linux-kernel - Re: [RFC 0/2] virtio-pmem: Asynchronous flush

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Message-ID: <CALzYo33i5nBuPj4c3cJCZB9qEwfjypDqXf9vtn2wJdTYCFxg8g@mail.gmail.com>
Date:   Fri, 12 Mar 2021 05:21:14 +0100
From:   Pankaj Gupta <pankaj.gupta@...ud.ionos.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     Pankaj Gupta <pankaj.gupta.linux@...il.com>,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        dan.j.williams@...el.com, vishal.l.verma@...el.com,
        dave.jiang@...el.com, mst@...hat.com, jmoyer@...hat.com
Subject: Re: [RFC 0/2] virtio-pmem: Asynchronous flush

Hi David,

> >   Jeff reported preflush order issue with the existing implementation
> >   of virtio pmem preflush. Dan suggested[1] to implement asynchronous flush
> >   for virtio pmem using work queue as done in md/RAID. This patch series
> >   intends to solve the preflush ordering issue and also makes the flush
> >   asynchronous from the submitting thread POV.
> >
> >   Submitting this patch series for feeback and is in WIP. I have
> >   done basic testing and currently doing more testing.
> >
> > Pankaj Gupta (2):
> >    pmem: make nvdimm_flush asynchronous
> >    virtio_pmem: Async virtio-pmem flush
> >
> >   drivers/nvdimm/nd_virtio.c   | 66 ++++++++++++++++++++++++++----------
> >   drivers/nvdimm/pmem.c        | 15 ++++----
> >   drivers/nvdimm/region_devs.c |  3 +-
> >   drivers/nvdimm/virtio_pmem.c |  9 +++++
> >   drivers/nvdimm/virtio_pmem.h | 12 +++++++
> >   5 files changed, 78 insertions(+), 27 deletions(-)
> >
> > [1] https://marc.info/?l=linux-kernel&m=157446316409937&w=2
> >
>
> Just wondering, was there any follow up of this or are we still waiting
> for feedback? :)

Thank you for bringing this up.

My apologies I could not followup on this. I have another version in my local
tree but could not post it as I was not sure if I solved the problem
correctly. I will
clean it up and post for feedback as soon as I can.

P.S: Due to serious personal/family health issues I am not able to
devote much time
on this with other professional commitments. I feel bad that I have
this unfinished task.
Just in last one year things have not been stable for me & my family
and still not getting :(

Best regards,
Pankaj