linux-kernel - Re: [PATCH 05/14] blk-mq: allow software queue to map to multiple hardware queues

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Date:   Mon, 29 Oct 2018 10:34:34 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/14] blk-mq: allow software queue to map to multiple
 hardware queues

On Mon, 2018-10-29 at 10:37 -0600, Jens Axboe wrote:
> The mapping used to be dependent on just the CPU location, but
> now it's a tuple of { type, cpu} instead. This is a prep patch
> for allowing a single software queue to map to multiple hardware
> queues. No functional changes in this patch.

A nitpick: mathematicians usually use the { } notation for sets and () for
tuples. See also https://en.wikipedia.org/wiki/Tuple.

> +		/* wrap */
> +		BUG_ON(!hctx->nr_ctx);

Another nitpick: how about changing the "wrap" comment into "detect integer
overflow" or so to make the purpose of the BUG_ON() statement more clear?

Thanks,

Bart.