On Mon, 2017-08-14 at 17:02 +1000, Michael Neuling wrote: > > +/* > > + * We need to assign an unique thread id to each thread in a process. This > > + * thread id is intended to be used with the Fast Thread-wakeup (aka Core- > > + * to-core wakeup) mechanism being implemented on top of Virtual > > Accelerator > > + * Switchboard (VAS). > > + * > > + * To get a unique thread-id per process we could simply use task_pid_nr() > > + * but the problem is that task_pid_nr() is not yet available for the > > thread > > + * when copy_thread() is called. Fixing that would require changing more > > + * intrusive arch-neutral code in code path in copy_process()?. > > + * > > + * Further, to assign unique thread ids within each process, we need an > > + * atomic field (or an IDR) in task_struct, which again intrudes into the > > + * arch-neutral code. > > Really? > > > + * So try to assign globally unique thraed ids for now. > > Yuck!
Also CAPI has size limits for the TIDR afaik Ben.