Re: [PATCH] nvme: enable FDP support

[Joel Granados <j.granados@samsung.com>]

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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@samsung.com> 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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