perf top: Don't allocate the source parsing members upfront

Defer to parse_source() time allocating it.

Now we use about this much memory:

 1724 root      20   0 42104  10m  940 S  0.0  0.4   0:00.23 perf

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1258490282-1821-3-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 45 insertions, 31 deletions

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 49cf87680fe3..07b92c378ae2 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -108,6 +108,13 @@ static int			display_weighted		=     -1;
  * Symbols
  */
 
+struct sym_entry_source {
+        struct source_line      *source;
+        struct source_line      *lines;
+        struct source_line      **lines_tail;
+        pthread_mutex_t         lock;
+};
+
 struct sym_entry {
         struct rb_node          rb_node;
         struct list_head        node;
@@ -117,10 +124,7 @@ struct sym_entry {
         u16                     name_len;
         u8                      origin;
         struct map              *map;
-        struct source_line      *source;
-        struct source_line      *lines;
-        struct source_line      **lines_tail;
-        pthread_mutex_t         source_lock;
+        struct sym_entry_source *src;
         unsigned long           count[0];
 };
 
@@ -172,6 +176,7 @@ static void sig_winch_handler(int sig __used)
 static void parse_source(struct sym_entry *syme)
 {
         struct symbol *sym;
+        struct sym_entry_source *source;
         struct map *map;
         FILE *file;
         char command[PATH_MAX*2];
@@ -181,8 +186,17 @@ static void parse_source(struct sym_entry *syme)
         if (!syme)
                 return;
 
-        if (syme->lines) {
-                pthread_mutex_lock(&syme->source_lock);
+        if (syme->src == NULL) {
+                syme->src = calloc(1, sizeof(*source));
+                if (syme->src == NULL)
+                        return;
+                pthread_mutex_init(&syme->src->lock, NULL);
+        }
+
+        source = syme->src;
+
+        if (source->lines) {
+                pthread_mutex_lock(&source->lock);
                 goto out_assign;
         }
 
@@ -202,8 +216,8 @@ static void parse_source(struct sym_entry *syme)
         if (!file)
                 return;
 
-        pthread_mutex_lock(&syme->source_lock);
-        syme->lines_tail = &syme->lines;
+        pthread_mutex_lock(&source->lock);
+        source->lines_tail = &source->lines;
         while (!feof(file)) {
                 struct source_line *src;
                 size_t dummy = 0;
@@ -223,8 +237,8 @@ static void parse_source(struct sym_entry *syme)
                         *c = 0;
 
                 src->next = NULL;
-                *syme->lines_tail = src;
-                syme->lines_tail = &src->next;
+                *source->lines_tail = src;
+                source->lines_tail = &src->next;
 
                 if (strlen(src->line)>8 && src->line[8] == ':') {
                         src->eip = strtoull(src->line, NULL, 16);
@@ -238,7 +252,7 @@ static void parse_source(struct sym_entry *syme)
         pclose(file);
 out_assign:
         sym_filter_entry = syme;
-        pthread_mutex_unlock(&syme->source_lock);
+        pthread_mutex_unlock(&source->lock);
 }
 
 static void __zero_source_counters(struct sym_entry *syme)
@@ -246,7 +260,7 @@ static void __zero_source_counters(struct sym_entry *syme)
         int i;
         struct source_line *line;
 
-        line = syme->lines;
+        line = syme->src->lines;
         while (line) {
                 for (i = 0; i < nr_counters; i++)
                         line->count[i] = 0;
@@ -261,13 +275,13 @@ static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
         if (syme != sym_filter_entry)
                 return;
 
-        if (pthread_mutex_trylock(&syme->source_lock))
+        if (pthread_mutex_trylock(&syme->src->lock))
                 return;
 
-        if (!syme->source)
+        if (syme->src == NULL || syme->src->source == NULL)
                 goto out_unlock;
 
-        for (line = syme->lines; line; line = line->next) {
+        for (line = syme->src->lines; line; line = line->next) {
                 if (line->eip == ip) {
                         line->count[counter]++;
                         break;
@@ -276,7 +290,7 @@ static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
                         break;
         }
 out_unlock:
-        pthread_mutex_unlock(&syme->source_lock);
+        pthread_mutex_unlock(&syme->src->lock);
 }
 
 static void lookup_sym_source(struct sym_entry *syme)
@@ -287,14 +301,14 @@ static void lookup_sym_source(struct sym_entry *syme)
 
         sprintf(pattern, "<%s>:", symbol->name);
 
-        pthread_mutex_lock(&syme->source_lock);
-        for (line = syme->lines; line; line = line->next) {
+        pthread_mutex_lock(&syme->src->lock);
+        for (line = syme->src->lines; line; line = line->next) {
                 if (strstr(line->line, pattern)) {
-                        syme->source = line;
+                        syme->src->source = line;
                         break;
                 }
         }
-        pthread_mutex_unlock(&syme->source_lock);
+        pthread_mutex_unlock(&syme->src->lock);
 }
 
 static void show_lines(struct source_line *queue, int count, int total)
@@ -324,24 +338,24 @@ static void show_details(struct sym_entry *syme)
         if (!syme)
                 return;
 
-        if (!syme->source)
+        if (!syme->src->source)
                 lookup_sym_source(syme);
 
-        if (!syme->source)
+        if (!syme->src->source)
                 return;
 
         symbol = sym_entry__symbol(syme);
         printf("Showing %s for %s\n", event_name(sym_counter), symbol->name);
         printf("  Events  Pcnt (>=%d%%)\n", sym_pcnt_filter);
 
-        pthread_mutex_lock(&syme->source_lock);
-        line = syme->source;
+        pthread_mutex_lock(&syme->src->lock);
+        line = syme->src->source;
         while (line) {
                 total += line->count[sym_counter];
                 line = line->next;
         }
 
-        line = syme->source;
+        line = syme->src->source;
         while (line) {
                 float pcnt = 0.0;
 
@@ -366,7 +380,7 @@ static void show_details(struct sym_entry *syme)
                 line->count[sym_counter] = zero ? 0 : line->count[sym_counter] * 7 / 8;
                 line = line->next;
         }
-        pthread_mutex_unlock(&syme->source_lock);
+        pthread_mutex_unlock(&syme->src->lock);
         if (more)
                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
 }
@@ -647,10 +661,10 @@ static void prompt_symbol(struct sym_entry **target, const char *msg)
 
         /* zero counters of active symbol */
         if (syme) {
-                pthread_mutex_lock(&syme->source_lock);
+                pthread_mutex_lock(&syme->src->lock);
                 __zero_source_counters(syme);
                 *target = NULL;
-                pthread_mutex_unlock(&syme->source_lock);
+                pthread_mutex_unlock(&syme->src->lock);
         }
 
         fprintf(stdout, "\n%s: ", msg);
@@ -826,10 +840,10 @@ static void handle_keypress(int c)
                         else {
                                 struct sym_entry *syme = sym_filter_entry;
 
-                                pthread_mutex_lock(&syme->source_lock);
+                                pthread_mutex_lock(&syme->src->lock);
                                 sym_filter_entry = NULL;
                                 __zero_source_counters(syme);
-                                pthread_mutex_unlock(&syme->source_lock);
+                                pthread_mutex_unlock(&syme->src->lock);
                         }
                         break;
                 case 'U':
@@ -915,7 +929,7 @@ static int symbol_filter(struct map *map, struct symbol *sym)
 
         syme = symbol__priv(sym);
         syme->map = map;
-        pthread_mutex_init(&syme->source_lock, NULL);
+        syme->src = NULL;
         if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter))
                 sym_filter_entry = syme;