[Xen-changelog] [xen-unstable] xend memory ballooning: do not bother if guest will not fit in

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

# HG changeset patch
# User Keir Fraser <keir@xxxxxxxxxxxxx>
# Date 1190709000 -3600
# Node ID 55c45361bbe32d3046e1245415dded998ce057e4
# Parent  ad339d88639d56f08546ba0dab55b2c717b4d60b
xend memory ballooning: do not bother if guest will not fit in
physical memory constraints.

If users require domain memory size larger than a physical memory
size, we do not need waiting for ballooning, and should cause
xm create command error right away.

Signed-off-by: Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>
---
 tools/python/xen/xend/balloon.py |   16 ++++++++++++++++
 1 files changed, 16 insertions(+)

diff -r ad339d88639d -r 55c45361bbe3 tools/python/xen/xend/balloon.py
--- a/tools/python/xen/xend/balloon.py  Mon Sep 24 21:52:10 2007 +0100
+++ b/tools/python/xen/xend/balloon.py  Tue Sep 25 09:30:00 2007 +0100
@@ -100,12 +100,28 @@ def free(need_mem):
 
     try:
         dom0_min_mem = xoptions.get_dom0_min_mem() * 1024
+        dom0_alloc = get_dom0_current_alloc()
 
         retries = 0
         sleep_time = SLEEP_TIME_GROWTH
+        new_alloc = 0
         last_new_alloc = None
         last_free = None
         rlimit = RETRY_LIMIT
+
+        # If unreasonable memory size is required, we give up waiting
+        # for ballooning or scrubbing, as if had retried.
+        physinfo = xc.physinfo()
+        free_mem = physinfo['free_memory']
+        scrub_mem = physinfo['scrub_memory']
+        total_mem = physinfo['total_memory']
+        if dom0_min_mem > 0:
+            max_free_mem = total_mem - dom0_min_mem
+        else:
+            max_free_mem = total_mem - dom0_alloc
+        if need_mem >= max_free_mem:
+            retries = rlimit
+
         while retries < rlimit:
             physinfo = xc.physinfo()
             free_mem = physinfo['free_memory']

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