[Xen-changelog] [xen-unstable] libxc: save: don't bother calculating stat's deltas unless we are going to print them

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1306228450 -3600
# Node ID 89a7f356a864237249b88cefafea0265abf6afb2
# Parent  a0489d7985f9b202411351a5a213edbe18a333fc
libxc: save: don't bother calculating stat's deltas unless we are going to 
print them

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Ian Jackson <ian.jackson.citrix.com>
Committed-by: Ian Jackson <ian.jackson.citrix.com>
---


diff -r a0489d7985f9 -r 89a7f356a864 tools/libxc/xc_domain_save.c
--- a/tools/libxc/xc_domain_save.c      Tue May 24 10:14:10 2011 +0100
+++ b/tools/libxc/xc_domain_save.c      Tue May 24 10:14:10 2011 +0100
@@ -275,10 +275,6 @@
     static struct time_stats last;
     struct time_stats now;
 
-    long long wall_delta;
-    long long d0_cpu_delta;
-    long long d1_cpu_delta;
-
     gettimeofday(&now.wall, NULL);
 
     now.d0_cpu = xc_domain_get_cpu_usage(xch, 0, /* FIXME */ 0)/1000;
@@ -287,14 +283,19 @@
     if ( (now.d0_cpu == -1) || (now.d1_cpu == -1) )
         DPRINTF("ARRHHH!!\n");
 
-    wall_delta = tv_delta(&now.wall,&last.wall)/1000;
-    if ( wall_delta == 0 )
-        wall_delta = 1;
+    if ( print )
+    {
+        long long wall_delta;
+        long long d0_cpu_delta;
+        long long d1_cpu_delta;
 
-    d0_cpu_delta = (now.d0_cpu - last.d0_cpu)/1000;
-    d1_cpu_delta = (now.d1_cpu - last.d1_cpu)/1000;
+        wall_delta = tv_delta(&now.wall,&last.wall)/1000;
+        if ( wall_delta == 0 )
+            wall_delta = 1;
 
-    if ( print )
+        d0_cpu_delta = (now.d0_cpu - last.d0_cpu)/1000;
+        d1_cpu_delta = (now.d1_cpu - last.d1_cpu)/1000;
+
         DPRINTF("delta %lldms, dom0 %d%%, target %d%%, sent %dMb/s, "
                 "dirtied %dMb/s %" PRId32 " pages\n",
                 wall_delta,
@@ -303,6 +304,7 @@
                 (int)((pages_sent*PAGE_SIZE)/(wall_delta*(1000/8))),
                 (int)((stats->dirty_count*PAGE_SIZE)/(wall_delta*(1000/8))),
                 stats->dirty_count);
+    }
 
     last = now;
 

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