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. -- 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>