Re: [patch 128/197] freezer: add try_to_freeze calls to all kernel threads

[Stefan Richter <stefanr@s5r6.in-berlin.de>]

Gautham R Shenoy wrote:
> freezer_exempt() as of now does what its name says. I.e, exempt the
> thread from all kinds of freeze chills.
> 
> But with more subsystems using the process freezer, the exemption needs
> to be event specific. There may be threads which should not be frozen 
> for say kprobes, should be frozen for cpu-hotplug. This selective
> freezing is not yet available. But it will be soon...

Thanks for the (necessary!) clarification.
Let me point out that the usual process would be to replace

	freezer_exempt(current);
	for (;;) {
		...;
by
	freezer_exempt_for_io(current);
	for (;;) {
		try_to_freeze();
		...;

when or after freezer_exempt_for_io was implemented.

But as it was submitted now, we are temporarily left with

	freezer_exempt(current);
	for (;;) {
		try_to_freeze();  /* useless irritating no-op */
		...;

without any benefit.  (And this explanatory comment ^^^ wasn't even
added; we only have the git log as explanation.)

As subsystem maintainer I have to trust now that "soon" actually means
"soon" and not "RSN"; otherwise my responsibility would be to send a NAK.
-- 
Stefan Richter
-=====-=-=== -=-= -=--=
http://arcgraph.de/sr/