On Thursday 22 June 2006 08:02, Benjamin Herrenschmidt wrote: > On Wed, 2006-06-21 at 01:51 +0200, Johannes Berg wrote: > > Hey, > > > > after cpu hotplug I decided to write some fake suspend routines for > > ppc64 that always fail to see what all the drivers would say... The > > first thing I saw was during the phase where all threads are stopped, > > that windfarm got a signal! > > > > Shortly after that, the fans were revved up fully but I guess that's > > expected if the wf control loop exits. > > > > So now I'm trying to see *why* it got a signal there. Any ideas? Is that > > expected with pm and windfarm just does the wrong thing there by taking > > the signal as a reason to exit the control thread? > > > > [code in question is windfarm_core.c:wf_thread_func] > > I think it's the way the freezer works ... it sends a pseudo signal to > all kernel threads who are then supposed to do something like test for > PF_FREEZE or something like that. Yes. More precisely, they are supposed to use try_to_freeze(). Please see Documentation/power/kernel_threads.txt. Greetings, Rafael
