On Mon, 23 Jan 2006, Grant Grundler wrote: > Would an app first need to mmap an uncached address? > Or some other obvious "marker" that might warn the kernel? I'm not sure an uncached address would be appropriate, as I believe there are other non-IO uncached mappings which can be performed (whatever the fetchop stuff morphed into, for example -- I can't remember what its called now). 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. All relevant device drivers would need to be updated, and we'd need to handle partial unmappings, shared mappings and the like. > I'm wondering if one could check some easily reachable state > (or flag) before calling platform_switch_from() and thus > mitigate Tony's concern. I can't think of any obviously correct state/flag to inspect, short of the other suggestion I made tonight. 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 - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.htmlReceived on Tue Jan 24 17:31:52 2006
This archive was generated by hypermail 2.1.8 : 2006-01-24 17:32:01 EST