[Xen-devel] [PATCH 15 of 20] xenpaging: use guests tot_pages as working target

[Olaf Hering <olaf@xxxxxxxxx>]

# HG changeset patch
# User Olaf Hering <olaf@xxxxxxxxx>
# Date 1321804965 -3600
# Node ID 827fcaf0d610dd0c54d3f1f305b2b8f12bd4240a
# Parent  303d1521463bda6431cc0001d8755dd681e67a0d
xenpaging: use guests tot_pages as working target

This change reverses the task of xenpaging. Before this change a fixed number
of pages was paged out. With this change the guest will not have access to
more than the given number of pages at the same time.

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>

diff -r 303d1521463b -r 827fcaf0d610 tools/xenpaging/policy_default.c
--- a/tools/xenpaging/policy_default.c
+++ b/tools/xenpaging/policy_default.c
@@ -71,7 +71,6 @@ int policy_init(xenpaging_t *paging)
 
     /* Start in the middle to avoid paging during BIOS startup */
     current_gfn = max_pages / 2;
-    current_gfn -= paging->num_pages / 2;
 
     rc = 0;
  out:
diff -r 303d1521463b -r 827fcaf0d610 tools/xenpaging/xenpaging.c
--- a/tools/xenpaging/xenpaging.c
+++ b/tools/xenpaging/xenpaging.c
@@ -136,6 +136,21 @@ err:
     return rc;
 }
 
+static int xenpaging_get_tot_pages(xenpaging_t *paging)
+{
+    xc_interface *xch = paging->xc_handle;
+    xc_domaininfo_t domain_info;
+    int rc;
+
+    rc = xc_domain_getinfolist(xch, paging->mem_event.domain_id, 1, 
&domain_info);
+    if ( rc != 1 )
+    {
+        PERROR("Error getting domain info");
+        return -1;
+    }
+    return domain_info.tot_pages;
+}
+
 static void *init_page(void)
 {
     void *buffer;
@@ -161,7 +176,7 @@ static void *init_page(void)
     return NULL;
 }
 
-static xenpaging_t *xenpaging_init(domid_t domain_id, int num_pages)
+static xenpaging_t *xenpaging_init(domid_t domain_id, int target_tot_pages)
 {
     xenpaging_t *paging;
     xc_domaininfo_t domain_info;
@@ -296,12 +311,7 @@ static xenpaging_t *xenpaging_init(domid
     }
     DPRINTF("max_pages = %d\n", paging->max_pages);
 
-    if ( num_pages < 0 || num_pages > paging->max_pages )
-    {
-        num_pages = paging->max_pages;
-        DPRINTF("setting num_pages to %d\n", num_pages);
-    }
-    paging->num_pages = num_pages;
+    paging->target_tot_pages = target_tot_pages;
 
     /* Initialise policy */
     rc = policy_init(paging);
@@ -648,7 +658,9 @@ int main(int argc, char *argv[])
     xenpaging_victim_t *victims;
     mem_event_request_t req;
     mem_event_response_t rsp;
+    int num, prev_num = 0;
     int i;
+    int tot_pages;
     int rc = -1;
     int rc1;
     xc_interface *xch;
@@ -659,7 +671,7 @@ int main(int argc, char *argv[])
 
     if ( argc != 3 )
     {
-        fprintf(stderr, "Usage: %s <domain_id> <num_pages>\n", argv[0]);
+        fprintf(stderr, "Usage: %s <domain_id> <tot_pages>\n", argv[0]);
         return -1;
     }
 
@@ -672,7 +684,7 @@ int main(int argc, char *argv[])
     }
     xch = paging->xc_handle;
 
-    DPRINTF("starting %s %u %d\n", argv[0], paging->mem_event.domain_id, 
paging->num_pages);
+    DPRINTF("starting %s %u %d\n", argv[0], paging->mem_event.domain_id, 
paging->target_tot_pages);
 
     /* Open file */
     sprintf(filename, "page_cache_%u", paging->mem_event.domain_id);
@@ -704,9 +716,6 @@ int main(int argc, char *argv[])
     /* listen for page-in events to stop pager */
     create_page_in_thread(paging);
 
-    i = evict_pages(paging, fd, victims, paging->num_pages);
-    DPRINTF("%d pages evicted. Done.\n", i);
-
     /* Swap pages in and out */
     while ( 1 )
     {
@@ -771,12 +780,8 @@ int main(int argc, char *argv[])
                     goto out;
                 }
 
-                /* Evict a new page to replace the one we just paged in,
-                 * or clear this pagefile slot on exit */
-                if ( interrupted )
-                    victims[i].gfn = INVALID_MFN;
-                else
-                    evict_victim(paging, &victims[i], fd, i);
+                /* Clear this pagefile slot */
+                victims[i].gfn = INVALID_MFN;
             }
             else
             {
@@ -823,6 +828,43 @@ int main(int argc, char *argv[])
         if ( interrupted )
             break;
 
+        /* Check if the target has been reached already */
+        tot_pages = xenpaging_get_tot_pages(paging);
+        if ( tot_pages < 0 )
+            goto out;
+
+        /* Resume all pages if paging is disabled or no target was set */
+        if ( paging->target_tot_pages == 0 )
+        {
+            if ( paging->num_paged_out )
+                resume_pages(paging, paging->num_paged_out);
+        }
+        /* Evict more pages if target not reached */
+        else if ( tot_pages > paging->target_tot_pages )
+        {
+            num = tot_pages - paging->target_tot_pages;
+            if ( num != prev_num )
+            {
+                DPRINTF("Need to evict %d pages to reach %d 
target_tot_pages\n", num, paging->target_tot_pages);
+                prev_num = num;
+            }
+            /* Limit the number of evicts to be able to process page-in 
requests */
+            if ( num > 42 )
+                num = 42;
+            evict_pages(paging, fd, victims, num);
+        }
+        /* Resume some pages if target not reached */
+        else if ( tot_pages < paging->target_tot_pages && 
paging->num_paged_out )
+        {
+            num = paging->target_tot_pages - tot_pages;
+            if ( num != prev_num )
+            {
+                DPRINTF("Need to resume %d pages to reach %d 
target_tot_pages\n", num, paging->target_tot_pages);
+                prev_num = num;
+            }
+            resume_pages(paging, num);
+        }
+
     }
     DPRINTF("xenpaging got signal %d\n", interrupted);
 
diff -r 303d1521463b -r 827fcaf0d610 tools/xenpaging/xenpaging.h
--- a/tools/xenpaging/xenpaging.h
+++ b/tools/xenpaging/xenpaging.h
@@ -50,7 +50,7 @@ typedef struct xenpaging {
     /* number of pages for which data structures were allocated */
     int max_pages;
     int num_paged_out;
-    int num_pages;
+    int target_tot_pages;
     int policy_mru_size;
     unsigned long pagein_queue[XENPAGING_PAGEIN_QUEUE_SIZE];
 } xenpaging_t;

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