linux-kernel - Re: [PATCH] dmapool: push new blocks in ascending order

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Message-ID: <Y/UHOohEMg+oyO8j@infradead.org>
Date:   Tue, 21 Feb 2023 10:02:34 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Keith Busch <kbusch@...a.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Keith Busch <kbusch@...nel.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: Re: [PATCH] dmapool: push new blocks in ascending order

On Tue, Feb 21, 2023 at 08:54:00AM -0800, Keith Busch wrote:
> From: Keith Busch <kbusch@...nel.org>
> 
> Some users of the dmapool need their allocations to happen in ascending
> order. The recent optimizations pushed the blocks in reverse order, so
> restore the previous behavior by linking the next available block from
> low-to-high.

Who are those users?

Also should we document this behavior somewhere so that it isn't
accidentally changed again some time in the future?