On Tue, 25 Jul 2006, Rafael J. Wysocki wrote: > VIII. Saving and loading the suspend image > > The suspend image is saved to a swap partition in step (7) of the > suspend-resume cycle and loaded from it in step (9) with the help of standard > block IO callbacks and/or functions designed for accessing swap devices and/or > swap files. This code has not changed for a long time, but recently Andrew > Morton has made it use asynchronous IO (the patches are waiting in the -mm > tree now). > > There are almost no problems with this part of swsusp. There have been only > a couple of minor bugs found in it, and fixed, for the last 6 months. Yet, > it has one major limitation which is that it can only use swap partitions > for saving the suspend image and only one swap partition can be used at a > time. To overcome this limitation I am considering the addition of support > for swap files to this part of swsusp. The disk I/O while reading or writing the image is very slow. In fact, it sounds like it's going one sector at a time. Can it be sped up? Do the AIO changes accomplish that? Alan Stern
