Messages in this thread | | | Date | Wed, 13 Aug 2008 08:55:26 -0700 | From | Ulrich Drepper <> | Subject | Re: pthread_create() slow for many threads; also time to revisit 64b context switch optimization? |
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Ingo Molnar wrote: > Btw., can you see any problems with option #1: simply removing MAP_32BIT > from 64-bit stack allocations in glibc unconditionally?
Yes, as we both agree, there are still such machines out there.
The real problem is: what to do if somebody complains? If we would have the extra flag such people could be accommodated. If there is no such flag then distributions cannot just add the flag (it's part of the kernel API) and they would be caught between a rock and a hard place. Option #2 provides the biggest flexibility.
I upstream kernel truly doesn't care about such machines anymore there are two options:
- - really do nothing at all
- - at least reserve a flag in case somebody wants/has to implement option #2
- -- ➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux)
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