From: Dan Williams <dan.j.williams@intel.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Vinod Koul <vinod.koul@intel.com>,
"dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>
Subject: Re: [PATCH v4 7/8] libnvdimm: Adding blk-mq support to the pmem driver
Date: Fri, 11 Aug 2017 10:59:22 -0700 [thread overview]
Message-ID: <CAPcyv4hAjm9nGCeZWpb3XiryT8Tkvvx6dVNoDuJYhD54TQ3pvQ@mail.gmail.com> (raw)
In-Reply-To: <20170811105723.GA25839@infradead.org>
On Fri, Aug 11, 2017 at 3:57 AM, Christoph Hellwig <hch@infradead.org> wrote:
> On Mon, Aug 07, 2017 at 09:39:53AM -0700, Dave Jiang wrote:
>> Adding blk-mq support to the pmem driver in addition to the direct bio
>> support.
>
> Can you explain why this is only done for pmem and not btt and nd_blk?
I'm skeptical that we can get a dma offload benefit for those drivers
since we need to metadata updates and block-window management after
each I/O. Whether those drivers would benefit from an mq conversion is
a separate question, but the driving motivation for the conversion has
been that it's easier to send a 'struct request' to a dma engine than
a bio.
_______________________________________________
Linux-nvdimm mailing list
Linux-nvdimm@lists.01.org
https://lists.01.org/mailman/listinfo/linux-nvdimm
next prev parent reply other threads:[~2017-08-11 17:57 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-07 16:39 [PATCH v4 0/8] Adding blk-mq and DMA support to pmem block driver Dave Jiang
2017-08-07 16:39 ` [PATCH v4 1/8] dmaengine: ioatdma: revert 7618d035 to allow sharing of DMA channels Dave Jiang
2017-08-07 16:39 ` [PATCH v4 2/8] dmaengine: change transaction type DMA_SG to DMA_SG_SG Dave Jiang
2017-08-10 2:15 ` Dan Williams
2017-08-10 2:20 ` Dan Williams
2017-08-10 16:22 ` Dave Jiang
2017-08-10 19:05 ` Dan Williams
2017-08-10 19:44 ` Dave Jiang
2017-08-10 20:09 ` Dan Williams
2017-08-07 16:39 ` [PATCH v4 3/8] dmaengine: Add DMA_MEMCPY_SG transaction op Dave Jiang
2017-08-08 13:16 ` Sinan Kaya
2017-08-08 15:58 ` Dave Jiang
2017-08-07 16:39 ` [PATCH v4 4/8] dmaengine: add verification of DMA_MEMSET_SG in dmaengine Dave Jiang
2017-08-10 2:24 ` Dan Williams
2017-08-27 11:16 ` Vinod Koul
2017-08-07 16:39 ` [PATCH v4 5/8] dmaengine: ioatdma: dma_prep_memcpy_sg support Dave Jiang
2017-08-07 16:39 ` [PATCH v4 6/8] dmaengine: add SG support to dmaengine_unmap Dave Jiang
2017-08-10 2:44 ` Dan Williams
2017-08-07 16:39 ` [PATCH v4 7/8] libnvdimm: Adding blk-mq support to the pmem driver Dave Jiang
2017-08-11 10:57 ` Christoph Hellwig
2017-08-11 17:18 ` Dave Jiang
2017-08-11 17:59 ` Dan Williams [this message]
2017-08-07 16:39 ` [PATCH v4 8/8] libnvdimm: add DMA support for pmem blk-mq Dave Jiang
2017-08-11 11:04 ` Christoph Hellwig
2017-08-11 18:01 ` Dave Jiang
2017-08-11 17:54 ` [PATCH v4 0/8] Adding blk-mq and DMA support to pmem block driver Elliott, Robert (Persistent Memory)
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAPcyv4hAjm9nGCeZWpb3XiryT8Tkvvx6dVNoDuJYhD54TQ3pvQ@mail.gmail.com \
--to=dan.j.williams@intel.com \
--cc=dmaengine@vger.kernel.org \
--cc=hch@infradead.org \
--cc=linux-nvdimm@lists.01.org \
--cc=vinod.koul@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.