[PATCH v6 02/11] perf stat: Extend rbtree to support per-thread shadow stats

[Jin Yao]

Previously the rbtree was used to link generic metrics.

This patches adds new ctx/type/stat into rbtree keys because we
will use this rbtree to maintain shadow metrics to replace original
a couple of static arrays for supporting per-thread shadow stats.

Signed-off-by: Jin Yao <yao....@linux.intel.com>
---
 tools/perf/util/stat-shadow.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index 93aac27..528be3e 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -45,7 +45,10 @@ struct stats walltime_nsecs_stats;
 struct saved_value {
        struct rb_node rb_node;
        struct perf_evsel *evsel;
+       enum stat_type type;
+       int ctx;
        int cpu;
+       struct runtime_stat *stat;
        struct stats stats;
 };
 
@@ -58,6 +61,30 @@ static int saved_value_cmp(struct rb_node *rb_node, const 
void *entry)
 
        if (a->cpu != b->cpu)
                return a->cpu - b->cpu;
+
+       /*
+        * Previously the rbtree was used to link generic metrics.
+        * The keys were evsel/cpu. Now the rbtree is extended to support
+        * per-thread shadow stats. For shadow stats case, the keys
+        * are cpu/type/ctx/stat (evsel is NULL). For generic metrics
+        * case, the keys are still evsel/cpu (type/ctx/stat are 0 or NULL).
+        */
+       if (a->type != b->type)
+               return a->type - b->type;
+
+       if (a->ctx != b->ctx)
+               return a->ctx - b->ctx;
+
+       if (a->evsel == NULL && b->evsel == NULL) {
+               if (a->stat == b->stat)
+                       return 0;
+
+               if ((char *)a->stat < (char *)b->stat)
+                       return -1;
+
+               return 1;
+       }
+
        if (a->evsel == b->evsel)
                return 0;
        if ((char *)a->evsel < (char *)b->evsel)
-- 
2.7.4