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When reading pagemaps, we read it from specific position. To do it, we called lseek, then read. Fortunetely, there's a syscall that does both things in one call -- pread. Since we don't need to keep pagemap's position for further reads, it perfectly suits our needs. This removes 75% of lseek calls when dumping basic container. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
criu ==== An utility to checkpoint/restore tasks. Using this tool, you can freeze a running application (or part of it) and checkpoint it to a hard drive as a collection of files. You can then use the files to restore and run the application from the point it was frozen at. The distinctive feature of the CRIU project is that it is mainly implemented in user space. The project home is at http://criu.org Pages worth starting with are * Kernel configuration, compilation, etc: http://criu.org/Installation * A simple example of usage: http://criu.org/Simple_loop * More sophisticated example with graphical app: http://criu.org/VNC