http://bugzilla.kernel.org/show_bug.cgi?id=14972 --- Comment #6 from Theodore Tso <tytso@xxxxxxx> 2010-01-02 17:54:54 --- You need to compile kernel with CONFIG_BLK_DEV_IO_TRACE and then you need to make sure that the debugfs file system is mounted in /sys/kernel/debug, i.e.: mount -t debugfs none /sys/kernel/debug The following documentation is from 2007, so there are some newer features (and the underlying implementation has moved to using ftrace), but the basic user interface hasn't changed much: http://pdfedit.petricek.net/bt/file_download.php?file_id=17&type=bug More information: http://www.gelato.org/pdf/apr2006/gelato_ICE06apr_blktrace_brunelle_hp.pdf -- Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
