Hello, On Tue, Jul 09, 2024 at 08:55:43PM +0100, Pavel Begunkov wrote: ... > > > CRIU, I assume. I'll try it ... > > > > Than I think we can forget about task_works and this patch. CRIU dumps > > the tasks in TASK_TRACED state. > > And would be hard to test, io_uring (the main source of task_work) > is not supported > > (00.466022) Error (criu/proc_parse.c:477): Unknown shit 600 (anon_inode:[io_uring]) > ... > (00.467642) Unfreezing tasks into 1 > (00.467656) Unseizing 15488 into 1 > (00.468149) Error (criu/cr-dump.c:2111): Dumping FAILED. Yeah, the question is: If CRIU is to use cgroup freezer to freeze the tasks and then go around tracing each to make dump, would the freezer be enough in avoiding interim state changes? Using CRIU implementation is a bit arbitrary but I think checkpoint-restart is a useful bar to measure what should stay stable while a cgroup is frozen. Thanks. -- tejun
