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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committed by
Ingo Molnar
parent
9198aa77b6
commit
4424961ad6
@ -67,7 +67,8 @@ static struct callchain_node *create_child(struct callchain_node *parent)
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}
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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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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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}
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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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}
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node->val_nr = i - start;
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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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struct callchain_node *new;
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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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}
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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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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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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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/* 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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static int
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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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__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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struct callchain_node *rnode;
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/* lookup in childrens */
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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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return 0;
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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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__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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struct callchain_list *cnode;
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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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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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}
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@ -164,11 +168,12 @@ __append_chain(struct callchain_node *root, struct ip_callchain *chain,
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return 0;
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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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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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if (__append_chain_children(root, chain) == -1)
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add_child(root, chain);
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if (__append_chain_children(root, chain, syms) == -1)
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add_child(root, chain, syms);
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}
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