[Xen-devel] [PATCH 6 of 8] x86/mm: Properly account for paged out pages

[Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>]

 xen/arch/x86/mm/p2m.c |  3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)


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>

diff -r c41436e555cd -r d4336e35f0bc xen/arch/x86/mm/p2m.c
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -1041,7 +1041,8 @@ int p2m_mem_paging_prep(struct domain *d
                     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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