On Wed, Jul 30, 2014 at 5:22 PM, <Valdis.Kletnieks@vt.edu> wrote:

On Wed, 30 Jul 2014 15:06:39 -0500, Xin Tong said:

> 2. modify the kernel (maybe extensively) to allocate 2MB page by default.

How fast do you run out of memory if you do that every time you actually
only need a few 4K pages? (In other words - think what that isn't the
default behavior already :)

​I am planning to use this only for workloads with very large memory footprints, e.g. hadoop, tpcc, etc. 

BTW, i see Linux kernel uses the hugetlbfs to manage hugepages. every api call, mmap, shmget​, etc, all create a hugetlbfs before the hugepages can be allocated. why can not huge pages be allocated the same way as 4K pages ? whats the point of having the hugetlbfs. 

Xin