Re: [Virtio-fs] [PATCH v4 0/8] fuse,virtiofs: support per-file DAX
From: Vivek Goyal <vgoyal@redhat.com>
Date: 2021-08-17 12:49:36
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linux-fsdevel
On Tue, Aug 17, 2021 at 10:32:14AM +0100, Dr. David Alan Gilbert wrote:
* Miklos Szeredi (miklos@szeredi.hu) wrote:quoted
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.
In that case probaly we should just make DAX window larger. I assume that selecting which files to turn DAX on, will itself will not be a trivial. Not sure what heuristics are being deployed to determine that. Will like to know more about it. Vivek _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization