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>
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@ -794,8 +794,15 @@ callchain__fprintf(FILE *fp, struct callchain_node *self, u64 total_samples)
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ret += callchain__fprintf(fp, self->parent, total_samples);
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ret += callchain__fprintf(fp, self->parent, total_samples);
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list_for_each_entry(chain, &self->val, list)
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list_for_each_entry(chain, &self->val, list) {
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ret += fprintf(fp, " %p\n", (void *)chain->ip);
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if (chain->ip >= PERF_CONTEXT_MAX)
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continue;
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if (chain->sym)
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ret += fprintf(fp, " %s\n", chain->sym->name);
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else
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ret += fprintf(fp, " %p\n",
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(void *)chain->ip);
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}
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return ret;
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return ret;
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}
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}
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@ -930,6 +937,55 @@ static int call__match(struct symbol *sym)
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return 0;
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return 0;
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}
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}
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static struct symbol **
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resolve_callchain(struct thread *thread, struct map *map,
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struct ip_callchain *chain, struct hist_entry *entry)
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{
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int i;
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struct symbol **syms;
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u64 context = PERF_CONTEXT_MAX;
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if (callchain) {
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syms = calloc(chain->nr, sizeof(*syms));
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if (!syms) {
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fprintf(stderr, "Can't allocate memory for symbols\n");
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exit(-1);
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}
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}
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for (i = 0; i < chain->nr; i++) {
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u64 ip = chain->ips[i];
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struct dso *dso = NULL;
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struct symbol *sym;
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if (ip >= PERF_CONTEXT_MAX) {
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context = ip;
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continue;
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}
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switch (context) {
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case PERF_CONTEXT_KERNEL:
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dso = kernel_dso;
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break;
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default:
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break;
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}
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sym = resolve_symbol(thread, NULL, &dso, &ip);
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if (sym) {
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if (sort__has_parent && call__match(sym) &&
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!entry->parent)
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entry->parent = sym;
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if (!callchain)
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break;
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syms[i] = sym;
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}
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}
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return syms;
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}
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/*
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/*
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* collect histogram counts
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* collect histogram counts
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*/
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*/
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@ -942,6 +998,7 @@ hist_entry__add(struct thread *thread, struct map *map, struct dso *dso,
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struct rb_node **p = &hist.rb_node;
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struct rb_node **p = &hist.rb_node;
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struct rb_node *parent = NULL;
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struct rb_node *parent = NULL;
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struct hist_entry *he;
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struct hist_entry *he;
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struct symbol **syms = NULL;
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struct hist_entry entry = {
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struct hist_entry entry = {
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.thread = thread,
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.thread = thread,
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.map = map,
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.map = map,
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@ -955,39 +1012,11 @@ hist_entry__add(struct thread *thread, struct map *map, struct dso *dso,
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};
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};
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int cmp;
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int cmp;
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if (sort__has_parent && chain) {
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u64 context = PERF_CONTEXT_MAX;
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int i;
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for (i = 0; i < chain->nr; i++) {
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u64 ip = chain->ips[i];
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struct dso *dso = NULL;
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struct symbol *sym;
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if (ip >= PERF_CONTEXT_MAX) {
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context = ip;
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continue;
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}
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switch (context) {
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case PERF_CONTEXT_HV:
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case PERF_CONTEXT_HV:
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dso = hypervisor_dso;
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dso = hypervisor_dso;
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break;
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break;
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case PERF_CONTEXT_KERNEL:
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if ((sort__has_parent || callchain) && chain)
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dso = kernel_dso;
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syms = resolve_callchain(thread, map, chain, &entry);
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break;
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default:
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break;
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}
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sym = resolve_symbol(thread, NULL, &dso, &ip);
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if (sym && call__match(sym)) {
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entry.parent = sym;
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break;
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}
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}
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}
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while (*p != NULL) {
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while (*p != NULL) {
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parent = *p;
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parent = *p;
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@ -997,8 +1026,10 @@ hist_entry__add(struct thread *thread, struct map *map, struct dso *dso,
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if (!cmp) {
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if (!cmp) {
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he->count += count;
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he->count += count;
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if (callchain)
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if (callchain) {
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append_chain(&he->callchain, chain);
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append_chain(&he->callchain, chain, syms);
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free(syms);
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}
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return 0;
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return 0;
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}
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}
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@ -1014,7 +1045,8 @@ hist_entry__add(struct thread *thread, struct map *map, struct dso *dso,
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*he = entry;
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*he = entry;
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if (callchain) {
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if (callchain) {
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callchain_init(&he->callchain);
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callchain_init(&he->callchain);
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append_chain(&he->callchain, chain);
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append_chain(&he->callchain, chain, syms);
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free(syms);
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}
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}
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rb_link_node(&he->rb_node, parent, p);
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rb_link_node(&he->rb_node, parent, p);
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rb_insert_color(&he->rb_node, &hist);
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rb_insert_color(&he->rb_node, &hist);
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@ -67,7 +67,8 @@ static struct callchain_node *create_child(struct callchain_node *parent)
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}
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}
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static void
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static void
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fill_node(struct callchain_node *node, struct ip_callchain *chain, int start)
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fill_node(struct callchain_node *node, struct ip_callchain *chain, int start,
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struct symbol **syms)
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{
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{
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int i;
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int i;
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@ -80,24 +81,26 @@ fill_node(struct callchain_node *node, struct ip_callchain *chain, int start)
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return;
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return;
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}
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}
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call->ip = chain->ips[i];
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call->ip = chain->ips[i];
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call->sym = syms[i];
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list_add_tail(&call->list, &node->val);
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list_add_tail(&call->list, &node->val);
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}
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}
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node->val_nr = i - start;
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node->val_nr = i - start;
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}
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}
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static void add_child(struct callchain_node *parent, struct ip_callchain *chain)
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static void add_child(struct callchain_node *parent, struct ip_callchain *chain,
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struct symbol **syms)
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{
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{
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struct callchain_node *new;
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struct callchain_node *new;
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new = create_child(parent);
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new = create_child(parent);
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fill_node(new, chain, parent->val_nr);
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fill_node(new, chain, parent->val_nr, syms);
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new->hit = 1;
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new->hit = 1;
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}
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}
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static void
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static void
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split_add_child(struct callchain_node *parent, struct ip_callchain *chain,
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split_add_child(struct callchain_node *parent, struct ip_callchain *chain,
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struct callchain_list *to_split, int idx)
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struct callchain_list *to_split, int idx, struct symbol **syms)
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{
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{
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struct callchain_node *new;
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struct callchain_node *new;
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@ -109,21 +112,22 @@ split_add_child(struct callchain_node *parent, struct ip_callchain *chain,
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parent->val_nr = idx;
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parent->val_nr = idx;
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/* create the new one */
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/* create the new one */
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add_child(parent, chain);
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add_child(parent, chain, syms);
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}
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}
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static int
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static int
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__append_chain(struct callchain_node *root, struct ip_callchain *chain,
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__append_chain(struct callchain_node *root, struct ip_callchain *chain,
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int start);
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int start, struct symbol **syms);
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static int
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static int
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__append_chain_children(struct callchain_node *root, struct ip_callchain *chain)
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__append_chain_children(struct callchain_node *root, struct ip_callchain *chain,
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struct symbol **syms)
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{
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{
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struct callchain_node *rnode;
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struct callchain_node *rnode;
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/* lookup in childrens */
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/* lookup in childrens */
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list_for_each_entry(rnode, &root->children, brothers) {
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list_for_each_entry(rnode, &root->children, brothers) {
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int ret = __append_chain(rnode, chain, root->val_nr);
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int ret = __append_chain(rnode, chain, root->val_nr, syms);
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if (!ret)
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if (!ret)
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return 0;
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return 0;
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}
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}
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@ -132,7 +136,7 @@ __append_chain_children(struct callchain_node *root, struct ip_callchain *chain)
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static int
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static int
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__append_chain(struct callchain_node *root, struct ip_callchain *chain,
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__append_chain(struct callchain_node *root, struct ip_callchain *chain,
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int start)
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int start, struct symbol **syms)
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{
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{
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struct callchain_list *cnode;
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struct callchain_list *cnode;
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int i = start;
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int i = start;
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@ -154,7 +158,7 @@ __append_chain(struct callchain_node *root, struct ip_callchain *chain,
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/* we match only a part of the node. Split it and add the new chain */
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/* we match only a part of the node. Split it and add the new chain */
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if (i < root->val_nr) {
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if (i < root->val_nr) {
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split_add_child(root, chain, cnode, i);
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split_add_child(root, chain, cnode, i, syms);
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return 0;
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return 0;
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}
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}
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return 0;
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return 0;
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}
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}
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return __append_chain_children(root, chain);
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return __append_chain_children(root, chain, syms);
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}
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}
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void append_chain(struct callchain_node *root, struct ip_callchain *chain)
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void append_chain(struct callchain_node *root, struct ip_callchain *chain,
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struct symbol **syms)
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{
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{
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if (__append_chain_children(root, chain) == -1)
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if (__append_chain_children(root, chain, syms) == -1)
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add_child(root, chain);
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add_child(root, chain, syms);
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}
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}
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@ -4,6 +4,7 @@
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#include "../perf.h"
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#include "../perf.h"
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#include "list.h"
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#include "list.h"
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#include "rbtree.h"
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#include "rbtree.h"
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#include "symbol.h"
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struct callchain_node {
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struct callchain_node {
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@ -18,6 +19,7 @@ struct callchain_node {
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struct callchain_list {
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struct callchain_list {
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unsigned long ip;
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unsigned long ip;
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struct symbol *sym;
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struct list_head list;
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struct list_head list;
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};
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};
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@ -28,6 +30,7 @@ static inline void callchain_init(struct callchain_node *node)
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INIT_LIST_HEAD(&node->val);
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INIT_LIST_HEAD(&node->val);
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}
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}
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void append_chain(struct callchain_node *root, struct ip_callchain *chain);
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void append_chain(struct callchain_node *root, struct ip_callchain *chain,
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struct symbol **syms);
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void sort_chain_to_rbtree(struct rb_root *rb_root, struct callchain_node *node);
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void sort_chain_to_rbtree(struct rb_root *rb_root, struct callchain_node *node);
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#endif
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#endif
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