[Xen-changelog] [xen-unstable] x86/mm: Properly account for paged out pages

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>
# Date 1327584087 0
# Node ID 7a28b8b2d3ea01bb7c1a9e50b0af3c1709e36f2d
# Parent  cdceeb86ae08a03553a68bf4729ae9db38cbe821
x86/mm: Properly account for paged out pages

If we hit the page after nominate but before paging it out, don't decrement the
domain count of paged out pages.

Signed-off-by: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>
Acked-by: Tim Deegan <tim@xxxxxxx>
Committed-by: Tim Deegan <tim@xxxxxxx>
---


diff -r cdceeb86ae08 -r 7a28b8b2d3ea xen/arch/x86/mm/p2m.c
--- a/xen/arch/x86/mm/p2m.c     Thu Jan 26 13:21:27 2012 +0000
+++ b/xen/arch/x86/mm/p2m.c     Thu Jan 26 13:21:27 2012 +0000
@@ -1041,7 +1041,8 @@
                     p2m_ram_rw, a);
     set_gpfn_from_mfn(mfn_x(mfn), gfn);
 
-    atomic_dec(&d->paged_pages);
+    if ( !page_extant )
+        atomic_dec(&d->paged_pages);
 
     ret = 0;
 

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