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authorPeter Oberparleiter <oberpar@linux.vnet.ibm.com>2009-06-17 16:28:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-18 13:03:57 -0700
commit2521f2c228ad750701ba4702484e31d876dbc386 (patch)
tree2221de3e3de9512979b8244c6304366e3be5be63 /arch/Kconfig
parent0b923606e75f1ab672e25b14ac039a1cdcfa382f (diff)
downloadlwn-2521f2c228ad750701ba4702484e31d876dbc386.tar.gz
lwn-2521f2c228ad750701ba4702484e31d876dbc386.zip
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>
Diffstat (limited to 'arch/Kconfig')
-rw-r--r--arch/Kconfig2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index 78a35e9dc104..99193b160232 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -112,3 +112,5 @@ config HAVE_DMA_API_DEBUG
config HAVE_DEFAULT_NO_SPIN_MUTEXES
bool
+
+source "kernel/gcov/Kconfig"