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android_kernel_xiaomi_sm8350/kernel
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Eric Dumazet cd7175edf9 [PATCH] Optimize calc_load() 
calc_load() is called by timer interrupt to update avenrun[].  It currently
calls nr_active() at each timer tick (HZ per second), while the update of
avenrun[] is done only once every 5 seconds.  (LOAD_FREQ=5 Hz)

nr_active() is quite expensive on SMP machines, since it has to sum up
nr_running and nr_uninterruptible of all online CPUS, bringing foreign
dirty cache lines.

This patch is an optimization of calc_load() so that nr_active() is called
only if we need it.

The use of unlikely() is welcome since the condition is true only once every
5*HZ time.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-13 09:05:55 -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] PM: Fix SMP races in the freezer 2006-12-13 09:05:49 -08:00
time [PATCH] clocksource: small cleanup 2006-12-10 09:57:22 -08:00
.gitignore
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
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
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] cpuset: rework cpuset_zone_allowed api 2006-12-13 09:05:49 -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
exit.c [PATCH] fdtable: Remove the free_files field 2006-12-10 09:57:22 -08:00
extable.c
fork.c [PATCH] fdtable: Remove the free_files field 2006-12-10 09:57:22 -08:00
futex_compat.c
futex.c [PATCH] kernel: change uses of f_{dentry, vfsmnt} to use f_path 2006-12-08 08:28:42 -08:00
hrtimer.c
itimer.c
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
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
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
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 [PATCH] lockdep: fix possible races while disabling lock-debugging 2006-12-13 09:05:50 -08:00
Makefile
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
mutex.c [PATCH] lockdep: avoid lockdep warning in md 2006-12-08 08:28:39 -08:00
mutex.h
nsproxy.c [PATCH] Revert "[PATCH] identifier to nsproxy" 2006-12-13 09:05:47 -08:00
panic.c
params.c
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
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] Fix numerous kcalloc() calls, convert to kzalloc() 2006-12-13 09:05:52 -08:00
resource.c [PATCH] struct seq_operations and struct file_operations constification 2006-12-07 08:39:46 -08:00
rtmutex_common.h
rtmutex-debug.c
rtmutex-debug.h
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
rtmutex.h
rwsem.c
sched.c [PATCH] lockdep: print irq-trace info on asserts 2006-12-13 09:05:50 -08:00
seccomp.c
signal.c [PATCH] PM: Fix freezing of stopped tasks 2006-12-13 09:05:49 -08:00
softirq.c [PATCH] softirq: remove BUG_ONs which can incorrectly trigger 2006-12-07 08:39:43 -08:00
softlockup.c
spinlock.c [PATCH] lockdep: spin_lock_irqsave_nested() 2006-11-25 13:28:34 -08:00
srcu.c
stacktrace.c
stop_machine.c
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] debug: add sysrq_always_enabled boot option 2006-12-13 09:05:50 -08:00
taskstats.c [PATCH] taskstats: cleanup reply assembling 2006-12-07 08:39:34 -08:00
time.c
timer.c [PATCH] Optimize calc_load() 2006-12-13 09:05:55 -08:00
tsacct.c [PATCH] io-accounting: via taskstats 2006-12-10 09:55:41 -08:00
uid16.c
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
wait.c
workqueue.c [PATCH] WorkStruct: Use direct assignment rather than cmpxchg() 2006-12-09 12:25:08 -08:00