linux-kernel - Re: [PATCH] Add support for usbfs zerocopy.

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Message-ID: <20160106152212.15218.qmail@stuge.se>
Date:	Wed, 6 Jan 2016 16:22:12 +0100
From:	Peter Stuge <peter@...ge.se>
To:	"Steinar H. Gunderson" <sesse@...gle.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	stern@...land.harvard.edu
Subject: Re: [PATCH] Add support for usbfs zerocopy.

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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