On 26.08.2013 13:39, LF.Tan wrote: > Hi all > > I am interested to enable Gcov on my platform (on a target board). I > have tried to apply the 4 patches submitted by Frantisek Hrbata. But, > the *.gcda is always empty. Note, I am using GCC 4.7.3. > > I have followed the steps in Documentation/gcov.txt. I've mounted the > NFS filesystem and it has access to the kernel build directory on host > machine.The path for the kernel source in host and target are same. > > Let said my kernel module is under drivers/misc, > drivers/misc/module.ko. Turn on Gcov in drivers/misc/Makefile. > > 1. mount -t debugfs none /sys/kernel/debug/ > 2. insmod <PATH>/module.ko > 3. Perform some actions to excute code in module.ko > 4. rmmod <PATH>/module.ko > 5. Check /sys/kernel/debug/gcov/<PATH>/drivers/misc/. There is a soft > link of module.gcno (I check the soft link is working), but > module.gcda is empty. Are you sure they are empty? .gcda files report a file size of 0 as many virtual files do, but you can read data from them nevertheless. You could try running "cat" on them to copy their contents for example. > Any step is incorrect or missing? Or anyone know how to enable GCOV on > target board? Please advice. > I would like to enable GCOV in arch/ code as well. > Thank you very much. -- Peter Oberparleiter Linux on System z Development - IBM Germany -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
