On Tue, Aug 17, 2021 at 10:32:14AM +0100, Dr. David Alan Gilbert wrote: > * Miklos Szeredi (mik...@szeredi.hu) wrote: > > On Tue, 17 Aug 2021 at 04:22, Jeffle Xu <jeffl...@linux.alibaba.com> wrote: > > > > > > 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
