perf_counter tools: Resolve symbols in callchains

This patch resolves the names, when possible, of each ip
present in the callchains while using the -c option with perf
report.

Example:

5.40%  [k] __d_lookup
             5.37%
                perf_callchain
                perf_counter_overflow
                intel_pmu_handle_irq
                perf_counter_nmi_handler
                notifier_call_chain
                atomic_notifier_call_chain
                notify_die
                do_nmi
                nmi
                do_lookup
                __link_path_walk
                path_walk
                do_path_lookup
                user_path_at
                sys_faccessat
                sys_access
                system_call_fastpath
                0x7fb609846f77

             0.01%
                perf_callchain
                perf_counter_overflow
                intel_pmu_handle_irq
                perf_counter_nmi_handler
                notifier_call_chain
                atomic_notifier_call_chain
                notify_die
                do_nmi
                nmi
                do_lookup
                __link_path_walk
                path_walk
                do_path_lookup
                user_path_at
                sys_faccessat

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Anton Blanchard <anton@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1246419315-9968-3-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 23 insertions, 15 deletions

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index bbf7813fefe0..6568cb198ba6 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -67,7 +67,8 @@ static struct callchain_node *create_child(struct callchain_node *parent)
 }
 
 static void
-fill_node(struct callchain_node *node, struct ip_callchain *chain, int start)
+fill_node(struct callchain_node *node, struct ip_callchain *chain, int start,
+          struct symbol **syms)
 {
         int i;
 
@@ -80,24 +81,26 @@ fill_node(struct callchain_node *node, struct ip_callchain *chain, int start)
                         return;
                 }
                 call->ip = chain->ips[i];
+                call->sym = syms[i];
                 list_add_tail(&call->list, &node->val);
         }
         node->val_nr = i - start;
 }
 
-static void add_child(struct callchain_node *parent, struct ip_callchain *chain)
+static void add_child(struct callchain_node *parent, struct ip_callchain *chain,
+                      struct symbol **syms)
 {
         struct callchain_node *new;
 
         new = create_child(parent);
-        fill_node(new, chain, parent->val_nr);
+        fill_node(new, chain, parent->val_nr, syms);
 
         new->hit = 1;
 }
 
 static void
 split_add_child(struct callchain_node *parent, struct ip_callchain *chain,
-                struct callchain_list *to_split, int idx)
+                struct callchain_list *to_split, int idx, struct symbol **syms)
 {
         struct callchain_node *new;
 
@@ -109,21 +112,22 @@ split_add_child(struct callchain_node *parent, struct ip_callchain *chain,
         parent->val_nr = idx;
 
         /* create the new one */
-        add_child(parent, chain);
+        add_child(parent, chain, syms);
 }
 
 static int
 __append_chain(struct callchain_node *root, struct ip_callchain *chain,
-                int start);
+               int start, struct symbol **syms);
 
 static int
-__append_chain_children(struct callchain_node *root, struct ip_callchain *chain)
+__append_chain_children(struct callchain_node *root, struct ip_callchain *chain,
+                        struct symbol **syms)
 {
         struct callchain_node *rnode;
 
         /* lookup in childrens */
         list_for_each_entry(rnode, &root->children, brothers) {
-                int ret = __append_chain(rnode, chain, root->val_nr);
+                int ret = __append_chain(rnode, chain, root->val_nr, syms);
                 if (!ret)
                         return 0;
         }
@@ -132,7 +136,7 @@ __append_chain_children(struct callchain_node *root, struct ip_callchain *chain)
 
 static int
 __append_chain(struct callchain_node *root, struct ip_callchain *chain,
-                int start)
+               int start, struct symbol **syms)
 {
         struct callchain_list *cnode;
         int i = start;
@@ -154,7 +158,7 @@ __append_chain(struct callchain_node *root, struct ip_callchain *chain,
 
         /* we match only a part of the node. Split it and add the new chain */
         if (i < root->val_nr) {
-                split_add_child(root, chain, cnode, i);
+                split_add_child(root, chain, cnode, i, syms);
                 return 0;
         }
 
@@ -164,11 +168,12 @@ __append_chain(struct callchain_node *root, struct ip_callchain *chain,
                 return 0;
         }
 
-        return __append_chain_children(root, chain);
+        return __append_chain_children(root, chain, syms);
 }
 
-void append_chain(struct callchain_node *root, struct ip_callchain *chain)
+void append_chain(struct callchain_node *root, struct ip_callchain *chain,
+                  struct symbol **syms)
 {
-        if (__append_chain_children(root, chain) == -1)
-                add_child(root, chain);
+        if (__append_chain_children(root, chain, syms) == -1)
+                add_child(root, chain, syms);
 }
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index fa1cd2f71fd3..c942daa712e6 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -4,6 +4,7 @@
 #include "../perf.h"
 #include "list.h"
 #include "rbtree.h"
+#include "symbol.h"
 
 
 struct callchain_node {
@@ -18,6 +19,7 @@ struct callchain_node {
 
 struct callchain_list {
         unsigned long           ip;
+        struct symbol           *sym;
         struct list_head        list;
 };
 
@@ -28,6 +30,7 @@ static inline void callchain_init(struct callchain_node *node)
         INIT_LIST_HEAD(&node->val);
 }
 
-void append_chain(struct callchain_node *root, struct ip_callchain *chain);
+void append_chain(struct callchain_node *root, struct ip_callchain *chain,
+                  struct symbol **syms);
 void sort_chain_to_rbtree(struct rb_root *rb_root, struct callchain_node *node);
 #endif