On Tue, Dec 06, 2016 at 07:14:50AM -0800, Dave Hansen wrote: > On 12/06/2016 01:07 AM, Aneesh Kumar K.V wrote: > > Hugh Dickins <hughd@xxxxxxxxxx> writes: > > > >> Test programs want to know the size of a transparent hugepage. > >> While it is commonly the same as the size of a hugetlbfs page > >> (shown as Hugepagesize in /proc/meminfo), that is not always so: > >> powerpc implements transparent hugepages in a different way from > >> hugetlbfs pages, so it's coincidence when their sizes are the same; > >> and x86 and others can support more than one hugetlbfs page size. > >> > >> Add /sys/kernel/mm/transparent_hugepage/hpage_pmd_size to show the > >> THP size in bytes - it's the same for Anonymous and Shmem hugepages. > >> Call it hpage_pmd_size (after HPAGE_PMD_SIZE) rather than hpage_size, > >> in case some transparent support for pud and pgd pages is added later. > > > > We have in /proc/meminfo > > > > Hugepagesize: 2048 kB > > > > Does it makes it easy for application to find THP page size also there ? > > Nope. That's the default hugetlbfs page size. Even on x86, that can be > changed and _could_ be 1G. If hugetlbfs is configured out, you also > won't get this in meminfo. I think Aneesh propose to add one more line into the file. -- Kirill A. Shutemov -- 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>