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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
..
bitops [PATCH] sched: likely profiling 2006-10-11 11:14:22 -07:00
4level-fixup.h [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
Kbuild [HEADERS] One line per header in Kbuild files to reduce conflicts 2006-09-19 12:43:58 +01:00
Kbuild.asm [HEADERS] One line per header in Kbuild files to reduce conflicts 2006-09-19 12:43:58 +01:00
atomic.h [PATCH] Use atomic64_set for 64-bit case of atomic_long_set 2006-01-15 10:17:07 -08:00
audit_change_attr.h [PATCH] fix missing ifdefs in syscall classes hookup for generic targets 2006-09-22 17:48:56 -07:00
audit_dir_write.h [PATCH] fix missing ifdefs in syscall classes hookup for generic targets 2006-09-22 17:48:56 -07:00
audit_read.h [PATCH] audit: more syscall classes added 2006-09-11 13:32:27 -04:00
audit_write.h [PATCH] audit: more syscall classes added 2006-09-11 13:32:27 -04:00
bitops.h [PATCH] bitops: update include/asm-generic/bitops.h 2006-03-26 08:57:15 -08:00
bug.h [PATCH] Fix WARN_ON / WARN_ON_ONCE regression 2006-10-06 08:53:39 -07:00
cputime.h [CPUFREQ] Remove slowdown from ondemand sampling path. 2006-06-30 01:29:47 -04:00
div64.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dma-mapping-broken.h [PATCH] gfp_t: dma-mapping (simple cases) 2005-10-28 08:16:49 -07:00
dma-mapping.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
emergency-restart.h [PATCH] Add emergency_restart() 2005-07-26 14:35:41 -07:00
errno-base.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
errno.h [PATCH] add EOWNERDEAD and ENOTRECOVERABLE version 2 2005-05-01 08:59:06 -07:00
fcntl.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
futex.h [PATCH] lightweight robust futexes updates 2006-03-27 08:44:49 -08:00
ide_iops.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ioctl.h [PATCH] Generic ioctl.h 2006-01-10 08:01:34 -08:00
iomap.h [PATCH] add Big Endian variants of ioread/iowrite 2005-04-16 15:25:54 -07:00
ipc.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
irq_regs.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
libata-portmap.h [PATCH] libata: rework legacy handling to remove much of the cruft 2006-08-10 16:59:10 +09:00
local.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
memory_model.h [PATCH] squash duplicate page_to_pfn and pfn_to_page 2006-06-23 07:42:47 -07:00
mman.h [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
mutex-dec.h fix file specification in comments 2006-10-03 23:01:26 +02:00
mutex-null.h fix file specification in comments 2006-10-03 23:01:26 +02:00
mutex-xchg.h fix file specification in comments 2006-10-03 23:01:26 +02:00
page.h [PATCH] mm: consolidate get_order 2005-09-05 00:05:39 -07:00
pci-dma-compat.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pci.h [PATCH] Make sparc64 use setup-res.c 2005-09-08 14:57:25 -07:00
percpu.h [PATCH] Fix typo in "syntax error if percpu macros are incorrectly used" patch 2006-10-06 08:53:41 -07:00
pgtable-nopmd.h [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
pgtable-nopud.h [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
pgtable.h [PATCH] paravirt: remove set pte atomic 2006-10-01 00:39:34 -07:00
resource.h [PATCH] nice and rt-prio rlimits 2005-05-01 08:59:00 -07:00
rtc.h fix file specification in comments 2006-10-03 23:01:26 +02:00
sections.h [PATCH] add __[start|end]_rodata sections to asm-generic/sections.h 2006-07-01 09:56:03 -07:00
siginfo.h [PATCH] consolidate SIGEV_PAD_SIZE 2005-05-01 08:59:08 -07:00
signal.h Add standard include guard to asm-generic/signal and use compiler.h 2006-04-27 06:57:23 +01:00
statfs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
termios.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
tlb.h fix file specification in comments 2006-10-03 23:01:26 +02:00
topology.h [PATCH] x86/x86_64: pcibus_to_node 2005-06-23 09:45:08 -07:00
uaccess.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
unaligned.h [PATCH] __get_unaligned() gcc-4 fix 2006-03-08 14:14:00 -08:00
vmlinux.lds.h [PATCH] Include __param section in read-only data range 2006-09-27 08:26:19 -07:00
xor.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00