Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway

[Miklos Szeredi]

> Am Donnerstag, 5. Juli 2007 schrieb Miklos Szeredi:
> > > > Actually fuse allows SIGKILL, because it's always fatal, and the
> > > > syscall may not be restarted.
> > > 
> > > I think you want to stick try_to_freeze() at the same places where you
> > > do SIGKILL handling. That should solve the 'syslogd is unfreezeable'
> > > problem.
> > 
> > I could, but it would not solve the general problem. ÂNamely, that the
> > presence of fuse imposes a certain ordering in which userspace tasks
> > have to be frozen. ÂAnd it is not possible to know this ordering.
> 
> Actually, why do you need this? There is no absolute need that you
> finish the request. You must either finish the request or let yourself
> be frozen.
> 
> A quick look through fuse reveals principally request_wait_answer()
> And maybe a few other places. Is there some hidden reason you cannot
> handle being frozen here?

Yes, fuse could handle being frozen there.  However that would only
solve part of the problem: an operation waiting for a reply could be
holding a VFS mutex and some other task may be blocked on that mutex.

How would you solve freezing those tasks?

Miklos
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/