Messages in this thread | | | Subject | Re: [PATCH v6 14/17] powerpc: Add support for setting SPRN_TIDR | From | Benjamin Herrenschmidt <> | Date | Tue, 15 Aug 2017 08:25:03 +1000 |
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On Mon, 2017-08-14 at 13:03 -0700, Sukadev Bhattiprolu wrote: > As Ben pointed out, we are going to be have limit the number of TIDs (to > be within the size limits), so we won't be able to use task_pid_nr()? But > if we assign the TIDs in the RX_WIN_OPEN ioctl, then only the FTW processes > will need the TIDR value.
But you'll have to assign it for all present and future threads of that process which is somewhat hard to do without races.
> Can we then assign new, globally-unique TID values for now and have the ioctl > fail with -EAGAIN if all TIDs are in use? We can extend to per-process TID > values, later?
Why would you want to do that ?
Ben.
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