On Tue, 06 Dec 2016 14:37:54 +0530 "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx> 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 ? > Probably that would be more logical. But I'm a bit concerned about adding more stuff to /proc/meminfo from a performance point of view - that file gets read from quite frequently and we've already put some quite obscure things in there. Probably we whould be careful about this. -- 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>