linux-kernel - RE: [PATCH RFT] blk-mq: optimize queue tag busy iter for shared

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Date:   Wed, 22 Dec 2021 17:36:51 +0530
From:   Kashyap Desai <kashyap.desai@...adcom.com>
To:     John Garry <john.garry@...wei.com>, axboe@...nel.dk
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        ming.lei@...hat.com,
        Sathya Prakash Veerichetty <sathya.prakash@...adcom.com>
Subject: RE: [PATCH RFT] blk-mq: optimize queue tag busy iter for shared_tags

>
> On 22/12/2021 11:20, Kashyap Desai wrote:
> > Yes, above is the same changes I was looking for. I did very basic
> > mistake.
> > I applied your above commit while doing megaraid_sas testing.
> >   While I move to mpi3mr testing, I did not apply your patch set.
>
> But I did not think that my patch would help mpi3mr since it does not use
> host_tagset.

Internally we are testing performance check for mpi3mr. We want to make sure
performance is not impacted due to shared host_tagset before we apply the
feature.

>
> > We can drop
> > request of this RFT since I tested above series and it serve the same
> > purpose.
>
> ok, fine.
>
> And just to confirm, do you now think that we need to fix any older kernel
> with some backport of my changes? I think that we would just need to
> consider 5.16 (when it becomes stable), 5.15, and and 5.10

It need full patch set (below) + associated fixes.
[1] " blk-mq: Use shared tags for shared sbitmap support" Commit -
e155b0c238b20f0a866f4334d292656665836c8a

Below commit cannot go to stable without [1].
https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?h=for-5.17/block&id=fea9f92f1748083cb82049ed503be30c3d3a9b69

I am not sure if stable requirement fits in this case. I mean large
patch-set is OK ?

Kashyap
>
> Thanks,
> John

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