Re: block: DMA alignment of IO buffer allocated from slab

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Subject: Re: block: DMA alignment of IO buffer allocated from slab
From: Bart Van Assche <bvanassche@xxxxxxx>
Date: Mon, 24 Sep 2018 08:58:40 -0700
Cc: Christoph Hellwig <hch@xxxxxx>, Ming Lei <tom.leiming@xxxxxxxxx>, linux-block <linux-block@xxxxxxxxxxxxxxx>, linux-mm <linux-mm@xxxxxxxxx>, Linux FS Devel <linux-fsdevel@xxxxxxxxxxxxxxx>, "open list:XFS FILESYSTEM" <linux-xfs@xxxxxxxxxxxxxxx>, Dave Chinner <dchinner@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Christoph Lameter <cl@xxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
In-reply-to: <c844c598-be1d-bef4-fb99-09cf99571fd7@virtuozzo.com>
References: <CACVXFVOBq3L_EjSTCoiqUL1PH=HMR5EuNNQV0hNndFpGxmUK6g@mail.gmail.com> <20180920063129.GB12913@lst.de> <87h8ij0zot.fsf@vitty.brq.redhat.com> <20180923224206.GA13618@ming.t460p> <38c03920-0fd0-0a39-2a6e-70cd8cb4ef34@virtuozzo.com> <20a20568-5089-541d-3cee-546e549a0bc8@acm.org> <12eee877-affa-c822-c9d5-fda3aa0a50da@virtuozzo.com> <1537801706.195115.7.camel@acm.org> <c844c598-be1d-bef4-fb99-09cf99571fd7@virtuozzo.com>

On Mon, 2018-09-24 at 18:52 +-0300, Andrey Ryabinin wrote:
+AD4 Yes, with CONFIG+AF8-DEBUG+AF8-SLAB+AD0-y, CONFIG+AF8-SLUB+AF8-DEBUG+AF8-ON+AD0-y kmalloc() guarantees
+AD4 that result is aligned on ARCH+AF8-KMALLOC+AF8-MINALIGN boundary.

Had you noticed that Vitaly Kuznetsov showed that this is not the case? See
also https://lore.kernel.org/lkml/87h8ij0zot.fsf+AEA-vitty.brq.redhat.com/.

Thanks,

Bart.

Follow-Ups:
- Re: block: DMA alignment of IO buffer allocated from slab
  - From: Andrey Ryabinin

References:
- block: DMA alignment of IO buffer allocated from slab
  - From: Ming Lei
- Re: block: DMA alignment of IO buffer allocated from slab
  - From: Christoph Hellwig
- Re: block: DMA alignment of IO buffer allocated from slab
  - From: Vitaly Kuznetsov
- Re: block: DMA alignment of IO buffer allocated from slab
  - From: Ming Lei
- Re: block: DMA alignment of IO buffer allocated from slab
  - From: Andrey Ryabinin
- Re: block: DMA alignment of IO buffer allocated from slab
  - From: Bart Van Assche
- Re: block: DMA alignment of IO buffer allocated from slab
  - From: Andrey Ryabinin
- Re: block: DMA alignment of IO buffer allocated from slab
  - From: Bart Van Assche
- Re: block: DMA alignment of IO buffer allocated from slab
  - From: Andrey Ryabinin

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