Christoph Lameter 1bd77f2da5 [PATCH] sched: call tasklet less frequently ... Trigger softirq less frequently We trigger the softirq before this patch using offset of sd->interval. However, if the queue is busy then it is sufficient to schedule the softirq with sd->interval * busy_factor. So we modify the calculation of the next time to balance by taking the interval added to last_balance again. This is only the right value if the idle/busy situation continues as is. There are two potential trouble spots: - If the queue was idle and now gets busy then we call rebalance early. However, that is not a problem because we will then use the longer interval for the next period. - If the queue was busy and becomes idle then we potentially wait too long before rebalancing. However, when the task goes idle then idle_balance is called. We add another calculation of the next balance time based on sd->interval in idle_balance so that we will rebalance soon. V2->V3: - Calculate rebalance time based on current jiffies and not based on the jiffies at the last time we load balanced. We no longer rely on staggering and therefore we can affort to do this now. V3->V4: - Use functions to do jiffy comparisons. Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: Peter Williams <pwil3058@bigpond.net.au> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Christoph Lameter <clameter@sgi.com> Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com> Cc: "Chen, Kenneth W" <kenneth.w.chen@intel.com> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		2006-12-10 09:55:43 -08:00
..
irq	[PATCH] CPEI gets warning at kernel/irq/migration.c:27/move_masked_irq()	2006-12-08 08:28:37 -08:00
power	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
time	[PATCH] time_adjust cleared before use	2006-10-28 11:30:55 -07:00
.gitignore	gitignore: ignore more generated files	2006-01-03 11:35:26 +01:00
acct.c	[PATCH] kernel: change uses of f_{dentry, vfsmnt} to use f_path	2006-12-08 08:28:42 -08:00
audit.c	[PATCH] Add include/linux/freezer.h and move definitions from sched.h	2006-12-07 08:39:27 -08:00
audit.h	[PATCH] audit: AUDIT_PERM support	2006-09-11 13:32:30 -04:00
auditfilter.c	[PATCH] kernel core: replace kmalloc+memset with kzalloc	2006-12-07 08:39:41 -08:00
auditsc.c	[PATCH] struct path: convert kernel	2006-12-08 08:28:46 -08:00
capability.c	[PATCH] pidspace: is_init()	2006-09-29 09:18:12 -07:00
compat.c	[PATCH] Create compat_sys_migrate_pages	2006-11-03 12:27:59 -08:00
configs.c	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
cpu.c	[PATCH] suspend: don't change cpus_allowed for task initiating the suspend	2006-12-07 08:39:28 -08:00
cpuset.c	[PATCH] struct path: convert kernel	2006-12-08 08:28:46 -08:00
delayacct.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
dma.c	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
exec_domain.c	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
exit.c	[PATCH] session_of_pgrp: kill unnecessary do_each_task_pid(PIDTYPE_PGID)	2006-12-08 08:28:52 -08:00
extable.c	[PATCH] symbol_put_addr() locks kernel	2006-05-15 11:20:55 -07:00
fork.c	[PATCH] io-accounting: core statistics	2006-12-10 09:55:41 -08:00
futex_compat.c	[PATCH] __user annotations: futex	2006-10-10 15:37:22 -07:00
futex.c	[PATCH] kernel: change uses of f_{dentry, vfsmnt} to use f_path	2006-12-08 08:28:42 -08:00
hrtimer.c	[PATCH] posix-timers: Fix clock_nanosleep() doesn't return the remaining time in compatibility mode	2006-09-29 09:18:15 -07:00
itimer.c	[PATCH] hrtimers: remove data field	2006-03-26 08:57:03 -08:00
kallsyms.c	[PATCH] move kallsyms data to .rodata	2006-12-08 08:28:37 -08:00
Kconfig.hz	[PATCH] HZ: 300Hz support	2006-12-07 08:39:36 -08:00
Kconfig.preempt	[PATCH] sched: voluntary kernel preemption	2005-06-25 16:24:45 -07:00
kexec.c	Merge branch 'release' of master.kernel.org:/pub/scm/linux/kernel/git/aegl/linux-2.6	2006-12-07 15:39:22 -08:00
kfifo.c	[PATCH] memory ordering in __kfifo primitives	2006-09-29 09:18:13 -07:00
kmod.c	[PATCH] rename struct namespace to struct mnt_namespace	2006-12-08 08:28:51 -08:00
kprobes.c	[PATCH] kprobes: enable booster on the preemptible kernel	2006-12-07 08:39:38 -08:00
ksysfs.c	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
kthread.c	WorkStruct: Pass the work_struct pointer instead of context data	2006-11-22 14:55:48 +00:00
latency.c	[PATCH] severing module.h->sched.h	2006-12-04 02:00:22 -05:00
lockdep_internals.h	[PATCH] lockdep: more chains	2006-12-07 08:39:43 -08:00
lockdep_proc.c	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
lockdep.c	Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6	2006-12-07 08:59:11 -08:00
Makefile	[PATCH] srcu-3: RCU variant permitting read-side blocking	2006-10-04 07:55:30 -07:00
module.c	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
mutex-debug.c	[PATCH] lockdep: show more details about self-test failures	2006-12-07 08:39:43 -08:00
mutex-debug.h	[PATCH] lockdep: better lock debugging	2006-07-03 15:27:01 -07:00
mutex.c	[PATCH] lockdep: avoid lockdep warning in md	2006-12-08 08:28:39 -08:00
mutex.h	[PATCH] lockdep: prove mutex locking correctness	2006-07-03 15:27:04 -07:00
nsproxy.c	[PATCH] to nsproxy	2006-12-08 08:28:52 -08:00
panic.c	[PATCH] x86: Clean up x86 NMI sysctls	2006-09-30 01:47:55 +02:00
params.c	[PATCH] module_subsys: initialize earlier	2006-09-29 09:18:08 -07:00
pid.c	[PATCH] add child reaper to pid_namespace	2006-12-08 08:28:52 -08:00
posix-cpu-timers.c	[PATCH] posix-cpu-timers: prevent signal delivery starvation	2006-10-17 08:18:43 -07:00
posix-timers.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
printk.c	[PATCH] add ignore_loglevel boot option	2006-12-07 08:39:47 -08:00
profile.c	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
ptrace.c	[PATCH] pidspace: is_init()	2006-09-29 09:18:12 -07:00
rcupdate.c	[PATCH] rcu: add a prefetch() in rcu_do_batch()	2006-12-07 08:39:40 -08:00
rcutorture.c	[PATCH] Add Sparse annotations to SRCU wrapper functions in rcutorture	2006-12-07 08:39:44 -08:00
relay.c	[PATCH] kernel: change uses of f_{dentry, vfsmnt} to use f_path	2006-12-08 08:28:42 -08:00
resource.c	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
rtmutex_common.h	[PATCH] pi-futex: futex_lock_pi/futex_unlock_pi support	2006-06-27 17:32:47 -07:00
rtmutex-debug.c	Remove all inclusions of <linux/config.h>	2006-10-04 03:38:54 -04:00
rtmutex-debug.h	[PATCH] lockdep: better lock debugging	2006-07-03 15:27:01 -07:00
rtmutex-tester.c	[PATCH] Add include/linux/freezer.h and move definitions from sched.h	2006-12-07 08:39:27 -08:00
rtmutex.c	[PATCH] clean up and remove some extra spinlocks from rtmutex	2006-09-29 09:18:09 -07:00
rtmutex.h	[PATCH] lockdep: better lock debugging	2006-07-03 15:27:01 -07:00
rwsem.c	[PATCH] lockdep: prove rwsem locking correctness	2006-07-03 15:27:04 -07:00
sched.c	[PATCH] sched: call tasklet less frequently	2006-12-10 09:55:43 -08:00
seccomp.c	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
signal.c	[PATCH] add child reaper to pid_namespace	2006-12-08 08:28:52 -08:00
softirq.c	[PATCH] softirq: remove BUG_ONs which can incorrectly trigger	2006-12-07 08:39:43 -08:00
softlockup.c	[PATCH] check return value of cpu_callback	2006-09-29 09:18:14 -07:00
spinlock.c	[PATCH] lockdep: spin_lock_irqsave_nested()	2006-11-25 13:28:34 -08:00
srcu.c	[PATCH] SRCU: report out-of-memory errors	2006-10-04 07:55:30 -07:00
stacktrace.c	[PATCH] lockdep: stacktrace subsystem, core	2006-07-03 15:27:02 -07:00
stop_machine.c	[PATCH] stop_machine.c copyright	2006-09-29 09:18:24 -07:00
sys_ni.c	[PATCH] Create compat_sys_migrate_pages	2006-11-03 12:27:59 -08:00
sys.c	[PATCH] sys_setpgid: eliminate unnecessary do_each_task_pid(PIDTYPE_PGID)	2006-12-08 08:28:52 -08:00
sysctl.c	[PATCH] sysctl: remove unused "context" param	2006-12-10 09:55:41 -08:00
taskstats.c	[PATCH] taskstats: cleanup reply assembling	2006-12-07 08:39:34 -08:00
time.c	[PATCH] NTP: Move all the NTP related code to ntp.c	2006-10-01 00:39:26 -07:00
timer.c	[PATCH] kill wall_jiffies	2006-10-01 00:39:27 -07:00
tsacct.c	[PATCH] io-accounting: via taskstats	2006-12-10 09:55:41 -08:00
uid16.c	[PATCH] Add more prevent_tail_call()	2006-04-19 16:27:18 -07:00
unwind.c	[PATCH] unwinder: move .eh_frame to RODATA	2006-12-07 02:14:19 +01:00
user.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
utsname.c	[PATCH] namespaces: utsname: implement CLONE_NEWUTS flag	2006-10-02 07:57:22 -07:00
wait.c	[PATCH] uninline init_waitqueue_head()	2006-07-10 13:24:25 -07:00
workqueue.c	[PATCH] WorkStruct: Use direct assignment rather than cmpxchg()	2006-12-09 12:25:08 -08:00