On 06/20/2012 12:47 PM, John wrote: > Hi, > > I am trying to output to logcat when the kernel write blocks to any disk or > reads blocks from any disk I think I found the file that would do this: > > *external/e2fsprogs/lib/ext2fs/unix_io.c > *
This is not the right file. This is part of user-space library for ext2 filesystem utilities (like fsck). The kernel source code is not part of AOSP (last time I checked). Not to completely redirect you, but the kernel code is already instrumented to provide block layer statistics, and likely you can use ftrace if you need to see individual read and writes. None of this will be available via the Android logs, however (unless you do something wonky like redirect the kernel logs to the Android logs) To see the kernel log, use dmesg on the target. Or, if you're gathering data from the /proc or debug filesystems, do the appropriate file operations on target: e.g. cat /proc/diskstats It sounds like the first thing you need to do is find the source code for the kernel for your device. Next, I think it would be good for you to check out the blktrace manpage. See http://linux.die.net/man/8/blktrace -- Tim ============================= Tim Bird Architecture Group Chair, CE Workgroup of the Linux Foundation Senior Staff Engineer, Sony Network Entertainment ============================= -- unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel
