Steven Rostedt e1f47d891c sched: RT-balance, avoid overloading ... This patch changes the searching for a run queue by a waking RT task to try to pick another runqueue if the currently running task is an RT task. The reason is that RT tasks behave different than normal tasks. Preempting a normal task to run a RT task to keep its cache hot is fine, because the preempted non-RT task may wait on that same runqueue to run again unless the migration thread comes along and pulls it off. RT tasks behave differently. If one is preempted, it makes an active effort to continue to run. So by having a high priority task preempt a lower priority RT task, that lower RT task will then quickly try to run on another runqueue. This will cause that lower RT task to replace its nice hot cache (and TLB) with a completely cold one. This is for the hope that the new high priority RT task will keep its cache hot. Remeber that this high priority RT task was just woken up. So it may likely have been sleeping for several milliseconds, and will end up with a cold cache anyway. RT tasks run till they voluntarily stop, or are preempted by a higher priority task. This means that it is unlikely that the woken RT task will have a hot cache to wake up to. So pushing off a lower RT task is just killing its cache for no good reason. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2008-01-25 21:08:12 +01:00
..
irq	genirq: revert lazy irq disable for simple irqs	2007-12-18 18:05:58 +01:00
power	driver core: make /sys/power a kobject	2008-01-24 20:40:25 -08:00
time	Driver core: change sysdev classes to use dynamic kobject names	2008-01-24 20:40:40 -08:00
.gitignore
acct.c	acct: real_parent ppid	2008-01-07 14:55:37 -08:00
audit_tree.c	[PATCH] audit: watching subtrees	2007-10-21 02:37:45 -04:00
audit.c	[PATCH] audit: watching subtrees	2007-10-21 02:37:45 -04:00
audit.h	[PATCH] audit: watching subtrees	2007-10-21 02:37:45 -04:00
auditfilter.c	[PATCH] audit: watching subtrees	2007-10-21 02:37:45 -04:00
auditsc.c	auditsc: fix kernel-doc param warnings	2007-10-22 19:40:02 -07:00
capability.c	Uninline find_pid etc set of functions	2007-10-19 11:53:41 -07:00
cgroup_debug.c	Task Control Groups: simple task cgroup debug info subsystem	2007-10-19 11:53:36 -07:00
cgroup.c	Improve cgroup printks	2007-11-14 18:45:37 -08:00
compat.c	Merge ssh://master.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-hrt	2007-10-18 15:12:41 -07:00
configs.c	use simple_read_from_buffer in kernel/	2007-05-09 12:30:49 -07:00
cpu.c	cpu-hotplug: replace per-subsystem mutexes with get_online_cpus()	2008-01-25 21:08:02 +01:00
cpuset.c	cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()	2008-01-25 21:08:02 +01:00
delayacct.c	Add scaled time to taskstats based process accounting	2007-10-18 14:37:28 -07:00
dma.c	whitespace fixes: DMA channel allocator	2007-10-18 14:37:24 -07:00
exec_domain.c	whitespace fixes: execution domains	2007-10-18 14:37:26 -07:00
exit.c	wait_task_stopped(): pass correct exit_code to wait_noreap_copyout()	2007-11-29 09:24:55 -08:00
extable.c
fork.c	sched: add RT-balance cpu-weight	2008-01-25 21:08:07 +01:00
futex_compat.c	[FUTEX] Fix address computation in compat code.	2007-11-09 16:13:08 -08:00
futex.c	futex: Prevent stale futex owner when interrupted/timeout	2008-01-08 16:21:39 -08:00
hrtimer.c	hrtimer: fix section mismatch	2008-01-21 19:39:41 -08:00
itimer.c	whitespace fixes: interval timers	2007-10-18 14:37:26 -07:00
kallsyms.c	FRV: fix the extern declaration of kallsyms_num_syms	2007-11-29 09:24:54 -08:00
Kconfig.hz
Kconfig.instrumentation	Tiny clean-up of OPROFILE/KPROBES configuration	2007-12-06 09:41:12 -08:00
Kconfig.preempt	Move PREEMPT_NOTIFIERS into an always-included Kconfig	2007-10-17 08:42:55 -07:00
kexec.c	vmcoreinfo: add the array length of "free_list" for filtering free pages	2008-01-08 16:10:36 -08:00
kfifo.c	is_power_of_2: kernel/kfifo.c	2007-07-16 09:05:50 -07:00
kmod.c	Fix unbalanced helper_lock in kernel/kmod.c	2008-01-17 15:38:59 -08:00
kprobes.c	kprobes: support kretprobe blacklist	2007-10-16 09:43:10 -07:00
ksysfs.c	Kobject: convert remaining kobject_unregister() to kobject_put()	2008-01-24 20:40:40 -08:00
kthread.c	kthread: silence bogus section mismatch warning	2007-07-31 15:39:42 -07:00
latency.c
lockdep_internals.h
lockdep_proc.c	lockdep: Avoid /proc/lockdep & lock_stat infinite output	2007-10-11 22:11:11 +02:00
lockdep.c	softlockup: automatically detect hung TASK_UNINTERRUPTIBLE tasks	2008-01-25 21:08:02 +01:00
Makefile	revert "Task Control Groups: example CPU accounting subsystem"	2007-11-14 18:45:40 -08:00
marker.c	Linux Kernel Markers: fix marker mutex not taken upon module load	2007-11-14 18:45:40 -08:00
module.c	Kobject: convert remaining kobject_unregister() to kobject_put()	2008-01-24 20:40:40 -08:00
mutex-debug.c	[PATCH] remove many unneeded #includes of sched.h	2007-02-14 08:09:54 -08:00
mutex-debug.h
mutex.c	lockdep: fixup mutex annotations	2007-10-11 22:11:12 +02:00
mutex.h
notifier.c	Add kernel/notifier.c	2007-10-19 11:53:34 -07:00
ns_cgroup.c	cgroups: implement namespace tracking subsystem	2007-10-19 11:53:37 -07:00
nsproxy.c	pid namespaces: allow cloning of new namespace	2007-10-19 11:53:39 -07:00
panic.c	debug: add end-of-oops marker	2007-12-20 15:01:17 +01:00
params.c	Modules: remove unneeded release function	2008-01-24 20:40:39 -08:00
pid.c	pidns: Place under CONFIG_EXPERIMENTAL	2007-11-14 18:45:43 -08:00
posix-cpu-timers.c	Isolate some explicit usage of task->tgid	2007-10-19 11:53:40 -07:00
posix-timers.c	Isolate some explicit usage of task->tgid	2007-10-19 11:53:40 -07:00
printk.c	sched: remove printk_clock()	2008-01-25 21:07:59 +01:00
profile.c	sched: document profile=sleep requiring CONFIG_SCHEDSTATS	2007-10-24 18:23:50 +02:00
ptrace.c	ptrace: Call arch_ptrace_attach() when request=PTRACE_TRACEME	2008-01-25 08:31:39 +01:00
rcupdate.c	rcu: fix section mismatch	2008-01-22 09:17:48 -08:00
rcutorture.c	cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()	2008-01-25 21:08:02 +01:00
relay.c	whitespace fixes: relayfs	2007-10-18 14:37:24 -07:00
resource.c	Add IORESOUCE_BUSY flag for System RAM	2007-11-14 18:45:39 -08:00
rtmutex_common.h	FUTEX: Tidy up the code	2007-07-16 09:05:49 -07:00
rtmutex-debug.c	Use helpers to obtain task pid in printks	2007-10-19 11:53:43 -07:00
rtmutex-debug.h
rtmutex-tester.c	Driver core: change sysdev classes to use dynamic kobject names	2008-01-24 20:40:40 -08:00
rtmutex.c	Use helpers to obtain task pid in printks	2007-10-19 11:53:43 -07:00
rtmutex.h
rwsem.c	sched: mark rwsem functions as __sched for wchan/profiling	2007-12-18 15:21:13 +01:00
sched_debug.c	sched: fix gcc warnings	2007-12-30 17:24:35 +01:00
sched_fair.c	sched: de-SCHED_OTHER-ize the RT path	2008-01-25 21:08:09 +01:00
sched_idletask.c	sched: de-SCHED_OTHER-ize the RT path	2008-01-25 21:08:09 +01:00
sched_rt.c	sched: RT-balance, avoid overloading	2008-01-25 21:08:12 +01:00
sched_stats.h	sched: clean up kernel/sched_stat.h	2007-11-28 15:52:56 +01:00
sched.c	sched: wake-balance fixes	2008-01-25 21:08:12 +01:00
seccomp.c	make seccomp zerocost in schedule	2007-07-16 09:05:50 -07:00
signal.c	sigwait eats blocked default-ignore signals	2007-11-12 16:05:23 -08:00
softirq.c	[KERNEL]: Unexport raise_softirq_irqoff	2007-10-10 16:49:18 -07:00
softlockup.c	softlockup: automatically detect hung TASK_UNINTERRUPTIBLE tasks	2008-01-25 21:08:02 +01:00
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	cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()	2008-01-25 21:08:02 +01:00
sys_ni.c	[COMPAT]: Fix build on COMPAT platforms when CONFIG_NET is disabled.	2007-10-30 21:29:56 -07:00
sys.c	x86: ignore the sys_getcpu() tcache parameter	2007-11-17 16:27:00 +01:00
sysctl_check.c	sysctl: fix ax25 checks	2007-12-17 19:28:17 -08:00
sysctl.c	softlockup: automatically detect hung TASK_UNINTERRUPTIBLE tasks	2008-01-25 21:08:02 +01:00
taskstats.c	kernel/taskstats.c: fix bogus nlmsg_free()	2007-11-14 18:45:44 -08:00
time.c	whitespace fixes: time syscalls	2007-10-18 14:37:24 -07:00
timer.c	timer: fix section mismatch	2008-01-21 19:39:41 -08:00
tsacct.c	Add scaled time to taskstats based process accounting	2007-10-18 14:37:28 -07:00
uid16.c	header cleaning: don't include smp_lock.h when not used	2007-05-08 11:15:07 -07:00
user_namespace.c	Fix user namespace exiting OOPs	2007-09-19 11:24:18 -07:00
user.c	Kobject: convert kernel/user.c to use kobject_init/add_ng()	2008-01-24 20:40:31 -08:00
utsname_sysctl.c	Isolate the UTS namespace's domainname and hostname back	2007-11-29 09:24:53 -08:00
utsname.c	Fix UTS corruption during clone(CLONE_NEWUTS)	2007-09-19 11:24:17 -07:00
wait.c	Fix occurrences of "the the "	2007-05-09 08:57:56 +02:00
workqueue.c	cpu-hotplug: replace per-subsystem mutexes with get_online_cpus()	2008-01-25 21:08:02 +01:00