Pavel Emelyanov wrote:
When a page is swapped out it should be included in the memory dump,
but the existing mincore() doesn't report the set bit for such pages.
Thus add a bit for swapped out pages.
We can reuse ANON bit there.
Plus you forget to handle migration-entries, they can be both file and anon too.
Signed-off-by: Pavel Emelyanov<xemul@xxxxxxxxxxxxx>
---
include/linux/mman.h | 1 +
mm/mincore.c | 2 +-
2 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/include/linux/mman.h b/include/linux/mman.h
index 9d1de16..bfe4038 100644
--- a/include/linux/mman.h
+++ b/include/linux/mman.h
@@ -12,6 +12,7 @@
#define MINCORE_RESIDENT 0x1
#define MINCORE_ANON 0x2
+#define MINCORE_SWAP 0x4
#ifdef __KERNEL__
#include<linux/mm.h>
diff --git a/mm/mincore.c b/mm/mincore.c
index 3163dfb..82c5c3e 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -146,7 +146,7 @@ static void mincore_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
} else {
#ifdef CONFIG_SWAP
pgoff = entry.val;
- *vec = mincore_page(&swapper_space, pgoff);
+ *vec = mincore_page(&swapper_space, pgoff) | MINCORE_SWAP;
#else
WARN_ON(1);
*vec = MINCORE_RESIDENT;
--
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