Peter Zijlstra 96645678cd lockstat: measure lock bouncing ...

__acquire
        |
       lock _____
        |        \
        |    __contended
        |         |
        |        wait
        | _______/
        |/
        |
   __acquired
        |
   __release
        |
     unlock

We measure acquisition and contention bouncing.

This is done by recording a cpu stamp in each lock instance.

Contention bouncing requires the cpu stamp to be set on acquisition. Hence we
move __acquired into the generic path.

__acquired is then used to measure acquisition bouncing by comparing the
current cpu with the old stamp before replacing it.

__contended is used to measure contention bouncing (only useful for preemptable
locks)

[[email protected]: cleanups]
Signed-off-by: Peter Zijlstra <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

2007-07-19 10:04:49 -07:00

..

irq

Improve behaviour of spurious IRQ detect

2007-07-16 09:05:46 -07:00

power

PM: Integrate beeping flag with existing acpi_sleep flags

2007-07-19 10:04:43 -07:00

time

kallsyms: make KSYM_NAME_LEN include space for trailing '\0'

2007-07-17 10:23:03 -07:00

.gitignore

…

acct.c

…

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

kernel/auditfilter: kill bogus uninit'd-var compiler warning

2007-07-17 16:17:59 -04:00

auditsc.c

mm: variable length argument support

2007-07-19 10:04:45 -07:00

capability.c

…

compat.c

…

configs.c

…

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

…

die_notifier.c

…

dma.c

…

exec_domain.c

…

exit.c

Freezer: avoid freezing kernel threads prematurely

2007-07-19 10:04:42 -07:00

extable.c

…

fork.c

coredump masking: add an interface for core dump filter

2007-07-19 10:04:47 -07:00

futex_compat.c

…

futex.c

mm: fault feedback #2

2007-07-19 10:04:41 -07:00

hrtimer.c

[HRTIMER] Fix cpu pointer arg to clockevents_notify()

2007-07-16 17:29:56 -07:00

itimer.c

…

kallsyms.c

kallsyms: make KSYM_NAME_LEN include space for trailing '\0'

2007-07-17 10:23:03 -07:00

Kconfig.hz

…

Kconfig.preempt

…

kexec.c

…

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

Add /sys/kernel/notes

2007-07-19 10:04:47 -07:00

kthread.c

mm: fix improper .init-type section references

2007-07-16 09:05:36 -07:00

latency.c

…

lockdep_internals.h

…

lockdep_proc.c

lockstat: measure lock bouncing

2007-07-19 10:04:49 -07:00

lockdep.c

lockstat: measure lock bouncing

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

…

mutex-debug.h

…

mutex.c

lockstat: measure lock bouncing

2007-07-19 10:04:49 -07:00

mutex.h

…

nsproxy.c

namespace: ensure clone_flags are always stored in an unsigned long

2007-07-16 09:05:48 -07:00

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

…

posix-timers.c

…

printk.c

kernel/printk.c: document possible deadlock against scheduler

2007-07-16 09:05:52 -07:00

profile.c

…

ptrace.c

coredump masking: reimplementation of dumpable using two flags

2007-07-19 10:04:46 -07:00

rcupdate.c

…

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

…

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

…

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

…

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_idletask.c

…

sched_rt.c

…

sched_stats.h

…

sched.c

use the new percpu interface for shared data

2007-07-19 10:04:45 -07:00

seccomp.c

make seccomp zerocost in schedule

2007-07-16 09:05:50 -07:00

signal.c

vdso: print fatal signals

2007-07-16 09:05:43 -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

…

stacktrace.c

…

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

lockstat: core infrastructure

2007-07-19 10:04:49 -07:00

taskstats.c

taskstats: add context-switch counters

2007-07-16 09:05:46 -07:00

time.c

sys_time() speedup

2007-07-16 09:05:48 -07:00

timer.c

Slab allocators: Replace explicit zeroing with __GFP_ZERO

2007-07-17 10:23:02 -07:00

tsacct.c

…

uid16.c

…

user_namespace.c

fix create_new_namespaces() return value

2007-07-16 09:05:47 -07:00

user.c

user namespace: add the framework

2007-07-16 09:05:47 -07:00

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

…

workqueue.c

destroy_workqueue() can livelock

2007-07-17 10:23:03 -07:00