The patch titled
Subject: fs: proc: task_mmu: show page size in /proc/<pid>/numa_maps
has been removed from the -mm tree. Its filename was
fs-proc-task_mmu-show-page-size-in-proc-pid-numa_maps.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Rafael Aquini <aquini@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/filesystems/proc.txt | 30 +++++++++++++--------------
fs/proc/task_mmu.c | 2 +
2 files changed, 17 insertions(+), 15 deletions(-)
diff -puN Documentation/filesystems/proc.txt~fs-proc-task_mmu-show-page-size-in-proc-pid-numa_maps Documentation/filesystems/proc.txt
--- a/Documentation/filesystems/proc.txt~fs-proc-task_mmu-show-page-size-in-proc-pid-numa_maps
+++ a/Documentation/filesystems/proc.txt
@@ -508,22 +508,22 @@ summarized separated by blank spaces, on
address policy mapping details
-00400000 default file=/usr/local/bin/app kernelpagesize_kB=4 mapped=1 active=0 N3=1
-00600000 default file=/usr/local/bin/app kernelpagesize_kB=4 anon=1 dirty=1 N3=1
-3206000000 default file=/lib64/ld-2.12.so kernelpagesize_kB=4 mapped=26 mapmax=6 N0=24 N3=2
-320621f000 default file=/lib64/ld-2.12.so kernelpagesize_kB=4 anon=1 dirty=1 N3=1
-3206220000 default file=/lib64/ld-2.12.so kernelpagesize_kB=4 anon=1 dirty=1 N3=1
-3206221000 default kernelpagesize_kB=4 anon=1 dirty=1 N3=1
-3206800000 default file=/lib64/libc-2.12.so kernelpagesize_kB=4 mapped=59 mapmax=21 active=55 N0=41 N3=18
+00400000 default file=/usr/local/bin/app mapped=1 active=0 N3=1 kernelpagesize_kB=4
+00600000 default file=/usr/local/bin/app anon=1 dirty=1 N3=1 kernelpagesize_kB=4
+3206000000 default file=/lib64/ld-2.12.so mapped=26 mapmax=6 N0=24 N3=2 kernelpagesize_kB=4
+320621f000 default file=/lib64/ld-2.12.so anon=1 dirty=1 N3=1 kernelpagesize_kB=4
+3206220000 default file=/lib64/ld-2.12.so anon=1 dirty=1 N3=1 kernelpagesize_kB=4
+3206221000 default anon=1 dirty=1 N3=1 kernelpagesize_kB=4
+3206800000 default file=/lib64/libc-2.12.so mapped=59 mapmax=21 active=55 N0=41 N3=18 kernelpagesize_kB=4
320698b000 default file=/lib64/libc-2.12.so
-3206b8a000 default file=/lib64/libc-2.12.so kernelpagesize_kB=4 anon=2 dirty=2 N3=2
-3206b8e000 default file=/lib64/libc-2.12.so kernelpagesize_kB=4 anon=1 dirty=1 N3=1
-3206b8f000 default kernelpagesize_kB=4 anon=3 dirty=3 active=1 N3=3
-7f4dc10a2000 default kernelpagesize_kB=4 anon=3 dirty=3 N3=3
-7f4dc10b4000 default kernelpagesize_kB=4 anon=2 dirty=2 active=1 N3=2
-7f4dc1200000 default file=/anon_hugepage\040(deleted) huge kernelpagesize_kB=2048 anon=1 dirty=1 N3=1
-7fff335f0000 default stack kernelpagesize_kB=4 anon=3 dirty=3 N3=3
-7fff3369d000 default kernelpagesize_kB=4 mapped=1 mapmax=35 active=0 N3=1
+3206b8a000 default file=/lib64/libc-2.12.so anon=2 dirty=2 N3=2 kernelpagesize_kB=4
+3206b8e000 default file=/lib64/libc-2.12.so anon=1 dirty=1 N3=1 kernelpagesize_kB=4
+3206b8f000 default anon=3 dirty=3 active=1 N3=3 kernelpagesize_kB=4
+7f4dc10a2000 default anon=3 dirty=3 N3=3 kernelpagesize_kB=4
+7f4dc10b4000 default anon=2 dirty=2 active=1 N3=2 kernelpagesize_kB=4
+7f4dc1200000 default file=/anon_hugepage\040(deleted) huge anon=1 dirty=1 N3=1 kernelpagesize_kB=2048
+7fff335f0000 default stack anon=3 dirty=3 N3=3 kernelpagesize_kB=4
+7fff3369d000 default mapped=1 mapmax=35 active=0 N3=1 kernelpagesize_kB=4
Where:
"address" is the starting address for the mapping;
diff -puN fs/proc/task_mmu.c~fs-proc-task_mmu-show-page-size-in-proc-pid-numa_maps fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c~fs-proc-task_mmu-show-page-size-in-proc-pid-numa_maps
+++ a/fs/proc/task_mmu.c
@@ -1557,6 +1557,8 @@ static int show_numa_map(struct seq_file
for_each_node_state(nid, N_MEMORY)
if (md->node[nid])
seq_printf(m, " N%d=%lu", nid, md->node[nid]);
+
+ seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10);
out:
seq_putc(m, '\n');
m_cache_vma(m, vma);
_
Patches currently in -mm which might be from aquini@xxxxxxxxxx are
origin.patch
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