Re: [PATCH] SN2 user-MMIO CPU migration

From: Brent Casavant <bcasavan_at_sgi.com>
Date: 2006-01-25 03:52:38
On Mon, 23 Jan 2006, Grant Grundler wrote:

> On Tue, Jan 24, 2006 at 12:30:42AM -0600, Brent Casavant wrote:
> > The only obvious marker I can thing of would be a flag in the
> > mm struct set by a device driver when such a mapping occurs.
> 
> Device driver? Your original email only talks about user space:
> http://marc.theaimsgroup.com/?l=linux-ia64&m=113771591308925&w=2

Right.  But the whole situation occurs when user space mmap()s
an IO device (e.g. a PCI aperture).  That mmap() call triggers
kernel device driver mmap code to take place, and that is where
the flag would need to be set.

Sorry I wasn't clear about that.

Brent

-- 
Brent Casavant                          All music is folk music.  I ain't
bcasavan@sgi.com                        never heard a horse sing a song.
Silicon Graphics, Inc.                    -- Louis Armstrong
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Received on Wed Jan 25 03:53:31 2006

This archive was generated by hypermail 2.1.8 : 2006-01-25 03:53:39 EST