Commit f435887e authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo

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: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lkml.kernel.org/n/tip-6j7tzdxo67cox6kan7k22oo6@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 07633387
......@@ -510,19 +510,24 @@ int db_export__call_path(struct db_export *dbe, struct call_path *cp)
return 0;
}
int db_export__call_return(struct db_export *dbe, struct call_return *cr)
int db_export__call_return(struct db_export *dbe, struct call_return *cr,
u64 *parent_db_id)
{
int err;
if (cr->db_id)
return 0;
err = db_export__call_path(dbe, cr->cp);
if (err)
return err;
if (!cr->db_id)
cr->db_id = ++dbe->call_return_last_db_id;
if (parent_db_id) {
if (!*parent_db_id)
*parent_db_id = ++dbe->call_return_last_db_id;
cr->parent_db_id = *parent_db_id;
}
if (dbe->export_call_return)
return dbe->export_call_return(dbe, cr);
......
......@@ -104,6 +104,7 @@ int db_export__sample(struct db_export *dbe, union perf_event *event,
int db_export__branch_types(struct db_export *dbe);
int db_export__call_path(struct db_export *dbe, struct call_path *cp);
int db_export__call_return(struct db_export *dbe, struct call_return *cr);
int db_export__call_return(struct db_export *dbe, struct call_return *cr,
u64 *parent_db_id);
#endif
......@@ -1173,7 +1173,7 @@ static int python_export_call_return(struct db_export *dbe,
u64 comm_db_id = cr->comm ? cr->comm->db_id : 0;
PyObject *t;
t = tuple_new(11);
t = tuple_new(12);
tuple_set_u64(t, 0, cr->db_id);
tuple_set_u64(t, 1, cr->thread->db_id);
......@@ -1186,6 +1186,7 @@ static int python_export_call_return(struct db_export *dbe,
tuple_set_u64(t, 8, cr->return_ref);
tuple_set_u64(t, 9, cr->cp->parent->db_id);
tuple_set_s32(t, 10, cr->flags);
tuple_set_u64(t, 11, cr->parent_db_id);
call_object(tables->call_return_handler, t, "call_return_table");
......@@ -1194,11 +1195,12 @@ static int python_export_call_return(struct db_export *dbe,
return 0;
}
static int python_process_call_return(struct call_return *cr, void *data)
static int python_process_call_return(struct call_return *cr, u64 *parent_db_id,
void *data)
{
struct db_export *dbe = data;
return db_export__call_return(dbe, cr);
return db_export__call_return(dbe, cr, parent_db_id);
}
static void python_process_general_event(struct perf_sample *sample,
......
......@@ -49,6 +49,7 @@ enum retpoline_state_t {
* @timestamp: timestamp (if known)
* @ref: external reference (e.g. db_id of sample)
* @branch_count: the branch count when the entry was created
* @db_id: id used for db-export
* @cp: call path
* @no_call: a 'call' was not seen
* @trace_end: a 'call' but trace ended
......@@ -59,6 +60,7 @@ struct thread_stack_entry {
u64 timestamp;
u64 ref;
u64 branch_count;
u64 db_id;
struct call_path *cp;
bool no_call;
bool trace_end;
......@@ -280,12 +282,14 @@ static int thread_stack__call_return(struct thread *thread,
.comm = ts->comm,
.db_id = 0,
};
u64 *parent_db_id;
tse = &ts->stack[idx];
cr.cp = tse->cp;
cr.call_time = tse->timestamp;
cr.return_time = timestamp;
cr.branch_count = ts->branch_count - tse->branch_count;
cr.db_id = tse->db_id;
cr.call_ref = tse->ref;
cr.return_ref = ref;
if (tse->no_call)
......@@ -295,7 +299,14 @@ static int thread_stack__call_return(struct thread *thread,
if (tse->non_call)
cr.flags |= CALL_RETURN_NON_CALL;
return crp->process(&cr, crp->data);
/*
* The parent db_id must be assigned before exporting the child. Note
* it is not possible to export the parent first because its information
* is not yet complete because its 'return' has not yet been processed.
*/
parent_db_id = idx ? &(tse - 1)->db_id : NULL;
return crp->process(&cr, parent_db_id, crp->data);
}
static int __thread_stack__flush(struct thread *thread, struct thread_stack *ts)
......@@ -484,7 +495,7 @@ void thread_stack__sample(struct thread *thread, int cpu,
}
struct call_return_processor *
call_return_processor__new(int (*process)(struct call_return *cr, void *data),
call_return_processor__new(int (*process)(struct call_return *cr, u64 *parent_db_id, void *data),
void *data)
{
struct call_return_processor *crp;
......@@ -537,6 +548,7 @@ static int thread_stack__push_cp(struct thread_stack *ts, u64 ret_addr,
tse->no_call = no_call;
tse->trace_end = trace_end;
tse->non_call = false;
tse->db_id = 0;
return 0;
}
......
......@@ -55,6 +55,7 @@ enum {
* @call_ref: external reference to 'call' sample (e.g. db_id)
* @return_ref: external reference to 'return' sample (e.g. db_id)
* @db_id: id used for db-export
* @parent_db_id: id of parent call used for db-export
* @flags: Call/Return flags
*/
struct call_return {
......@@ -67,6 +68,7 @@ struct call_return {
u64 call_ref;
u64 return_ref;
u64 db_id;
u64 parent_db_id;
u32 flags;
};
......@@ -79,7 +81,7 @@ struct call_return {
*/
struct call_return_processor {
struct call_path_root *cpr;
int (*process)(struct call_return *cr, void *data);
int (*process)(struct call_return *cr, u64 *parent_db_id, void *data);
void *data;
};
......@@ -93,7 +95,7 @@ void thread_stack__free(struct thread *thread);
size_t thread_stack__depth(struct thread *thread, int cpu);
struct call_return_processor *
call_return_processor__new(int (*process)(struct call_return *cr, void *data),
call_return_processor__new(int (*process)(struct call_return *cr, u64 *parent_db_id, void *data),
void *data);
void call_return_processor__free(struct call_return_processor *crp);
int thread_stack__process(struct thread *thread, struct comm *comm,
......
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