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黄涛 dbc0fca461 sched: Cleanup cpu_active madness 
commit 5fbd036b55 upstream.

Stepan found:

CPU0		CPUn

_cpu_up()
  __cpu_up()

		boostrap()
		  notify_cpu_starting()
		  set_cpu_online()
		  while (!cpu_active())
		    cpu_relax()

<PREEMPT-out>

smp_call_function(.wait=1)
  /* we find cpu_online() is true */
  arch_send_call_function_ipi_mask()

  /* wait-forever-more */

<PREEMPT-in>
		  local_irq_enable()

  cpu_notify(CPU_ONLINE)
    sched_cpu_active()
      set_cpu_active()

Now the purpose of cpu_active is mostly with bringing down a cpu, where
we mark it !active to avoid the load-balancer from moving tasks to it
while we tear down the cpu. This is required because we only update the
sched_domain tree after we brought the cpu-down. And this is needed so
that some tasks can still run while we bring it down, we just don't want
new tasks to appear.

On cpu-up however the sched_domain tree doesn't yet include the new cpu,
so its invisible to the load-balancer, regardless of the active state.
So instead of setting the active state after we boot the new cpu (and
consequently having to wait for it before enabling interrupts) set the
cpu active before we set it online and avoid the whole mess.
2012-07-12 09:49:51 +08:00
..
debug Fix common misspellings 2011-03-31 11:26:23 -03:00
events perf: Fix software event overflow 2011-08-04 21:58:35 -07:00
gcov Revert "Merge remote branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:24:52 +08:00
irq revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
power rk: earlysuspend: only works on system is running 2012-05-31 09:43:26 +08:00
time Fix "time: Catch invalid timespec sleep values in __timekeeping_inject_sleeptime" to compile on 3.0 2011-11-22 16:49:43 -08:00
trace revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
.gitignore
acct.c Revert "Merge commit 'v2.6.32.9' into android-2.6.32" 2011-07-30 22:24:29 +08:00
async.c
audit.c netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms 2011-03-03 10:55:40 -08:00
audit.h audit: make functions static 2010-10-30 01:42:19 -04:00
audit_tree.c Revert "Merge commit 'v2.6.32.9' into android-2.6.32" 2011-07-30 22:24:29 +08:00
audit_watch.c kill path_lookup() 2011-03-14 09:15:23 -04:00
auditfilter.c netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms 2011-03-03 10:55:40 -08:00
auditsc.c audit: acquire creds selectively to reduce atomic op overhead 2011-04-27 15:11:03 +02:00
backtracetest.c
bounds.c memcg: remove direct page_cgroup-to-page pointer 2011-03-23 19:46:28 -07:00
capability.c Revert "Merge remote-tracking branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:09:59 +08:00
cgroup.c revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
cgroup_freezer.c revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
compat.c Revert "Merge remote branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:24:52 +08:00
configs.c
cpu.c Revert "Merge commit 'v2.6.32.9' into android-2.6.32" 2011-07-30 22:24:29 +08:00
cpu_pm.c cpu_pm: call notifiers during suspend 2012-02-22 14:09:44 +08:00
cpuset.c revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
crash_dump.c crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn 2011-03-23 19:47:19 -07:00
cred.c Revert "Merge commit 'v2.6.32.9' into android-2.6.32" 2011-07-30 22:24:29 +08:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
extable.c extable, core_kernel_data(): Make sure all archs define _sdata 2011-05-20 08:56:56 +02:00
fork.c revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
freezer.c Freezer: Use SMP barriers 2011-05-17 23:19:17 +02:00
futex.c revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
futex_compat.c userns: user namespaces: convert several capable() calls 2011-03-23 19:47:08 -07:00
groups.c Revert "Merge remote branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:24:52 +08:00
hrtimer.c Revert "Merge remote branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:24:52 +08:00
hung_task.c watchdog, hung_task_timeout: Add Kconfig configurable default 2011-04-28 09:13:17 +02:00
irq_work.c irq_work: Use per cpu atomics instead of regular atomics 2010-12-18 15:54:48 +01:00
itimer.c
jump_label.c jump_label: Fix jump_label update for modules 2011-06-29 09:59:17 -04:00
kallsyms.c Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2011-03-25 17:52:22 -07:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks arch:Kconfig.locks Remove unused config option. 2011-04-10 17:01:05 +02:00
Kconfig.preempt
kexec.c PM: Remove sysdev suspend, resume and shutdown operations 2011-05-11 21:37:15 +02:00
kfifo.c
kmod.c KEYS/DNS: Fix ____call_usermodehelper() to not lose the session keyring 2011-06-17 09:40:48 -07:00
kprobes.c Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2011-01-07 17:02:58 -08:00
ksysfs.c Revert "Merge remote-tracking branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:09:59 +08:00
kthread.c Revert "Merge remote branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:24:52 +08:00
latencytop.c revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
lockdep.c Revert "Merge remote-tracking branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:01:15 +08:00
lockdep_internals.h
lockdep_proc.c lockdep: Remove unused 'factor' variable from lockdep_stats_show() 2011-03-23 13:54:47 +01:00
lockdep_states.h
Makefile cpu_pm: Add cpu power management notifiers 2012-02-22 14:09:44 +08:00
module.c rk: module.c: enable debug locks for rk plat 2012-03-26 14:39:56 +08:00
mutex-debug.c mutex: Use p->on_cpu for the adaptive spin 2011-04-14 08:52:33 +02:00
mutex-debug.h mutex: Use p->on_cpu for the adaptive spin 2011-04-14 08:52:33 +02:00
mutex.c Revert "Merge remote branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:24:52 +08:00
mutex.h mutex: Use p->on_cpu for the adaptive spin 2011-04-14 08:52:33 +02:00
notifier.c
nsproxy.c cgroup: remove the ns_cgroup 2011-05-26 17:12:34 -07:00
padata.c Fix common misspellings 2011-03-31 11:26:23 -03:00
panic.c revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
params.c params.c: Use new strtobool function to process boolean inputs 2011-05-19 16:55:28 +09:30
pid.c Revert "Merge remote-tracking branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:09:59 +08:00
pid_namespace.c pidns: call pid_ns_prepare_proc() from create_pid_namespace() 2011-03-23 19:46:58 -07:00
pm_qos_params.c revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
posix-cpu-timers.c cputimer: Cure lock inversion 2011-10-25 07:10:14 +02:00
posix-timers.c Revert "Merge remote branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:24:52 +08:00
printk.c Merge remote-tracking branch 'remotes/aosp/android-3.0' into develop-3.0 2011-11-09 13:06:28 +08:00
profile.c Revert "Merge remote branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:24:52 +08:00
ptrace.c Revert "Merge remote-tracking branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:09:59 +08:00
range.c kernel/range.c: fix clean_sort_range() for the case of full array 2010-11-12 07:55:31 -08:00
rcupdate.c rcu: Use WARN_ON_ONCE for DEBUG_OBJECTS_RCU_HEAD warnings 2011-05-05 23:16:57 -07:00
rcutiny.c sanitize <linux/prefetch.h> usage 2011-05-20 12:50:29 -07:00
rcutiny_plugin.h rcu: Converge TINY_RCU expedited and normal boosting 2011-05-05 23:16:58 -07:00
rcutorture.c rcu: mark rcutorture boosting callback as being on-stack 2011-05-05 23:16:57 -07:00
rcutree.c Revert "Merge commit 'v2.6.32.9' into android-2.6.32" 2011-07-30 22:24:29 +08:00
rcutree.h Revert "Merge commit 'v2.6.32.9' into android-2.6.32" 2011-07-30 22:24:29 +08:00
rcutree_plugin.h Revert "Merge commit 'v2.6.32.9' into android-2.6.32" 2011-07-30 22:24:29 +08:00
rcutree_trace.c rcu: use softirq instead of kthreads except when RCU_BOOST=y 2011-06-15 23:07:21 -07:00
relay.c Clean up relay_alloc_page_array() slightly by using vzalloc rather than vmalloc and memset 2010-11-05 08:21:34 -07:00
res_counter.c memcg: res_counter_read_u64(): fix potential races on 32-bit machines 2011-03-23 19:46:22 -07:00
resource.c resource: ability to resize an allocated resource 2011-07-06 10:54:08 -07:00
rtmutex-debug.c rtmutex: Simplify PI algorithm and make highest prio task get lock 2011-01-27 21:13:51 -05:00
rtmutex-debug.h
rtmutex-tester.c rtmutex: tester: Remove the remaining BKL leftovers 2011-02-22 22:07:22 +01:00
rtmutex.c plist: Remove the need to supply locks to plist heads 2011-07-08 14:15:44 -07:00
rtmutex.h
rtmutex_common.h rtmutex: Simplify PI algorithm and make highest prio task get lock 2011-01-27 21:13:51 -05:00
rwsem.c
sched.c sched: Cleanup cpu_active madness 2012-07-12 09:49:51 +08:00
sched_autogroup.c Fix common misspellings 2011-03-31 11:26:23 -03:00
sched_autogroup.h sched, autogroup: Stop going ahead if autogroup is disabled 2011-02-23 11:33:59 +01:00
sched_clock.c Revert "Merge commit 'v2.6.32.9' into android-2.6.32" 2011-07-30 22:24:29 +08:00
sched_cpupri.c
sched_cpupri.h
sched_debug.c Revert "Merge commit 'v2.6.32.9' into android-2.6.32" 2011-07-30 22:24:29 +08:00
sched_fair.c revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
sched_features.h Revert "Merge remote-tracking branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:09:59 +08:00
sched_idletask.c Revert "Merge remote branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:24:52 +08:00
sched_rt.c sched/rt: Migrate equal priority tasks to available CPUs 2011-10-16 14:14:51 -07:00
sched_stats.h sched: More sched_domain iterations fixes 2011-05-28 17:02:54 +02:00
sched_stoptask.c sched: Drop the rq argument to sched_class::select_task_rq() 2011-04-14 08:52:36 +02:00
seccomp.c
semaphore.c
signal.c Revert "Merge commit 'v2.6.32.9' into android-2.6.32" 2011-07-30 22:24:29 +08:00
smp.c Revert "Merge remote-tracking branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:09:59 +08:00
softirq.c Revert "Merge remote-tracking branch 'linux-2.6.32.y/master' into develop" 2011-07-30 16:09:59 +08:00
spinlock.c
srcu.c rcu: demote SRCU_SYNCHRONIZE_DELAY from kernel-parameter status 2011-01-14 04:56:49 -08:00
stacktrace.c
stop_machine.c x86, mtrr: lock stop machine during MTRR rendezvous sequence 2011-08-29 13:29:08 -07:00
sys.c Merge remote-tracking branch 'remotes/aosp/android-3.0' into develop-3.0 2011-11-09 13:06:28 +08:00
sys_ni.c ipc: Add missing sys_ni entries for ipc/compat.c functions 2011-05-20 13:53:02 -07:00
sysctl.c revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
sysctl_binary.c open-style analog of vfs_path_lookup() 2011-03-14 09:15:28 -04:00
sysctl_check.c Revert "Merge commit 'v2.6.32.9' into android-2.6.32" 2011-07-30 22:24:29 +08:00
taskstats.c taskstats: don't allow duplicate entries in listener mode 2011-06-27 18:00:13 -07:00
test_kprobes.c
time.c Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2011-03-15 18:53:35 -07:00
timeconst.pl
timer.c revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
tracepoint.c jump label: Introduce static_branch() interface 2011-04-04 12:48:08 -04:00
tsacct.c taskstats: use real microsecond granularity for CPU times 2010-10-27 18:03:17 -07:00
uid16.c userns: user namespaces: convert several capable() calls 2011-03-23 19:47:08 -07:00
up.c
user-return-notifier.c Fix common misspellings 2011-03-31 11:26:23 -03:00
user.c revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
user_namespace.c user_ns: improve the user_ns on-the-slab packaging 2011-01-13 08:03:18 -08:00
utsname.c ns proc: Add support for the uts namespace 2011-05-10 14:35:35 -07:00
utsname_sysctl.c
wait.c Fix common misspellings 2011-03-31 11:26:23 -03:00
watchdog.c revert android-tegra-2.6.36-honeycomb-mr1-9001adc to v2.6.36 2011-10-28 16:02:47 +08:00
workqueue.c workqueue: lock cwq access in drain_workqueue 2011-10-03 11:40:31 -07:00
workqueue_sched.h