Re: [PATCH] btrfs: Implement lazytime

[David Sterba]

On Wed, Jan 15, 2020 at 10:45:36PM +0900, Kusanagi Kouichi wrote:
> On 2020-01-14 22:21:07 +0100, David Sterba wrote:
> > On Tue, Jan 14, 2020 at 05:53:24PM +0900, Kusanagi Kouichi wrote:
> > > I tested with xfstests and lazytime didn't cause any new failures.
> > 
> > The changelog should describe what the patch does (the 'why' part too,
> > but this is obvious from the subject in this case). That fstests pass
> > without new failures is nice but there should be a specific test for
> > that or instructions in the changelog how to test.
> 
> To test lazytime, I set the following variables:
> TEST_FS_MOUNT_OPTS="-o lazytime,space_cache=v2"
> MOUNT_OPTIONS="-o lazytime,space_cache=v2"

How did you verify that the lazy time updates were applied properly?