posix: add numa support to RMA shared memory window code

Similarly to pt2pt fastbox integration this patch decomposes current
single shared segment into multiple segments, one per NUMA node, that
can then be separately bound using hwloc. Moreover, when using symheap
either all single segment allocations succeed or none of them does. If a
symheap segment allocation fails all the previous should be reverted. In
order to accomplish this the new function:
`MPIDI_CH4R_release_shm_symheap` has been introduced.

src/mpid/ch4/include/mpidpre.h

@@ -366,10 +366,11 @@ typedef struct MPIDI_CH4U_win_target {
 
 typedef struct MPIDI_CH4U_win_t {
     uint64_t win_id;
-    void *mmap_addr;
-    int64_t mmap_sz;
+    void **mmap_addr;
+    int64_t *mmap_sz;
+    int num_seg;
 
-    MPL_shm_hnd_t shm_segment_handle;
+    MPL_shm_hnd_t *shm_segment_handle;
 
     /* per-window OP completion for fence */
     MPIR_cc_t local_cmpl_cnts;  /* increase at OP issuing, decrease at local completion */

src/mpid/ch4/src/ch4r_symheap.h

@@ -388,7 +388,8 @@ static inline int MPIDI_CH4I_allreduce_maxloc(size_t mysz, int myloc, MPIR_Comm
 #undef FCNAME
 #define FCNAME MPL_QUOTE(FUNCNAME)
 static inline int MPIDI_CH4R_get_shm_symheap(MPI_Aint shm_size, MPI_Aint * shm_offsets,
-                                             MPIR_Comm * comm, MPIR_Win * win, int *fail_flag)
+                                             MPIR_Comm * comm, MPIR_Win * win, int seg_num,
+                                             int *fail_flag)
 {
     int mpi_errno = MPI_SUCCESS;
     unsigned any_mapfail_flag = 1;
@@ -398,8 +399,8 @@ static inline int MPIDI_CH4R_get_shm_symheap(MPI_Aint shm_size, MPI_Aint * shm_o
 
 #ifdef USE_SYM_HEAP
     int iter = MPIR_CVAR_CH4_SHM_SYMHEAP_RETRY;
-    MPL_shm_hnd_t *shm_segment_hdl_ptr = &MPIDI_CH4U_WIN(win, shm_segment_handle);
-    void **base_ptr = &MPIDI_CH4U_WIN(win, mmap_addr);
+    MPL_shm_hnd_t *shm_segment_hdl_ptr = &MPIDI_CH4U_WIN(win, shm_segment_handle[seg_num]);
+    void **base_ptr = &MPIDI_CH4U_WIN(win, mmap_addr[seg_num]);
 
     size_t mapsize = 0, page_sz = 0, maxsz = 0;
     int maxsz_loc = 0;
@@ -505,4 +506,28 @@ static inline int MPIDI_CH4R_get_shm_symheap(MPI_Aint shm_size, MPI_Aint * shm_o
     return mpi_errno;
 }
 
+#undef FUNCNAME
+#define FUNCNAME MPIDI_CH4R_release_shm_symheap
+#undef FCNAME
+#define FCNAME MPL_QUOTE(FUNCNAME)
+static inline int MPIDI_CH4R_release_shm_symheap(MPI_Aint shm_size, MPIR_Win * win, int seg_num)
+{
+    int mpi_errno = MPI_SUCCESS;
+
+#ifdef USE_SYM_HEAP
+    MPL_shm_hnd_t *shm_segment_hdl_ptr = &MPIDI_CH4U_WIN(win, shm_segment_handle[seg_num]);
+    void *base_ptr = MPIDI_CH4U_WIN(win, mmap_addr[seg_num]);
+
+    /* destroy successful shm segment */
+    mpi_errno = MPIDI_CH4U_destroy_shm_segment(shm_size, shm_segment_hdl_ptr, base_ptr);
+    if (mpi_errno)
+        MPIR_ERR_POP(mpi_errno);
+#endif
+
+  fn_exit:
+    return mpi_errno;
+  fn_fail:
+    goto fn_exit;
+}
+
 #endif /* CH4R_SYMHEAP_H_INCLUDED */