On Tue, Apr 1, 2014 at 5:01 PM, Davidlohr Bueso <davidlohr@xxxxxx> wrote: > On Tue, 2014-04-01 at 15:51 -0400, KOSAKI Motohiro wrote: >> >> So, I personally like 0 byte per default. >> > >> > If by this you mean 0 bytes == unlimited, then I agree. It's less harsh >> > then removing it entirely. So instead of removing the limit we can just >> > set it by default to 0, and in newseg() if shm_ctlmax == 0 then we don't >> > return EINVAL if the passed size is great (obviously), otherwise, if the >> > user _explicitly_ set it via sysctl then we respect that. Andrew, do you >> > agree with this? If so I'll send a patch. >> >> Yes, my 0 bytes mean unlimited. I totally agree we shouldn't remove the knob >> entirely. > > Hmmm so 0 won't really work because it could be weirdly used to disable > shm altogether... we cannot go to some negative value either since we're > dealing with unsigned, and cutting the range in half could also hurt > users that set the limit above that. So I was thinking of simply setting > SHMMAX to ULONG_MAX and be done with it. Users can then set it manually > if they want a smaller value. > > Makes sense? I don't think people use 0 for disabling. but ULONG_MAX make sense to me too. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>