xen/xenpaging.record-numer-paged-out-pages.patch

# HG changeset patch
# Parent 8e31f3194c87e1cdb41621caa5a41810ef787293
xenpaging: track the number of paged-out pages

This change is required by subsequent changes.

Signed-off-by: Olaf Hering <olaf@aepfle.de>

---
 tools/xenpaging/xenpaging.c |    8 ++++++++
 tools/xenpaging/xenpaging.h |    1 +
 2 files changed, 9 insertions(+)

Index: xen-4.1.2-testing/tools/xenpaging/xenpaging.c
===================================================================
--- xen-4.1.2-testing.orig/tools/xenpaging/xenpaging.c
+++ xen-4.1.2-testing/tools/xenpaging/xenpaging.c
@@ -467,6 +467,9 @@ static int xenpaging_evict_page(xenpagin
     /* Notify policy of page being paged out */
     policy_notify_paged_out(victim->gfn);
 
+    /* Record number of evicted pages */
+    paging->num_paged_out++;
+
  out:
     return ret;
 }
@@ -480,8 +483,13 @@ static int xenpaging_resume_page(xenpagi
 
     /* Notify policy of page being paged in */
     if ( notify_policy )
+    {
         policy_notify_paged_in(rsp->gfn);
 
+       /* Record number of resumed pages */
+       paging->num_paged_out--;
+    }
+
     /* Tell Xen page is ready */
     ret = xc_mem_paging_resume(paging->xc_handle, paging->mem_event.domain_id,
                                rsp->gfn);
Index: xen-4.1.2-testing/tools/xenpaging/xenpaging.h
===================================================================
--- xen-4.1.2-testing.orig/tools/xenpaging/xenpaging.h
+++ xen-4.1.2-testing/tools/xenpaging/xenpaging.h
@@ -49,6 +49,7 @@ typedef struct xenpaging {
     mem_event_t mem_event;
     /* number of pages for which data structures were allocated */
     int max_pages;
+    int num_paged_out;
     int num_pages;
     int policy_mru_size;
     unsigned long pagein_queue[XENPAGING_PAGEIN_QUEUE_SIZE];