On Tuesday, 13 February 2007 11:17, 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... > > If this is so... we need to make that particular workqueue > freezeable. (And we should really make most workqueues freezeable). Except for the ones that are needed to save the image. Do we know which ones they are? Rafael
