Peter Zijlstra cb5ef42a03 sched: optimize effective_load() ... s_i = S * rw_i / \Sum_j rw_j -> \Sum_j rw_j = S * rw_i / s_i -> s'_i = S * (rw_i + w) / (\Sum_j rw_j + w) delta s = s' - s = S * (rw + w) / ((S * rw / s) + w) = s * (S * (rw + w) / (S * rw + s * w) - 1) a = S*(rw+w), b = S*rw + s*w delta s = s * (a-b) / b IOW, trade one divide for two multiplies Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Cc: Mike Galbraith <efault@gmx.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2008-06-27 14:31:43 +02:00
..
irq	genirq: reenable a nobody cared disabled irq when a new driver arrives	2008-05-02 13:40:34 +02:00
power	…
time	clocksource: allow read access to available/current_clocksource	2008-05-03 18:11:48 +02:00
.gitignore	…
Kconfig.hz	…
Kconfig.preempt	…
Makefile	sched: Move cpu masks from kernel/sched.c into kernel/cpu.c	2008-06-06 15:25:01 +02:00
acct.c	…
audit.c	[patch 1/1] audit_send_reply(): fix error-path memory leak	2008-05-17 03:30:22 -04:00
audit.h	…
audit_tree.c	[PATCH] list_for_each_rcu must die: audit	2008-05-17 03:30:23 -04:00
auditfilter.c	…
auditsc.c	…
backtracetest.c	…
bounds.c	…
capability.c	capabilities: remain source compatible with 32-bit raw legacy capability support.	2008-05-31 16:36:16 -07:00
cgroup.c	cgroups: remove node_ prefix_from ns subsystem	2008-05-24 09:56:14 -07:00
cgroup_debug.c	…
compat.c	ntp: support for TAI	2008-05-01 08:03:59 -07:00
configs.c	…
cpu.c	sched: Move cpu masks from kernel/sched.c into kernel/cpu.c	2008-06-06 15:25:01 +02:00
cpuset.c	Merge branch 'linus' into sched/devel	2008-06-23 11:30:23 +02:00
delayacct.c	…
dma.c	…
exec_domain.c	…
exit.c	signals: fix sigqueue_free() vs __exit_signal() race	2008-05-24 09:56:10 -07:00
extable.c	…
fork.c	[PATCH] dup_fd() fixes, part 1	2008-05-16 17:22:26 -04:00
futex.c	futexes: fix fault handling in futex_lock_pi	2008-06-23 13:31:15 +02:00
futex_compat.c	…
hrtimer.c	hrtimer: remove duplicate helper function	2008-05-03 18:11:48 +02:00
itimer.c	…
kallsyms.c	…
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	kprobes: fix error checking of batch registration	2008-06-12 18:05:40 -07:00
ksysfs.c	…
kthread.c	sched: prevent bound kthreads from changing cpus_allowed	2008-06-10 12:26:16 +02:00
latencytop.c	…
lockdep.c	…
lockdep_internals.h	…
lockdep_proc.c	…
marker.c	…
module.c	modules: proper cleanup of kobject without CONFIG_SYSFS	2008-05-23 13:09:33 +10:00
mutex-debug.c	…
mutex-debug.h	…
mutex.c	…
mutex.h	…
notifier.c	…
ns_cgroup.c	…
nsproxy.c	…
panic.c	…
params.c	…
pid.c	…
pid_namespace.c	…
pm_qos_params.c	…
posix-cpu-timers.c	remove div_long_long_rem	2008-05-01 08:03:58 -07:00
posix-timers.c	…
printk.c	…
profile.c	…
ptrace.c	make generic sys_ptrace unconditional	2008-05-01 10:21:54 -07:00
rcuclassic.c	…
rcupdate.c	…
rcupreempt.c	rcupreempt: remove export of rcu_batches_completed_bh	2008-06-19 09:45:37 +02:00
rcupreempt_trace.c	…
rcutorture.c	…
relay.c	splice: fix sendfile() issue with relay	2008-05-28 14:49:27 +02:00
res_counter.c	…
resource.c	…
rtmutex-debug.c	…
rtmutex-debug.h	…
rtmutex-tester.c	…
rtmutex.c	…
rtmutex.h	…
rtmutex_common.h	…
rwsem.c	…
sched.c	sched: remove prio preference from balance decisions	2008-06-27 14:31:42 +02:00
sched_clock.c	sched: sched_clock_cpu() based cpu_clock()	2008-06-27 14:31:30 +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	sched: optimize effective_load()	2008-06-27 14:31:43 +02:00
sched_features.h	sched: fix calc_delta_asym()	2008-06-27 14:31:28 +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	sched: revert revert of: fair-group: SMP-nice for group scheduling	2008-06-27 14:31:29 +02:00
sched_stats.h	sched, delay accounting: fix incorrect delay time when constantly waiting on runqueue	2008-06-19 14:15:28 +02:00
seccomp.c	…
semaphore.c	Revert "semaphore: fix"	2008-05-10 20:43:22 -07:00
signal.c	posix timers: discard SI_TIMER signals on exec	2008-05-26 10:37:07 -07:00
softirq.c	Fix cpu hotplug problem in softirq code	2008-05-01 08:03:58 -07:00
softlockup.c	softlockup: fix NMI hangs due to lock race - 2.6.26-rc regression	2008-06-19 09:45:38 +02:00
spinlock.c	…
srcu.c	…
stacktrace.c	…
stop_machine.c	stop_machine: make stop_machine_run more virtualization friendly	2008-05-23 13:09:34 +10:00
sys.c	sys_prctl(): fix return of uninitialized value	2008-05-24 09:56:13 -07:00
sys_ni.c	…
sysctl.c	[PATCH] avoid multiplication overflows and signedness issues for max_fds	2008-05-16 17:22:52 -04:00
sysctl_check.c	…
taskstats.c	…
test_kprobes.c	…
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	…
tsacct.c	…
uid16.c	…
user.c	…
user_namespace.c	…
utsname.c	…
utsname_sysctl.c	…
wait.c	…
workqueue.c	workqueue: remove redundant function invocation	2008-05-01 08:04:02 -07:00