[PATCH v3 6/6] perf c2c: print memory region data with stdio output

Print memory range data in perf-c2c subcommand. Only available in stdio
mode currently. If memory ranges are not supported or present, print
nothing.

Example output of perf c2c report --stdio:

=================================================
                  Memory Ranges
=================================================
Range 0: [0x0000000000000000-0x00000000bfffffff] Node 0, local region id 0, remote region id 255
Range 1: [0x0000000100000000-0x000000203fffffff] Node 0, local region id 0, remote region id 255
Range 2: [0x0000008000000000-0x0000027fffffffff] Node -2, local region id 1, remote region id 255
Range 3: [0x0000028000000000-0x0000047fffffffff] Node -2, local region id 1, remote region id 255
Range 4: [0x0000048000000000-0x000004ffffffffff] Node -2, local region id 1, remote region id 255

Assisted-by: Sashiko:gemini-3.1-pro-preview
Signed-off-by: Thomas Falcon <[email protected]>
---
v3: Included examples of memory range output in commit message
---
 tools/perf/builtin-c2c.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index 6954a48c60e4..ce825fe6dfc6 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -2635,6 +2635,34 @@ static void print_c2c_info(FILE *out, struct perf_session *session)
 	fprintf(out, "  Cacheline data grouping           : %s\n", c2c.cl_sort);
 }
 
+
+static void print_memory_ranges_info(FILE *out, struct perf_session *session)
+{
+	struct perf_env *env = perf_session__env(session);
+	int nr_ranges = 0;
+
+	if (!perf_header__has_feat(&session->header, HEADER_MEMORY_RANGES))
+		return;
+	nr_ranges = env->nr_memory_ranges;
+	if (nr_ranges == 0) {
+		pr_debug("No memory ranges found, skipping\n");
+		return;
+	}
+
+	fprintf(out, "\n");
+	fprintf(out, "=================================================\n");
+	fprintf(out, "                  Memory Ranges                  \n");
+	fprintf(out, "=================================================\n");
+
+	for (int i = 0; i < nr_ranges; i++) {
+		struct memory_range *r = &env->memory_ranges[i];
+
+		fprintf(out, "Range %d: [0x%016" PRIx64 "-0x%016" PRIx64 "] Node %d, local region id %u, remote region id %u\n",
+			i, r->base, r->base + r->length - 1, r->node,
+			r->local_region_id, r->remote_region_id);
+	}
+}
+
 static void perf_c2c__hists_fprintf(FILE *out, struct perf_session *session)
 {
 	setup_pager();
@@ -2648,6 +2676,8 @@ static void perf_c2c__hists_fprintf(FILE *out, struct perf_session *session)
 	if (c2c.stats_only)
 		return;
 
+	print_memory_ranges_info(out, session);
+
 	fprintf(out, "\n");
 	fprintf(out, "=================================================\n");
 	fprintf(out, "           Shared Data Cache Line Table          \n");
-- 
2.55.0