Peter Zijlstra 92f22a3865 perf_counter: update mmap() counter read ... Paul noted that we don't need SMP barriers for the mmap() counter read because its always on the same cpu (otherwise you can't access the hw counter anyway). So remove the SMP barriers and replace them with regular compiler barriers. Further, update the comment to include a race free method of reading said hardware counter. The primary change is putting the pmc_read inside the seq-loop, otherwise we can still race and read rubbish. Noticed-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Orig-LKML-Reference: <20090402091319.577951445@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2009-04-06 09:30:47 +02:00
..
irq	Merge branch 'tracing/core-v2' into tracing-for-linus	2009-04-02 00:49:02 +02:00
power	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-04-03 15:24:35 -07:00
time	Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-03-26 16:05:42 -07:00
trace	Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-04-05 11:04:19 -07:00
.gitignore
acct.c
async.c	async: remove the temporary (2.6.29) "async is off by default" code	2009-03-28 13:05:30 -07:00
audit_tree.c	audit: incorrect ref counting in audit tree tag_chunk	2009-04-05 13:48:26 -04:00
audit.c	Audit: remove spaces from audit_log_d_path	2009-04-05 13:49:04 -04:00
audit.h
auditfilter.c	make the e->rule.xxx shorter in kernel auditfilter.c	2009-04-05 13:40:33 -04:00
auditsc.c	Audit: remove spaces from audit_log_d_path	2009-04-05 13:49:04 -04:00
backtracetest.c
bounds.c
capability.c
cgroup_debug.c	debug cgroup: remove unneeded cgroup_lock	2009-04-02 19:04:54 -07:00
cgroup_freezer.c
cgroup.c	memcg: fix OOM killer under memcg	2009-04-02 19:04:55 -07:00
compat.c
configs.c
cpu.c	cpumask: use set_cpu_active in init/main.c	2009-03-30 22:05:12 +10:30
cpuset.c	cpusets: prevent PF_THREAD_BOUND tasks from attaching to non-root cpusets	2009-04-02 19:04:57 -07:00
cred-internals.h
cred.c
delayacct.c
dma-coherent.c
dma.c
exec_domain.c	Get rid of indirect include of fs_struct.h	2009-03-31 23:00:27 -04:00
exit.c	Merge branch 'linus' into perfcounters/core-v2	2009-04-06 09:02:57 +02:00
extable.c	Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-04-05 11:04:19 -07:00
fork.c	Merge branch 'linus' into perfcounters/core-v2	2009-04-06 09:02:57 +02:00
freezer.c
futex_compat.c
futex.c	futex: remove the pointer math from double_unlock_hb, fix	2009-03-13 10:32:07 +01:00
hrtimer.c
itimer.c
kallsyms.c	Ksplice: Add functions for walking kallsyms symbols	2009-03-31 13:05:32 +10:30
Kconfig.freezer
Kconfig.hz
Kconfig.preempt
kexec.c	kexec: vmcoreinfo_data[] can become static	2009-04-02 19:05:04 -07:00
kfifo.c
kgdb.c
kmod.c	module: create a request_module_nowait()	2009-03-31 13:05:35 +10:30
kprobes.c	kprobes: Fix locking imbalance in kretprobes	2009-03-18 12:51:16 +01:00
ksysfs.c
kthread.c	cpumask: remove dangerous CPU_MASK_ALL_PTR, &CPU_MASK_ALL	2009-03-30 22:05:11 +10:30
latencytop.c	sched, latencytop: incorporate review feedback from Andrew Morton	2009-02-11 10:18:04 +01:00
lockdep_internals.h	lockdep: get_user_chars() redo	2009-02-14 23:28:22 +01:00
lockdep_proc.c	lockstat: warn about disabled lock debugging	2009-02-14 23:28:28 +01:00
lockdep_states.h	lockdep: move state bit definitions around	2009-02-14 23:27:59 +01:00
lockdep.c	Merge branch 'tracing/core-v2' into tracing-for-linus	2009-04-02 00:49:02 +02:00
Makefile	Merge branch 'linus' into perfcounters/core-v2	2009-04-06 09:02:57 +02:00
marker.c
module.c	Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-04-05 11:04:19 -07:00
mutex-debug.c
mutex-debug.h
mutex.c	mutex: drop "inline" from mutex_lock() inside kernel/mutex.c	2009-04-06 09:30:27 +02:00
mutex.h
notifier.c
ns_cgroup.c	cgroups: relax ns_can_attach checks to allow attaching to grandchild cgroups	2009-04-02 19:04:53 -07:00
nsproxy.c
panic.c	panic: clean up kernel/panic.c	2009-03-13 11:25:53 +01:00
params.c	param: fix charp parameters set via sysfs	2009-03-31 13:05:30 +10:30
perf_counter.c	perf_counter: update mmap() counter read	2009-04-06 09:30:47 +02:00
pid_namespace.c	signals: zap_pid_ns_process() should use force_sig()	2009-04-02 19:04:58 -07:00
pid.c	pids: refactor vnr/nr_ns helpers to make them safe	2009-04-02 19:05:02 -07:00
pm_qos_params.c
posix-cpu-timers.c	posix timers: fix RLIMIT_CPU && fork()	2009-03-23 20:43:35 +01:00
posix-timers.c
printk.c	Merge branch 'printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-04-05 10:23:25 -07:00
profile.c	profiling: fix broken profiling regression	2009-02-10 00:50:37 +01:00
ptrace.c	Merge branch 'core-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-04-03 17:35:06 -07:00
rcuclassic.c	rcu: Teach RCU that idle task is not quiscent state at boot	2009-02-26 04:08:14 +01:00
rcupdate.c	rcu: rcu_barrier VS cpu_hotplug: Ensure callbacks in dead cpu are migrated to online cpu	2009-03-31 00:09:37 +02:00
rcupreempt_trace.c
rcupreempt.c	rcu: Teach RCU that idle task is not quiscent state at boot	2009-02-26 04:08:14 +01:00
rcutorture.c	cpumask: convert rcutorture.c	2009-03-30 22:05:16 +10:30
rcutree_trace.c
rcutree.c	rcu: Teach RCU that idle task is not quiscent state at boot	2009-02-26 04:08:14 +01:00
relay.c	Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-04-05 11:04:19 -07:00
res_counter.c
resource.c
rtmutex_common.h
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rwsem.c
sched_clock.c	Merge branch 'tracing/core-v2' into tracing-for-linus	2009-04-02 00:49:02 +02:00
sched_cpupri.c
sched_cpupri.h	cpumask: remove cpumask_t from core	2009-03-30 22:05:17 +10:30
sched_debug.c	sched: remove unused fields from struct rq	2009-03-24 23:16:51 +01:00
sched_fair.c	Merge branch 'sched/urgent'; commit 'v2.6.29-rc5' into sched/core	2009-02-15 21:15:16 +01:00
sched_features.h	Merge branch 'locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-03-30 17:17:35 -07:00
sched_idletask.c
sched_rt.c	Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2	2009-03-27 17:28:43 +01:00
sched_stats.h	sched: remove unused fields from struct rq	2009-03-24 23:16:51 +01:00
sched.c	perf_counter: generic context switch event	2009-04-06 09:30:15 +02:00
seccomp.c	x86-64: seccomp: fix 32/64 syscall hole	2009-03-02 15:41:30 -08:00
semaphore.c
signal.c	signals: SI_USER: Masquerade si_pid when crossing pid ns boundary	2009-04-02 19:04:58 -07:00
slow-work.c	Document the slow work thread pool	2009-04-03 16:42:35 +01:00
smp.c	generic-ipi: eliminate WARN_ON()s during oops/panic	2009-03-13 10:47:34 +01:00
softirq.c	Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-04-05 11:04:19 -07:00
softlockup.c
spinlock.c	Allow rwlocks to re-enable interrupts	2009-04-02 19:05:11 -07:00
srcu.c
stacktrace.c
stop_machine.c	cpumask: remove cpumask_t from core	2009-03-30 22:05:17 +10:30
sys_ni.c
sys.c	Merge branch 'linus' into perfcounters/core-v2	2009-04-06 09:02:57 +02:00
sysctl_check.c
sysctl.c	Make the slow work pool configurable	2009-04-03 16:42:35 +01:00
taskstats.c
test_kprobes.c
time.c
timeconst.pl
timer.c	perf_counter: unify and fix delayed counter wakeup	2009-04-06 09:30:36 +02:00
tracepoint.c	tracepoints: dont update zero-sized tracepoint sections	2009-03-18 19:55:00 +01:00
tsacct.c	Fix fixpoint divide exception in acct_update_integrals	2009-03-09 08:13:35 -07:00
uid16.c
up.c
user_namespace.c	Fix recursive lock in free_uid()/free_user_ns()	2009-02-27 16:26:21 -08:00
user.c	Merge branch 'master' into next	2009-03-24 10:52:46 +11:00
utsname_sysctl.c	proc_sysctl: use CONFIG_PROC_SYSCTL around ipc and utsname proc_handlers	2009-04-02 19:05:01 -07:00
utsname.c
wait.c
workqueue.c	Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-04-05 11:04:19 -07:00