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ffda12a17a
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Peter Zijlstra ffda12a17a sched: optimize group load balancer 
I noticed that tg_shares_up() unconditionally takes rq-locks for all cpus
in the sched_domain. This hurts.

We need the rq-locks whenever we change the weight of the per-cpu group sched
entities. To allevate this a little, only change the weight when the new
weight is at least shares_thresh away from the old value.

This avoids the rq-lock for the top level entries, since those will never
be re-weighted, and fuzzes the lower level entries a little to gain performance
in semi-stable situations.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-20 14:05:02 +02:00
..
irq
power pm: rework disabling of user mode helpers during suspend/hibernation 2008-10-16 11:21:29 -07:00
time Merge branch 'core-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-10-16 15:17:40 -07:00
trace hrtimer: prevent migration of per CPU hrtimers 2008-09-29 17:09:14 +02:00
.gitignore
acct.c tty: Fix abusers of current->sighand->tty 2008-10-13 09:51:42 -07:00
audit_tree.c
audit.c
audit.h
auditfilter.c
auditsc.c tty: Fix abusers of current->sighand->tty 2008-10-13 09:51:42 -07:00
backtracetest.c
bounds.c
capability.c
cgroup_debug.c
cgroup.c memrlimit: cgroup mm owner callback changes to add task info 2008-10-16 11:21:28 -07:00
compat.c compat: generic compat get/settimeofday 2008-10-16 11:21:33 -07:00
configs.c
cpu.c Merge branches 'sched/devel', 'sched/cpu-hotplug', 'sched/cpusets' and 'sched/urgent' into sched/core 2008-10-08 11:31:02 +02:00
cpuset.c cpusets: scan_for_empty_cpusets(), cpuset doesn't seem to be so const 2008-10-03 13:39:50 +02:00
delayacct.c
dma-coherent.c
dma.c kernel/dma.c: remove a CVS keyword 2008-10-16 11:21:30 -07:00
exec_domain.c
exit.c memrlimit: cgroup mm owner callback changes to add task info 2008-10-16 11:21:28 -07:00
extable.c
fork.c tty: Add a kref count 2008-10-13 09:51:40 -07:00
futex_compat.c
futex.c
hrtimer.c hrtimer: prevent migration of per CPU hrtimers 2008-09-29 17:09:14 +02:00
itimer.c
kallsyms.c kernel/kallsyms.c: fix double return 2008-10-16 11:21:32 -07:00
Kconfig.hz
Kconfig.preempt
kexec.c kexec: fix segmentation fault in kimage_add_entry 2008-09-23 08:09:14 -07:00
kfifo.c
kgdb.c kgdb: call touch_softlockup_watchdog on resume 2008-10-06 13:50:59 -05:00
kmod.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus 2008-10-16 12:38:34 -07:00
kprobes.c make kprobes.c:kretprobe_table_lock() static 2008-10-16 11:21:52 -07:00
ksysfs.c profiling: dynamically enable readprofile at runtime 2008-10-16 11:21:31 -07:00
kthread.c
latencytop.c
lockdep_internals.h
lockdep_proc.c
lockdep.c
Makefile
marker.c
module.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2008-10-16 12:40:26 -07:00
mutex-debug.c
mutex-debug.h
mutex.c
mutex.h
notifier.c
ns_cgroup.c
nsproxy.c
panic.c taint: fix kernel-doc 2008-10-16 11:21:32 -07:00
params.c
pid_namespace.c
pid.c
pm_qos_params.c
posix-cpu-timers.c
posix-timers.c fix error-path NULL deref in alloc_posix_timer() 2008-10-02 15:53:13 -07:00
printk.c Merge branch 'core-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-10-16 15:17:40 -07:00
profile.c profiling: dynamically enable readprofile at runtime 2008-10-16 11:21:31 -07:00
ptrace.c
rcuclassic.c rcu: RCU-based detection of stalled CPUs for Classic RCU, fix 2008-10-03 10:41:00 +02:00
rcupdate.c
rcupreempt_trace.c
rcupreempt.c
rcutorture.c
relay.c
res_counter.c
resource.c Merge branch 'core-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-10-16 15:17:40 -07:00
rtmutex_common.h
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rwsem.c
sched_clock.c sched_clock: prevent scd->clock from moving backwards 2008-10-10 11:17:04 +02:00
sched_cpupri.c
sched_cpupri.h
sched_debug.c [PATCH] signal, procfs: some lock_task_sighand() users do not need rcu_read_lock() 2008-10-10 04:18:57 +04:00
sched_fair.c sched: minor fast-path overhead reduction 2008-10-17 15:36:58 +02:00
sched_features.h
sched_idletask.c
sched_rt.c sched_rt.c: resch needed in rt_rq_enqueue() for the root rt_rq 2008-10-04 14:31:54 +02:00
sched_stats.h sched: fix the wrong mask_len, cleanup 2008-10-17 13:05:22 +02:00
sched.c sched: optimize group load balancer 2008-10-20 14:05:02 +02:00
seccomp.c
semaphore.c
signal.c
smp.c
softirq.c Fix kernel/softirq.c printk format warning properly 2008-10-16 15:32:46 -07:00
softlockup.c Make the taint flags reliable 2008-10-16 11:21:31 -07:00
spinlock.c
srcu.c
stacktrace.c
stop_machine.c
sys_ni.c Configure out AIO support 2008-10-16 11:21:51 -07:00
sys.c kernel/sys.c: improve code generation 2008-10-16 11:21:31 -07:00
sysctl_check.c
sysctl.c sched: optimize group load balancer 2008-10-20 14:05:02 +02:00
taskstats.c
test_kprobes.c
time.c
timeconst.pl
timer.c
tsacct.c
uid16.c
user_namespace.c
user.c
utsname_sysctl.c sysctl: simplify ->strategy 2008-10-16 11:21:47 -07:00
utsname.c
wait.c wait: kill is_sync_wait() 2008-10-16 11:21:31 -07:00
workqueue.c Remove Andrew Morton's old email accounts 2008-10-16 11:21:32 -07:00