diff options
| -rw-r--r-- | Documentation/dev-tools/kcov.rst (renamed from Documentation/kcov.txt) | 84 | ||||
| -rw-r--r-- | Documentation/dev-tools/tools.rst | 1 |
2 files changed, 43 insertions, 42 deletions
diff --git a/Documentation/kcov.txt b/Documentation/dev-tools/kcov.rst index 779ff4ab1c1d..aca0e27ca197 100644 --- a/Documentation/kcov.txt +++ b/Documentation/dev-tools/kcov.rst @@ -12,38 +12,38 @@ To achieve this goal it does not collect coverage in soft/hard interrupts and instrumentation of some inherently non-deterministic parts of kernel is disbled (e.g. scheduler, locking). -Usage: -====== +Usage +----- -Configure kernel with: +Configure the kernel with:: CONFIG_KCOV=y CONFIG_KCOV requires gcc built on revision 231296 or later. -Profiling data will only become accessible once debugfs has been mounted: +Profiling data will only become accessible once debugfs has been mounted:: mount -t debugfs none /sys/kernel/debug -The following program demonstrates kcov usage from within a test program: - -#include <stdio.h> -#include <stddef.h> -#include <stdint.h> -#include <stdlib.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <sys/ioctl.h> -#include <sys/mman.h> -#include <unistd.h> -#include <fcntl.h> - -#define KCOV_INIT_TRACE _IOR('c', 1, unsigned long) -#define KCOV_ENABLE _IO('c', 100) -#define KCOV_DISABLE _IO('c', 101) -#define COVER_SIZE (64<<10) - -int main(int argc, char **argv) -{ +The following program demonstrates kcov usage from within a test program:: + + #include <stdio.h> + #include <stddef.h> + #include <stdint.h> + #include <stdlib.h> + #include <sys/types.h> + #include <sys/stat.h> + #include <sys/ioctl.h> + #include <sys/mman.h> + #include <unistd.h> + #include <fcntl.h> + + #define KCOV_INIT_TRACE _IOR('c', 1, unsigned long) + #define KCOV_ENABLE _IO('c', 100) + #define KCOV_DISABLE _IO('c', 101) + #define COVER_SIZE (64<<10) + + int main(int argc, char **argv) + { int fd; unsigned long *cover, n, i; @@ -83,24 +83,24 @@ int main(int argc, char **argv) if (close(fd)) perror("close"), exit(1); return 0; -} - -After piping through addr2line output of the program looks as follows: - -SyS_read -fs/read_write.c:562 -__fdget_pos -fs/file.c:774 -__fget_light -fs/file.c:746 -__fget_light -fs/file.c:750 -__fget_light -fs/file.c:760 -__fdget_pos -fs/file.c:784 -SyS_read -fs/read_write.c:562 + } + +After piping through addr2line output of the program looks as follows:: + + SyS_read + fs/read_write.c:562 + __fdget_pos + fs/file.c:774 + __fget_light + fs/file.c:746 + __fget_light + fs/file.c:750 + __fget_light + fs/file.c:760 + __fdget_pos + fs/file.c:784 + SyS_read + fs/read_write.c:562 If a program needs to collect coverage from several threads (independently), it needs to open /sys/kernel/debug/kcov in each thread separately. diff --git a/Documentation/dev-tools/tools.rst b/Documentation/dev-tools/tools.rst index d4bbda319e79..9dcd0236a1ff 100644 --- a/Documentation/dev-tools/tools.rst +++ b/Documentation/dev-tools/tools.rst @@ -16,3 +16,4 @@ whole; patches welcome! coccinelle sparse + kcov |