Subject: time traveling with physio
To: None <>
From: Stephan Uphoff <>
List: tech-kern
Date: 07/11/2003 14:52:26
Read operations from devices using physio will not cause
pages associated with the buffer to be marked dirty.
Because of this changed state (data read from the device) can get 
lost later.
Fortunately data loss will not happen with anonymous memory as wiring releases
any swap space owned by an anonymous page. (physio wires the pages)
This can however cause problems for programs using device reads into
mmaped files.