On Mon, May 13, 2024 at 10:56:00AM +0300, Viacheslav Dubeyko wrote:
>
>
> > On May 10, 2024, at 4:40 PM, Kanchan Joshi <joshi.k@xxxxxxxxxxx> wrote:
> >
> > Flexible Data Placement (FDP), as ratified in TP 4146a, allows the host
> > to control the placement of logical blocks so as to reduce the SSD WAF.
> >
> > Userspace can send the data lifetime information using the write hints.
> > The SCSI driver (sd) can already pass this information to the SCSI
> > devices. This patch does the same for NVMe.
> >
> > Fetches the placement-identifiers (plids) if the device supports FDP.
> > And map the incoming write-hints to plids.
> >
>
>
> Great! Thanks for sharing the patch.
>
> Do we have documentation that explains how, for example, kernel-space
> file system can work with block layer to employ FDP?
>
> Do we have FDP support in QEMU already if there is no access to real
> device for testing?
I believe FDP has been in qemu for some time. Look for 73064edfb8
("hw/nvme: flexible data placement emulation [Jesper Devantier]")
best
--
Joel Granados
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