[RFC PATCH v2 2/4] perf: Save cache instance ID when saving cache topology data

[K Prateek Nayak]

Bump up the version and save the cache instance ID when saving cache
topology information. When reading the topology information,
conditionally parse the instance ID for newer versions only.

Signed-off-by: K Prateek Nayak <kprateek.nayak@xxxxxxx>
---
 tools/perf/util/header.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index a938738f8775..2daaee5065ef 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1269,7 +1269,7 @@ static int write_cache(struct feat_fd *ff,
 {
 	u32 max_caches = cpu__max_cpu().cpu * MAX_CACHE_LVL;
 	struct cpu_cache_level caches[max_caches];
-	u32 cnt = 0, i, version = 1;
+	u32 cnt = 0, i, version = 2;
 	int ret;
 
 	ret = build_caches(caches, &cnt);
@@ -1295,6 +1295,7 @@ static int write_cache(struct feat_fd *ff,
 				goto out;
 
 		_W(level)
+		_W(id)
 		_W(line_size)
 		_W(sets)
 		_W(ways)
@@ -2886,7 +2887,7 @@ static int process_cache(struct feat_fd *ff, void *data __maybe_unused)
 	if (do_read_u32(ff, &version))
 		return -1;
 
-	if (version != 1)
+	if (version != 1 && version != 2)
 		return -1;
 
 	if (do_read_u32(ff, &cnt))
@@ -2904,6 +2905,8 @@ static int process_cache(struct feat_fd *ff, void *data __maybe_unused)
 				goto out_free_caches;			\
 
 		_R(level)
+		if (version >= 2)
+			_R(id)
 		_R(line_size)
 		_R(sets)
 		_R(ways)
-- 
2.34.1