openmp: Add support for OMP_PLACES=numa_domains

This adds support for numa_domains abstract name in OMP_PLACES, also new
in OpenMP 5.1.

Way to test this is
OMP_PLACES=numa_domains OMP_DISPLAY_ENV=true LD_PRELOAD=.libs/libgomp.so.1 /bin/true
and see what it prints on OMP_PLACES line.
For non-NUMA machines it should print a single place that covers all CPUs,
for NUMA machine one place for each NUMA node with corresponding CPUs.

2021-10-15  Jakub Jelinek  <jakub@redhat.com>

	* env.c (parse_places_var): Handle numa_domains as level 5.
	* config/linux/affinity.c (gomp_affinity_init_numa_domains): New
	function.
	(gomp_affinity_init_level): Use it instead of
	gomp_affinity_init_level_1 for level == 5.
	* testsuite/libgomp.c/places-5.c: New test.

1 files changed, 10 insertions, 0 deletions

diff --git a/libgomp/testsuite/libgomp.c/places-5.c b/libgomp/testsuite/libgomp.c/places-5.c
new file mode 100644
index 0000000..5f1e595
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c/places-5.c
@@ -0,0 +1,10 @@
+/* { dg-set-target-env-var OMP_PLACES "numa_domains" } */
+
+#include <omp.h>
+
+int
+main ()
+{
+  omp_display_env (0);
+  return 0;
+}