The output of /proc/$pid/numa_maps is in terms of number of pages like anon=22 or dirty=54. Here's some output: 7f4680000000 default file=/hugetlb/bigfile anon=50 dirty=50 N0=50 7f7659600000 default file=/anon_hugepage\040(deleted) anon=50 dirty=50 N0=50 7fff8d425000 default stack anon=50 dirty=50 N0=50 Looks like we have a stack and a couple of anonymous hugetlbfs areas page which both use the same amount of memory. They don't. The 'bigfile' uses 1GB pages and takes up ~50GB of space. The anon_hugepage uses 2MB pages and takes up ~100MB of space while the stack uses normal 4k pages. You can go over to smaps to figure out what the page size _really_ is with KernelPageSize or MMUPageSize. But, I think this is a pretty nasty and counterintuitive interface as it stands. The following patch adds a pagesize= field. Note that this only shows the kernel's notion of page size. For transparent hugepages, it still shows the base page size. Here's some real output. Note the anon_hugepage in there. # cat /proc/`pidof memknobs`/numa_maps 00400000 default file=/root/memknobs pagesize=4KiB dirty=3 active=2 N0=3 00602000 default file=/root/memknobs pagesize=4KiB anon=1 dirty=1 N0=1 00603000 default file=/root/memknobs pagesize=4KiB anon=1 dirty=1 N0=1 00604000 default heap pagesize=4KiB anon=6 dirty=6 N0=6 7f6766216000 default file=/lib/libc-2.9.so pagesize=4KiB mapped=98 mapmax=25 active=97 N0=98 7f676637e000 default file=/lib/libc-2.9.so 7f676657e000 default file=/lib/libc-2.9.so pagesize=4KiB anon=4 dirty=4 N0=4 7f6766582000 default file=/lib/libc-2.9.so pagesize=4KiB anon=1 dirty=1 N0=1 7f6766583000 default pagesize=4KiB anon=3 dirty=3 N0=3 7f6766588000 default file=/lib/ld-2.9.so pagesize=4KiB mapped=25 mapmax=24 N0=25 7f676679d000 default pagesize=4KiB anon=2 dirty=2 N0=2 7f67667a3000 default pagesize=4KiB anon=4 dirty=4 N0=4 7f67667a7000 default file=/lib/ld-2.9.so pagesize=4KiB anon=1 dirty=1 N0=1 7f67667a8000 default file=/lib/ld-2.9.so pagesize=4KiB anon=1 dirty=1 N0=1 7f6766800000 default file=/anon_hugepage\040(deleted) pagesize=2MiB anon=10 dirty=10 N0=10 7fff5b948000 default stack pagesize=4KiB anon=2 dirty=2 N0=2 7fff5b96d000 default Signed-off-by: Dave Haneen <dave@xxxxxxxxxxxxxxxxxx> --- linux-2.6.git-dave/fs/proc/task_mmu.c | 5 +++++ 1 file changed, 5 insertions(+) diff -puN fs/proc/task_mmu.c~show-page-size fs/proc/task_mmu.c --- linux-2.6.git/fs/proc/task_mmu.c~show-page-size 2011-09-30 16:41:06.125953955 -0700 +++ linux-2.6.git-dave/fs/proc/task_mmu.c 2011-09-30 16:41:06.133953941 -0700 @@ -1044,6 +1044,11 @@ static int show_numa_map(struct seq_file if (!md->pages) goto out; + /* Only interesting for hugetlbfs pages. + * Transparent hugepages are still pagesize=4k */ + seq_puts(m, " pagesize="); + seq_print_pow2(m, vma_kernel_pagesize(vma)); + if (md->anon) seq_printf(m, " anon=%lu", md->anon); _ -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>