smaps: account swap entries

Show the amount of swap for each vma.  This can be used to see where all the
swap goes.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Matt Mackall <mpm@selenic.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 12 insertions, 4 deletions

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index f4ab76c7c662..7415eeb7cc3a 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -338,8 +338,7 @@ const struct file_operations proc_maps_operations = {
 #define PSS_SHIFT 12
 
 #ifdef CONFIG_PROC_PAGE_MONITOR
-struct mem_size_stats
-{
+struct mem_size_stats {
         struct vm_area_struct *vma;
         unsigned long resident;
         unsigned long shared_clean;
@@ -347,6 +346,7 @@ struct mem_size_stats
         unsigned long private_clean;
         unsigned long private_dirty;
         unsigned long referenced;
+        unsigned long swap;
         u64 pss;
 };
 
@@ -363,6 +363,12 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
         pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
         for (; addr != end; pte++, addr += PAGE_SIZE) {
                 ptent = *pte;
+
+                if (is_swap_pte(ptent)) {
+                        mss->swap += PAGE_SIZE;
+                        continue;
+                }
+
                 if (!pte_present(ptent))
                         continue;
 
@@ -421,7 +427,8 @@ static int show_smap(struct seq_file *m, void *v)
                    "Shared_Dirty:   %8lu kB\n"
                    "Private_Clean:  %8lu kB\n"
                    "Private_Dirty:  %8lu kB\n"
-                   "Referenced:     %8lu kB\n",
+                   "Referenced:     %8lu kB\n"
+                   "Swap:           %8lu kB\n",
                    (vma->vm_end - vma->vm_start) >> 10,
                    mss.resident >> 10,
                    (unsigned long)(mss.pss >> (10 + PSS_SHIFT)),
@@ -429,7 +436,8 @@ static int show_smap(struct seq_file *m, void *v)
                    mss.shared_dirty  >> 10,
                    mss.private_clean >> 10,
                    mss.private_dirty >> 10,
-                   mss.referenced >> 10);
+                   mss.referenced >> 10,
+                   mss.swap >> 10);
 
         return ret;
 }