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Re: [PATCH] Add support for usbfs zerocopy.

From Peter Stuge <peter@stuge.se>
Newsgroups linux.kernel
Subject Re: [PATCH] Add support for usbfs zerocopy.
Date 2016-01-06 16:30 +0100
Message-ID <qNYca-2Y2-25@gated-at.bofh.it> (permalink)
References <qNHuF-9l-13@gated-at.bofh.it> <qNJGa-1vi-17@gated-at.bofh.it> <qNQ4W-5Yl-11@gated-at.bofh.it> <qNXzs-2po-5@gated-at.bofh.it>
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Steinar H. Gunderson wrote:
> > Our interface for zero copy reads/writes is O_DIRECT, and that requires
> > not special memory allocation, just proper alignment.
> 
> But that assumes you are using I/O using read()/write(). There's no way you
> can shoehorn USB isochronous reads into the read() interface, O_DIRECT or not.

How about aio?


//Peter
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Thread

Does vm_operations_struct require a .owner field? Alan Stern <stern@rowland.harvard.edu> - 2016-01-05 17:30 +0100
  Re: Does vm_operations_struct require a .owner field? "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-01-05 22:00 +0100
    Re: Does vm_operations_struct require a .owner field? Alan Stern <stern@rowland.harvard.edu> - 2016-01-05 22:40 +0100
      Re: Does vm_operations_struct require a .owner field? "Steinar H. Gunderson" <sesse@google.com> - 2016-01-06 01:00 +0100
      [PATCH] Add support for usbfs zerocopy. "Steinar H. Gunderson" <sesse@google.com> - 2016-01-06 01:00 +0100
        Re: [PATCH] Add support for usbfs zerocopy. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-01-06 01:20 +0100
          Re: [PATCH] Add support for usbfs zerocopy. "Steinar H. Gunderson" <sesse@google.com> - 2016-01-06 01:30 +0100
          [PATCH v2] Add support for usbfs zerocopy. "Steinar H. Gunderson" <sesse@google.com> - 2016-01-06 01:30 +0100
            Re: [PATCH v2] Add support for usbfs zerocopy. Lingzhu Xiang <lingzhu.xiang@mail.utoronto.ca> - 2016-01-07 03:40 +0100
              Re: [PATCH v2] Add support for usbfs zerocopy. Alan Stern <stern@rowland.harvard.edu> - 2016-01-07 16:50 +0100
                Re: [PATCH v2] Add support for usbfs zerocopy. Oliver Neukum <oneukum@suse.com> - 2016-01-11 12:20 +0100
                Re: [PATCH v2] Add support for usbfs zerocopy. Oliver Neukum <oneukum@suse.com> - 2016-01-12 11:10 +0100
            Re: [PATCH v2] Add support for usbfs zerocopy. Lingzhu Xiang <lingzhu.xiang@mail.utoronto.ca> - 2016-01-09 05:20 +0100
              Re: [PATCH v2] Add support for usbfs zerocopy. "Steinar H. Gunderson" <sesse@google.com> - 2016-01-09 12:00 +0100
        Re: [PATCH] Add support for usbfs zerocopy. Christoph Hellwig <hch@infradead.org> - 2016-01-06 07:50 +0100
          Re: [PATCH] Add support for usbfs zerocopy. "Steinar H. Gunderson" <sesse@google.com> - 2016-01-06 15:50 +0100
            Re: [PATCH] Add support for usbfs zerocopy. Peter Stuge <peter@stuge.se> - 2016-01-06 16:30 +0100
              Re: [PATCH] Add support for usbfs zerocopy. "Steinar H. Gunderson" <sesse@google.com> - 2016-01-06 16:40 +0100
              Re: [PATCH] Add support for usbfs zerocopy. Alan Stern <stern@rowland.harvard.edu> - 2016-01-06 16:40 +0100
            Re: [PATCH] Add support for usbfs zerocopy. Alan Stern <stern@rowland.harvard.edu> - 2016-01-06 16:40 +0100
              Re: [PATCH] Add support for usbfs zerocopy. Christoph Hellwig <hch@infradead.org> - 2016-01-08 10:50 +0100
                RE: [PATCH] Add support for usbfs zerocopy. David Laight <David.Laight@ACULAB.COM> - 2016-01-08 11:30 +0100
                Re: [PATCH] Add support for usbfs zerocopy. Oliver Neukum <oneukum@suse.com> - 2016-01-08 17:10 +0100
                Re: [PATCH] Add support for usbfs zerocopy. "Steinar H. Gunderson" <sesse@google.com> - 2016-01-12 22:30 +0100
                Re: [PATCH] Add support for usbfs zerocopy. Alan Stern <stern@rowland.harvard.edu> - 2016-01-12 23:10 +0100
                Re: [PATCH] Add support for usbfs zerocopy. Lingzhu Xiang <lingzhu.xiang@mail.utoronto.ca> - 2016-01-13 08:10 +0100
                Re: [PATCH] Add support for usbfs zerocopy. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-01-13 18:30 +0100
            Re: [PATCH] Add support for usbfs zerocopy. Christoph Hellwig <hch@infradead.org> - 2016-01-08 10:50 +0100

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