perf report: Cache srclines for callchain nodes

On one hand this ensures that the memory is properly freed when the DSO
gets freed. On the other hand this significantly speeds up the
processing of the callchain nodes when lots of srclines are requested.
For one of my data files e.g.:

Before:

 Performance counter stats for 'perf report -s srcline -g srcline --stdio':

      52496.495043      task-clock (msec)         #    0.999 CPUs utilized
               634      context-switches          #    0.012 K/sec
                 2      cpu-migrations            #    0.000 K/sec
           191,561      page-faults               #    0.004 M/sec
   165,074,498,235      cycles                    #    3.144 GHz
   334,170,832,408      instructions              #    2.02  insn per cycle
    90,220,029,745      branches                  # 1718.591 M/sec
       654,525,177      branch-misses             #    0.73% of all branches

      52.533273822 seconds time elapsedProcessed 236605 events and lost 40 chunks!

After:

 Performance counter stats for 'perf report -s srcline -g srcline --stdio':

      22606.323706      task-clock (msec)         #    1.000 CPUs utilized
                31      context-switches          #    0.001 K/sec
                 0      cpu-migrations            #    0.000 K/sec
           185,471      page-faults               #    0.008 M/sec
    71,188,113,681      cycles                    #    3.149 GHz
   133,204,943,083      instructions              #    1.87  insn per cycle
    34,886,384,979      branches                  # 1543.214 M/sec
       278,214,495      branch-misses             #    0.80% of all branches

      22.609857253 seconds time elapsed

Note that the difference is only this large when `--inline` is not
passed. In such situations, we would use the inliner cache and thus do
not run this code path that often.

I think that this cache should actually be used in other places, too.
When looking at the valgrind leak report for perf report, we see tons of
srclines being leaked, most notably from calls to
hist_entry__get_srcline. The problem is that get_srcline has many
different formatting options (show_sym, show_addr, potentially even
unwind_inlines when calling __get_srcline directly). As such, the
srcline cannot easily be cached for all calls, or we'd have to add
caches for all formatting combinations (6 so far). An alternative would
be to remove the formatting options and handle that on a different level
- i.e. print the sym/addr on demand wherever we actually output
something. And the unwind_inlines could be moved into a separate
function that does not return the srcline.

Signed-off-by: Milian Wolff <[email protected]>
Reviewed-by: Andi Kleen <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Jin Yao <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: milianw

tools/perf/util/dso.c

@@ -1203,6 +1203,7 @@ struct dso *dso__new(const char *name)
 			dso->symbols[i] = dso->symbol_names[i] = RB_ROOT;
 		dso->data.cache = RB_ROOT;
 		dso->inlined_nodes = RB_ROOT;
+		dso->srclines = RB_ROOT;
 		dso->data.fd = -1;
 		dso->data.status = DSO_DATA_STATUS_UNKNOWN;
 		dso->symtab_type = DSO_BINARY_TYPE__NOT_FOUND;
@@ -1237,6 +1238,7 @@ void dso__delete(struct dso *dso)
 
 	/* free inlines first, as they reference symbols */
 	inlines__tree_delete(&dso->inlined_nodes);
+	srcline__tree_delete(&dso->srclines);
 	for (i = 0; i < MAP__NR_TYPES; ++i)
 		symbols__delete(&dso->symbols[i]);
 

tools/perf/util/dso.h

@@ -142,6 +142,7 @@ struct dso {
 	struct rb_root	 symbols[MAP__NR_TYPES];
 	struct rb_root	 symbol_names[MAP__NR_TYPES];
 	struct rb_root	 inlined_nodes;
+	struct rb_root	 srclines;
 	struct {
 		u64		addr;
 		struct symbol	*symbol;

tools/perf/util/machine.c

@@ -1711,11 +1711,22 @@ struct mem_info *sample__resolve_mem(struct perf_sample *sample,
 
 static char *callchain_srcline(struct map *map, struct symbol *sym, u64 ip)
 {
+	char *srcline = NULL;
+
 	if (!map || callchain_param.key == CCKEY_FUNCTION)
-		return NULL;
+		return srcline;
+
+	srcline = srcline__tree_find(&map->dso->srclines, ip);
+	if (!srcline) {
+		bool show_sym = false;
+		bool show_addr = callchain_param.key == CCKEY_ADDRESS;
+
+		srcline = get_srcline(map->dso, map__rip_2objdump(map, ip),
+				      sym, show_sym, show_addr);
+		srcline__tree_insert(&map->dso->srclines, ip, srcline);
+	}
 
-	return get_srcline(map->dso, map__rip_2objdump(map, ip),
-			   sym, false, callchain_param.key == CCKEY_ADDRESS);
+	return srcline;
 }
 
 struct iterations {

tools/perf/util/srcline.c

@@ -542,6 +542,72 @@ char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
 	return __get_srcline(dso, addr, sym, show_sym, show_addr, false);
 }
 
+struct srcline_node {
+	u64			addr;
+	char			*srcline;
+	struct rb_node		rb_node;
+};
+
+void srcline__tree_insert(struct rb_root *tree, u64 addr, char *srcline)
+{
+	struct rb_node **p = &tree->rb_node;
+	struct rb_node *parent = NULL;
+	struct srcline_node *i, *node;
+
+	node = zalloc(sizeof(struct srcline_node));
+	if (!node) {
+		perror("not enough memory for the srcline node");
+		return;
+	}
+
+	node->addr = addr;
+	node->srcline = srcline;
+
+	while (*p != NULL) {
+		parent = *p;
+		i = rb_entry(parent, struct srcline_node, rb_node);
+		if (addr < i->addr)
+			p = &(*p)->rb_left;
+		else
+			p = &(*p)->rb_right;
+	}
+	rb_link_node(&node->rb_node, parent, p);
+	rb_insert_color(&node->rb_node, tree);
+}
+
+char *srcline__tree_find(struct rb_root *tree, u64 addr)
+{
+	struct rb_node *n = tree->rb_node;
+
+	while (n) {
+		struct srcline_node *i = rb_entry(n, struct srcline_node,
+						  rb_node);
+
+		if (addr < i->addr)
+			n = n->rb_left;
+		else if (addr > i->addr)
+			n = n->rb_right;
+		else
+			return i->srcline;
+	}
+
+	return NULL;
+}
+
+void srcline__tree_delete(struct rb_root *tree)
+{
+	struct srcline_node *pos;
+	struct rb_node *next = rb_first(tree);
+
+	while (next) {
+		pos = rb_entry(next, struct srcline_node, rb_node);
+		next = rb_next(&pos->rb_node);
+		rb_erase(&pos->rb_node, tree);
+		free_srcline(pos->srcline);
+		zfree(&pos);
+	}
+}
+
 struct inline_node *dso__parse_addr_inlines(struct dso *dso, u64 addr,
 					    struct symbol *sym)
 {

tools/perf/util/srcline.h

@@ -15,6 +15,13 @@ char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
 		  bool show_sym, bool show_addr, bool unwind_inlines);
 void free_srcline(char *srcline);
 
+/* insert the srcline into the DSO, which will take ownership */
+void srcline__tree_insert(struct rb_root *tree, u64 addr, char *srcline);
+/* find previously inserted srcline */
+char *srcline__tree_find(struct rb_root *tree, u64 addr);
+/* delete all srclines within the tree */
+void srcline__tree_delete(struct rb_root *tree);
+
 #define SRCLINE_UNKNOWN  ((char *) "??:0")
 
 struct inline_list {