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diff --git a/sys/sys/user.h b/sys/sys/user.h
--- a/sys/sys/user.h
+++ b/sys/sys/user.h
@@ -552,11 +552,18 @@
uint64_t kvo_resident; /* Number of resident pages. */
uint64_t kvo_active; /* Number of active pages. */
uint64_t kvo_inactive; /* Number of inactive pages. */
- uint64_t kvo_vn_fsid;
- uint64_t _kvo_qspare[7];
- uint32_t _kvo_ispare[8];
+ union {
+ uint64_t _kvo_vn_fsid;
+ uint64_t _kvo_backing_obj; /* Handle for the backing obj */
+ } kvo_type_spec; /* Type-specific union */
+ uint64_t kvo_me; /* Uniq handle for anon obj */
+ uint64_t _kvo_qspare[6];
+ uint32_t kvo_swapped; /* Number of swapped pages */
+ uint32_t _kvo_ispare[7];
char kvo_path[PATH_MAX]; /* Pathname, if any. */
};
+#define kvo_vn_fsid kvo_type_spec._kvo_vn_fsid
+#define kvo_backing_obj kvo_type_spec._kvo_backing_obj
/*
* The KERN_PROC_KSTACK sysctl allows a process to dump the kernel stacks of
diff --git a/sys/vm/swap_pager.h b/sys/vm/swap_pager.h
--- a/sys/vm/swap_pager.h
+++ b/sys/vm/swap_pager.h
@@ -81,6 +81,7 @@
int swap_pager_nswapdev(void);
int swap_pager_reserve(vm_object_t, vm_pindex_t, vm_size_t);
void swap_pager_status(int *total, int *used);
+u_long swap_pager_swapped_pages(vm_object_t object);
void swapoff_all(void);
#endif /* _KERNEL */
diff --git a/sys/vm/swap_pager.c b/sys/vm/swap_pager.c
--- a/sys/vm/swap_pager.c
+++ b/sys/vm/swap_pager.c
@@ -1763,6 +1763,28 @@
vm_page_launder(m);
}
+u_long
+swap_pager_swapped_pages(vm_object_t object)
+{
+ struct swblk *sb;
+ vm_pindex_t pi;
+ u_long res;
+ int i;
+
+ VM_OBJECT_ASSERT_LOCKED(object);
+ if (object->type != OBJT_SWAP)
+ return (0);
+
+ for (res = 0, pi = 0; (sb = SWAP_PCTRIE_LOOKUP_GE(
+ &object->un_pager.swp.swp_blks, pi)) != NULL; ) {
+ for (i = 0; i < SWAP_META_PAGES; i++) {
+ if (sb->d[i] != 0)
+ res++;
+ }
+ }
+ return (res);
+}
+
/*
* swap_pager_swapoff_object:
*
diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c
--- a/sys/vm/vm_object.c
+++ b/sys/vm/vm_object.c
@@ -73,6 +73,7 @@
#include <sys/systm.h>
#include <sys/blockcount.h>
#include <sys/cpuset.h>
+#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/mman.h>
#include <sys/mount.h>
@@ -2524,6 +2525,7 @@
struct vattr va;
vm_object_t obj;
vm_page_t m;
+ u_long sp;
int count, error;
if (req->oldptr == NULL) {
@@ -2590,8 +2592,17 @@
freepath = NULL;
fullpath = "";
kvo->kvo_type = vm_object_kvme_type(obj, &vp);
- if (vp != NULL)
+ if (vp != NULL) {
vref(vp);
+ } else if ((obj->flags & OBJ_ANON) != 0) {
+ MPASS(obj->type == OBJT_DEFAULT ||
+ obj->type == OBJT_SWAP);
+ kvo->kvo_me = (uintptr_t)obj;
+ /* tmpfs objs are reported as vnodes */
+ kvo->kvo_backing_obj = (uintptr_t)obj->backing_object;
+ sp = swap_pager_swapped_pages(obj);
+ kvo->kvo_swapped = sp > UINT32_MAX ? UINT32_MAX : sp;
+ }
VM_OBJECT_RUNLOCK(obj);
if (vp != NULL) {
vn_fullpath(vp, &fullpath, &freepath);

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