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Peter Zijlstra 354879bb97 sched_clock: fix cpu_clock() 
This patch fixes 3 issues:

a) it removes the dependency on jiffies, because jiffies are incremented
   by a single CPU, and the tick is not synchronized between CPUs. Therefore
   relying on it to calculate a window to clip whacky TSC values doesn't work
   as it can drift around.

   So instead use [GTOD, GTOD+TICK_NSEC) as the window.

b) __update_sched_clock() did (roughly speaking):

   delta = sched_clock() - scd->tick_raw;
   clock += delta;

   Which gives exponential growth, instead of linear.

c) allows the sched_clock_cpu() value to warp the u64 without breaking.

the results are more reliable sched_clock() deltas:

           before       after   sched_clock

cpu_clock: 15750        51312   51488
cpu_clock: 59719        51052   50947
cpu_clock: 15879        51249   51061
cpu_clock: 1            50933   51198
cpu_clock: 1            50931   51039
cpu_clock: 1            51093   50981
cpu_clock: 1            51043   51040
cpu_clock: 1            50959   50938
cpu_clock: 1            50981   51011
cpu_clock: 1            51364   51212
cpu_clock: 1            51219   51273
cpu_clock: 1            51389   51048
cpu_clock: 1            51285   51611
cpu_clock: 1            50964   51137
cpu_clock: 1            50973   50968
cpu_clock: 1            50967   50972
cpu_clock: 1            58910   58485
cpu_clock: 1            51082   51025
cpu_clock: 1            50957   50958
cpu_clock: 1            50958   50957
cpu_clock: 1006128      51128   50971
cpu_clock: 1            51107   51155
cpu_clock: 1            51371   51081
cpu_clock: 1            51104   51365
cpu_clock: 1            51363   51309
cpu_clock: 1            51107   51160
cpu_clock: 1            51139   51100
cpu_clock: 1            51216   51136
cpu_clock: 1            51207   51215
cpu_clock: 1            51087   51263
cpu_clock: 1            51249   51177
cpu_clock: 1            51519   51412
cpu_clock: 1            51416   51255
cpu_clock: 1            51591   51594
cpu_clock: 1            50966   51374
cpu_clock: 1            50966   50966
cpu_clock: 1            51291   50948
cpu_clock: 1            50973   50867
cpu_clock: 1            50970   50970
cpu_clock: 998306       50970   50971
cpu_clock: 1            50971   50970
cpu_clock: 1            50970   50970
cpu_clock: 1            50971   50971
cpu_clock: 1            50970   50970
cpu_clock: 1            51351   50970
cpu_clock: 1            50970   51352
cpu_clock: 1            50971   50970
cpu_clock: 1            50970   50970
cpu_clock: 1            51321   50971
cpu_clock: 1            50974   51324

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-08-25 17:39:57 +02:00
..
irq
genirq: switch /proc/irq/*/smp_affinity et al to seqfiles
2008-08-12 16:07:30 -07:00
power
kexec jump: save/restore device state
2008-07-26 12:00:04 -07:00
time
sched clock: revert various sched_clock() changes
2008-07-31 17:20:29 +02:00
trace
Merge branch 'linus' into cpus4096
2008-07-28 23:32:00 +02:00
.gitignore
Update kernel/.gitignore with new auto-generated files
2008-02-09 23:27:01 -08:00
acct.c
bsdacct: fix and add comments around acct_process()
2008-07-25 10:53:47 -07:00
audit_tree.c
[PATCH] list_for_each_rcu must die: audit
2008-05-17 03:30:23 -04:00
audit.c
[PATCH] Fix the bug of using AUDIT_STATUS_RATE_LIMIT when set fail, no error output.
2008-08-01 12:15:16 -04:00
audit.h
[PATCH 1/2] audit: move extern declarations to audit.h
2008-04-28 06:28:04 -04:00
auditfilter.c
Re: [PATCH] the loginuid field should be output in all AUDIT_CONFIG_CHANGE audit messages
2008-08-01 12:15:03 -04:00
auditsc.c
Re: [PATCH] Fix the kernel panic of audit_filter_task when key field is set
2008-08-04 06:13:50 -04:00
backtracetest.c
backtrace: replace timer with tasklet + completions
2008-06-27 18:09:16 +02:00
bounds.c
Add kbuild.h that contains common definitions for kbuild users
2008-04-29 08:06:29 -07:00
capability.c
security: Fix setting of PF_SUPERPRIV by __capable()
2008-08-14 22:59:43 +10:00
cgroup_debug.c
CGroup API files: move "releasable" to cgroup_debug subsystem
2008-04-29 08:06:09 -07:00
cgroup.c
cgroup: uninline cgroup_has_css_refs()
2008-07-30 09:41:44 -07:00
compat.c
ntp: support for TAI
2008-05-01 08:03:59 -07:00
configs.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
cpu.c
cpu hotplug: s390 doesn't support additional_cpus anymore.
2008-08-12 16:07:28 -07:00
cpuset.c
cpuset: clean up cpuset hierarchy traversal code
2008-07-30 09:41:44 -07:00
delayacct.c
per-task-delay-accounting: update taskstats for memory reclaim delay
2008-07-25 10:53:47 -07:00
dma-coherent.c
DMA: make dma-coherent.c documentation kdoc-friendly
2008-08-07 06:52:01 -07:00
dma.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
exec_domain.c
[PATCH] kill altroot
2008-07-26 20:53:20 -04:00
exit.c
tracehook: fix exit_signal=0 case
2008-08-01 12:01:11 -07:00
extable.c
…
fork.c
mmu-notifiers: core
2008-07-28 16:30:21 -07:00
futex_compat.c
futex_compat __user annotation
2008-03-30 14:18:41 -07:00
futex.c
futexes: fix fault handling in futex_lock_pi
2008-06-23 13:31:15 +02:00
hrtimer.c
Merge branch 'generic-ipi' into generic-ipi-for-linus
2008-07-15 21:55:59 +02:00
itimer.c
ITIMER_REAL: convert to use struct pid
2008-02-08 09:22:29 -08:00
kallsyms.c
kallsyms: fix potential overflow in binary search
2008-07-25 10:53:27 -07:00
Kconfig.hz
sched: fix SCHED_HRTICK dependency
2008-07-28 14:37:38 +02:00
Kconfig.preempt
rcu: move PREEMPT_RCU config option back under PREEMPT
2008-03-10 18:01:20 -07:00
kexec.c
kexec: use a mutex for locking rather than xchg()
2008-08-15 08:35:43 -07:00
kfifo.c
…
kgdb.c
kgdb: fix gdb serial thread queries
2008-08-01 08:39:35 -05:00
kmod.c
call_usermodehelper(): increase reliability
2008-07-25 10:53:28 -07:00
kprobes.c
kprobes: remove redundant config check
2008-07-25 10:53:30 -07:00
ksysfs.c
…
kthread.c
tracehook: wait_task_inactive
2008-07-26 12:00:09 -07:00
latencytop.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
lockdep_internals.h
lockdep: build fix
2008-08-13 12:55:10 +02:00
lockdep_proc.c
lockdep: fix build if CONFIG_PROVE_LOCKING not defined
2008-08-15 19:22:04 +02:00
lockdep.c
lockdep: fix spurious 'inconsistent lock state' warning
2008-08-18 09:42:31 +02:00
Makefile
Merge branch 'linus' into core/generic-dma-coherent
2008-07-29 00:07:55 +02:00
marker.c
markers: fix markers read barrier for multiple probes
2008-07-30 09:41:45 -07:00
module.c
modules: extend initcall_debug functionality to the module loader
2008-08-12 17:52:54 +10:00
mutex-debug.c
mutex-debug: check mutex magic before owner
2008-05-16 16:53:35 +02:00
mutex-debug.h
…
mutex.c
locking: fix mutex @key parameter kernel-doc notation
2008-07-28 18:12:36 +02:00
mutex.h
…
notifier.c
ipc: re-enable msgmni automatic recomputing msgmni if set to negative
2008-04-29 08:06:13 -07:00
ns_cgroup.c
cgroup_clone: use pid of newly created task for new cgroup
2008-07-25 10:53:37 -07:00
nsproxy.c
cgroup_clone: use pid of newly created task for new cgroup
2008-07-25 10:53:37 -07:00
panic.c
Add a WARN() macro; this is WARN_ON() + printk arguments
2008-07-25 10:53:29 -07:00
params.c
Add new string functions strict_strto* and convert kernel params to use them
2008-02-08 09:22:41 -08:00
pid_namespace.c
bsdacct: switch from global bsd_acct_struct instance to per-pidns one
2008-07-25 10:53:47 -07:00
pid.c
pidns: remove now unused find_pid function.
2008-07-25 10:53:45 -07:00
pm_qos_params.c
pm_qos: spelling fixes
2008-08-05 14:33:50 -07:00
posix-cpu-timers.c
posix-timers: print RT watchdog message
2008-05-24 18:49:22 +02:00
posix-timers.c
Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-08-11 16:46:11 -07:00
printk.c
printk: fix comment for printk ratelimiting
2008-07-30 09:41:45 -07:00
profile.c
build kernel/profile.o only when requested
2008-07-25 10:53:27 -07:00
ptrace.c
security: Fix setting of PF_SUPERPRIV by __capable()
2008-08-14 22:59:43 +10:00
rcuclassic.c
stop_machine: Wean existing callers off stop_machine_run()
2008-07-28 12:16:31 +10:00
rcupdate.c
Merge branch 'generic-ipi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-07-15 14:12:03 -07:00
rcupreempt_trace.c
rcu: remove duplicated include in kernel/rcupreempt_trace.c
2008-05-19 10:03:39 +02:00
rcupreempt.c
Merge branch 'linus' into cpus4096
2008-07-16 00:29:07 +02:00
rcutorture.c
rcu: make rcutorture even more vicious: invoke RCU readers from irq handlers (timers)
2008-06-26 09:24:33 +02:00
relay.c
relay: fix "full buffer with exactly full last subbuffer" accounting problem
2008-08-05 14:33:46 -07:00
res_counter.c
cgroup files: convert res_counter_write() to be a cgroups write_string() handler
2008-07-25 10:53:36 -07:00
resource.c
resource: add resource_size()
2008-07-30 09:41:43 -07:00
rtmutex_common.h
Don't operate with pid_t in rtmutex tester
2008-02-08 09:22:41 -08:00
rtmutex-debug.c
Don't operate with pid_t in rtmutex tester
2008-02-08 09:22:41 -08:00
rtmutex-debug.h
…
rtmutex-tester.c
sysdev: Pass the attribute to the low level sysdev show/store function
2008-07-21 21:55:02 -07:00
rtmutex.c
hrtimer: more hrtimer_init_sleeper() fallout.
2008-02-13 15:45:36 +01:00
rtmutex.h
…
rwsem.c
…
sched_clock.c
sched_clock: fix cpu_clock()
2008-08-25 17:39:57 +02:00
sched_cpupri.c
sched: use a 2-d bitmap for searching lowest-pri CPU
2008-06-06 15:19:28 +02:00
sched_cpupri.h
sched: fix the cpuprio count really
2008-06-06 15:19:44 +02:00
sched_debug.c
sched: add full schedstats to /proc/sched_debug
2008-06-27 14:31:31 +02:00
sched_fair.c
sched: fix mysql+oltp regression
2008-08-11 14:49:29 +02:00
sched_features.h
sched: enable LB_BIAS by default
2008-08-21 08:18:02 +02:00
sched_idletask.c
sched: make rt_sched_class, idle_sched_class static
2008-05-05 23:56:17 +02:00
sched_rt.c
sched: fix rt-bandwidth hotplug race
2008-08-14 15:50:58 +02:00
sched_stats.h
sched: fix accounting in task delay accounting & migration
2008-07-04 12:50:23 +02:00
sched.c
Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-08-16 17:15:32 -07:00
seccomp.c
…
semaphore.c
semaphore: __down_common: use signal_pending_state()
2008-08-05 14:33:47 -07:00
signal.c
Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-08-11 16:46:11 -07:00
smp.c
generic-ipi: fix stack and rcu interaction bug in smp_call_function_mask(), fix
2008-08-12 11:21:27 +02:00
softirq.c
Full conversion to early_initcall() interface, remove old interface
2008-07-26 12:00:04 -07:00
softlockup.c
Full conversion to early_initcall() interface, remove old interface
2008-07-26 12:00:04 -07:00
spinlock.c
lockdep: spin_lock_nest_lock(), checkpatch fixes
2008-08-13 13:56:51 +02:00
srcu.c
…
stacktrace.c
stacktrace: fix modular build, export print_stack_trace and save_stack_trace
2008-06-30 09:20:55 +02:00
stop_machine.c
stop_machine: remove unused variable
2008-08-12 17:52:55 +10:00
sys_ni.c
signalfd: fix undefined reference to `compat_sys_signalfd4' when !CONFIG_SIGNALFD
2008-07-25 11:35:41 -07:00
sys.c
kexec jump: remove duplication of kexec_restart_prepare()
2008-08-15 08:35:42 -07:00
sysctl_check.c
sysctl: check for bogus modes
2008-07-25 10:53:45 -07:00
sysctl.c
lost sysctl fix
2008-07-27 09:45:34 -07:00
taskstats.c
taskstats: remove initialization of static per-cpu variable
2008-07-25 10:53:47 -07:00
test_kprobes.c
…
time.c
Make constants in kernel/timeconst.h fixed 64 bits
2008-05-02 16:18:42 -07:00
timeconst.pl
Make constants in kernel/timeconst.h fixed 64 bits
2008-05-02 16:18:42 -07:00
timer.c
Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm
2008-07-14 16:06:58 -07:00
tsacct.c
task IO accounting: move all IO statistics in struct task_io_accounting
2008-07-27 16:12:28 -07:00
uid16.c
asmlinkage_protect replaces prevent_tail_call
2008-04-10 17:28:26 -07:00
user_namespace.c
eCryptfs: make key module subsystem respect namespaces
2008-04-29 08:06:07 -07:00
user.c
alloc_uid: cleanup
2008-04-30 08:29:53 -07:00
utsname_sysctl.c
…
utsname.c
kernel: explicitly include required header files under kernel/
2008-04-29 08:06:04 -07:00
wait.c
kernel: remove fastcall in kernel/*
2008-02-08 09:22:31 -08:00
workqueue.c
Merge branch 'core/locking' into core/urgent
2008-08-12 00:11:49 +02:00