[Xen-devel] [PATCH 10 of 13] Tools: Expose to libxc the total number of shared frames and space saved

[Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>]

 tools/libxc/xc_memshr.c |  10 ++++++++++
 tools/libxc/xenctrl.h   |  17 +++++++++++++++++
 2 files changed, 27 insertions(+), 0 deletions(-)


Signed-off-by: Adin Scannell <adin@xxxxxxxxxxx>
Signed-off-by: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>

diff -r f859c29d4011 -r 9116fc441ca4 tools/libxc/xc_memshr.c
--- a/tools/libxc/xc_memshr.c
+++ b/tools/libxc/xc_memshr.c
@@ -225,3 +225,13 @@ int xc_memshr_debug_gref(xc_interface *x
     return do_domctl(xch, &domctl);
 }
 
+long xc_sharing_freed_pages(xc_interface *xch)
+{
+    return do_memory_op(xch, XENMEM_get_sharing_freed_pages, NULL, 0);
+}
+
+long xc_sharing_used_frames(xc_interface *xch)
+{
+    return do_memory_op(xch, XENMEM_get_sharing_shared_pages, NULL, 0);
+}
+
diff -r f859c29d4011 -r 9116fc441ca4 tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -1233,6 +1233,23 @@ int xc_mmuext_op(xc_interface *xch, stru
 /* System wide memory properties */
 long xc_maximum_ram_page(xc_interface *xch);
 
+/**
+ * This function returns the total number of pages freed by using sharing
+ * on the system.  For example, if two domains contain a single entry in
+ * their p2m map that points to the same shared page (and no other pages
+ * in the system are shared), then this function should return 1.
+ */
+long xc_sharing_freed_pages(xc_interface *xch);
+
+/**
+ * This function returns the total number of frames occupied by shared
+ * pages on the system.  This is independent of the number of domains
+ * pointing at these frames.  For example, in the above scenario this
+ * should return 1. The following should hold:
+ *  memory usage without sharing = freed_pages + used_frames
+ */
+long xc_sharing_used_frames(xc_interface *xch);
+
 /* Get current total pages allocated to a domain. */
 long xc_get_tot_pages(xc_interface *xch, uint32_t domid);
 

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