linux-kernel - Re: [PATCH] btrfs: Implement lazytime

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Date:   Wed, 15 Jan 2020 17:31:28 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Kusanagi Kouichi <slash@...auone-net.jp>
Cc:     dsterba@...e.cz, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] btrfs: Implement lazytime

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?