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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
Merge branches 'release', 'acpica', 'bugzilla-10224', 'bugzilla-9772', 'bugzilla-9916', 'ec', 'eeepc', 'idle', 'misc', 'pm-legacy', 'sysfs-links-2.6.26', 'thermal', 'thinkpad' and 'video' into release
2008-04-30 13:58:00 -04:00
time
clocksource: allow read access to available/current_clocksource
2008-05-03 18:11:48 +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_tree.c
[PATCH] list_for_each_rcu must die: audit
2008-05-17 03:30:23 -04:00
audit.c
[patch 1/1] audit_send_reply(): fix error-path memory leak
2008-05-17 03:30:22 -04:00
audit.h
[PATCH 1/2] audit: move extern declarations to audit.h
2008-04-28 06:28:04 -04:00
auditfilter.c
Merge branch 'audit.b50' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current
2008-04-29 11:41:22 -07:00
auditsc.c
[PATCH] new predicate - AUDIT_FILETYPE
2008-04-28 06:28:37 -04:00
backtracetest.c
x86: add a simple backtrace test module
2008-01-30 13:33:08 +01:00
bounds.c
Add kbuild.h that contains common definitions for kbuild users
2008-04-29 08:06:29 -07:00
capability.c
capabilities: remain source compatible with 32-bit raw legacy capability support.
2008-05-31 16:36:16 -07:00
cgroup_debug.c
CGroup API files: move "releasable" to cgroup_debug subsystem
2008-04-29 08:06:09 -07:00
cgroup.c
cgroups: remove node_ prefix_from ns subsystem
2008-05-24 09:56:14 -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
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
Add scaled time to taskstats based process accounting
2007-10-18 14:37:28 -07:00
dma.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
exec_domain.c
whitespace fixes: execution domains
2007-10-18 14:37:26 -07:00
exit.c
signals: fix sigqueue_free() vs __exit_signal() race
2008-05-24 09:56:10 -07:00
extable.c
module: Don't report discarded init pages as kernel text.
2008-01-29 17:13:18 +11:00
fork.c
[PATCH] dup_fd() fixes, part 1
2008-05-16 17:22:26 -04:00
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: remove duplicate helper function
2008-05-03 18:11:48 +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
sched: high-res preemption tick
2008-01-25 21:08:29 +01:00
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
is_power_of_2: kernel/kfifo.c
2007-07-16 09:05:50 -07:00
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
Kobject: convert remaining kobject_unregister() to kobject_put()
2008-01-24 20:40:40 -08:00
kthread.c
sched: prevent bound kthreads from changing cpus_allowed
2008-06-10 12:26:16 +02:00
latencytop.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
lockdep_internals.h
[PATCH] lockdep: more chains
2006-12-07 08:39:43 -08:00
lockdep_proc.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
lockdep.c
Subject: lockdep: include all lock classes in all_lock_classes
2008-02-25 23:03:02 +01:00
Makefile
sched: Move cpu masks from kernel/sched.c into kernel/cpu.c
2008-06-06 15:25:01 +02:00
marker.c
make marker_debug static
2008-04-30 08:29:49 -07:00
module.c
modules: proper cleanup of kobject without CONFIG_SYSFS
2008-05-23 13:09:33 +10:00
mutex-debug.c
kernel: remove fastcall in kernel/*
2008-02-08 09:22:31 -08:00
mutex-debug.h
…
mutex.c
kernel: remove fastcall in kernel/*
2008-02-08 09:22:31 -08:00
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_namespace.c
pidns: make pid->level and pid_ns->level unsigned
2008-04-30 08:29:49 -07:00
pid.c
pids: introduce change_pid() helper
2008-04-30 08:29:48 -07:00
pm_qos_params.c
pm qos infrastructure and interface
2008-02-05 09:44:22 -08:00
posix-cpu-timers.c
remove div_long_long_rem
2008-05-01 08:03:58 -07:00
posix-timers.c
signals: join send_sigqueue() with send_group_sigqueue()
2008-04-30 08:29:36 -07:00
printk.c
printk: don't read beyond string arguments' terminating zero
2008-04-30 08:29:52 -07:00
profile.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
ptrace.c
make generic sys_ptrace unconditional
2008-05-01 10:21:54 -07:00
rcuclassic.c
Preempt-RCU: implementation
2008-01-25 21:08:24 +01:00
rcupdate.c
rcupdate: fix comment
2008-02-13 16:21:18 -08:00
rcupreempt_trace.c
Preempt-RCU: implementation
2008-01-25 21:08:24 +01:00
rcupreempt.c
rcupreempt: remove export of rcu_batches_completed_bh
2008-06-19 09:45:37 +02:00
rcutorture.c
kernel: explicitly include required header files under kernel/
2008-04-29 08:06:04 -07:00
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_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
Driver core: change sysdev classes to use dynamic kobject names
2008-01-24 20:40:40 -08:00
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: 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
sched.c
sched: remove prio preference from balance decisions
2008-06-27 14:31:42 +02:00
seccomp.c
make seccomp zerocost in schedule
2007-07-16 09:05:50 -07:00
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
spinlock: lockbreak cleanup
2008-01-30 13:31:20 +01:00
srcu.c
make srcu_readers_active() static
2008-02-06 10:41:02 -08:00
stacktrace.c
…
stop_machine.c
stop_machine: make stop_machine_run more virtualization friendly
2008-05-23 13:09:34 +10:00
sys_ni.c
timerfd: new timerfd API
2008-02-05 09:44:07 -08:00
sys.c
sys_prctl(): fix return of uninitialized value
2008-05-24 09:56:13 -07:00
sysctl_check.c
constify tables in kernel/sysctl_check.c
2008-02-08 09:22:31 -08:00
sysctl.c
[PATCH] avoid multiplication overflows and signedness issues for max_fds
2008-05-16 17:22:52 -04:00
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
debugobjects: add timer specific object debugging code
2008-04-30 08:29:53 -07:00
tsacct.c
Add scaled time to taskstats based process accounting
2007-10-18 14:37:28 -07:00
uid16.c
asmlinkage_protect replaces prevent_tail_call
2008-04-10 17:28:26 -07:00
user_namespace.c
eCryptfs: make key module subsystem respect namespaces
2008-04-29 08:06:07 -07:00
user.c
alloc_uid: cleanup
2008-04-30 08:29:53 -07:00
utsname_sysctl.c
Isolate the UTS namespace's domainname and hostname back
2007-11-29 09:24:53 -08:00
utsname.c
kernel: explicitly include required header files under kernel/
2008-04-29 08:06:04 -07:00
wait.c
kernel: remove fastcall in kernel/*
2008-02-08 09:22:31 -08:00
workqueue.c
workqueue: remove redundant function invocation
2008-05-01 08:04:02 -07:00