On Tuesday, 13 February 2007 11:18, Pavel Machek wrote: > Hi! > > > > > > can there be running aio requests if all tasks are frozen? > > > > > > > > Since tasks are frozen, no new aio requests would be submitted. We do a > > > > sync to ssek to complete existing requests; I haven't looked to see > > > > whether that would need extending to flush aio as well, but don't think > > > > that would be the case. Given everyone else's silence, so far, you might > > > > be better to ask the author(s) of the aio code. > > > > > > I believe Nigel is basically correct. However sync will only flush aio > > > for block devices. Other types of aio will remain active. > > > > > > aio callbacks are interrupt-driven and execute in a workqueue (see > > > fs/aio.c), and as far as I can tell that workqueue doesn't freeze. > > > Unless some general facility freezes all workqueues... > > > > No, workqueues are not frozen unless they are explicitly declared as > > freezeable. Which currently is only done by XFS, AFAIKS. > > Ok, then we have a bug in swsusp. Can someone locate _which_ workqueue > is used for aio... and make it freezeable? Hm, so AIO is not needed for saving the image regardless of the system configuration? Rafael
