Hi All, Sorry for the wide distribution:
According to LTP page info, http://ltp.sourceforge.net/coverage/gcov.php http://ltp.sourceforge.net/coverage/lcov.php My question is How to get kernel coverage when I run LTP test? Since we do not have direct GCOV support on ARM I have enabled ( just for experiment) $ git diff kernel/gcov/Kconfig diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig index d4da55d..fceac85 100644 --- a/kernel/gcov/Kconfig +++ b/kernel/gcov/Kconfig @@ -35,7 +35,7 @@ config GCOV_KERNEL config GCOV_PROFILE_ALL bool "Profile entire Kernel" depends on GCOV_KERNEL - depends on SUPERH || S390 || X86 || PPC || MICROBLAZE + depends on SUPERH || S390 || X86 || PPC || MICROBLAZE || ARM default n ---help--- This options activates profiling for the entire kernel. I have enabled below kernel config and built the kernel. CONFIG_GCOV_KERNEL=y CONFIG_GCOV_PROFILE_ALL=y CONFIG_GCOV_FORMAT_AUTODETECT=y of course I have disabled gcov on below folders and files, because since it is an experiment i would like to be on safe side - arch/arm/mm/ - arch/arm/kernel/ - arch/arm/boot/ - arch/arm/boot/compressed/ - arch/arm/boot/bootp/ - arch/arm/boot/dts Arndale booted with this configuration successfully. Took more than 65 seconds to finish boot. gcov related files are found under /sys/ similer to X86 machine. And gcov supporting files filename.gcda are having links to kernel source root@linaro-developer:~# ls /sys/kernel/debug/gcov/ reset tmp root@linaro-developer:~# root@linaro-developer:~# ls /sys/kernel/debug/gcov/tmp/ linux-linaro-3.13-2014.01 root@linaro-developer:~# ls /sys/kernel/debug/gcov/tmp/linux-linaro-3.13-2014.01/ arch block crypto drivers fs init ipc kernel lib mm security virt root@linaro-developer:~# ls /sys/kernel/debug/gcov/tmp/linux-linaro-3.13-2014.01/kernel/time.* -l -rw------- 1 root root 0 Jan 1 1970 /sys/kernel/debug/gcov/tmp/linux-linaro-3.13-2014.01/kernel/time.gcda lrwxrwxrwx 1 root root 0 Jan 1 1970 /sys/kernel/debug/gcov/tmp/linux-linaro-3.13-2014.01/kernel/time.gcno -> /tmp/linux-linaro-3.13-2014.01/kernel/time.gcno root@linaro-developer:~# Source are placed under /tmp/ root@linaro-developer:/tmp/linux-linaro-3.13-2014.01# ls kernel/time.* -l -rw-rw-r-- 1 linaro linaro 19233 Jan 24 2014 kernel/time.c -rw-rw-r-- 1 linaro linaro 12768 Feb 13 2014 kernel/time.gcno -rw-rw-r-- 1 linaro linaro 136444 Feb 13 2014 kernel/time.o root@linaro-developer:/tmp/linux-linaro-3.13-2014.01# root@linaro-developer:/tmp/linux-linaro-3.13-2014.01# gcov kernel/gcov/base.c -o /sys/kernel/debug/gcov/tmp/linux-linaro-3.13-2014.01/kernel/gcov/ File 'kernel/gcov/base.c' Lines executed:43.18% of 44 Creating 'base.c.gcov' root@linaro-developer:/tmp/linux-linaro-3.13-2014.01# The above experiment gives coverage of a single file base.c when i run gcov manually. Is there any way to get Linux kernel coverage of all files after running LTP test cases ? Thanks in advance. Best regards Naresh Kamboju -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
