* [PATCH v5 1/4] memblock tests: add simulation of physical memory with multiple NUMA nodes
[not found] <cover.1662698159.git.remckee0@gmail.com>
@ 2022-09-09 4:46 ` Rebecca Mckeever
2022-09-09 11:41 ` David Hildenbrand
0 siblings, 1 reply; 2+ messages in thread
From: Rebecca Mckeever @ 2022-09-09 4:46 UTC (permalink / raw)
To: Mike Rapoport, linux-mm, linux-kernel; +Cc: David Hildenbrand, Rebecca Mckeever
Add function setup_numa_memblock() for setting up a memory layout with
multiple NUMA nodes in a previously allocated dummy physical memory.
This function can be used in place of setup_memblock() in tests that need
to simulate a NUMA system.
setup_numa_memblock():
- allows for setting up a memory layout by specifying the fraction of
MEM_SIZE in each node
Set CONFIG_NODES_SHIFT to 4 when building with NUMA=1 to allow for up to
16 NUMA nodes.
Signed-off-by: Rebecca Mckeever <remckee0@gmail.com>
---
.../testing/memblock/scripts/Makefile.include | 2 +-
tools/testing/memblock/tests/common.c | 31 +++++++++++++++++++
tools/testing/memblock/tests/common.h | 4 ++-
3 files changed, 35 insertions(+), 2 deletions(-)
diff --git a/tools/testing/memblock/scripts/Makefile.include b/tools/testing/memblock/scripts/Makefile.include
index aa6d82d56a23..998281723590 100644
--- a/tools/testing/memblock/scripts/Makefile.include
+++ b/tools/testing/memblock/scripts/Makefile.include
@@ -3,7 +3,7 @@
# Simulate CONFIG_NUMA=y
ifeq ($(NUMA), 1)
- CFLAGS += -D CONFIG_NUMA
+ CFLAGS += -D CONFIG_NUMA -D CONFIG_NODES_SHIFT=4
endif
# Use 32 bit physical addresses.
diff --git a/tools/testing/memblock/tests/common.c b/tools/testing/memblock/tests/common.c
index eec6901081af..9d9ad7df298b 100644
--- a/tools/testing/memblock/tests/common.c
+++ b/tools/testing/memblock/tests/common.c
@@ -9,6 +9,7 @@
#define INIT_MEMBLOCK_RESERVED_REGIONS INIT_MEMBLOCK_REGIONS
#define PREFIXES_MAX 15
#define DELIM ": "
+#define BASIS 10000
static struct test_memory memory_block;
static const char __maybe_unused *prefixes[PREFIXES_MAX];
@@ -72,6 +73,36 @@ void setup_memblock(void)
fill_memblock();
}
+/**
+ * setup_numa_memblock:
+ * Set up a memory layout with multiple NUMA nodes in a previously allocated
+ * dummy physical memory.
+ * @node_fracs: an array representing the fraction of MEM_SIZE contained in
+ * each node in basis point units (one hundredth of 1% or 1/10000).
+ * For example, if node 0 should contain 1/8 of MEM_SIZE,
+ * node_fracs[0] = 1250.
+ *
+ * The nids will be set to 0 through NUMA_NODES - 1.
+ */
+void setup_numa_memblock(const int node_fracs[])
+{
+ phys_addr_t base;
+ int flags;
+
+ reset_memblock_regions();
+ base = (phys_addr_t)memory_block.base;
+ flags = (movable_node_is_enabled()) ? MEMBLOCK_NONE : MEMBLOCK_HOTPLUG;
+
+ for (int i = 0; i < NUMA_NODES; i++) {
+ assert(node_fracs[i] <= BASIS && node_fracs[i] > 0);
+ phys_addr_t size = MEM_SIZE * node_fracs[i] / BASIS;
+
+ memblock_add_node(base, size, i, flags);
+ base += size;
+ }
+ fill_memblock();
+}
+
void dummy_physical_memory_init(void)
{
memory_block.base = malloc(MEM_SIZE);
diff --git a/tools/testing/memblock/tests/common.h b/tools/testing/memblock/tests/common.h
index 78128e109a95..f87ca5b3638e 100644
--- a/tools/testing/memblock/tests/common.h
+++ b/tools/testing/memblock/tests/common.h
@@ -10,7 +10,8 @@
#include <linux/printk.h>
#include <../selftests/kselftest.h>
-#define MEM_SIZE SZ_16K
+#define MEM_SIZE SZ_16K
+#define NUMA_NODES 8
enum test_flags {
/* No special request. */
@@ -102,6 +103,7 @@ struct region {
void reset_memblock_regions(void);
void reset_memblock_attributes(void);
void setup_memblock(void);
+void setup_numa_memblock(const int node_fracs[]);
void dummy_physical_memory_init(void);
void dummy_physical_memory_cleanup(void);
void parse_args(int argc, char **argv);
--
2.25.1
^ permalink raw reply [flat|nested] 2+ messages in thread