Hi.
On Sat, 2007-04-07 at 11:33 +0200, Rafael J. Wysocki wrote:
> On Saturday, 7 April 2007 00:20, Nigel Cunningham wrote:
> > > > > > > - current->flags |= PF_NOFREEZE;
> > > > > > > + freezer_exempt(FE_ALL);
> > > > > > > pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
> > > > > > > if (pid > 0) {
> > > > > > > while (pid != sys_wait4(-1, NULL, 0, NULL))
> > > > > >
> > > > > > Does this mean we have userland /linuxrc running with PF_NOFREEZE?
> > > > > > That would be very bad...
> > > > >
> > > > > No, actually it is _required_ for the userland resume to work. Well, perhaps
> > > > > I should place a comment in there so that I don't have to explain this again
> > > > > and again. :-)
> > > >
> > > > Can you put big bold comment there?
> > > >
> > > > Why is it needed? Freezer never freezes _current_ task.
> > >
> > > No, it doesn't, but this task spawns linuxrc and then calls sys_wait4() in a
> > > loop.
> > >
> > > Well, actually, I'll try to plant try_to_freeze() in this loop and see if that
> > > works. If it doesn't, I'll add a comment.
> >
> > It works. I've had:
> >
> > while (pid != sys_wait4(-1, NULL, 0, NULL)) {
> > yield();
> > try_to_freeze();
> > }
> >
> > there for ages for Suspend2.
>
> OK, thanks. Is there any particular reason to place try_to_freeze() after
> yield()?
Not that I remember. I haven't touched that for years :)
Nigel
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
