On Mon, Oct 22, 2012 at 6:29 PM, Andi Kleen <a...@linux.intel.com> wrote: >> Since PowerPC already allows 16GB page sizes, doesn't there need to be >> allowance for the possibility of future expansion? Choosing a larger >> minimum size (like 2^16) would allow that. Does the minimum size need >> to be 16k? (Surely, if you want a HUGEPAGE, you want a bigger page >> than that? I am not sure.) > > Some architectures have configurable huge page sizes, so it depends on > the user. I thought 16K is reasonable. Can make it larger too. > > But I personally consider even 16GB pages somewhat too big.
I do not know the answer course ;-). Just thought that it was worth emphasizing that some system already allows the upper limit you propose. It seems inevitable that some other system will allow something even bigger. Anyway, I got distracted from my earlier more important point. This proposed change will chew up most (all?) of the remaining bit-space in 'flags'. This seems like a mistake from a future extensibility point of view... It sounds a lot like you'll force someone else to write and deploy mmap3()... -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Author of "The Linux Programming Interface"; http://man7.org/tlpi/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
