[PATCH v3 5/6] perf tools: Show memory region in perf-script subcommand

From: Dapeng Mi <[email protected]>

Show the memory region in perf-script subcommand. Memory region is found
in the mem_region field of the memory information data source. This
field was included with the introduction of support for the Off-module
Response facility (OMR) [1] in Intel's Diamond Rapids and Nova Lake
Architectures.

An example of perf-script output with the new memory region field is shown
below:

random      10e6a100042 |OP LOAD|LVL L0 hit|SNP None|TLB L1 or L2 hit|LCK Yes|BLK  N/A|Region  N/A                           7f32ae64a2ec
random    2411a68201042 |OP LOAD|LVL RAM hit|SNP Hit|TLB L1 or L2 hit|LCK No|BLK  N/A|Region  Mem-1                          561de7f8910a
random      10e6a100042 |OP LOAD|LVL L0 hit|SNP None|TLB L1 or L2 hit|LCK Yes|BLK  N/A|Region  N/A                           7f32ae64a2d0
random      20e6a100042 |OP LOAD|LVL L0 hit|SNP None|TLB L1 or L2 hit|LCK Yes|BLK  Data|Region  N/A                          7f32ae64a2d0
random      20e6a100042 |OP LOAD|LVL L0 hit|SNP None|TLB L1 or L2 hit|LCK Yes|BLK  Data|Region  N/A                          7f32ae64a2d0
random      10e6a100042 |OP LOAD|LVL L0 hit|SNP None|TLB L1 or L2 hit|LCK Yes|BLK  N/A|Region  N/A                           7f32ae64a2ec
random      10e6a100042 |OP LOAD|LVL L0 hit|SNP None|TLB L1 or L2 hit|LCK Yes|BLK  N/A|Region  N/A                           7f32ae64a2d0
random      10e6a100042 |OP LOAD|LVL L0 hit|SNP None|TLB L1 or L2 hit|LCK Yes|BLK  N/A|Region  N/A                           7f32ae64a2d0
random    2411a68201042 |OP LOAD|LVL RAM hit|SNP Hit|TLB L1 or L2 hit|LCK No|BLK  N/A|Region  Mem-1                          561de7f8910a
random      10e6a100042 |OP LOAD|LVL L0 hit|SNP None|TLB L1 or L2 hit|LCK Yes|BLK  N/A|Region  N/A                           7f32ae64a2ec
random      10e6a100042 |OP LOAD|LVL L0 hit|SNP None|TLB L1 or L2 hit|LCK Yes|BLK  N/A|Region  N/A                           7f32ae64a2d0

[1]: https://lore.kernel.org/all/[email protected]/

Assisted-by: Sashiko:gemini-3.1-pro-preview
Assisted-by: GitHub-Copilot:claude-opus-4-8
Signed-off-by: Dapeng Mi <[email protected]>
Signed-off-by: Thomas Falcon <[email protected]>
Link: https://lore.kernel.org/all/[email protected]/
---
v3: make memory region reporting conditional on feature bit
---
 tools/perf/builtin-script.c                   | 11 ++-
 tools/perf/util/mem-events.c                  | 77 +++++++++++++++++++
 tools/perf/util/mem-events.h                  |  1 +
 .../scripting-engines/trace-event-python.c    |  4 +-
 4 files changed, 87 insertions(+), 6 deletions(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index f91d8b1fbd01..9ebf8dfe01c9 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -2081,8 +2081,8 @@ static int evlist__max_name_len(struct evlist *evlist)
 static int data_src__fprintf(u64 data_src, FILE *fp)
 {
 	struct mem_info *mi = mem_info__new();
-	char decode[100];
-	char out[100];
+	char decode[200];
+	char out[200];
 	static int maxlen;
 	int len;
 
@@ -2090,10 +2090,10 @@ static int data_src__fprintf(u64 data_src, FILE *fp)
 		return -ENOMEM;
 
 	mem_info__data_src(mi)->val = data_src;
-	perf_script__meminfo_scnprintf(decode, 100, mi);
+	perf_script__meminfo_scnprintf(decode, 200, mi);
 	mem_info__put(mi);
 
-	len = scnprintf(out, 100, "%16" PRIx64 " %s", data_src, decode);
+	len = scnprintf(out, 200, "%16" PRIx64 " %s", data_src, decode);
 	if (maxlen < len)
 		maxlen = len;
 
@@ -4470,6 +4470,9 @@ int cmd_script(int argc, const char **argv)
 	if (show_full_info)
 		script.tool.show_feat_hdr = SHOW_FEAT_HEADER_FULL_INFO;
 
+	perf_mem__set_show_region(perf_header__has_feat(&session->header,
+							HEADER_MEMORY_RANGES));
+
 	if (symbol__init(env) < 0)
 		goto out_delete;
 
diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index 4fd48fd20055..61f203508916 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -31,6 +31,13 @@ struct perf_mem_event perf_mem_events[PERF_MEM_EVENTS__MAX] = {
 
 bool perf_mem_record[PERF_MEM_EVENTS__MAX] = { 0 };
 
+static bool perf_mem__show_region = false;
+
+void perf_mem__set_show_region(bool val)
+{
+	perf_mem__show_region = val;
+}
+
 struct perf_mem_event *perf_pmu__mem_events_ptr(struct perf_pmu *pmu, int i)
 {
 	if (i >= PERF_MEM_EVENTS__MAX || !pmu)
@@ -604,6 +611,72 @@ int perf_mem__blk_scnprintf(char *out, size_t sz, const struct mem_info *mem_inf
 	return l;
 }
 
+static int perf_mem__region_scnprintf(char *out, size_t sz, const struct mem_info *mem_info)
+{
+	size_t l = 0;
+	u64 mem = PERF_MEM_REGION_NA;
+
+	sz -= 1; /* -1 for null termination */
+	out[0] = '\0';
+
+	if (mem_info)
+		mem = mem_info__const_data_src(mem_info)->mem_region;
+
+	switch (mem) {
+	case PERF_MEM_REGION_NA:
+	case PERF_MEM_REGION_RSVD:
+		l += scnprintf(out + l, sz - l, "N/A");
+		break;
+	case PERF_MEM_REGION_L_SHARE:
+		l += scnprintf(out + l, sz - l, "Local-shared-cache");
+		break;
+	case PERF_MEM_REGION_L_NON_SHARE:
+		l += scnprintf(out + l, sz - l, "Local-non-shared-cache");
+		break;
+	case PERF_MEM_REGION_O_IO:
+		l += scnprintf(out + l, sz - l, "Other-IO");
+		break;
+	case PERF_MEM_REGION_O_SHARE:
+		l += scnprintf(out + l, sz - l, "Other-shared-cache");
+		break;
+	case PERF_MEM_REGION_O_NON_SHARE:
+		l += scnprintf(out + l, sz - l, "Other-non-shared-cache");
+		break;
+	case PERF_MEM_REGION_MMIO:
+		l += scnprintf(out + l, sz - l, "MMIO");
+		break;
+	case PERF_MEM_REGION_MEM0:
+		l += scnprintf(out + l, sz - l, "Mem-0");
+		break;
+	case PERF_MEM_REGION_MEM1:
+		l += scnprintf(out + l, sz - l, "Mem-1");
+		break;
+	case PERF_MEM_REGION_MEM2:
+		l += scnprintf(out + l, sz - l, "Mem-2");
+		break;
+	case PERF_MEM_REGION_MEM3:
+		l += scnprintf(out + l, sz - l, "Mem-3");
+		break;
+	case PERF_MEM_REGION_MEM4:
+		l += scnprintf(out + l, sz - l, "Mem-4");
+		break;
+	case PERF_MEM_REGION_MEM5:
+		l += scnprintf(out + l, sz - l, "Mem-5");
+		break;
+	case PERF_MEM_REGION_MEM6:
+		l += scnprintf(out + l, sz - l, "Mem-6");
+		break;
+	case PERF_MEM_REGION_MEM7:
+		l += scnprintf(out + l, sz - l, "Mem-7");
+		break;
+	default:
+		l += scnprintf(out + l, sz - l, "N/A");
+		break;
+	}
+
+	return l;
+}
+
 int perf_script__meminfo_scnprintf(char *out, size_t sz, const struct mem_info *mem_info)
 {
 	int i = 0;
@@ -620,6 +693,10 @@ int perf_script__meminfo_scnprintf(char *out, size_t sz, const struct mem_info *
 	i += perf_mem__lck_scnprintf(out + i, sz - i, mem_info);
 	i += scnprintf(out + i, sz - i, "|BLK ");
 	i += perf_mem__blk_scnprintf(out + i, sz - i, mem_info);
+	if (perf_mem__show_region) {
+		i += scnprintf(out + i, sz - i, "|Region ");
+		i += perf_mem__region_scnprintf(out + i, sz - i, mem_info);
+	}
 
 	return i;
 }
diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
index daa22748f9fe..91fe57ce1859 100644
--- a/tools/perf/util/mem-events.h
+++ b/tools/perf/util/mem-events.h
@@ -146,5 +146,6 @@ enum mem_stat_dtlb {
 
 int mem_stat_index(const enum mem_stat_type mst, const u64 data_src);
 const char *mem_stat_name(const enum mem_stat_type mst, const int idx);
+void perf_mem__set_show_region(bool val);
 
 #endif /* __PERF_MEM_EVENTS_H */
diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index 8f832ae316ca..57ec259897e4 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -695,7 +695,7 @@ static void set_sample_datasrc_in_dict(PyObject *dict,
 				      struct perf_sample *sample)
 {
 	struct mem_info *mi = mem_info__new();
-	char decode[100];
+	char decode[200];
 
 	if (!mi)
 		Py_FatalError("couldn't create mem-info");
@@ -704,7 +704,7 @@ static void set_sample_datasrc_in_dict(PyObject *dict,
 			PyLong_FromUnsignedLongLong(sample->data_src));
 
 	mem_info__data_src(mi)->val = sample->data_src;
-	perf_script__meminfo_scnprintf(decode, 100, mi);
+	perf_script__meminfo_scnprintf(decode, 200, mi);
 	mem_info__put(mi);
 
 	pydict_set_item_string_decref(dict, "datasrc_decode",
-- 
2.55.0