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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>
This commit is contained in:
Frederic Weisbecker 2009-07-01 05:35:14 +02:00 committed by Ingo Molnar
parent 9198aa77b6
commit 4424961ad6
3 changed files with 90 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

102
tools/perf/builtin-report.c
View File

@ -794,8 +794,15 @@ callchain__fprintf(FILE *fp, struct callchain_node *self, u64 total_samples)
ret += callchain__fprintf(fp, self->parent, total_samples);
list_for_each_entry(chain, &self->val, list)
ret += fprintf(fp, " %p\n", (void *)chain->ip);
list_for_each_entry(chain, &self->val, list) {
if (chain->ip >= PERF_CONTEXT_MAX)
continue;
if (chain->sym)
ret += fprintf(fp, " %s\n", chain->sym->name);
else
ret += fprintf(fp, " %p\n",
(void *)chain->ip);
}
return ret;
}
@ -930,6 +937,55 @@ static int call__match(struct symbol *sym)
return 0;
}
static struct symbol **
resolve_callchain(struct thread *thread, struct map *map,
struct ip_callchain *chain, struct hist_entry *entry)
{
int i;
struct symbol **syms;
u64 context = PERF_CONTEXT_MAX;
if (callchain) {
syms = calloc(chain->nr, sizeof(*syms));
if (!syms) {
fprintf(stderr, "Can't allocate memory for symbols\n");
exit(-1);
}
}
for (i = 0; i < chain->nr; i++) {
u64 ip = chain->ips[i];
struct dso *dso = NULL;
struct symbol *sym;
if (ip >= PERF_CONTEXT_MAX) {
context = ip;
continue;
}
switch (context) {
case PERF_CONTEXT_KERNEL:
dso = kernel_dso;
break;
default:
break;
}
sym = resolve_symbol(thread, NULL, &dso, &ip);
if (sym) {
if (sort__has_parent && call__match(sym) &&
!entry->parent)
entry->parent = sym;
if (!callchain)
break;
syms[i] = sym;
}
}
return syms;
}
/*
* collect histogram counts
*/
@ -942,6 +998,7 @@ hist_entry__add(struct thread *thread, struct map *map, struct dso *dso,
struct rb_node **p = &hist.rb_node;
struct rb_node *parent = NULL;
struct hist_entry *he;
struct symbol **syms = NULL;
struct hist_entry entry = {
.thread = thread,
.map = map,
@ -955,39 +1012,11 @@ hist_entry__add(struct thread *thread, struct map *map, struct dso *dso,
};
int cmp;
if (sort__has_parent && chain) {
u64 context = PERF_CONTEXT_MAX;
int i;
for (i = 0; i < chain->nr; i++) {
u64 ip = chain->ips[i];
struct dso *dso = NULL;
struct symbol *sym;
if (ip >= PERF_CONTEXT_MAX) {
context = ip;
continue;
}
switch (context) {
case PERF_CONTEXT_HV:
dso = hypervisor_dso;
break;
case PERF_CONTEXT_KERNEL:
dso = kernel_dso;
break;
default:
break;
}
sym = resolve_symbol(thread, NULL, &dso, &ip);
if (sym && call__match(sym)) {
entry.parent = sym;
break;
}
}
}
if ((sort__has_parent || callchain) && chain)
syms = resolve_callchain(thread, map, chain, &entry);
while (*p != NULL) {
parent = *p;
@ -997,8 +1026,10 @@ hist_entry__add(struct thread *thread, struct map *map, struct dso *dso,
if (!cmp) {
he->count += count;
if (callchain)
append_chain(&he->callchain, chain);
if (callchain) {
append_chain(&he->callchain, chain, syms);
free(syms);
}
return 0;
}
@ -1014,7 +1045,8 @@ hist_entry__add(struct thread *thread, struct map *map, struct dso *dso,
*he = entry;
if (callchain) {
callchain_init(&he->callchain);
append_chain(&he->callchain, chain);
append_chain(&he->callchain, chain, syms);
free(syms);
}
rb_link_node(&he->rb_node, parent, p);
rb_insert_color(&he->rb_node, &hist);

33
tools/perf/util/callchain.c
View File

@ -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);
}

5
tools/perf/util/callchain.h
View File

@ -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