On Sat, 10 Feb 2007, Nigel Cunningham wrote: > Hi. > > On Fri, 2007-02-09 at 17:04 +0100, Oliver Neukum 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... Alan Stern
