Re: [PATCH V2 4/5] nvme: quiesce namespace queue in parallel

Ismael Luceno
2022-07-06T15:38:24Z

On Tue, 7 Jun 2022 22:03:40 +0800
Ming Lei <ming.lei@redhat.com> wrote:
> On Tue, Jun 07, 2022 at 01:21:18PM +0200, Ismael Luceno wrote:
> > Hi Ming,
> >
> > Has this patch been dropped/abandoned?
>
> Hi Ismael,
>
> The whole patchset wasn't be accepted if I remember correctly, but
> finally we moved srcu out of hctx in another patchset.
>
> If you think the patch of 'nvme: quiesce namespace queue in parallel'
> is useful, please provide a bit info about your case, then we may
> figure out similar patch if it is necessary.

Chao Leng's outgoing email (lengchao@huawei.com) permission is
restricted; I got from him (through a couple of indirections):
> Hi, Ismael and Ming, The case: When the multipathing software is used,
> if one path failed, fail over to other good path may take long time.
> This is important for scenarios that require low latency and high
> reliability, such as real-time deals.
>
> This patch can fix the bug.

Same thing he said here:
https://lore.kernel.org/linux-nvme/cc732195-c053-9ce4-e1a7-e7f6dcf762ac@huawei.com/

Huawei is still looking for a solution to be merged in mainline.

--
Ismael Luceno
SUSE L3 Support