Per Paul Hargrove's suggestion, create an opal_pagesize function to abstract the various ways of obtaining that value. Rather than creating a separate file for only that one function, put it in a convenient place that is at least somewhat related.

Refs trac:4826

This commit was SVN r32407.

The following Trac tickets were found above:
  Ticket 4826 --> https://svn.open-mpi.org/trac/ompi/ticket/4826

ompi/mca/osc/sm/osc_sm_component.c

@@ -3,6 +3,7 @@
  * Copyright (c) 2012      Sandia National Laboratories.  All rights reserved.
  * Copyright (c) 2014      Los Alamos National Security, LLC. All rights
  *                         reserved.
+ * Copyright (c) 2014      Intel, Inc. All rights reserved.
  * $COPYRIGHT$
  * 
  * Additional copyrights may follow
@@ -17,6 +18,7 @@
 #include "ompi/mca/osc/base/osc_base_obj_convert.h"
 #include "ompi/request/request.h"
 #include "opal/class/ompi_free_list.h"
+#include "opal/util/sys_limits.h"
 
 #include "osc_sm.h"
 
@@ -213,11 +215,8 @@ component_select(struct ompi_win_t *win, void **base, size_t size, int disp_unit
         OPAL_OUTPUT_VERBOSE((1, ompi_osc_base_framework.framework_output,
                              "allocating shared memory region of size %ld\n", (long) size));
 
-#ifdef HAVE_GETPAGESIZE
-        pagesize = getpagesize();
-#else
-        pagesize = 4096;
-#endif
+        /* get the pagesize */
+        pagesize = opal_getpagesize();
 
         rbuf = malloc(sizeof(unsigned long) * ompi_comm_size(module->comm));
         if (NULL == rbuf) return OMPI_ERR_TEMP_OUT_OF_RESOURCE;

opal/util/sys_limits.c

@@ -12,14 +12,12 @@
  * Copyright (c) 2007      Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2013      Los Alamos National Security, LLC.
  *                         All rights reserved.
+ * Copyright (c) 2014      Intel, Inc. All rights reserved.
  * $COPYRIGHT$
  * 
  * Additional copyrights may follow
  * 
  * $HEADER$
- *
- * This file is only here because some platforms have a broken strncpy
- * (e.g., Itanium with RedHat Advanced Server glibc).
  */
 
 #include "opal_config.h"
@@ -38,6 +36,9 @@
 #ifdef HAVE_SYS_RESOURCE_H
 #include <sys/resource.h>
 #endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 
 #include "opal/constants.h"
 #include "opal/runtime/opal_params.h"
@@ -224,3 +225,16 @@ int opal_util_init_sys_limits(char **errmsg)
 
     return OPAL_SUCCESS;
 }
+
+int opal_getpagesize(void)
+{
+#ifdef HAVE_GETPAGESIZE
+    return getpagesize();
+#elif defined(_SC_PAGESIZE )
+    return sysconf(_SC_PAGESIZE);
+#elif defined(_SC_PAGE_SIZE)
+    return sysconf(_SC_PAGE_SIZE);
+#else
+    return 65536; /* safer to overestimate than under */
+#endif
+}

opal/util/sys_limits.h

@@ -11,6 +11,7 @@
  *                         All rights reserved.
  * Copyright (c) 2013      Los Alamos National Security, LLC.
  *                         All rights reserved.
+ * Copyright (c) 2014      Intel, Inc. All rights reserved.
  * $COPYRIGHT$
  * 
  * Additional copyrights may follow
@@ -49,6 +50,12 @@ OPAL_DECLSPEC extern opal_sys_limits_t opal_sys_limits;
  */
 OPAL_DECLSPEC int opal_util_init_sys_limits(char **errmsg);
 
+/**
+ * Get pagesize
+ */
+OPAL_DECLSPEC int opal_getpagesize(void);
+
+
 END_C_DECLS
 
 #endif /* OPAL_STRNCPY_H */