fix #1432: use the actual system PAGESIZE when calculating USS memory

2 files changed, 3 insertions, 1 deletions

diff --git a/HISTORY.rst b/HISTORY.rst
index 7de87584..aa2b2fed 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -22,6 +22,8 @@ XXXX-XX-XX
 - 1431_: [Windows] GetNativeSystemInfo is not used instead of GetSystemInfo in
   order to support WoW64 processes. Affected APIs are psutil.cpu_count(),
   and Process memory_maps() and memory_info_exe() ("uss" field).
+- 1432_: [Windows] Process.memory_info_ex()'s USS memory is miscalculated
+  because we're not using the actual system PAGESIZE.
 
 5.5.1
 =====
diff --git a/psutil/_psutil_windows.c b/psutil/_psutil_windows.c
index df52d436..8ab21aa7 100644
--- a/psutil/_psutil_windows.c
+++ b/psutil/_psutil_windows.c
@@ -808,7 +808,7 @@ psutil_proc_memory_uss(PyObject *self, PyObject *args)
     if (! PyArg_ParseTuple(args, "l", &pid))
         return NULL;
 
-
+    GetNativeSystemInfo(&system_info);
     proc = psutil_handle_from_pid(pid, access);
     if (proc == NULL)
         return NULL;