[Xen-changelog] fix ballooning out logic to handle dying domain freeing memory.

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User vh249@xxxxxxxxxxxxxxxxxxxxxx
# Node ID bc5e0fc79696086a29cd1eddd9363afa59c0b6fb
# Parent  b3b4391a14e5f902a954a4aa0520fba1193163cf
fix ballooning out logic to handle dying domain freeing memory.

Signed-off-by: Vincent Hanquez <vincent@xxxxxxxxxxxxx>

diff -r b3b4391a14e5 -r bc5e0fc79696 tools/python/xen/xm/create.py
--- a/tools/python/xen/xm/create.py     Sat Sep 10 14:42:39 2005
+++ b/tools/python/xen/xm/create.py     Sat Sep 10 14:43:46 2005
@@ -772,30 +772,33 @@
     """Balloon out memory from dom0 if necessary"""
     SLACK = 4
     timeout = 20 # 2s
-    ret = 0
+    ret = 1
 
     xc = xen.lowlevel.xc.new()
-    pinfo = xc.physinfo()
-    free_mem = pinfo['free_pages'] / 256
+    free_mem = xc.physinfo()['free_pages'] / 256
     domU_need_mem = opts.vals.memory + SLACK 
+
+    # we already have enough free memory, return success
+    if free_mem >= domU_need_mem:
+        del xc
+        return 0
 
     dom0_cur_alloc = get_dom0_alloc()
     dom0_new_alloc = dom0_cur_alloc - (domU_need_mem - free_mem)
-
-    if free_mem < domU_need_mem and dom0_new_alloc < dom0_min_mem:
-        ret = 1
-    if free_mem < domU_need_mem and ret == 0:
-
-        server.xend_domain_mem_target_set(0, dom0_new_alloc)
-
-        while dom0_cur_alloc > dom0_new_alloc and timeout > 0:
-            time.sleep(0.1) # sleep 100ms
-            dom0_cur_alloc = get_dom0_alloc()
-            timeout -= 1
-        
-        if dom0_cur_alloc > dom0_new_alloc:
-            ret = 1
-    
+    if dom0_new_alloc < dom0_min_mem:
+        dom0_new_alloc = dom0_min_mem
+
+    server.xend_domain_mem_target_set(0, dom0_new_alloc)
+
+    while timeout > 0:
+        time.sleep(0.1) # sleep 100ms
+
+        free_mem = xc.physinfo()['free_pages'] / 256
+        if free_mem >= domU_need_mem:
+            ret = 0
+            break
+        timeout -= 1
+
     del xc
     return ret
 

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