[PATCH v2 4/6] perf tools: Show memory region in perf-script subcommand
From: Thomas Falcon
Date: Mon Jul 13 2026 - 20:45:12 EST
From: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
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/20260114011750.350569-1-dapeng1.mi@xxxxxxxxxxxxxxx/
Signed-off-by: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
Signed-off-by: Thomas Falcon <thomas.falcon@xxxxxxxxx>
---
Changes in v2:
-- increased buffers passed to perf_script__meminfo_scnprintf() from 150
to 200 bytes to avoid silent truncation
---
tools/perf/builtin-script.c | 8 +--
tools/perf/util/mem-events.c | 68 +++++++++++++++++++
.../scripting-engines/trace-event-python.c | 4 +-
3 files changed, 74 insertions(+), 6 deletions(-)
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index f91d8b1fbd01..ba8ec0093f4f 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;
diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index 4fd48fd20055..ff08f1fee0e3 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -604,6 +604,72 @@ 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 +686,8 @@ 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);
+ 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/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",
--
2.43.0