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
accounting	Documentation/accounting/getdelays.c intialize the variable before using it	2009-06-16 19:47:51 -07:00
acpi
aoe
arm
auxdisplay
blackfin
block	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
blockdev
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
cpu-freq	[CPUFREQ] minor correction to cpu-freq documentation	2009-06-15 11:49:42 -04:00
cpuidle
cris
crypto
development-process	docs: Encourage better changelogs in the development process document	2009-06-04 10:32:49 -06:00
device-mapper
DocBook	debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.	2009-06-15 21:30:28 -07:00
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
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
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
ia64
ide	ide: preserve Host Protected Area by default (v2)	2009-06-07 13:52:52 +02:00
infiniband
input
ioctl
isdn	isdn: extend INTERFACE.CAPI document	2009-06-08 00:45:52 -07:00
ja_JP
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
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
make
mips
misc-devices
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
netlabel
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
PCI
pcmcia
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
RCU	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +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
sh
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
spi
sysctl	vmscan: properly account for the number of page cache pages zone_reclaim() can reclaim	2009-06-16 19:47:45 -07:00
telephony
thermal
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
watchdog
wimax
x86	Merge branch 'linus' into x86/mce3	2009-06-11 23:31:52 +02:00
zh_CN
00-INDEX
applying-patches.txt
atomic_ops.txt	Documentation/atomic_ops.txt: fix sample code	2009-06-16 19:47:52 -07:00
bad_memory.txt
basic_profiling.txt
binfmt_misc.txt
braille-console.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
bt8xxgpio.txt
BUG-HUNTING
c2port.txt
cachetlb.txt
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
cpu-hotplug.txt
cpu-load.txt
cputopology.txt
credentials.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt	trivial: Documentation/dell_rbu.txt: fix typos	2009-06-12 18:01:50 +02:00
devices.txt
DMA-API.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
DMA-attributes.txt
DMA-ISA-LPC.txt
DMA-mapping.txt
dmaengine.txt
dontdiff
dynamic-debug-howto.txt
edac.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
eisa.txt
email-clients.txt
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
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
HOWTO
hw_random.txt
ics932s401
initrd.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
IO-mapping.txt
iostats.txt
IPMI.txt
IRQ-affinity.txt
IRQ.txt
irqflags-tracing.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt
kernel-docs.txt
kernel-parameters.txt	gcov: add gcov profiling infrastructure	2009-06-18 13:03:57 -07:00
keys-request-key.txt
keys.txt
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
ldm.txt
leds-class.txt
local_ops.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
lockdep-design.txt
lockstat.txt
logo.gif
logo.txt
magic-number.txt
Makefile
ManagementStyle
markers.txt
mca.txt
md.txt
memory-barriers.txt
memory-hotplug.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
memory.txt
mono.txt
mutex-design.txt
nmi_watchdog.txt
nommu-mmap.txt
numastat.txt
oops-tracing.txt
parport-lowlevel.txt
parport.txt
pi-futex.txt
pnp.txt
preempt-locking.txt
printk-formats.txt
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
SAK.txt
SecurityBugs
SELinux.txt
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
slow-work.txt
SM501.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
Smack.txt
sparse.txt
spinlocks.txt
stable_api_nonsense.txt
stable_kernel_rules.txt
SubmitChecklist
SubmittingDrivers
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
svga.txt
sysfs-rules.txt
sysrq.txt
tomoyo.txt
unaligned-memory-access.txt
unicode.txt
unshare.txt
VGA-softcursor.txt
video-output.txt
volatile-considered-harmful.txt
voyager.txt
zorro.txt