Peter Oberparleiter 2521f2c228 gcov: add gcov profiling infrastructure ... Enable the use of GCC's coverage testing tool gcov [1] with the Linux kernel. gcov may be useful for: * debugging (has this code been reached at all?) * test improvement (how do I change my test to cover these lines?) * minimizing kernel configurations (do I need this option if the associated code is never run?) The profiling patch incorporates the following changes: * change kbuild to include profiling flags * provide functions needed by profiling code * present profiling data as files in debugfs Note that on some architectures, enabling gcc's profiling option "-fprofile-arcs" for the entire kernel may trigger compile/link/ run-time problems, some of which are caused by toolchain bugs and others which require adjustment of architecture code. For this reason profiling the entire kernel is initially restricted to those architectures for which it is known to work without changes. This restriction can be lifted once an architecture has been tested and found compatible with gcc's profiling. Profiling of single files or directories is still available on all platforms (see config help text). [1] http://gcc.gnu.org/onlinedocs/gcc/Gcov.html Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Huang Ying <ying.huang@intel.com> Cc: Li Wei <W.Li@Sun.COM> Cc: Michael Ellerman <michaele@au1.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Heiko Carstens <heicars2@linux.vnet.ibm.com> Cc: Martin Schwidefsky <mschwid2@linux.vnet.ibm.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: WANG Cong <xiyou.wangcong@gmail.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-06-18 13:03:57 -07:00
..
ABI	Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block	2009-06-11 11:10:35 -07:00
DocBook	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
PCI	PCI MSI: Add example request loop to MSI-HOWTO.txt	2009-03-20 11:35:04 -07:00
RCU	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
accounting	Documentation/accounting/getdelays.c intialize the variable before using it	2009-06-16 19:47:51 -07:00
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	[ARM] S3C24XX: GPIO: Change to macros for GPIO numbering	2009-05-18 16:26:03 +01:00
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	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
blockdev	mflash: initial support	2009-04-07 08:12:38 +02:00
cdrom	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
cgroups	memcg: add interface to reset limits	2009-06-18 13:03:48 -07:00
connector	Documentation/connector/cn_test.c comment unused cn_test_want_notify()	2009-06-18 13:03:46 -07:00
console	Typo: fro -> from	2007-07-19 10:04:47 -07:00
cpu-freq	[CPUFREQ] minor correction to cpu-freq documentation	2009-06-15 11:49:42 -04:00
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	docs: Encourage better changelogs in the development process document	2009-06-04 10:32:49 -06:00
device-mapper	dm crypt: add documentation	2008-04-25 13:27:03 +01:00
driver-model	Driver Core: Warn driver authors about adding device attributes	2009-06-15 21:30:23 -07:00
dvb	V4L/DVB (11962): dvb: Fix broken link in get_dvb_firmware for nxt2004 (A180)	2009-06-16 19:07:39 -03:00
early-userspace	Documentation: Remove last references to BitKeeper.	2008-04-21 22:19:05 +00:00
fault-injection	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
fb	Documentation/fb/vesafb.txt: fix typo	2009-06-16 19:47:58 -07:00
filesystems	isofs: let mode and dmode mount options override rock ridge mode setting	2009-06-18 13:03:45 -07:00
firmware_class	driver core: fix documentation of request_firmware_nowait	2009-06-15 21:30:24 -07:00
frv	move frv docs one level up	2008-02-03 15:54:28 +02:00
hwmon	hwmon: (f71882fg) Add support for the F71858F	2009-06-15 18:39:52 +02:00
i2c	i2c-viapro: Add new PCI device ID for VX855	2009-06-15 18:01:49 +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: preserve Host Protected Area by default (v2)	2009-06-07 13:52:52 +02:00
infiniband	IPoIB: Document newish features	2009-04-08 13:52:01 -07:00
input	Input: multitouch - augment event semantics documentation	2009-05-23 09:53:26 -07:00
ioctl	V4L/DVB (10870a): remove all references for video_decoder.h	2009-03-30 12:43:15 -03:00
isdn	isdn: extend INTERFACE.CAPI document	2009-06-08 00:45:52 -07:00
ja_JP	Sync patch for jp_JP/stable_kernel_rules.txt	2009-01-28 15:55:48 -08:00
kbuild	kconfig: resort the documentation of the environment variables	2009-06-09 22:37:47 +02:00
kdump	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
ko_KR	HOWTO: update misspelling and word incorrected	2007-12-17 10:33:19 -08:00
laptops	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
lguest	lguest: add support for indirect ring entries	2009-06-12 22:27:13 +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	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
mtd	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
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	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6	2009-06-15 03:02:23 -07:00
parisc	…
pcmcia	.gitignore updates	2008-10-30 11:38:45 -07:00
power	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-06-14 13:46:25 -07:00
powerpc	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6	2009-06-15 09:40:05 -07:00
prctl	generic, x86: add tests for prctl PR_GET_TSC and PR_SET_TSC	2008-04-19 19:19:55 +02:00
s390	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
scheduler	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
scsi	Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6	2009-06-17 09:50:44 -07:00
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	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-06-14 13:46:25 -07:00
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	vmscan: properly account for the number of page cache pages zone_reclaim() can reclaim	2009-06-16 19:47:45 -07:00
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	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
trace	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
uml	…
usb	trivial: usb: fix missing space typo in doc	2009-06-12 18:01:51 +02:00
video4linux	V4L/DVB (11996): saa7134: add support for AVerMedia M103 (f736)	2009-06-16 19:07:53 -03:00
vm	Documentation/vm/Makefile: don't try to build slqbinfo	2009-06-17 09:45:46 -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 'linus' into x86/mce3	2009-06-11 23:31:52 +02:00
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
BUG-HUNTING	Documentation: add hint about call traces & module symbols to BUG-HUNTING	2008-02-06 10:41:09 -08:00
Changes	Documentation/Changes: perl is needed to build the kernel	2009-06-18 13:03:46 -07:00
CodingStyle	trivial: fix typo milisecond/millisecond for documentation and source comments.	2009-06-12 18:01:46 +02:00
DMA-API.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
DMA-ISA-LPC.txt	…
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-mapping.txt	dma-mapping: update the old macro DMA_nBIT_MASK related documentations	2009-04-07 08:31:12 -07:00
HOWTO	Remove Andrew Morton's http://www.zip.com.au/~akpm/	2008-10-16 11:21:32 -07:00
IO-mapping.txt	Documentation: move DMA-mapping.txt to Doc/PCI/	2009-01-29 18:19:29 -08:00
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	…
Intel-IOMMU.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
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
SAK.txt	Remove Andrew Morton's old email accounts	2008-10-16 11:21:32 -07:00
SELinux.txt	selinux: add support for installing a dummy policy (v2)	2008-08-27 08:54:08 +10:00
SM501.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
SecurityBugs	…
Smack.txt	smack: implement logging V3	2009-04-14 09:00:23 +10:00
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 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-06-14 13:46:25 -07:00
VGA-softcursor.txt	…
applying-patches.txt	…
atomic_ops.txt	Documentation/atomic_ops.txt: fix sample code	2009-06-16 19:47:52 -07:00
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	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
bt8xxgpio.txt	gpio: add bt8xxgpio driver	2008-07-25 10:53:30 -07:00
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
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: Documentation/dell_rbu.txt: fix typos	2009-06-12 18:01:50 +02:00
devices.txt	lanana: assign a device name and numbering for MAX3100	2009-04-07 08:44:05 -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	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
eisa.txt	…
email-clients.txt	Documentation/email-clients.txt: add some info about gmail	2008-11-06 15:41:19 -08:00
exception.txt	…
feature-removal-schedule.txt	irqs: add IRQF_SAMPLE_RANDOM to the feature-removal-schedule.txt (deprecated) list	2009-06-18 13:03:40 -07:00
futex-requeue-pi.txt	futex: add requeue-pi documentation	2009-05-09 07:12:50 +02:00
gcov.txt	gcov: add gcov profiling infrastructure	2009-06-18 13:03:57 -07:00
gpio.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
highuid.txt	[SPARC]: Remove SunOS and Solaris binary support.	2008-04-21 15:10:15 -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
io-mapping.txt	io mapping: improve documentation	2008-11-03 18:21:44 +01:00
io_ordering.txt	…
iostats.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
irqflags-tracing.txt	…
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	gcov: add gcov profiling infrastructure	2009-06-18 13:03:57 -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
kmemcheck.txt	kmemcheck: add the kmemcheck documentation	2009-06-13 14:27:20 +02:00
kmemleak.txt	kmemleak: Add documentation on the memory leak detector	2009-06-11 17:03:29 +01:00
kobject.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
kprobes.txt	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -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	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
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
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	sched: Document memory barriers implied by sleep/wake-up primitives	2009-04-29 14:15:55 +02:00
memory-hotplug.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
memory.txt	…
mono.txt	…
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	…
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	…
rbtree.txt	trivial: rbtree.txt: fix rb_entry() parameters in sample code	2009-06-12 18:01:47 +02:00
rfkill.txt	rfkill: document /dev/rfkill	2009-06-03 14:06:15 -04:00
robust-futex-ABI.txt	futex: documentation: fix inconsistent description of futex list_op_pending	2009-06-18 13:03:56 -07:00
robust-futexes.txt	…
rt-mutex-design.txt	…
rt-mutex.txt	…
rtc.txt	rtc: cleanup example code	2008-02-06 10:41:14 -08:00
serial-console.txt	…
sgi-ioc4.txt	…
sgi-visws.txt	…
slow-work.txt	Document the slow work thread pool	2009-04-03 16:42:35 +01:00
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
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	…
video-output.txt	…
volatile-considered-harmful.txt	Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.	2008-07-26 12:00:06 -07:00
voyager.txt	…
zorro.txt	…