[lttng-dev] btrfs tracepoint oddity

Thibault, Daniel Daniel.Thibault at drdc-rddc.gc.ca
Thu Oct 16 09:48:42 EDT 2014

   Something odd happens when I build lttng-modules (2.5.0-9) with an enriched linux-headers package (I added the btrfs, ext3, and ext4 file system headers from the Linux source): one of the btrfs events has a strange name.

$ sudo -H lttng list -k

   This can be traced to include/trace/events/btrfs.h (in the Linux kernel source), which has:

DEFINE_EVENT(btrfs__writepage, __extent_writepage,

instead of

DEFINE_EVENT(btrfs__writepage, btrfs_extent_writepage,

   This is a minor annoyance (it does not impede LTTng from functioning) that I suppose needs to be handled upstream?  No other kernel tracepoint seems to have an out-of-joint name.

Daniel U. Thibault
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