Arnd Bergmann wrote: > We started discussing this in v1, but the discussion got sidetracked: > Is there a technical reason why you don't also allow 1M pages, which > may be useful in certain scenarios? > No, it was mostly a matter of the time I have had and machines easily available to me for testing. I don't know of a technical reason that would prevent supporting 1M huge pages, but would want the tests in the libhugetlbfs suite to pass, etc. > On the Cell/B.E. platforms (IBM/Mercury blades, Toshiba Celleb, PS3), the > second large page size is an option that can be set in a HID SPR > to either 64KB or 1MB. Unfortunately, we can't do these two simultaneously, > but the firmware can change the default and put it into the device tree, > or you could have the kernel override the firmware settings. > > Going a lot further, do you have plans for a fully dynamic hugepage size, > e.g. using a mount option for hugetlbfs? I can see that as rather useful, > but at the same time it's probably much more complicated than the boot time > option. > Eventually we will want to support dynamic huge page sizes. This is already being looked into. In the meantime we can have some flexibility with a boot-time parameter though.
> Arnd <>< > Jon _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
