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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
Merge branch 'linus' into x86/core
2008-08-14 14:58:01 +02:00
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
Update kernel/.gitignore with new auto-generated files
2008-02-09 23:27:01 -08:00
acct.c
tty: Fix abusers of current->sighand->tty
2008-10-13 09:51:42 -07:00
audit_tree.c
[PATCH] list_for_each_rcu must die: audit
2008-05-17 03:30:23 -04:00
audit.c
[PATCH] Fix the bug of using AUDIT_STATUS_RATE_LIMIT when set fail, no error output.
2008-08-01 12:15:16 -04:00
audit.h
[PATCH 1/2] audit: move extern declarations to audit.h
2008-04-28 06:28:04 -04:00
auditfilter.c
Re: [PATCH] the loginuid field should be output in all AUDIT_CONFIG_CHANGE audit messages
2008-08-01 12:15:03 -04:00
auditsc.c
tty: Fix abusers of current->sighand->tty
2008-10-13 09:51:42 -07:00
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: Fix setting of PF_SUPERPRIV by __capable()
2008-08-14 22:59:43 +10:00
cgroup_debug.c
CGroup API files: move "releasable" to cgroup_debug subsystem
2008-04-29 08:06:09 -07:00
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
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
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
per-task-delay-accounting: update taskstats for memory reclaim delay
2008-07-25 10:53:47 -07:00
dma-coherent.c
dma-coherent: export dma_[alloc|release]_from_coherent methods
2008-08-22 08:34:53 +02:00
dma.c
kernel/dma.c: remove a CVS keyword
2008-10-16 11:21:30 -07:00
exec_domain.c
[PATCH] kill altroot
2008-07-26 20:53:20 -04:00
exit.c
memrlimit: cgroup mm owner callback changes to add task info
2008-10-16 11:21:28 -07:00
extable.c
module: Don't report discarded init pages as kernel text.
2008-01-29 17:13:18 +11:00
fork.c
tty: Add a kref count
2008-10-13 09:51:40 -07:00
futex_compat.c
futex_compat __user annotation
2008-03-30 14:18:41 -07:00
futex.c
futexes: fix fault handling in futex_lock_pi
2008-06-23 13:31:15 +02:00
hrtimer.c
hrtimer: prevent migration of per CPU hrtimers
2008-09-29 17:09:14 +02:00
itimer.c
ITIMER_REAL: convert to use struct pid
2008-02-08 09:22:29 -08:00
kallsyms.c
kernel/kallsyms.c: fix double return
2008-10-16 11:21:32 -07:00
Kconfig.hz
sched: fix SCHED_HRTICK dependency
2008-07-28 14:37:38 +02:00
Kconfig.preempt
rcu: move PREEMPT_RCU config option back under PREEMPT
2008-03-10 18:01:20 -07:00
kexec.c
kexec: fix segmentation fault in kimage_add_entry
2008-09-23 08:09:14 -07:00
kfifo.c
is_power_of_2: kernel/kfifo.c
2007-07-16 09:05:50 -07:00
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
tracehook: wait_task_inactive
2008-07-26 12:00:09 -07:00
latencytop.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
lockdep_internals.h
lockdep: build fix
2008-08-13 12:55:10 +02:00
lockdep_proc.c
lockstat: fix numerical output rounding error
2008-08-26 10:37:46 +02:00
lockdep.c
lockdep: fix invalid list_del_rcu in zap_class
2008-08-27 08:40:36 +02:00
Makefile
Merge branch 'linus' into core/generic-dma-coherent
2008-07-29 00:07:55 +02:00
marker.c
markers: fix markers read barrier for multiple probes
2008-07-30 09:41:45 -07:00
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: check mutex magic before owner
2008-05-16 16:53:35 +02:00
mutex-debug.h
…
mutex.c
locking: fix mutex @key parameter kernel-doc notation
2008-07-28 18:12:36 +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
cgroup_clone: use pid of newly created task for new cgroup
2008-07-25 10:53:37 -07:00
nsproxy.c
removed unused #include <linux/version.h>'s
2008-08-23 12:14:12 -07:00
panic.c
taint: fix kernel-doc
2008-10-16 11:21:32 -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_namespace.c
pid_ns: (BUG 11391) change ->child_reaper when init->group_leader exits
2008-09-02 19:21:38 -07:00
pid.c
pidns: remove now unused find_pid function.
2008-07-25 10:53:45 -07:00
pm_qos_params.c
pm_qos_requirement might sleep
2008-09-02 19:21:40 -07:00
posix-cpu-timers.c
posix-timers: print RT watchdog message
2008-05-24 18:49:22 +02:00
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
security: Fix setting of PF_SUPERPRIV by __capable()
2008-08-14 22:59:43 +10:00
rcuclassic.c
rcu: RCU-based detection of stalled CPUs for Classic RCU, fix
2008-10-03 10:41:00 +02:00
rcupdate.c
rcu: fix synchronize_rcu() so that kernel-doc works
2008-08-21 09:31:44 +02:00
rcupreempt_trace.c
rcu: trace fix possible mem-leak
2008-08-15 17:54:40 +02:00
rcupreempt.c
rcu: remove redundant ACCESS_ONCE definition from rcupreempt.c
2008-08-18 09:45:22 +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
relay: fix "full buffer with exactly full last subbuffer" accounting problem
2008-08-05 14:33:46 -07:00
res_counter.c
cgroup files: convert res_counter_write() to be a cgroups write_string() handler
2008-07-25 10:53:36 -07:00
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
Don't operate with pid_t in rtmutex tester
2008-02-08 09:22:41 -08:00
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
sysdev: Pass the attribute to the low level sysdev show/store function
2008-07-21 21:55:02 -07:00
rtmutex.c
hrtimer: more hrtimer_init_sleeper() fallout.
2008-02-13 15:45:36 +01:00
rtmutex.h
…
rwsem.c
sched: mark rwsem functions as __sched for wchan/profiling
2007-12-18 15:21:13 +01:00
sched_clock.c
sched_clock: prevent scd->clock from moving backwards
2008-10-10 11:17:04 +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
[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: turn off WAKEUP_OVERLAP
2008-09-22 16:29:00 +02:00
sched_idletask.c
sched: wakeup preempt when small overlap
2008-09-22 16:28:32 +02:00
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
make seccomp zerocost in schedule
2007-07-16 09:05:50 -07:00
semaphore.c
semaphore: __down_common: use signal_pending_state()
2008-08-05 14:33:47 -07:00
signal.c
tracehook: fix SA_NOCLDWAIT
2008-08-19 20:37:07 -07:00
smp.c
smp: have smp_call_function_single() detect invalid CPUs
2008-08-25 17:45:48 -07:00
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
lockdep: spin_lock_nest_lock(), checkpatch fixes
2008-08-13 13:56:51 +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
stop_machine: remove unused variable
2008-08-12 17:52:55 +10:00
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: check for bogus modes
2008-07-25 10:53:45 -07:00
sysctl.c
sched: optimize group load balancer
2008-10-20 14:05:02 +02:00
taskstats.c
taskstats: remove initialization of static per-cpu variable
2008-07-25 10:53:47 -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
printk: robustify printk
2008-08-11 13:46:53 +02:00
tsacct.c
task IO accounting: move all IO statistics in struct task_io_accounting
2008-07-27 16:12:28 -07:00
uid16.c
asmlinkage_protect replaces prevent_tail_call
2008-04-10 17:28:26 -07:00
user_namespace.c
removed unused #include <linux/version.h>'s
2008-08-23 12:14:12 -07:00
user.c
sched: rt-bandwidth for user grouping interface
2008-08-19 13:10:09 +02:00
utsname_sysctl.c
sysctl: simplify ->strategy
2008-10-16 11:21:47 -07:00
utsname.c
removed unused #include <linux/version.h>'s
2008-08-23 12:14:12 -07:00
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