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
exit.c
Freezer: avoid freezing kernel threads prematurely
2007-07-19 10:04:42 -07:00
extable.c
[PATCH] symbol_put_addr() locks kernel
2006-05-15 11:20:55 -07:00
fork.c
mm: Remove slab destructors from kmem_cache_create().
2007-07-20 10:11:58 +09:00
futex_compat.c
Revert "futex_requeue_pi optimization"
2007-06-18 09:48:41 -07:00
futex.c
mm: fault feedback #2
2007-07-19 10:04:41 -07:00
hrtimer.c
Cache xtime every call to update_wall_time
2007-07-25 10:17:44 -07:00
itimer.c
The scheduled -EINVAL for invalid timevals in setitimer
2007-05-08 11:15:13 -07:00
kallsyms.c
kallsyms: make KSYM_NAME_LEN include space for trailing '\0'
2007-07-17 10:23:03 -07:00
Kconfig.hz
[PATCH] HZ: 300Hz support
2006-12-07 08:39:36 -08:00
Kconfig.preempt
Fix trivial typos in Kconfig* files
2007-05-09 07:12:20 +02:00
kexec.c
kdump/kexec: calculate note size at compile time
2007-05-08 11:15:07 -07:00
kfifo.c
is_power_of_2: kernel/kfifo.c
2007-07-16 09:05:50 -07:00
kmod.c
PM: prevent frozen user mode helpers from failing the freezing of tasks
2007-07-19 10:04:42 -07:00
kprobes.c
jprobes: make jprobes a little safer for users
2007-07-19 10:04:44 -07:00
ksysfs.c
FRV: Fix linkage problems
2007-07-20 12:01:34 -07:00
kthread.c
mm: fix improper .init-type section references
2007-07-16 09:05:36 -07:00
latency.c
[PATCH] severing module.h->sched.h
2006-12-04 02:00:22 -05:00
lockdep_internals.h
[PATCH] lockdep: more chains
2006-12-07 08:39:43 -08:00
lockdep_proc.c
lockstat: better class name representation
2007-07-19 10:04:49 -07:00
lockdep.c
lockdep debugging: give stacktrace for init_error
2007-07-19 10:04:49 -07:00
Makefile
user namespace: add the framework
2007-07-16 09:05:47 -07:00
module.c
kallsyms: make KSYM_NAME_LEN include space for trailing '\0'
2007-07-17 10:23:03 -07:00
mutex-debug.c
[PATCH] remove many unneeded #includes of sched.h
2007-02-14 08:09:54 -08:00
mutex-debug.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
mutex.c
lockstat: measure lock bouncing
2007-07-19 10:04:49 -07:00
mutex.h
[PATCH] lockdep: prove mutex locking correctness
2006-07-03 15:27:04 -07:00
nsproxy.c
mm: Remove slab destructors from kmem_cache_create().
2007-07-20 10:11:58 +09:00
panic.c
Report that kernel is tainted if there was an OOPS
2007-07-17 10:23:02 -07:00
params.c
sysfs: kill unnecessary attribute->owner
2007-07-11 16:09:06 -07:00
pid.c
namespace: ensure clone_flags are always stored in an unsigned long
2007-07-16 09:05:48 -07:00
posix-cpu-timers.c
sched: make posix-cpu-timers use CFS's accounting information
2007-07-09 18:51:58 +02:00
posix-timers.c
mm: Remove slab destructors from kmem_cache_create().
2007-07-20 10:11:58 +09:00
printk.c
kernel/printk.c: document possible deadlock against scheduler
2007-07-16 09:05:52 -07:00
profile.c
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
ptrace.c
coredump masking: reimplementation of dumpable using two flags
2007-07-19 10:04:46 -07:00
rcupdate.c
Add suspend-related notifications for CPU hotplug
2007-05-09 12:30:56 -07:00
rcutorture.c
Freezer: make kernel threads nonfreezable by default
2007-07-17 10:23:02 -07:00
relay.c
kernel/relay.c: make functions static
2007-07-19 10:04:47 -07:00
resource.c
libata/IDE: remove combined mode quirk
2007-04-28 14:15:59 -04:00
rtmutex_common.h
FUTEX: Tidy up the code
2007-07-16 09:05:49 -07:00
rtmutex-debug.c
FUTEX: Tidy up the code
2007-07-16 09:05:49 -07:00
rtmutex-debug.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
rtmutex-tester.c
Freezer: make kernel threads nonfreezable by default
2007-07-17 10:23:02 -07:00
rtmutex.c
FUTEX: Tidy up the code
2007-07-16 09:05:49 -07:00
rtmutex.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
rwsem.c
lockstat: hook into spinlock_t, rwlock_t, rwsem and mutex
2007-07-19 10:04:49 -07:00
sched_debug.c
[PATCH] sched: remove stale version info from kernel/sched_debug.c
2007-07-13 10:10:41 -07:00
sched_fair.c
sched: cfs core, kernel/sched_fair.c
2007-07-09 18:51:58 +02:00
sched_idletask.c
sched: cfs core, kernel/sched_idletask.c
2007-07-09 18:51:58 +02:00
sched_rt.c
sched: cfs core, kernel/sched_rt.c
2007-07-09 18:51:58 +02:00
sched_stats.h
sched: update delay-accounting to use CFS's precise stats
2007-07-09 18:52:00 +02:00
sched.c
[PATCH] sched: implement cpu_clock(cpu) high-speed time source
2007-07-19 21:28:35 +02:00
seccomp.c
make seccomp zerocost in schedule
2007-07-16 09:05:50 -07:00
signal.c
x86: i386-show-unhandled-signals-v3
2007-07-22 11:03:37 -07:00
softirq.c
Freezer: make kernel threads nonfreezable by default
2007-07-17 10:23:02 -07:00
softlockup.c
Freezer: make kernel threads nonfreezable by default
2007-07-17 10:23:02 -07:00
spinlock.c
lockstat: hook into spinlock_t, rwlock_t, rwsem and mutex
2007-07-19 10:04:49 -07:00
srcu.c
[PATCH] SRCU: report out-of-memory errors
2006-10-04 07:55:30 -07:00
stacktrace.c
[PATCH] lockdep: stacktrace subsystem, core
2006-07-03 15:27:02 -07:00
stop_machine.c
Fix stop_machine_run problem with naughty real time process
2007-07-16 09:05:41 -07:00
sys_ni.c
diskquota: 32bit quota tools on 64bit architectures
2007-07-16 09:05:48 -07:00
sys.c
coredump masking: reimplementation of dumpable using two flags
2007-07-19 10:04:46 -07:00
sysctl.c
x86: i386-show-unhandled-signals-v3
2007-07-22 11:03:37 -07:00
taskstats.c
taskstats: add context-switch counters
2007-07-16 09:05:46 -07:00
time.c
Cleanup non-arch xtime uses, use get_seconds() or current_kernel_time().
2007-07-25 10:09:20 -07:00
timer.c
Pull ia64-clocksource into release branch
2007-07-20 11:26:47 -07:00
tsacct.c
Cleanup non-arch xtime uses, use get_seconds() or current_kernel_time().
2007-07-25 10:09:20 -07:00
uid16.c
header cleaning: don't include smp_lock.h when not used
2007-05-08 11:15:07 -07:00
user_namespace.c
fix create_new_namespaces() return value
2007-07-16 09:05:47 -07:00
user.c
mm: Remove slab destructors from kmem_cache_create().
2007-07-20 10:11:58 +09:00
utsname_sysctl.c
remove CONFIG_UTS_NS and CONFIG_IPC_NS
2007-07-16 09:05:47 -07:00
utsname.c
namespace: ensure clone_flags are always stored in an unsigned long
2007-07-16 09:05:48 -07:00
wait.c
Fix occurrences of "the the "
2007-05-09 08:57:56 +02:00
workqueue.c
destroy_workqueue() can livelock
2007-07-17 10:23:03 -07:00