Commit 198d1597cc5a12d04af18b69338a5b1d66ee7020
Committed by
Linus Torvalds
1 parent
0c3697118b
Exists in
ti-lsk-linux-4.1.y
and in
10 other branches
fs: proc: task_mmu: show page size in /proc/<pid>/numa_maps
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. This patch introduces 'kernelpagesize_kB' line element to /proc/<pid>/numa_maps report file in order to help identifying the size of pages that are backing memory areas mapped by a given task. This is specially useful to help differentiating between HUGE and GIGANTIC page backed VMAs. This patch is based on Dave Hansen's proposal and reviewer's follow-ups taken from the following dicussion threads: * https://lkml.org/lkml/2011/9/21/454 * https://lkml.org/lkml/2014/12/20/66 Signed-off-by: Rafael Aquini <aquini@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Dave Hansen <dave.hansen@intel.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Showing 2 changed files with 17 additions and 15 deletions Side-by-side Diff
Documentation/filesystems/proc.txt
... | ... | @@ -508,22 +508,22 @@ |
508 | 508 | |
509 | 509 | address policy mapping details |
510 | 510 | |
511 | -00400000 default file=/usr/local/bin/app kernelpagesize_kB=4 mapped=1 active=0 N3=1 | |
512 | -00600000 default file=/usr/local/bin/app kernelpagesize_kB=4 anon=1 dirty=1 N3=1 | |
513 | -3206000000 default file=/lib64/ld-2.12.so kernelpagesize_kB=4 mapped=26 mapmax=6 N0=24 N3=2 | |
514 | -320621f000 default file=/lib64/ld-2.12.so kernelpagesize_kB=4 anon=1 dirty=1 N3=1 | |
515 | -3206220000 default file=/lib64/ld-2.12.so kernelpagesize_kB=4 anon=1 dirty=1 N3=1 | |
516 | -3206221000 default kernelpagesize_kB=4 anon=1 dirty=1 N3=1 | |
517 | -3206800000 default file=/lib64/libc-2.12.so kernelpagesize_kB=4 mapped=59 mapmax=21 active=55 N0=41 N3=18 | |
511 | +00400000 default file=/usr/local/bin/app mapped=1 active=0 N3=1 kernelpagesize_kB=4 | |
512 | +00600000 default file=/usr/local/bin/app anon=1 dirty=1 N3=1 kernelpagesize_kB=4 | |
513 | +3206000000 default file=/lib64/ld-2.12.so mapped=26 mapmax=6 N0=24 N3=2 kernelpagesize_kB=4 | |
514 | +320621f000 default file=/lib64/ld-2.12.so anon=1 dirty=1 N3=1 kernelpagesize_kB=4 | |
515 | +3206220000 default file=/lib64/ld-2.12.so anon=1 dirty=1 N3=1 kernelpagesize_kB=4 | |
516 | +3206221000 default anon=1 dirty=1 N3=1 kernelpagesize_kB=4 | |
517 | +3206800000 default file=/lib64/libc-2.12.so mapped=59 mapmax=21 active=55 N0=41 N3=18 kernelpagesize_kB=4 | |
518 | 518 | 320698b000 default file=/lib64/libc-2.12.so |
519 | -3206b8a000 default file=/lib64/libc-2.12.so kernelpagesize_kB=4 anon=2 dirty=2 N3=2 | |
520 | -3206b8e000 default file=/lib64/libc-2.12.so kernelpagesize_kB=4 anon=1 dirty=1 N3=1 | |
521 | -3206b8f000 default kernelpagesize_kB=4 anon=3 dirty=3 active=1 N3=3 | |
522 | -7f4dc10a2000 default kernelpagesize_kB=4 anon=3 dirty=3 N3=3 | |
523 | -7f4dc10b4000 default kernelpagesize_kB=4 anon=2 dirty=2 active=1 N3=2 | |
524 | -7f4dc1200000 default file=/anon_hugepage\040(deleted) huge kernelpagesize_kB=2048 anon=1 dirty=1 N3=1 | |
525 | -7fff335f0000 default stack kernelpagesize_kB=4 anon=3 dirty=3 N3=3 | |
526 | -7fff3369d000 default kernelpagesize_kB=4 mapped=1 mapmax=35 active=0 N3=1 | |
519 | +3206b8a000 default file=/lib64/libc-2.12.so anon=2 dirty=2 N3=2 kernelpagesize_kB=4 | |
520 | +3206b8e000 default file=/lib64/libc-2.12.so anon=1 dirty=1 N3=1 kernelpagesize_kB=4 | |
521 | +3206b8f000 default anon=3 dirty=3 active=1 N3=3 kernelpagesize_kB=4 | |
522 | +7f4dc10a2000 default anon=3 dirty=3 N3=3 kernelpagesize_kB=4 | |
523 | +7f4dc10b4000 default anon=2 dirty=2 active=1 N3=2 kernelpagesize_kB=4 | |
524 | +7f4dc1200000 default file=/anon_hugepage\040(deleted) huge anon=1 dirty=1 N3=1 kernelpagesize_kB=2048 | |
525 | +7fff335f0000 default stack anon=3 dirty=3 N3=3 kernelpagesize_kB=4 | |
526 | +7fff3369d000 default mapped=1 mapmax=35 active=0 N3=1 kernelpagesize_kB=4 | |
527 | 527 | |
528 | 528 | Where: |
529 | 529 | "address" is the starting address for the mapping; |
fs/proc/task_mmu.c
... | ... | @@ -1557,6 +1557,8 @@ |
1557 | 1557 | for_each_node_state(nid, N_MEMORY) |
1558 | 1558 | if (md->node[nid]) |
1559 | 1559 | seq_printf(m, " N%d=%lu", nid, md->node[nid]); |
1560 | + | |
1561 | + seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10); | |
1560 | 1562 | out: |
1561 | 1563 | seq_putc(m, '\n'); |
1562 | 1564 | m_cache_vma(m, vma); |