Nick Piggin beed33a816 [PATCH] sched: likely profiling ... This likely profiling is pretty fun. I found a few possible problems in sched.c. This patch may be not measurable, but when I did measure long ago, nooping (un)likely cost a couple of % on scheduler heavy benchmarks, so it all adds up. Tweak some branch hints: - the 2nd 64 bits in the bitmask is likely to be populated, because it contains the first 28 bits (nearly 3/4) of the normal priorities. (ratio of 669669:691 ~= 1000:1). - it isn't unlikely that context switching switches to another process. it might be very rapidly switching to and from the idle process (ratio of 475815:419004 and 471330:423544). Let the branch predictor decide. - preempt_enable seems to be very often called in a nested preempt_disable or with interrupts disabled (ratio of 3567760:87965 ~= 40:1) Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: Daniel Walker <dwalker@mvista.com> Cc: Hua Zhong <hzhong@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		2006-10-11 11:14:22 -07:00
..
irq	[PATCH] ixp4xxdefconfig arm fixes	2006-10-06 12:11:08 -07:00
power	[PATCH] swsusp: Use suspend_console	2006-10-11 11:14:14 -07:00
time	[PATCH] kernel/time/ntp.c: possible cleanups	2006-10-01 00:39:27 -07:00
.gitignore
acct.c	[PATCH] csa: convert CONFIG tag for extended accounting routines	2006-10-01 00:39:29 -07:00
audit.c	[PATCH] kauditd_thread warning fix	2006-10-06 08:53:39 -07:00
audit.h
auditfilter.c	[PATCH] arch filter lists with < or > should not be accepted	2006-10-04 08:31:16 -04:00
auditsc.c	[PATCH] name_count array overrun	2006-10-04 08:31:21 -04:00
capability.c
compat.c	[PATCH] BLOCK: Revert patch to hack around undeclared sigset_t in linux/compat.h	2006-10-02 08:03:31 -07:00
configs.c
cpu.c
cpuset.c	[PATCH] cpuset ANSI prototype	2006-10-10 15:37:23 -07:00
delayacct.c
dma.c	[PATCH] kernel-doc for kernel/dma.c	2006-10-03 08:03:41 -07:00
exec_domain.c
exit.c	[PATCH] namespaces: exit_task_namespaces() invalidates nsproxy	2006-10-02 07:57:21 -07:00
extable.c
fork.c	[PATCH] IPC namespace - utils	2006-10-02 07:57:22 -07:00
futex_compat.c	[PATCH] __user annotations: futex	2006-10-10 15:37:22 -07:00
futex.c	[PATCH] __user annotations: futex	2006-10-10 15:37:22 -07:00
hrtimer.c
itimer.c
kallsyms.c	[PATCH] Create kallsyms_lookup_size_offset()	2006-10-03 08:03:41 -07:00
Kconfig.hz
Kconfig.preempt
kexec.c
kfifo.c
kmod.c	[PATCH] introduce kernel_execve	2006-10-02 07:57:23 -07:00
kprobes.c	[PATCH] kretprobe spinlock deadlock patch	2006-10-02 07:57:16 -07:00
ksysfs.c
kthread.c
latency.c
lockdep_internals.h
lockdep_proc.c
lockdep.c	[PATCH] namespaces: utsname: use init_utsname when appropriate	2006-10-02 07:57:21 -07:00
Makefile	[PATCH] srcu-3: RCU variant permitting read-side blocking	2006-10-04 07:55:30 -07:00
module.c	[PATCH] fix Module taint flags listing in Oops/panic	2006-10-11 11:14:21 -07:00
mutex-debug.c
mutex-debug.h
mutex.c
mutex.h
nsproxy.c	[PATCH] nsproxy cloning error path fix	2006-10-02 07:57:22 -07:00
panic.c
params.c
pid.c	[PATCH] introduce get_task_pid() to fix unsafe get_pid()	2006-10-02 07:57:25 -07:00
posix-cpu-timers.c
posix-timers.c	fix file specification in comments	2006-10-03 23:01:26 +02:00
printk.c
profile.c	IRQ: Maintain regs pointer globally rather than passing to IRQ handlers	2006-10-05 15:10:12 +01:00
ptrace.c
rcupdate.c	[PATCH] rcu: simplify/improve batch tuning	2006-10-04 07:55:31 -07:00
rcutorture.c	[PATCH] rcu: add sched torture type to rcutorture	2006-10-04 07:55:31 -07:00
relay.c	[PATCH] make kernel/relay.c __user-clean	2006-10-10 15:37:22 -07:00
resource.c	[PATCH] kernel-doc for kernel/resource.c	2006-10-03 08:03:41 -07:00
rtmutex_common.h
rtmutex-debug.c	Remove all inclusions of <linux/config.h>	2006-10-04 03:38:54 -04:00
rtmutex-debug.h
rtmutex-tester.c	Remove all inclusions of <linux/config.h>	2006-10-04 03:38:54 -04:00
rtmutex.c
rtmutex.h
rwsem.c
sched.c	[PATCH] sched: likely profiling	2006-10-11 11:14:22 -07:00
seccomp.c
signal.c	[PATCH] usb: fixup usb so it uses struct pid	2006-10-02 07:57:15 -07:00
softirq.c
softlockup.c
spinlock.c
srcu.c	[PATCH] SRCU: report out-of-memory errors	2006-10-04 07:55:30 -07:00
stacktrace.c
stop_machine.c
sys_ni.c
sys.c	[PATCH] SRCU: report out-of-memory errors	2006-10-04 07:55:30 -07:00
sysctl.c	[PATCH] replace cad_pid by a struct pid	2006-10-02 07:57:25 -07:00
taskstats.c	[PATCH] csa: Extended system accounting over taskstats	2006-10-01 00:39:29 -07:00
time.c
timer.c	[PATCH] kill wall_jiffies	2006-10-01 00:39:27 -07:00
tsacct.c	[PATCH] csa accounting taskstats update	2006-10-01 00:39:29 -07:00
uid16.c
unwind.c
user.c
utsname.c	[PATCH] namespaces: utsname: implement CLONE_NEWUTS flag	2006-10-02 07:57:22 -07:00
wait.c
workqueue.c	[PATCH] mm: kevent threads: use MPOL_DEFAULT	2006-10-11 11:14:19 -07:00