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perf db-export: Add calls parent_id to enable creation of call trees
The call_path can be used to find the parent symbol for a call but not the exact parent call. To do that add parent_id to the call_return export. This enables the creation of a call tree from the exported data. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: https://lkml.kernel.org/n/tip-6j7tzdxo67cox6kan7k22oo6@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -510,18 +510,23 @@ int db_export__call_path(struct db_export *dbe, struct call_path *cp)
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return 0;
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}
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int db_export__call_return(struct db_export *dbe, struct call_return *cr)
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int db_export__call_return(struct db_export *dbe, struct call_return *cr,
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u64 *parent_db_id)
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{
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int err;
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if (cr->db_id)
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return 0;
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err = db_export__call_path(dbe, cr->cp);
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if (err)
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return err;
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cr->db_id = ++dbe->call_return_last_db_id;
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if (!cr->db_id)
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cr->db_id = ++dbe->call_return_last_db_id;
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if (parent_db_id) {
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if (!*parent_db_id)
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*parent_db_id = ++dbe->call_return_last_db_id;
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cr->parent_db_id = *parent_db_id;
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}
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if (dbe->export_call_return)
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return dbe->export_call_return(dbe, cr);
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@ -104,6 +104,7 @@ int db_export__sample(struct db_export *dbe, union perf_event *event,
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int db_export__branch_types(struct db_export *dbe);
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int db_export__call_path(struct db_export *dbe, struct call_path *cp);
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int db_export__call_return(struct db_export *dbe, struct call_return *cr);
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int db_export__call_return(struct db_export *dbe, struct call_return *cr,
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u64 *parent_db_id);
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#endif
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@ -1173,7 +1173,7 @@ static int python_export_call_return(struct db_export *dbe,
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u64 comm_db_id = cr->comm ? cr->comm->db_id : 0;
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PyObject *t;
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t = tuple_new(11);
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t = tuple_new(12);
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tuple_set_u64(t, 0, cr->db_id);
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tuple_set_u64(t, 1, cr->thread->db_id);
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@ -1186,6 +1186,7 @@ static int python_export_call_return(struct db_export *dbe,
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tuple_set_u64(t, 8, cr->return_ref);
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tuple_set_u64(t, 9, cr->cp->parent->db_id);
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tuple_set_s32(t, 10, cr->flags);
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tuple_set_u64(t, 11, cr->parent_db_id);
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call_object(tables->call_return_handler, t, "call_return_table");
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@ -1194,11 +1195,12 @@ static int python_export_call_return(struct db_export *dbe,
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return 0;
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}
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static int python_process_call_return(struct call_return *cr, void *data)
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static int python_process_call_return(struct call_return *cr, u64 *parent_db_id,
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void *data)
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{
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struct db_export *dbe = data;
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return db_export__call_return(dbe, cr);
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return db_export__call_return(dbe, cr, parent_db_id);
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}
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static void python_process_general_event(struct perf_sample *sample,
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@ -49,6 +49,7 @@ enum retpoline_state_t {
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* @timestamp: timestamp (if known)
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* @ref: external reference (e.g. db_id of sample)
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* @branch_count: the branch count when the entry was created
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* @db_id: id used for db-export
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* @cp: call path
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* @no_call: a 'call' was not seen
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* @trace_end: a 'call' but trace ended
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@ -59,6 +60,7 @@ struct thread_stack_entry {
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u64 timestamp;
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u64 ref;
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u64 branch_count;
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u64 db_id;
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struct call_path *cp;
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bool no_call;
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bool trace_end;
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@ -280,12 +282,14 @@ static int thread_stack__call_return(struct thread *thread,
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.comm = ts->comm,
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.db_id = 0,
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};
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u64 *parent_db_id;
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tse = &ts->stack[idx];
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cr.cp = tse->cp;
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cr.call_time = tse->timestamp;
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cr.return_time = timestamp;
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cr.branch_count = ts->branch_count - tse->branch_count;
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cr.db_id = tse->db_id;
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cr.call_ref = tse->ref;
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cr.return_ref = ref;
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if (tse->no_call)
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@ -295,7 +299,14 @@ static int thread_stack__call_return(struct thread *thread,
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if (tse->non_call)
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cr.flags |= CALL_RETURN_NON_CALL;
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return crp->process(&cr, crp->data);
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/*
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* The parent db_id must be assigned before exporting the child. Note
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* it is not possible to export the parent first because its information
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* is not yet complete because its 'return' has not yet been processed.
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*/
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parent_db_id = idx ? &(tse - 1)->db_id : NULL;
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return crp->process(&cr, parent_db_id, crp->data);
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}
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static int __thread_stack__flush(struct thread *thread, struct thread_stack *ts)
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@ -484,7 +495,7 @@ void thread_stack__sample(struct thread *thread, int cpu,
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}
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struct call_return_processor *
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call_return_processor__new(int (*process)(struct call_return *cr, void *data),
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call_return_processor__new(int (*process)(struct call_return *cr, u64 *parent_db_id, void *data),
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void *data)
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{
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struct call_return_processor *crp;
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@ -537,6 +548,7 @@ static int thread_stack__push_cp(struct thread_stack *ts, u64 ret_addr,
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tse->no_call = no_call;
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tse->trace_end = trace_end;
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tse->non_call = false;
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tse->db_id = 0;
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return 0;
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}
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@ -55,6 +55,7 @@ enum {
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* @call_ref: external reference to 'call' sample (e.g. db_id)
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* @return_ref: external reference to 'return' sample (e.g. db_id)
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* @db_id: id used for db-export
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* @parent_db_id: id of parent call used for db-export
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* @flags: Call/Return flags
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*/
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struct call_return {
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@ -67,6 +68,7 @@ struct call_return {
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u64 call_ref;
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u64 return_ref;
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u64 db_id;
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u64 parent_db_id;
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u32 flags;
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};
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@ -79,7 +81,7 @@ struct call_return {
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*/
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struct call_return_processor {
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struct call_path_root *cpr;
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int (*process)(struct call_return *cr, void *data);
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int (*process)(struct call_return *cr, u64 *parent_db_id, void *data);
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void *data;
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};
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@ -93,7 +95,7 @@ void thread_stack__free(struct thread *thread);
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size_t thread_stack__depth(struct thread *thread, int cpu);
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struct call_return_processor *
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call_return_processor__new(int (*process)(struct call_return *cr, void *data),
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call_return_processor__new(int (*process)(struct call_return *cr, u64 *parent_db_id, void *data),
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void *data);
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void call_return_processor__free(struct call_return_processor *crp);
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int thread_stack__process(struct thread *thread, struct comm *comm,
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