Luiz, Dave, Thanks for comments. I understand that there are some exception cases which doesn't support 1G large pages on newer CPUs. I like Dave's example, at the same time I would like to add "pdpe1gb flag" in the document. For example, x86 CPUs normally support 4K and 2M (1G if pdpe1gb flag exist). Masanari On Tue, Nov 4, 2014 at 3:18 AM, Dave Hansen <dave.hansen@xxxxxxxxx> wrote: > On 10/31/2014 09:01 AM, Masanari Iida wrote: >> --- a/Documentation/vm/hugetlbpage.txt >> +++ b/Documentation/vm/hugetlbpage.txt >> @@ -2,7 +2,8 @@ >> The intent of this file is to give a brief summary of hugetlbpage support in >> the Linux kernel. This support is built on top of multiple page size support >> that is provided by most modern architectures. For example, i386 >> -architecture supports 4K and 4M (2M in PAE mode) page sizes, ia64 >> +architecture supports 4K and 4M (2M in PAE mode) page sizes, x86_64 >> +architecture supports 4K, 2M and 1G (SandyBridge or later) page sizes. ia64 >> architecture supports multiple page sizes 4K, 8K, 64K, 256K, 1M, 4M, 16M, >> 256M and ppc64 supports 4K and 16M. A TLB is a cache of virtual-to-physical >> translations. Typically this is a very scarce resource on processor. > > I wouldn't mention SandyBridge. Not all x86 CPUs are Intel. :) > > Also, what of the Intel CPUs like the Xeon Phi or the Atom cores? I > have an IvyBridge (>= Sandybridge) mobile CPU in this laptop which does > not support 1G pages. > > I would axe the i386-specific reference and just say something generic like: > > For example, x86 CPUs normally support 4K and 2M (1G sometimes). > > -- 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>