On Mon, Feb 11, 2019 at 12:36:47PM +1100, Dave Chinner wrote: > From: Dave Chinner <dchinner@xxxxxxxxxx> > > These tests create substantial file fragmentation as a result of > application actions that defeat post-EOF preallocation > optimisations. They are intended to replicate known vectors for > these problems, and provide a check that the fragmentation levels > have been controlled. The mitigations we make may not completely > remove fragmentation (e.g. they may demonstrate speculative delalloc > related extent size growth) so the checks don't assume we'll end up > with perfect layouts and hence check for an exceptable level of > fragmentation rather than none. > > Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx> > --- Forgot to add that these tests go along with this patch series: https://marc.info/?l=linux-xfs&m=154951612101291&w=2 And can be used to test whatever way we decide to minimise fragmentation through maintianing post-EOF preallocation. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx
