mm: report the pagesize backing a VMA in /proc/pid/smaps

It is useful to verify a hugepage-aware application is using the expected
pagesizes for its memory regions. This patch creates an entry called
KernelPageSize in /proc/pid/smaps that is the size of page used by the
kernel to back a VMA. The entry is not called PageSize as it is possible
the MMU uses a different size. This extension should not break any sensible
parser that skips lines containing unrecognised information.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: "KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 3a8bdd7f5756..41ef5f23e779 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -396,7 +396,8 @@ static int show_smap(struct seq_file *m, void *v)
                    "Private_Clean:  %8lu kB\n"
                    "Private_Dirty:  %8lu kB\n"
                    "Referenced:     %8lu kB\n"
-                   "Swap:           %8lu kB\n",
+                   "Swap:           %8lu kB\n"
+                   "KernelPageSize: %8lu kB\n",
                    (vma->vm_end - vma->vm_start) >> 10,
                    mss.resident >> 10,
                    (unsigned long)(mss.pss >> (10 + PSS_SHIFT)),
@@ -405,7 +406,8 @@ static int show_smap(struct seq_file *m, void *v)
                    mss.private_clean >> 10,
                    mss.private_dirty >> 10,
                    mss.referenced >> 10,
-                   mss.swap >> 10);
+                   mss.swap >> 10,
+                   vma_kernel_pagesize(vma) >> 10);
 
         if (m->count < m->size)  /* vma is copied successfully */
                 m->version = (vma != get_gate_vma(task)) ? vma->vm_start : 0;