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Subject[PATCH v1 3/9] perf util: Reconstruct rblist for supporting per-thread shadow stats
Date
In current stat-shadow.c, the rblist deleting is ignored.

The patch reconstructs the codes of rblist init/free, and adds
the implementation to node_delete method of rblist.

This patch also does:

1. Add the 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.

2. Create a static runtime_stat variable 'rt_stat' which
will log the shadow metrics by default.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
tools/perf/util/stat-shadow.c | 62 ++++++++++++++++++++++++++++++++++++++++---
tools/perf/util/stat.h | 2 ++
2 files changed, 60 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index 5853901..045e129 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -40,12 +40,16 @@ static struct stats runtime_aperf_stats[NUM_CTX][MAX_NR_CPUS];
static struct rblist runtime_saved_values;
static bool have_frontend_stalled;

+static struct runtime_stat rt_stat;
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 +62,23 @@ static int saved_value_cmp(struct rb_node *rb_node, const void *entry)

if (a->cpu != b->cpu)
return a->cpu - b->cpu;
+
+ 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)
@@ -76,6 +97,17 @@ static struct rb_node *saved_value_new(struct rblist *rblist __maybe_unused,
return &nd->rb_node;
}

+static void saved_value_delete(struct rblist *rblist __maybe_unused,
+ struct rb_node *rb_node)
+{
+ struct saved_value *v = container_of(rb_node,
+ struct saved_value,
+ rb_node);
+
+ if (v)
+ free(v);
+}
+
static struct saved_value *saved_value_lookup(struct perf_evsel *evsel,
int cpu,
bool create)
@@ -97,13 +129,35 @@ static struct saved_value *saved_value_lookup(struct perf_evsel *evsel,
return NULL;
}

+static void init_saved_rblist(struct rblist *rblist)
+{
+ rblist__init(rblist);
+ rblist->node_cmp = saved_value_cmp;
+ rblist->node_new = saved_value_new;
+ rblist->node_delete = saved_value_delete;
+}
+
+static void free_saved_rblist(struct rblist *rblist)
+{
+ rblist__reset(rblist);
+}
+
+void perf_stat__init_runtime_stat(struct runtime_stat *stat)
+{
+ memset(stat, 0, sizeof(struct runtime_stat));
+ init_saved_rblist(&stat->value_list);
+}
+
+void perf_stat__free_runtime_stat(struct runtime_stat *stat)
+{
+ free_saved_rblist(&stat->value_list);
+}
+
void perf_stat__init_shadow_stats(void)
{
have_frontend_stalled = pmu_have_event("cpu", "stalled-cycles-frontend");
- rblist__init(&runtime_saved_values);
- runtime_saved_values.node_cmp = saved_value_cmp;
- runtime_saved_values.node_new = saved_value_new;
- /* No delete for now */
+ memset(&walltime_nsecs_stats, 0, sizeof(walltime_nsecs_stats));
+ perf_stat__init_runtime_stat(&rt_stat);
}

static int evsel_context(struct perf_evsel *evsel)
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index 61fd2e0..4eb081d 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -126,6 +126,8 @@ typedef void (*print_metric_t)(void *ctx, const char *color, const char *unit,
const char *fmt, double val);
typedef void (*new_line_t )(void *ctx);

+void perf_stat__init_runtime_stat(struct runtime_stat *stat);
+void perf_stat__free_runtime_stat(struct runtime_stat *stat);
void perf_stat__init_shadow_stats(void);
void perf_stat__reset_shadow_stats(void);
void perf_stat__update_shadow_stats(struct perf_evsel *counter, u64 count,
--
2.7.4
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