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). Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
