Re: [Virtio-fs] [PATCH v4 0/8] fuse,virtiofs: support per-file DAX

* Miklos Szeredi (miklos@szeredi.hu) wrote:

On Tue, 17 Aug 2021 at 04:22, Jeffle Xu [off-list ref] wrote:

quoted

This patchset adds support of per-file DAX for virtiofs, which is
inspired by Ira Weiny's work on ext4[1] and xfs[2].

Can you please explain the background of this change in detail?

Why would an admin want to enable DAX for a particular virtiofs file
and not for others?

Where we're contending on virtiofs dax cache size it makes a lot of
sense; it's quite expensive for us to map something into the cache
(especially if we push something else out), so selectively DAXing files
that are expected to be hot could help reduce cache churn.

Dave

Thanks,
Miklos

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Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK

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