linux-kernel - Re: [RFC v2 0/2] virtio-pmem: Asynchronous flush

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Date:   Thu, 19 Aug 2021 13:08:40 +0200
From:   Pankaj Gupta <pankaj.gupta.linux@...il.com>
To:     nvdimm@...ts.linux.dev, LKML <linux-kernel@...r.kernel.org>
Cc:     Dan Williams <dan.j.williams@...el.com>, jmoyer@...hat.com,
        David Hildenbrand <david@...hat.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Pankaj Gupta <pankaj.gupta@...os.com>
Subject: Re: [RFC v2 0/2] virtio-pmem: Asynchronous flush

Gentle ping.

>
>  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 for the submitting thread.
>
>  Submitting this patch series for review. Sorry, It took me long time to
>  come back to this due to some personal reasons.
>
>  RFC v1 -> RFC v2
>  - More testing and bug fix.
>
>  [1] https://marc.info/?l=linux-kernel&m=157446316409937&w=2
>
> Pankaj Gupta (2):
>   virtio-pmem: Async virtio-pmem flush
>   pmem: enable pmem_submit_bio for asynchronous flush
>
>  drivers/nvdimm/nd_virtio.c   | 72 ++++++++++++++++++++++++++++--------
>  drivers/nvdimm/pmem.c        | 17 ++++++---
>  drivers/nvdimm/virtio_pmem.c | 10 ++++-
>  drivers/nvdimm/virtio_pmem.h | 14 +++++++
>  4 files changed, 91 insertions(+), 22 deletions(-)
>
> --
> 2.25.1
>