site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Organization: Cluster FS 07/03/2007 13:36 +0000, Anton Altaparmakov:

On 7 Mar 2007, at 07:52, Nikita Danilov wrote:

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07/03/2007 04:37 -0800, Terry Lambert:

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On Mar 7, 2007, at 3:45 AM, Anton Altaparmakov wrote:

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(int)kerr); err = EIO;

I may be misunderstanding the simplification you performed, and if so, forgive me...

You want to call ubc_upl_map() before you do the I/O, or the UPL could have been recycled while the system was under extreme pressure, which

By the way, is there any openly available documentation on UPL interface and XNU VM internals in general?

- Really excellent book!: MAC OS X Internals by Amit Singh (http:// www.amazon.co.uk/MAC-OS-Internals-Amit-Singh/dp/0321278542/)

- http://developer.apple.com/referencelibrary/Darwin/idxKernel- date.html and in particular the Kernel Programming Guide (http:// developer.apple.com/documentation/Darwin/Conceptual/KernelProgramming/).

Thanks, Anton, I'll take a look.

- Download the xnu sources from http://www.opensource.apple.com/ darwinsource/ and look in bsd/kern/ubc_subr.c. It has very good comments above most of the function (kind of Kernel doc style like in Linux but not quite).

A couple of years ago, I used to read through osfmk/vm/ a lot, trying to understand UPL interface, hopefully it got better comments (read: any) since then. :-)

Best regards,

Anton

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