linux-kernel - Re: [PATCH] nvme: remove multipath module parameter

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Message-ID: <20250310132931.GB8956@lst.de>
Date: Mon, 10 Mar 2025 14:29:31 +0100
From: Christoph Hellwig <hch@....de>
To: Nilay Shroff <nilay@...ux.ibm.com>
Cc: Keith Busch <kbusch@...nel.org>, Christoph Hellwig <hch@....de>,
	Hannes Reinecke <hare@...e.de>, Sagi Grimberg <sagi@...mberg.me>,
	John Meneghini <jmeneghi@...hat.com>, bmarzins@...hat.com,
	Bryan Gurney <bgurney@...hat.com>, linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Marco Patalano <mpatalan@...hat.com>,
	axboe@...nel.dk
Subject: Re: [PATCH] nvme: remove multipath module parameter

On Sun, Mar 09, 2025 at 10:53:19PM +0530, Nilay Shroff wrote:
> Yes agreed however it seems advantages of using an indirect call outweighs 
> using the short cut to blk_mq_submit_bio. Moreover it seems the cost of 
> indirect call is trivial because we already cache the nexthop. 

Indirect calls are never cheap unfortunately.

> If you and Christoph are busy with other work then in that case I'll be 
> glad to pursue this further if you agree.

I'm not working in this area at the moment, so from my POV feel free
to go ahead.