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Unable to capture trace with -w option

I am not able to capture trace with the -w option on my fedora machine. Please see the log below : [root@localhost home]# tcpdump -w /home/trace.cap -i eth2 -s 0 tcpdump: listening on eth2, link-type ...
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XFS Tracing with Ftrace

I use a disk drive formatted with xfs.My OS is Ubuntu Server 12.04 LTS (kernel 3.11.0-22-generic). I would like to use ftrace (e.g.,trace-cmd record -e xfs\*) but under ...