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Mike Galbraith d94b943054 perf top: Reduce display overhead 
Iterate over the symbol table once per display interval, and
copy/sort/tally/decay only those symbols which are active.

Before:

 top - 10:14:53 up  4:08, 17 users,  load average: 1.17, 1.53, 1.49
 Tasks: 273 total,   5 running, 268 sleeping,   0 stopped,   0 zombie
 Cpu(s):  6.9%us, 38.2%sy,  0.0%ni, 19.9%id,  0.0%wa,  0.0%hi, 35.0%si,  0.0%st

   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  P COMMAND
 28504 root      20   0  1044  260  164 S   58  0.0   0:04.19 2 netserver
 28499 root      20   0  1040  412  316 R   51  0.0   0:04.15 0 netperf
 28500 root      20   0  1040  408  316 R   50  0.0   0:04.14 1 netperf
 28503 root      20   0  1044  260  164 S   50  0.0   0:04.01 1 netserver
 28501 root      20   0  1044  260  164 S   49  0.0   0:03.99 0 netserver
 28502 root      20   0  1040  412  316 S   43  0.0   0:03.96 2 netperf
 28468 root      20   0 1892m 325m  972 S   16 10.8   0:10.50 3 perf
 28467 root      20   0 1892m 325m  972 R    2 10.8   0:00.72 3 perf

After:

 top - 10:16:30 up  4:10, 17 users,  load average: 2.27, 1.88, 1.62
 Tasks: 273 total,   6 running, 267 sleeping,   0 stopped,   0 zombie
 Cpu(s):  2.5%us, 39.7%sy,  0.0%ni, 24.6%id,  0.0%wa,  0.0%hi, 33.3%si,  0.0%st

   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  P COMMAND
 28590 root      20   0  1040  412  316 S   54  0.0   0:07.85 2 netperf
 28589 root      20   0  1044  260  164 R   54  0.0   0:07.84 0 netserver
 28588 root      20   0  1040  412  316 R   50  0.0   0:07.89 1 netperf
 28591 root      20   0  1044  256  164 S   50  0.0   0:07.82 1 netserver
 28587 root      20   0  1040  408  316 R   47  0.0   0:07.61 0 netperf
 28592 root      20   0  1044  260  164 R   47  0.0   0:07.85 2 netserver
 28378 root      20   0  8732 1300  860 R    2  0.0   0:01.81 3 top
 28577 root      20   0 1892m 165m  972 R    2  5.5   0:00.48 3 perf
 28578 root      20   0 1892m 165m  972 S    2  5.5   0:00.04 3 perf

[ Impact: optimization ]

Signed-off-by: Mike Galbraith <efault@gmx.de>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-05-25 13:01:17 +02:00
..
ABI
ACPI: add /sys/firmware/acpi/interrupts/sci_not counter
2009-04-21 00:35:47 -04:00
accounting
Documentation/accounting/getdelays.c: fix endless loop
2009-01-15 16:39:37 -08:00
acpi
ACPI: update debug parameter documentation
2008-11-07 21:45:29 -05:00
aoe
aoe: user can ask driver to forget previously detected devices
2008-02-08 09:22:31 -08:00
arm
Merge branch 'next-s3c-pm' of git://aeryn.fluff.org.uk/bjdooks/linux into devel
2009-03-26 22:44:43 +00:00
auxdisplay
.gitignore updates
2008-10-30 11:38:45 -07:00
blackfin
Blackfin arch: Add document about bfin-gpio
2009-01-07 23:14:38 +08:00
block
block: update biodoc.txt on plugging
2009-04-15 08:28:11 +02:00
blockdev
mflash: initial support
2009-04-07 08:12:38 +02:00
cdrom
doc/cdrom: Trvial documentation error, file not present
2008-10-10 08:22:44 +02:00
cgroups
memcg: fix documentation
2009-04-13 15:04:33 -07:00
connector
Documentation/connector/cn_test.c: don't use gfp_any()
2009-02-12 16:47:01 -08:00
console
Typo: fro -> from
2007-07-19 10:04:47 -07:00
cpu-freq
[CPUFREQ] ondemand/conservative: sanitize sampling_rate restrictions
2009-02-24 22:47:31 -05:00
cpuidle
cpuidle: Add Documentation
2008-02-14 00:16:13 -05:00
cris
fix random typos
2008-10-16 11:21:30 -07:00
crypto
async_tx, dmaengine: document channel allocation and api rework
2009-01-05 18:10:19 -07:00
development-process
Fix a typo in the development process document.
2009-01-08 16:32:13 -07:00
device-mapper
dm crypt: add documentation
2008-04-25 13:27:03 +01:00
DocBook
kgdb: gdb documentation fix
2009-05-15 07:56:25 -05:00
driver-model
Driver Core: early platform driver
2009-04-16 16:17:10 -07:00
dvb
V4L/DVB (11138): get_dvb_firmware: add support for downloading the cx2584x firmware for pvrusb2
2009-03-30 12:43:31 -03:00
early-userspace
Documentation: Remove last references to BitKeeper.
2008-04-21 22:19:05 +00:00
fault-injection
fault-injection: fix example scripts in documentation
2007-07-16 09:05:45 -07:00
fb
uvesafb: documentation update
2009-04-07 08:31:09 -07:00
filesystems
mm: close page_mkwrite races
2009-05-02 15:36:09 -07:00
firmware_class
firmware_sample_driver.c: fix coding style
2008-04-21 22:23:30 +00:00
frv
move frv docs one level up
2008-02-03 15:54:28 +02:00
hwmon
hwmon: add support for GMT G760A fan speed PWM controller
2009-04-07 08:31:03 -07:00
i2c
Move the pcf8591 driver to hwmon
2009-03-30 21:46:43 +02:00
i2o
documentation: convert the Documentation directory to UTF-8
2007-05-09 08:58:19 +02:00
ia64
trivial: Fix misspelling of firmware
2009-03-30 15:21:59 +02:00
ide
ide: update warm-plug HOWTO
2009-01-06 17:21:00 +01:00
infiniband
IPoIB: Document newish features
2009-04-08 13:52:01 -07:00
input
Input: document the multi-touch (MT) protocol
2009-04-30 10:41:39 -07:00
ioctl
V4L/DVB (10870a): remove all references for video_decoder.h
2009-03-30 12:43:15 -03:00
isdn
Add reference to CAPI 2.0 standard
2009-04-27 05:37:39 -07:00
ja_JP
Sync patch for jp_JP/stable_kernel_rules.txt
2009-01-28 15:55:48 -08:00
kbuild
kbuild: introduce subdir-ccflags-y
2009-04-19 11:12:12 +02:00
kdump
powerpc: Support for relocatable kdump kernel
2008-10-22 15:01:22 +11:00
ko_KR
HOWTO: update misspelling and word incorrected
2007-12-17 10:33:19 -08:00
laptops
thinkpad-acpi: bump up version to 0.23
2009-04-18 01:19:54 -04:00
lguest
lguest: document 32-bit and PAE requirements
2009-04-19 23:14:02 +09:30
m68k
[SCSI] 53c7xx: fix removal fallout
2008-01-11 18:22:30 -06:00
make
Documentation/make/headers_install.txt
2007-10-17 08:43:05 -07:00
mips
ide: remove unused CONFIG_BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ
2009-01-14 19:19:03 +01:00
misc-devices
drivers/misc/isl29003.c: driver for the ISL29003 ambient light sensor
2009-04-01 08:59:18 -07:00
mn10300
mn10300: add the MN10300/AM33 architecture to the kernel
2008-02-08 09:22:30 -08:00
mtd
[MTD] [NAND] nand_ecc.c: rewrite for improved performance
2008-08-16 10:55:33 +01:00
namespaces
The namespaces compatibility list doc
2007-11-29 09:24:53 -08:00
netlabel
Fix occurrences of "the the "
2007-05-09 08:57:56 +02:00
networking
Bonding: fix zero address hole bug in arp_ip_target list
2009-04-13 00:12:41 -07:00
parisc
…
PCI
PCI MSI: Add example request loop to MSI-HOWTO.txt
2009-03-20 11:35:04 -07:00
pcmcia
.gitignore updates
2008-10-30 11:38:45 -07:00
perf_counter
perf top: Reduce display overhead
2009-05-25 13:01:17 +02:00
power
pm: document use of RTC in pm_trace
2008-10-16 11:21:29 -07:00
powerpc
Merge branch 'merge' of git://git.secretlab.ca/git/linux-2.6 into merge
2009-04-22 13:02:09 +10:00
prctl
generic, x86: add tests for prctl PR_GET_TSC and PR_SET_TSC
2008-04-19 19:19:55 +02:00
RCU
Doc: Fix spelling in RCU/rculist_nulls.txt.
2009-04-02 01:33:51 -07:00
s390
documentation: update s390 header file paths
2009-01-06 15:59:28 -08:00
scheduler
trivial: fix where cgroup documentation is not correctly referred to
2009-03-30 15:22:02 +02:00
scsi
[SCSI] aacraid driver update
2009-04-03 09:23:11 -05:00
serial
Create/use more directory structure in the Documentation/ tree.
2008-11-14 17:28:53 +00:00
sh
sh: Kill off remaining CONFIG_SH_KGDB bits.
2008-12-22 18:44:05 +09:00
sound
ALSA: add missing definitions(letters) to HD-Audio.txt
2009-04-15 11:51:50 +02:00
sparc
sparc: Remove Documentation/sparc/sbus_drivers.txt
2008-08-29 02:15:25 -07:00
spi
spi: documentation: emphasise spi_master.setup() semantics
2009-04-21 13:41:50 -07:00
sysctl
Revert "mm: add /proc controls for pdflush threads"
2009-05-15 11:32:24 +02:00
telephony
remove mention of CONFIG_KMOD from documentation
2008-07-22 19:24:29 +10:00
thermal
thermal: update the documentation
2008-04-29 02:49:47 -04:00
timers
hpet: /dev/hpet - fixes and cleanup
2008-07-31 18:45:41 +02:00
trace
tracing: consolidate documents
2009-04-09 07:28:10 +02:00
uml
Fix typos in /Documentation : 'U-Z'
2006-11-30 04:58:40 +01:00
usb
USB: usbmon: Add binary API v1
2009-03-24 16:20:36 -07:00
video4linux
V4L/DVB (11373): v4l2-common: add explicit v4l2_device pointer as first arg to new_(probed)_subdev
2009-04-06 21:44:24 -03:00
vm
mm: add documentation describing what tsk->active_mm means vs tsk->mm
2009-04-13 15:04:32 -07:00
w1
w1: send status messages after command processing
2009-01-08 08:31:14 -08:00
watchdog
.gitignore updates
2008-10-30 11:38:45 -07:00
wimax
i2400m: documentation and instructions for usage
2009-01-07 10:00:18 -08:00
x86
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2009-04-03 15:24:35 -07:00
zh_CN
Chinese: add translation of Codingstyle
2008-01-24 20:40:04 -08:00
00-INDEX
trivial: fix where cgroup documentation is not correctly referred to
2009-03-30 15:22:02 +02:00
applying-patches.txt
…
atomic_ops.txt
documentation: atomic_add_unless() doesn't imply mb() on failure
2008-02-23 17:52:36 -08:00
bad_memory.txt
Document handling of bad memory
2008-12-03 16:09:53 -07:00
basic_profiling.txt
…
binfmt_misc.txt
documentation: convert the Documentation directory to UTF-8
2007-05-09 08:58:19 +02:00
braille-console.txt
Basic braille screen reader support
2008-04-30 08:29:52 -07:00
bt8xxgpio.txt
gpio: add bt8xxgpio driver
2008-07-25 10:53:30 -07:00
BUG-HUNTING
Documentation: add hint about call traces & module symbols to BUG-HUNTING
2008-02-06 10:41:09 -08:00
c2port.txt
Add c2 port support
2008-11-12 17:17:18 -08:00
cachetlb.txt
remove unused flush_tlb_pgtables
2007-10-19 11:53:34 -07:00
Changes
Documentation/Changes: add required versions for new filesystems
2009-01-29 18:19:30 -08:00
CodingStyle
fix emacs indenting howto filename expansion
2009-01-29 18:19:29 -08:00
cpu-hotplug.txt
x86: use possible_cpus=NUM to extend the possible cpus allowed
2008-12-18 12:08:05 +01:00
cpu-load.txt
[PATCH] Documentation: CPU load calculation description
2007-03-01 14:53:39 -08:00
cputopology.txt
cpumask: Use topology_core_cpumask()/topology_thread_cpumask()
2009-01-11 19:12:49 +01:00
credentials.txt
CRED: Documentation
2008-11-14 10:39:26 +11:00
dcdbas.txt
…
debugging-modules.txt
Documentation: Clarify when module debugging actually works.
2008-02-03 15:27:38 +02:00
debugging-via-ohci1394.txt
firewire: fw-ohci: add option for remote debugging
2008-04-18 17:55:33 +02:00
dell_rbu.txt
trivial: fix an -> a typos in documentation and comments
2009-01-06 11:28:07 +01:00
devices.txt
lanana: assign a device name and numbering for MAX3100
2009-04-07 08:44:05 -07:00
DMA-API.txt
dma-debug: Documentation update
2009-03-17 12:56:47 +01:00
DMA-attributes.txt
powerpc/cell: Add DMA_ATTR_WEAK_ORDERING dma attribute and use in Cell IOMMU code
2008-07-22 10:39:36 +10:00
DMA-ISA-LPC.txt
Fix typos in /Documentation : 'T''
2006-11-30 04:55:36 +01:00
DMA-mapping.txt
dma-mapping: update the old macro DMA_nBIT_MASK related documentations
2009-04-07 08:31:12 -07:00
dmaengine.txt
async_tx, dmaengine: document channel allocation and api rework
2009-01-05 18:10:19 -07:00
dontdiff
dontdiff: Fix asm exclude
2009-03-26 15:45:43 -07:00
dynamic-debug-howto.txt
Dynamic debug: allow simple quoting of words
2009-03-24 16:38:27 -07:00
edac.txt
Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.
2008-07-26 12:00:06 -07:00
eisa.txt
Fix typos in /Documentation : 'U-Z'
2006-11-30 04:58:40 +01:00
email-clients.txt
Documentation/email-clients.txt: add some info about gmail
2008-11-06 15:41:19 -08:00
exception.txt
Documentation: remove duplicated words
2006-10-03 22:57:56 +02:00
feature-removal-schedule.txt
i2c-voodoo3: Deprecate in favor of tdfxfb
2009-04-13 17:02:13 +02:00
gpio.txt
gpio: gpio_{request,free}() now required (feature removal)
2009-04-02 19:04:51 -07:00
highuid.txt
[SPARC]: Remove SunOS and Solaris binary support.
2008-04-21 15:10:15 -07:00
HOWTO
Remove Andrew Morton's http://www.zip.com.au/~akpm/
2008-10-16 11:21:32 -07:00
hw_random.txt
hw_random doc updates
2008-03-24 19:22:19 -07:00
ics932s401
ics932s401: new clock generator chip driver
2008-11-12 17:17:18 -08:00
initrd.txt
use the newc archive format as requested by initramfs
2008-02-03 14:54:41 +02:00
Intel-IOMMU.txt
Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.
2008-07-26 12:00:06 -07:00
io_ordering.txt
…
io-mapping.txt
io mapping: improve documentation
2008-11-03 18:21:44 +01:00
IO-mapping.txt
Documentation: move DMA-mapping.txt to Doc/PCI/
2009-01-29 18:19:29 -08:00
iostats.txt
Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.
2008-07-26 12:00:06 -07:00
IPMI.txt
IPMI: new NMI handling
2007-10-18 14:37:32 -07:00
IRQ-affinity.txt
genirq: Expose default irq affinity mask (take 3)
2008-06-05 15:18:30 +02:00
IRQ.txt
[PATCH] genirq: irq: document what an IRQ is
2006-06-29 10:26:25 -07:00
irqflags-tracing.txt
[PATCH] lockdep: irqtrace subsystem, docs
2006-07-03 15:27:03 -07:00
isapnp.txt
…
java.txt
Documentation/java.txt: typo and grammar fixes
2007-10-20 02:37:21 +02:00
kernel-doc-nano-HOWTO.txt
kernel-doc: restrict syntax for private: and public:
2009-05-02 15:36:10 -07:00
kernel-docs.txt
doc: update to URL and status of kernel-docs.txt entry
2008-06-06 11:29:10 -07:00
kernel-parameters.txt
doc: small kernel-parameters updates
2009-05-06 16:36:10 -07:00
keys-request-key.txt
keys: allow the callout data to be passed as a blob rather than a string
2008-04-29 08:06:16 -07:00
keys.txt
Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.
2008-07-26 12:00:06 -07:00
kobject.txt
kobject: Make Documentation/kobject.txt a little more coherent.
2009-01-06 10:44:32 -08:00
kprobes.txt
kprobes: support kretprobe and jprobe per-probe disabling
2009-04-07 08:31:08 -07:00
kref.txt
docs: convert kref semaphore to mutex
2008-02-06 10:41:09 -08:00
ldm.txt
LDM: Fix for Windows Vista dynamic disks
2007-05-21 09:58:40 -07:00
leds-class.txt
Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.
2008-07-26 12:00:06 -07:00
local_ops.txt
documentation: local_ops fix on_each_cpu
2008-12-01 13:51:26 +01:00
lockdep-design.txt
locking: Documentation: lockdep-design.txt, fix note of state bits
2009-04-26 18:21:24 +02:00
lockstat.txt
lockstat: contend with points
2008-10-20 15:43:10 +02:00
logo.gif
Revert "linux.conf.au 2009: Tuz"
2009-04-27 12:00:27 -07:00
logo.txt
Revert "linux.conf.au 2009: Tuz"
2009-04-27 12:00:27 -07:00
magic-number.txt
documentation: update header file paths
2009-01-06 15:59:28 -08:00
Makefile
docsrc: build Documentation/ sources
2008-08-12 16:07:30 -07:00
ManagementStyle
docs: fix ManagementStyle book name
2008-10-30 11:38:46 -07:00
markers.txt
markers: comment marker_synchronize_unregister() on data dependency
2008-11-28 16:47:41 +01:00
mca.txt
The ps2esdi driver was marked as BROKEN more than two years ago due to being
2008-03-17 09:03:05 +01:00
md.txt
Documentation/md.txt update
2009-03-31 15:18:37 +11:00
memory-barriers.txt
read_barrier_depends arch fixlets
2008-05-14 10:05:18 -07:00
memory-hotplug.txt
mm: show node to memory section relationship with symlinks in sysfs
2009-01-06 15:59:00 -08:00
memory.txt
…
mono.txt
Fix "can not" in Documentation and Kconfig
2006-10-03 22:53:09 +02:00
mutex-design.txt
Documentation: Add nested versions of mutex locks to docs
2007-10-20 00:15:26 +02:00
nmi_watchdog.txt
x86, nmi-watchdog: update procfs nmi_watchdog file documentation v2
2008-10-30 19:07:04 +01:00
nommu-mmap.txt
NOMMU: Make mmap allocation page trimming behaviour configurable.
2009-01-08 12:04:47 +00:00
numastat.txt
…
oops-tracing.txt
Taint kernel after WARN_ON(condition)
2008-04-29 08:05:59 -07:00
parport-lowlevel.txt
plip: fix parport_register_device name parameter
2007-11-26 19:39:01 -08:00
parport.txt
…
pi-futex.txt
fix a typo in Documentation/pi-futex.txt
2006-10-03 23:39:02 +02:00
pnp.txt
Documentation: Replace obsolete "driverfs" with "sysfs".
2008-01-24 20:40:04 -08:00
preempt-locking.txt
…
printk-formats.txt
DOC: add printk-formats.txt
2008-11-12 17:17:17 -08:00
prio_tree.txt
Documentation: remove duplicated words
2006-10-03 22:57:56 +02:00
rbtree.txt
[PATCH] Documentation/rbtree.txt
2007-02-11 10:51:35 -08:00
rfkill.txt
rfkill: add master_switch_mode and EPO lock to rfkill and rfkill-input
2008-10-31 19:00:09 -04:00
robust-futex-ABI.txt
Fix typos in /Documentation : 'U-Z'
2006-11-30 04:58:40 +01:00
robust-futexes.txt
Fix typos in /Documentation : Misc
2006-11-30 05:21:10 +01:00
rt-mutex-design.txt
[PATCH] typo fixes for rt-mutex-design.txt
2006-10-01 00:39:24 -07:00
rt-mutex.txt
[PATCH] pi-futex: rt mutex docs
2006-06-27 17:32:47 -07:00
rtc.txt
rtc: cleanup example code
2008-02-06 10:41:14 -08:00
SAK.txt
Remove Andrew Morton's old email accounts
2008-10-16 11:21:32 -07:00
SecurityBugs
…
SELinux.txt
selinux: add support for installing a dummy policy (v2)
2008-08-27 08:54:08 +10:00
serial-console.txt
[PATCH] doc: more serial-console info
2006-03-25 08:23:00 -08:00
sgi-ioc4.txt
…
sgi-visws.txt
…
slow-work.txt
Document the slow work thread pool
2009-04-03 16:42:35 +01:00
SM501.txt
Tweak Documentation/SM501.txt
2007-10-17 08:43:06 -07:00
Smack.txt
smack: Add a new '-CIPSO' option to the network address label configuration
2009-03-28 15:01:37 +11:00
sparse.txt
Documentation: explain the difference between __bitwise and __bitwise__
2009-04-11 08:18:11 +02:00
spinlocks.txt
Add additional examples in Documentation/spinlocks.txt
2008-04-11 13:21:14 -06:00
stable_api_nonsense.txt
stable_api_nonsense.txt: Disambiguate the use of "this" by using "that" to refer to the syscall interface
2007-07-30 14:25:12 -07:00
stable_kernel_rules.txt
Update stable tree documentation
2008-10-29 15:03:49 -07:00
SubmitChecklist
documentation: explain memory barriers
2008-10-16 11:21:32 -07:00
SubmittingDrivers
Remove Andrew Morton's old email accounts
2008-10-16 11:21:32 -07:00
SubmittingPatches
Merge branch 'docs' of git://git.lwn.net/linux-2.6
2008-10-16 12:18:16 -07:00
svga.txt
…
sysfs-rules.txt
Doc/sysfs-rules: Swap the order of the words so the sentence makes more sense
2009-05-08 19:22:20 -07:00
sysrq.txt
Merge branch 'tracing/core-v2' into tracing-for-linus
2009-04-02 00:49:02 +02:00
tomoyo.txt
tomoyo: add Documentation/tomoyo.txt
2009-04-14 09:14:58 +10:00
unaligned-memory-access.txt
introduce HAVE_EFFICIENT_UNALIGNED_ACCESS Kconfig symbol
2008-07-25 10:53:27 -07:00
unicode.txt
…
unshare.txt
Documentation: remove duplicated words
2006-10-03 22:57:56 +02:00
VGA-softcursor.txt
…
video-output.txt
output: Add output class document
2006-12-20 01:46:58 -05:00
volatile-considered-harmful.txt
Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.
2008-07-26 12:00:06 -07:00
voyager.txt
…
zorro.txt
…