tools/perf: Add mem_hops field in perf_mem_data_src structure

Going forward, future generation systems can have more hierarchy
within the node/package level but currently we don't have any data source
encoding field in perf, which can be used to represent this level of data.

Add a new field called 'mem_hops' in the perf_mem_data_src structure
which can be used to represent intra-node/package or inter-node/off-package
details. This field is of size 3 bits where PERF_MEM_HOPS_{NA, 0..6} value
can be used to present different hop levels data.

Also add corresponding macros to define mem_hop field values
and shift value.

Currently we define macro for HOPS_0 which corresponds
to data coming from another core but same node.

Add functionality to represent mem_hop field data in
perf_mem__lvl_scnprintf function with the help of added string
array called mem_hops.

For ex: Encodings for mem_hops fields with L2 cache:

L2                      - local L2
L2 | REMOTE | HOPS_0    - remote core, same node L2

Since with the addition of HOPS field, now remote can be used to
denote cache access from the same node but different core, a check
is added in the c2c_decode_stats function to set mrem only when HOPS
is zero along with set remote field.

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20211006140654.298352-4-kjain@linux.ibm.com

1 files changed, 18 insertions, 1 deletions

diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index ff7289e28192..3167b4628b6d 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -301,6 +301,16 @@ static const char * const mem_lvlnum[] = {
 	[PERF_MEM_LVLNUM_NA] = "N/A",
 };
 
+static const char * const mem_hops[] = {
+	"N/A",
+	/*
+	 * While printing, 'Remote' will be added to represent
+	 * 'Remote core, same node' accesses as remote field need
+	 * to be set with mem_hops field.
+	 */
+	"core, same node",
+};
+
 int perf_mem__lvl_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
 {
 	size_t i, l = 0;
@@ -325,6 +335,9 @@ int perf_mem__lvl_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
 		l += 7;
 	}
 
+	if (mem_info && mem_info->data_src.mem_hops)
+		l += scnprintf(out + l, sz - l, "%s ", mem_hops[mem_info->data_src.mem_hops]);
+
 	printed = 0;
 	for (i = 0; m && i < ARRAY_SIZE(mem_lvl); i++, m >>= 1) {
 		if (!(m & 0x1))
@@ -471,8 +484,12 @@ int c2c_decode_stats(struct c2c_stats *stats, struct mem_info *mi)
 	/*
 	 * Skylake might report unknown remote level via this
 	 * bit, consider it when evaluating remote HITMs.
+	 *
+	 * Incase of power, remote field can also be used to denote cache
+	 * accesses from the another core of same node. Hence, setting
+	 * mrem only when HOPS is zero along with set remote field.
 	 */
-	bool mrem  = data_src->mem_remote;
+	bool mrem  = (data_src->mem_remote && !data_src->mem_hops);
 	int err = 0;
 
 #define HITM_INC(__f)		\