tools/vm/page-types.c: support swap entry

/proc/pid/pagemap (pte_to_pagemap_entry() internally) already reports
about swap entry, so let's make the in-kernel utility aware of it.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Vladimir Davydov <vdavydov@parallels.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 29 insertions, 1 deletions

diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c
index 5a6016224bb9..ec62ab4d8b55 100644
--- a/tools/vm/page-types.c
+++ b/tools/vm/page-types.c
@@ -61,6 +61,8 @@
 #define PM_PFRAME_BITS          55
 #define PM_PFRAME_MASK          ((1LL << PM_PFRAME_BITS) - 1)
 #define PM_PFRAME(x)            ((x) & PM_PFRAME_MASK)
+#define MAX_SWAPFILES_SHIFT     5
+#define PM_SWAP_OFFSET(x)       (((x) & PM_PFRAME_MASK) >> MAX_SWAPFILES_SHIFT)
 #define PM_SOFT_DIRTY           (1ULL << 55)
 #define PM_MMAP_EXCLUSIVE       (1ULL << 56)
 #define PM_FILE                 (1ULL << 61)
@@ -92,7 +94,8 @@
 #define KPF_SLOB_FREE           49
 #define KPF_SLUB_FROZEN         50
 #define KPF_SLUB_DEBUG          51
-#define KPF_FILE                62
+#define KPF_FILE                61
+#define KPF_SWAP                62
 #define KPF_MMAP_EXCLUSIVE      63
 
 #define KPF_ALL_BITS            ((uint64_t)~0ULL)
@@ -146,6 +149,7 @@ static const char * const page_flag_names[] = {
         [KPF_SLUB_DEBUG]        = "E:slub_debug",
 
         [KPF_FILE]              = "F:file",
+        [KPF_SWAP]              = "w:swap",
         [KPF_MMAP_EXCLUSIVE]    = "1:mmap_exclusive",
 };
 
@@ -297,6 +301,10 @@ static unsigned long pagemap_pfn(uint64_t val)
         return pfn;
 }
 
+static unsigned long pagemap_swap_offset(uint64_t val)
+{
+        return val & PM_SWAP ? PM_SWAP_OFFSET(val) : 0;
+}
 
 /*
  * page flag names
@@ -452,6 +460,8 @@ static uint64_t expand_overloaded_flags(uint64_t flags, uint64_t pme)
                 flags |= BIT(SOFTDIRTY);
         if (pme & PM_FILE)
                 flags |= BIT(FILE);
+        if (pme & PM_SWAP)
+                flags |= BIT(SWAP);
         if (pme & PM_MMAP_EXCLUSIVE)
                 flags |= BIT(MMAP_EXCLUSIVE);
 
@@ -613,6 +623,22 @@ static void walk_pfn(unsigned long voffset,
         }
 }
 
+static void walk_swap(unsigned long voffset, uint64_t pme)
+{
+        uint64_t flags = kpageflags_flags(0, pme);
+
+        if (!bit_mask_ok(flags))
+                return;
+
+        if (opt_list == 1)
+                show_page_range(voffset, pagemap_swap_offset(pme), 1, flags);
+        else if (opt_list == 2)
+                show_page(voffset, pagemap_swap_offset(pme), flags);
+
+        nr_pages[hash_slot(flags)]++;
+        total_pages++;
+}
+
 #define PAGEMAP_BATCH   (64 << 10)
 static void walk_vma(unsigned long index, unsigned long count)
 {
@@ -632,6 +658,8 @@ static void walk_vma(unsigned long index, unsigned long count)
                         pfn = pagemap_pfn(buf[i]);
                         if (pfn)
                                 walk_pfn(index + i, pfn, 1, buf[i]);
+                        if (buf[i] & PM_SWAP)
+                                walk_swap(index + i, buf[i]);
                 }
 
                 index += pages;