Max Krasnyansky e761b77252 cpu hotplug, sched: Introduce cpu_active_map and redo sched domain managment (take 2) ... This is based on Linus' idea of creating cpu_active_map that prevents scheduler load balancer from migrating tasks to the cpu that is going down. It allows us to simplify domain management code and avoid unecessary domain rebuilds during cpu hotplug event handling. Please ignore the cpusets part for now. It needs some more work in order to avoid crazy lock nesting. Although I did simplfy and unify domain reinitialization logic. We now simply call partition_sched_domains() in all the cases. This means that we're using exact same code paths as in cpusets case and hence the test below cover cpusets too. Cpuset changes to make rebuild_sched_domains() callable from various contexts are in the separate patch (right next after this one). This not only boots but also easily handles while true; do make clean; make -j 8; done and while true; do on-off-cpu 1; done at the same time. (on-off-cpu 1 simple does echo 0/1 > /sys/.../cpu1/online thing). Suprisingly the box (dual-core Core2) is quite usable. In fact I'm typing this on right now in gnome-terminal and things are moving just fine. Also this is running with most of the debug features enabled (lockdep, mutex, etc) no BUG_ONs or lockdep complaints so far. I believe I addressed all of the Dmitry's comments for original Linus' version. I changed both fair and rt balancer to mask out non-active cpus. And replaced cpu_is_offline() with !cpu_active() in the main scheduler code where it made sense (to me). Signed-off-by: Max Krasnyanskiy <maxk@qualcomm.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Gregory Haskins <ghaskins@novell.com> Cc: dmitry.adamushko@gmail.com Cc: pj@sgi.com Signed-off-by: Ingo Molnar <mingo@elte.hu>		2008-07-18 13:22:25 +02:00
..
irq	genirq: remove extraneous checks in manage.c	2008-07-10 07:01:13 +02:00
power	Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6	2008-07-16 17:25:46 -07:00
time	Merge branch 'generic-ipi' into generic-ipi-for-linus	2008-07-15 21:55:59 +02:00
trace	Merge branch 'tracing/ftrace' into auto-ftrace-next	2008-07-14 15:58:35 +02:00
.gitignore	Update kernel/.gitignore with new auto-generated files	2008-02-09 23:27:01 -08:00
acct.c	bsd_acct: using task_struct->tgid is not right in pid-namespaces	2008-03-24 19:22:20 -07:00
audit.c	[PATCH] remove useless argument type in audit_filter_user()	2008-06-24 23:36:35 -04:00
audit.h	[PATCH 1/2] audit: move extern declarations to audit.h	2008-04-28 06:28:04 -04:00
audit_tree.c	[PATCH] list_for_each_rcu must die: audit	2008-05-17 03:30:23 -04:00
auditfilter.c	[PATCH] remove useless argument type in audit_filter_user()	2008-06-24 23:36:35 -04:00
auditsc.c	[PATCH] new predicate - AUDIT_FILETYPE	2008-04-28 06:28:37 -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: filesystem capabilities: fix fragile setuid fixup code	2008-07-04 10:40:08 -07:00
cgroup.c	cgroups: remove node_ prefix_from ns subsystem	2008-05-24 09:56:14 -07:00
cgroup_debug.c	CGroup API files: move "releasable" to cgroup_debug subsystem	2008-04-29 08:06:09 -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, sched: Introduce cpu_active_map and redo sched domain managment (take 2)	2008-07-18 13:22:25 +02:00
cpuset.c	cpu hotplug, sched: Introduce cpu_active_map and redo sched domain managment (take 2)	2008-07-18 13:22:25 +02:00
delayacct.c
dma.c	kernel: use non-racy method for proc entries creation	2008-04-29 08:06:22 -07:00
exec_domain.c
exit.c	fix dangling zombie when new parent ignores children	2008-07-16 18:02:34 -07:00
extable.c	module: Don't report discarded init pages as kernel text.	2008-01-29 17:13:18 +11:00
fork.c	ptrace children revamp	2008-07-16 18:02:33 -07:00
futex.c	futexes: fix fault handling in futex_lock_pi	2008-06-23 13:31:15 +02:00
futex_compat.c	futex_compat __user annotation	2008-03-30 14:18:41 -07:00
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	kernel: use non-racy method for proc entries creation	2008-04-29 08:06:22 -07:00
Kconfig.hz
Kconfig.preempt	rcu: move PREEMPT_RCU config option back under PREEMPT	2008-03-10 18:01:20 -07:00
kexec.c	kexec: make extended crashkernel= syntax less confusing	2008-05-01 08:04:00 -07:00
kfifo.c
kgdb.c	kgdb: sparse fix	2008-06-24 10:52:55 -05:00
kmod.c	[PATCH] split linux/file.h	2008-05-01 13:08:16 -04:00
kprobes.c	kernel/kprobes.c: Made kprobe_blacklist static.	2008-07-10 10:13:51 -07:00
ksysfs.c
kthread.c	Freezer: Introduce PF_FREEZER_NOSIG	2008-07-16 23:27:03 +02:00
latencytop.c	kernel: use non-racy method for proc entries creation	2008-04-29 08:06:22 -07:00
lockdep.c	Merge branch 'core/locking' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2008-07-14 14:55:13 -07:00
lockdep_internals.h	lockdep: add lock_class information to lock_chain and output it	2008-06-24 01:28:20 +02:00
lockdep_proc.c	lockdep: add lock_class information to lock_chain and output it	2008-06-24 01:28:20 +02:00
Makefile	Revert parts of "ftrace: do not trace scheduler functions"	2008-07-18 08:59:24 +02:00
marker.c	Markers - remove extra format argument	2008-05-23 22:25:27 +02:00
module.c	modules: proper cleanup of kobject without CONFIG_SYSFS	2008-05-23 13:09:33 +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	__mutex_lock_common: use signal_pending_state()	2008-06-10 11:45:09 +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	cgroups: kernel/ns_cgroup.c should #include <linux/nsproxy.h>	2008-04-29 08:06:07 -07:00
nsproxy.c	ipc: sysvsem: refuse clone(CLONE_SYSVSEM|CLONE_NEWIPC)	2008-04-29 08:06:14 -07:00
panic.c	Taint kernel after WARN_ON(condition)	2008-04-29 08:05:59 -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.c	rcu: split list.h and move rcu-protected lists into rculist.h	2008-05-19 10:01:37 +02:00
pid_namespace.c	pidns: make pid->level and pid_ns->level unsigned	2008-04-30 08:29:49 -07:00
pm_qos_params.c	pm_qos_params: BKL pushdown	2008-07-02 15:06:24 -06:00
posix-cpu-timers.c	posix-timers: print RT watchdog message	2008-05-24 18:49:22 +02:00
posix-timers.c	signals: join send_sigqueue() with send_group_sigqueue()	2008-04-30 08:29:36 -07:00
printk.c	Merge branch 'core/printk' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2008-07-14 15:27:43 -07:00
profile.c	on_each_cpu(): kill unused 'retry' parameter	2008-06-26 11:24:38 +02:00
ptrace.c	ptrace children revamp	2008-07-16 18:02:33 -07:00
rcuclassic.c	Merge branch 'core/rcu' into core/rcu-for-linus	2008-07-15 21:10:12 +02:00
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.c	Merge branch 'core/rcu' into core/rcu-for-linus	2008-07-15 21:10:12 +02:00
rcupreempt_trace.c	rcu: remove duplicated include in kernel/rcupreempt_trace.c	2008-05-19 10:03:39 +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	splice: fix sendfile() issue with relay	2008-05-28 14:49:27 +02:00
res_counter.c	memcgroup: add the max_usage member on the res_counter	2008-04-29 08:06:10 -07:00
resource.c	kernel: use non-racy method for proc entries creation	2008-04-29 08:06:22 -07:00
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
rtmutex.c	hrtimer: more hrtimer_init_sleeper() fallout.	2008-02-13 15:45:36 +01:00
rtmutex.h
rtmutex_common.h	Don't operate with pid_t in rtmutex tester	2008-02-08 09:22:41 -08:00
rwsem.c
sched.c	cpu hotplug, sched: Introduce cpu_active_map and redo sched domain managment (take 2)	2008-07-18 13:22:25 +02:00
sched_clock.c	Merge branch 'sched/clock' into sched/devel	2008-07-14 12:19:13 +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	cpu hotplug, sched: Introduce cpu_active_map and redo sched domain managment (take 2)	2008-07-18 13:22:25 +02:00
sched_features.h	sched: bias effective_load() error towards failing wake_affine().	2008-06-27 14:31:47 +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	cpu hotplug, sched: Introduce cpu_active_map and redo sched domain managment (take 2)	2008-07-18 13:22:25 +02:00
sched_stats.h	sched: fix accounting in task delay accounting & migration	2008-07-04 12:50:23 +02:00
seccomp.c
semaphore.c	mmiotrace broken in linux-next (8-bit writes only)	2008-07-01 10:14:06 +02:00
signal.c	posix timers: discard SI_TIMER signals on exec	2008-05-26 10:37:07 -07:00
smp.c	generic ipi function calls: wait on alloc failure fallback	2008-07-15 14:12:20 -07:00
softirq.c	Merge branch 'generic-ipi' into generic-ipi-for-linus	2008-07-15 21:55:59 +02:00
softlockup.c	softlockup: print a module list on being stuck	2008-07-05 08:51:24 +02:00
spinlock.c	ftrace: lockdep notrace annotations	2008-05-23 20:39:40 +02:00
srcu.c	make srcu_readers_active() static	2008-02-06 10:41:02 -08:00
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	sched: add new API sched_setscheduler_nocheck: add a flag to control access checks	2008-06-23 22:57:56 +02:00
sys.c	sys_prctl(): fix return of uninitialized value	2008-05-24 09:56:13 -07:00
sys_ni.c	timerfd: new timerfd API	2008-02-05 09:44:07 -08:00
sysctl.c	Merge branch 'core/rcu' into core/rcu-for-linus	2008-07-15 21:10:12 +02:00
sysctl_check.c	constify tables in kernel/sysctl_check.c	2008-02-08 09:22:31 -08:00
taskstats.c	Use find_task_by_vpid in taskstats	2008-04-30 08:29:48 -07:00
test_kprobes.c	kprobes: kretprobe user entry-handler	2008-02-06 10:41:11 -08:00
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
uid16.c	asmlinkage_protect replaces prevent_tail_call	2008-04-10 17:28:26 -07:00
user.c	alloc_uid: cleanup	2008-04-30 08:29:53 -07:00
user_namespace.c	eCryptfs: make key module subsystem respect namespaces	2008-04-29 08:06:07 -07:00
utsname.c	kernel: explicitly include required header files under kernel/	2008-04-29 08:06:04 -07:00
utsname_sysctl.c
wait.c	kernel: remove fastcall in kernel/*	2008-02-08 09:22:31 -08:00
workqueue.c	Christoph has moved	2008-07-04 10:40:04 -07:00