On 08/29, Oleg Nesterov wrote: > > Hmm. But I got lost a bit. Why do we need freezer_lock to set/clear > PF_FROZEN ? OK, the code below takes freezer_lock for freezing(). > Is there any other reason? Ah, at least we need it to serialize with __thaw_task() which does "if (frozen) wake_up()". Oleg.