path: root/Documentation/gcov.txt
AgeCommit message (Collapse)Author
2009-09-21trivial: fix typo in CONFIG_DEBUG_FS in gcov docMarton Nemeth
The correct name is CONFIG_DEBUG_FS, add the missing underscore. Signed-off-by: Marton Nemeth <> Signed-off-by: Jiri Kosina <>
2009-06-30gcov: fix documentationPeter Oberparleiter
Commonly available versions of cp and tar don't work well with special files created using seq_file. Mention this problem in the gcov documentation and update the helper script example to work around these problems. Signed-off-by: Peter Oberparleiter <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2009-06-18gcov: add gcov profiling infrastructurePeter Oberparleiter
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] Signed-off-by: Peter Oberparleiter <> Cc: Andi Kleen <> Cc: Huang Ying <> Cc: Li Wei <W.Li@Sun.COM> Cc: Michael Ellerman <> Cc: Ingo Molnar <> Cc: Heiko Carstens <> Cc: Martin Schwidefsky <> Cc: Rusty Russell <> Cc: WANG Cong <> Cc: Sam Ravnborg <> Cc: Jeff Dike <> Cc: Al Viro <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>