linux-kernel - Re: block: DMA alignment of IO buffer allocated from slab

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Message-ID: <010001660cbd51ea-56e96208-564d-4f5d-a5fb-119a938762a9-000000@email.amazonses.com>
Date:   Mon, 24 Sep 2018 18:00:25 +0000
From:   Christopher Lameter <cl@...ux.com>
To:     Jens Axboe <axboe@...nel.dk>
cc:     Christoph Hellwig <hch@....de>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Ming Lei <tom.leiming@...il.com>,
        linux-block <linux-block@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        "open list:XFS FILESYSTEM" <linux-xfs@...r.kernel.org>,
        Dave Chinner <dchinner@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ming Lei <ming.lei@...hat.com>
Subject: Re: block: DMA alignment of IO buffer allocated from slab

On Mon, 24 Sep 2018, Jens Axboe wrote:

> The situation is making me a little uncomfortable, though. If we export
> such a setting, we really should be honoring it...

Various subsystems create custom slab arrays with their particular
alignment requirement for these allocations.