On Fri, Sep 08, 2017 at 03:21:53PM -0600, Ross Zwisler wrote: > This adds a regression test for the following kernel patch: > > xfs: always use DAX if mount option is used > > This test will also pass with kernel v4.14-rc1 and beyond because the XFS > DAX I/O mount option has been disabled (but not removed), so the > "chattr -x" to turn off DAX doesn't actually do anything. > > Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> > Suggested-by: Christoph Hellwig <hch@xxxxxxxxxxxxx> <> > +# disable tracing, clear the existing trace buffer and turn on dax tracepoints > +echo 0 > /sys/kernel/debug/tracing/tracing_on > +echo > /sys/kernel/debug/tracing/trace > +echo 1 > /sys/kernel/debug/tracing/events/fs_dax/enable I think I can do a better job of: a) detecting whether debugfs is present, and if not just bail the test as not run b) recording the current state of the debugfs (tracing_on, fs_dax/enable), doing what I need to do, then restoring the previous state. Before I work on a v2, though, I'd love to get feedback on whether or not using tracepoints is okay in fstests. -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
