http://bugzilla.kernel.org/show_bug.cgi?id=14972 Eric Sandeen <sandeen@xxxxxxxxxx> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |sandeen@xxxxxxxxxx --- Comment #10 from Eric Sandeen <sandeen@xxxxxxxxxx> 2010-01-04 03:35:22 --- (In reply to comment #9) > grep BLK.*TRACE /usr/src/linux/.config > > CONFIG_BLK_DEV_IO_TRACE=y > > Yes, I'm running under root. SeLinux is disabled in the kernel. I've no idea > what to do :( Drop the echos. Just mounting debugfs & running blktrace will suffice: [root@inode ~]# mount -t debugfs none /sys/kernel/debug/ [root@inode ~]# blktrace /dev/sda ^C=== sda === CPU 0: 0 events, 0 KiB data CPU 1: 1 events, 1 KiB data Total: 1 events (dropped 0), 1 KiB data but if you do this first: [root@inode ~]# echo blk > /sys/kernel/debug/tracing/current_tracer [root@inode ~]# echo 1 > /sys/block/sda/sda3/trace/enable you get the -EBUSY: [root@inode ~]# blktrace /dev/sda BLKTRACESETUP(2) /dev/sda failed: 16/Device or resource busy Thread 1 failed open /sys/kernel/debug/block/(null)/trace1: 2/No such file or directory Thread 0 failed open /sys/kernel/debug/block/(null)/trace0: 2/No such file or directory FAILED to start thread on CPU 0: 1/Operation not permitted FAILED to start thread on CPU 1: 1/Operation not permitted It's not related to selinux. -Eric -- 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
