perf hists: Add support for accumulated stat of hist entry

Maintain accumulated stat information in hist_entry->stat_acc if
symbol_conf.cumulate_callchain is set.  Fields in ->stat_acc have same
vaules initially, and will be updated as callchain is processed later.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arun Sharma <asharma@fb.com>
Tested-by: Rodrigo Campos <rodrigo@sdfg.com.ar>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/1401335910-16832-4-git-send-email-namhyung@kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

3 files changed, 28 insertions, 2 deletions

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index d8662356de20..dfff2ee8effb 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -232,6 +232,8 @@ static bool hists__decay_entry(struct hists *hists, struct hist_entry *he)
                 return true;
 
         he_stat__decay(&he->stat);
+        if (symbol_conf.cumulate_callchain)
+                he_stat__decay(he->stat_acc);
 
         diff = prev_period - he->stat.period;
 
@@ -279,12 +281,26 @@ void hists__decay_entries(struct hists *hists, bool zap_user, bool zap_kernel)
 
 static struct hist_entry *hist_entry__new(struct hist_entry *template)
 {
-        size_t callchain_size = symbol_conf.use_callchain ? sizeof(struct callchain_root) : 0;
-        struct hist_entry *he = zalloc(sizeof(*he) + callchain_size);
+        size_t callchain_size = 0;
+        struct hist_entry *he;
+
+        if (symbol_conf.use_callchain || symbol_conf.cumulate_callchain)
+                callchain_size = sizeof(struct callchain_root);
+
+        he = zalloc(sizeof(*he) + callchain_size);
 
         if (he != NULL) {
                 *he = *template;
 
+                if (symbol_conf.cumulate_callchain) {
+                        he->stat_acc = malloc(sizeof(he->stat));
+                        if (he->stat_acc == NULL) {
+                                free(he);
+                                return NULL;
+                        }
+                        memcpy(he->stat_acc, &he->stat, sizeof(he->stat));
+                }
+
                 if (he->ms.map)
                         he->ms.map->referenced = true;
 
@@ -296,6 +312,7 @@ static struct hist_entry *hist_entry__new(struct hist_entry *template)
                          */
                         he->branch_info = malloc(sizeof(*he->branch_info));
                         if (he->branch_info == NULL) {
+                                free(he->stat_acc);
                                 free(he);
                                 return NULL;
                         }
@@ -359,6 +376,8 @@ static struct hist_entry *add_hist_entry(struct hists *hists,
 
                 if (!cmp) {
                         he_stat__add_period(&he->stat, period, weight);
+                        if (symbol_conf.cumulate_callchain)
+                                he_stat__add_period(he->stat_acc, period, weight);
 
                         /*
                          * This mem info was allocated from sample__resolve_mem
@@ -394,6 +413,8 @@ static struct hist_entry *add_hist_entry(struct hists *hists,
         rb_insert_color(&he->rb_node_in, hists->entries_in);
 out:
         he_stat__add_cpumode_period(&he->stat, al->cpumode, period);
+        if (symbol_conf.cumulate_callchain)
+                he_stat__add_cpumode_period(he->stat_acc, al->cpumode, period);
         return he;
 }
 
@@ -768,6 +789,7 @@ void hist_entry__free(struct hist_entry *he)
 {
         zfree(&he->branch_info);
         zfree(&he->mem_info);
+        zfree(&he->stat_acc);
         free_srcline(he->srcline);
         free(he);
 }
@@ -793,6 +815,8 @@ static bool hists__collapse_insert_entry(struct hists *hists __maybe_unused,
 
                 if (!cmp) {
                         he_stat__add_stat(&iter->stat, &he->stat);
+                        if (symbol_conf.cumulate_callchain)
+                                he_stat__add_stat(iter->stat_acc, he->stat_acc);
 
                         if (symbol_conf.use_callchain) {
                                 callchain_cursor_reset(&callchain_cursor);
diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index 5f38d925e92f..c9ffa031becd 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -82,6 +82,7 @@ struct hist_entry {
                 struct list_head head;
         } pairs;
         struct he_stat          stat;
+        struct he_stat          *stat_acc;
         struct map_symbol       ms;
         struct thread           *thread;
         struct comm             *comm;
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 33ede53fa6b9..615c752dd767 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -109,6 +109,7 @@ struct symbol_conf {
                         show_nr_samples,
                         show_total_period,
                         use_callchain,
+                        cumulate_callchain,
                         exclude_other,
                         show_cpu_utilization,
                         initialized,