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![Adrian Hunter](/assets/img/avatar_default.png)
Export details of switch events including the threads and their current comms. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: http://lkml.kernel.org/r/20190710085810.1650-20-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
610 lines
14 KiB
C
610 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* db-export.c: Support for exporting data suitable for import to a database
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* Copyright (c) 2014, Intel Corporation.
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include "evsel.h"
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#include "machine.h"
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#include "thread.h"
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#include "comm.h"
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#include "symbol.h"
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#include "map.h"
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#include "event.h"
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#include "thread-stack.h"
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#include "callchain.h"
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#include "call-path.h"
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#include "db-export.h"
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#include <linux/zalloc.h>
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int db_export__init(struct db_export *dbe)
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{
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memset(dbe, 0, sizeof(struct db_export));
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return 0;
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}
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void db_export__exit(struct db_export *dbe)
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{
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call_return_processor__free(dbe->crp);
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dbe->crp = NULL;
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}
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int db_export__evsel(struct db_export *dbe, struct perf_evsel *evsel)
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{
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if (evsel->db_id)
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return 0;
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evsel->db_id = ++dbe->evsel_last_db_id;
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if (dbe->export_evsel)
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return dbe->export_evsel(dbe, evsel);
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return 0;
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}
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int db_export__machine(struct db_export *dbe, struct machine *machine)
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{
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if (machine->db_id)
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return 0;
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machine->db_id = ++dbe->machine_last_db_id;
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if (dbe->export_machine)
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return dbe->export_machine(dbe, machine);
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return 0;
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}
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int db_export__thread(struct db_export *dbe, struct thread *thread,
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struct machine *machine, struct thread *main_thread)
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{
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u64 main_thread_db_id = 0;
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if (thread->db_id)
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return 0;
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thread->db_id = ++dbe->thread_last_db_id;
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if (main_thread)
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main_thread_db_id = main_thread->db_id;
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if (dbe->export_thread)
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return dbe->export_thread(dbe, thread, main_thread_db_id,
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machine);
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return 0;
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}
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static int __db_export__comm(struct db_export *dbe, struct comm *comm,
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struct thread *thread)
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{
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comm->db_id = ++dbe->comm_last_db_id;
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if (dbe->export_comm)
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return dbe->export_comm(dbe, comm, thread);
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return 0;
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}
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int db_export__comm(struct db_export *dbe, struct comm *comm,
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struct thread *thread)
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{
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if (comm->db_id)
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return 0;
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return __db_export__comm(dbe, comm, thread);
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}
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/*
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* Export the "exec" comm. The "exec" comm is the program / application command
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* name at the time it first executes. It is used to group threads for the same
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* program. Note that the main thread pid (or thread group id tgid) cannot be
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* used because it does not change when a new program is exec'ed.
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*/
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int db_export__exec_comm(struct db_export *dbe, struct comm *comm,
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struct thread *main_thread)
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{
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int err;
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if (comm->db_id)
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return 0;
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err = __db_export__comm(dbe, comm, main_thread);
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if (err)
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return err;
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/*
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* Record the main thread for this comm. Note that the main thread can
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* have many "exec" comms because there will be a new one every time it
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* exec's. An "exec" comm however will only ever have 1 main thread.
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* That is different to any other threads for that same program because
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* exec() will effectively kill them, so the relationship between the
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* "exec" comm and non-main threads is 1-to-1. That is why
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* db_export__comm_thread() is called here for the main thread, but it
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* is called for non-main threads when they are exported.
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*/
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return db_export__comm_thread(dbe, comm, main_thread);
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}
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int db_export__comm_thread(struct db_export *dbe, struct comm *comm,
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struct thread *thread)
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{
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u64 db_id;
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db_id = ++dbe->comm_thread_last_db_id;
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if (dbe->export_comm_thread)
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return dbe->export_comm_thread(dbe, db_id, comm, thread);
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return 0;
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}
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int db_export__dso(struct db_export *dbe, struct dso *dso,
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struct machine *machine)
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{
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if (dso->db_id)
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return 0;
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dso->db_id = ++dbe->dso_last_db_id;
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if (dbe->export_dso)
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return dbe->export_dso(dbe, dso, machine);
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return 0;
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}
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int db_export__symbol(struct db_export *dbe, struct symbol *sym,
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struct dso *dso)
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{
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u64 *sym_db_id = symbol__priv(sym);
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if (*sym_db_id)
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return 0;
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*sym_db_id = ++dbe->symbol_last_db_id;
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if (dbe->export_symbol)
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return dbe->export_symbol(dbe, sym, dso);
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return 0;
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}
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static int db_ids_from_al(struct db_export *dbe, struct addr_location *al,
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u64 *dso_db_id, u64 *sym_db_id, u64 *offset)
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{
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int err;
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if (al->map) {
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struct dso *dso = al->map->dso;
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err = db_export__dso(dbe, dso, al->machine);
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if (err)
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return err;
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*dso_db_id = dso->db_id;
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if (!al->sym) {
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al->sym = symbol__new(al->addr, 0, 0, 0, "unknown");
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if (al->sym)
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dso__insert_symbol(dso, al->sym);
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}
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if (al->sym) {
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u64 *db_id = symbol__priv(al->sym);
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err = db_export__symbol(dbe, al->sym, dso);
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if (err)
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return err;
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*sym_db_id = *db_id;
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*offset = al->addr - al->sym->start;
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}
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}
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return 0;
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}
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static struct call_path *call_path_from_sample(struct db_export *dbe,
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struct machine *machine,
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struct thread *thread,
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struct perf_sample *sample,
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struct perf_evsel *evsel)
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{
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u64 kernel_start = machine__kernel_start(machine);
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struct call_path *current = &dbe->cpr->call_path;
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enum chain_order saved_order = callchain_param.order;
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int err;
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if (!symbol_conf.use_callchain || !sample->callchain)
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return NULL;
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/*
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* Since the call path tree must be built starting with the root, we
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* must use ORDER_CALL for call chain resolution, in order to process
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* the callchain starting with the root node and ending with the leaf.
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*/
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callchain_param.order = ORDER_CALLER;
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err = thread__resolve_callchain(thread, &callchain_cursor, evsel,
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sample, NULL, NULL, PERF_MAX_STACK_DEPTH);
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if (err) {
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callchain_param.order = saved_order;
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return NULL;
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}
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callchain_cursor_commit(&callchain_cursor);
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while (1) {
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struct callchain_cursor_node *node;
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struct addr_location al;
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u64 dso_db_id = 0, sym_db_id = 0, offset = 0;
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memset(&al, 0, sizeof(al));
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node = callchain_cursor_current(&callchain_cursor);
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if (!node)
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break;
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/*
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* Handle export of symbol and dso for this node by
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* constructing an addr_location struct and then passing it to
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* db_ids_from_al() to perform the export.
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*/
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al.sym = node->sym;
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al.map = node->map;
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al.machine = machine;
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al.addr = node->ip;
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if (al.map && !al.sym)
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al.sym = dso__find_symbol(al.map->dso, al.addr);
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db_ids_from_al(dbe, &al, &dso_db_id, &sym_db_id, &offset);
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/* add node to the call path tree if it doesn't exist */
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current = call_path__findnew(dbe->cpr, current,
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al.sym, node->ip,
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kernel_start);
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callchain_cursor_advance(&callchain_cursor);
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}
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/* Reset the callchain order to its prior value. */
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callchain_param.order = saved_order;
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if (current == &dbe->cpr->call_path) {
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/* Bail because the callchain was empty. */
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return NULL;
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}
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return current;
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}
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int db_export__branch_type(struct db_export *dbe, u32 branch_type,
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const char *name)
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{
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if (dbe->export_branch_type)
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return dbe->export_branch_type(dbe, branch_type, name);
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return 0;
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}
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static int db_export__threads(struct db_export *dbe, struct thread *thread,
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struct thread *main_thread,
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struct machine *machine, struct comm **comm_ptr)
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{
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struct comm *comm = NULL;
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struct comm *curr_comm;
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int err;
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if (main_thread) {
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/*
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* A thread has a reference to the main thread, so export the
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* main thread first.
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*/
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err = db_export__thread(dbe, main_thread, machine, main_thread);
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if (err)
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return err;
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/*
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* Export comm before exporting the non-main thread because
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* db_export__comm_thread() can be called further below.
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*/
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comm = machine__thread_exec_comm(machine, main_thread);
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if (comm) {
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err = db_export__exec_comm(dbe, comm, main_thread);
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if (err)
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return err;
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*comm_ptr = comm;
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}
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}
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if (thread != main_thread) {
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/*
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* For a non-main thread, db_export__comm_thread() must be
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* called only if thread has not previously been exported.
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*/
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bool export_comm_thread = comm && !thread->db_id;
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err = db_export__thread(dbe, thread, machine, main_thread);
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if (err)
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return err;
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if (export_comm_thread) {
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err = db_export__comm_thread(dbe, comm, thread);
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if (err)
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return err;
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}
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}
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curr_comm = thread__comm(thread);
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if (curr_comm)
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return db_export__comm(dbe, curr_comm, thread);
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return 0;
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}
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int db_export__sample(struct db_export *dbe, union perf_event *event,
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struct perf_sample *sample, struct perf_evsel *evsel,
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struct addr_location *al)
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{
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struct thread *thread = al->thread;
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struct export_sample es = {
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.event = event,
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.sample = sample,
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.evsel = evsel,
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.al = al,
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};
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struct thread *main_thread;
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struct comm *comm = NULL;
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int err;
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err = db_export__evsel(dbe, evsel);
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if (err)
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return err;
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err = db_export__machine(dbe, al->machine);
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if (err)
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return err;
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main_thread = thread__main_thread(al->machine, thread);
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err = db_export__threads(dbe, thread, main_thread, al->machine, &comm);
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if (err)
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goto out_put;
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if (comm)
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es.comm_db_id = comm->db_id;
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es.db_id = ++dbe->sample_last_db_id;
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err = db_ids_from_al(dbe, al, &es.dso_db_id, &es.sym_db_id, &es.offset);
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if (err)
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goto out_put;
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if (dbe->cpr) {
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struct call_path *cp = call_path_from_sample(dbe, al->machine,
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thread, sample,
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evsel);
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if (cp) {
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db_export__call_path(dbe, cp);
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es.call_path_id = cp->db_id;
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}
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}
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if ((evsel->attr.sample_type & PERF_SAMPLE_ADDR) &&
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sample_addr_correlates_sym(&evsel->attr)) {
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struct addr_location addr_al;
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thread__resolve(thread, &addr_al, sample);
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err = db_ids_from_al(dbe, &addr_al, &es.addr_dso_db_id,
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&es.addr_sym_db_id, &es.addr_offset);
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if (err)
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goto out_put;
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if (dbe->crp) {
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err = thread_stack__process(thread, comm, sample, al,
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&addr_al, es.db_id,
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dbe->crp);
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if (err)
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goto out_put;
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}
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}
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if (dbe->export_sample)
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err = dbe->export_sample(dbe, &es);
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out_put:
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thread__put(main_thread);
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return err;
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}
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static struct {
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u32 branch_type;
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const char *name;
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} branch_types[] = {
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{0, "no branch"},
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{PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL, "call"},
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{PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN, "return"},
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{PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CONDITIONAL, "conditional jump"},
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{PERF_IP_FLAG_BRANCH, "unconditional jump"},
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{PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL | PERF_IP_FLAG_INTERRUPT,
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"software interrupt"},
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{PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN | PERF_IP_FLAG_INTERRUPT,
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"return from interrupt"},
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{PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL | PERF_IP_FLAG_SYSCALLRET,
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"system call"},
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{PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN | PERF_IP_FLAG_SYSCALLRET,
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"return from system call"},
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{PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_ASYNC, "asynchronous branch"},
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{PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC |
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PERF_IP_FLAG_INTERRUPT, "hardware interrupt"},
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{PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_TX_ABORT, "transaction abort"},
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{PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_TRACE_BEGIN, "trace begin"},
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{PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_TRACE_END, "trace end"},
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{0, NULL}
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};
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int db_export__branch_types(struct db_export *dbe)
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{
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int i, err = 0;
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for (i = 0; branch_types[i].name ; i++) {
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err = db_export__branch_type(dbe, branch_types[i].branch_type,
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branch_types[i].name);
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if (err)
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break;
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}
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/* Add trace begin / end variants */
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for (i = 0; branch_types[i].name ; i++) {
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const char *name = branch_types[i].name;
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u32 type = branch_types[i].branch_type;
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char buf[64];
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if (type == PERF_IP_FLAG_BRANCH ||
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(type & (PERF_IP_FLAG_TRACE_BEGIN | PERF_IP_FLAG_TRACE_END)))
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continue;
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snprintf(buf, sizeof(buf), "trace begin / %s", name);
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err = db_export__branch_type(dbe, type | PERF_IP_FLAG_TRACE_BEGIN, buf);
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if (err)
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break;
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snprintf(buf, sizeof(buf), "%s / trace end", name);
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err = db_export__branch_type(dbe, type | PERF_IP_FLAG_TRACE_END, buf);
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if (err)
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break;
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}
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return err;
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}
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int db_export__call_path(struct db_export *dbe, struct call_path *cp)
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{
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int err;
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if (cp->db_id)
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return 0;
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if (cp->parent) {
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err = db_export__call_path(dbe, cp->parent);
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if (err)
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return err;
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}
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cp->db_id = ++dbe->call_path_last_db_id;
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if (dbe->export_call_path)
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return dbe->export_call_path(dbe, 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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u64 *parent_db_id)
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{
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int err;
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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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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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return 0;
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}
|
|
|
|
static int db_export__pid_tid(struct db_export *dbe, struct machine *machine,
|
|
pid_t pid, pid_t tid, u64 *db_id,
|
|
struct comm **comm_ptr, bool *is_idle)
|
|
{
|
|
struct thread *thread = machine__find_thread(machine, pid, tid);
|
|
struct thread *main_thread;
|
|
int err = 0;
|
|
|
|
if (!thread || !thread->comm_set)
|
|
goto out_put;
|
|
|
|
*is_idle = !thread->pid_ && !thread->tid;
|
|
|
|
main_thread = thread__main_thread(machine, thread);
|
|
|
|
err = db_export__threads(dbe, thread, main_thread, machine, comm_ptr);
|
|
|
|
*db_id = thread->db_id;
|
|
|
|
thread__put(main_thread);
|
|
out_put:
|
|
thread__put(thread);
|
|
|
|
return err;
|
|
}
|
|
|
|
int db_export__switch(struct db_export *dbe, union perf_event *event,
|
|
struct perf_sample *sample, struct machine *machine)
|
|
{
|
|
bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
|
|
bool out_preempt = out &&
|
|
(event->header.misc & PERF_RECORD_MISC_SWITCH_OUT_PREEMPT);
|
|
int flags = out | (out_preempt << 1);
|
|
bool is_idle_a = false, is_idle_b = false;
|
|
u64 th_a_id = 0, th_b_id = 0;
|
|
u64 comm_out_id, comm_in_id;
|
|
struct comm *comm_a = NULL;
|
|
struct comm *comm_b = NULL;
|
|
u64 th_out_id, th_in_id;
|
|
u64 db_id;
|
|
int err;
|
|
|
|
err = db_export__machine(dbe, machine);
|
|
if (err)
|
|
return err;
|
|
|
|
err = db_export__pid_tid(dbe, machine, sample->pid, sample->tid,
|
|
&th_a_id, &comm_a, &is_idle_a);
|
|
if (err)
|
|
return err;
|
|
|
|
if (event->header.type == PERF_RECORD_SWITCH_CPU_WIDE) {
|
|
pid_t pid = event->context_switch.next_prev_pid;
|
|
pid_t tid = event->context_switch.next_prev_tid;
|
|
|
|
err = db_export__pid_tid(dbe, machine, pid, tid, &th_b_id,
|
|
&comm_b, &is_idle_b);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Do not export if both threads are unknown (i.e. not being traced),
|
|
* or one is unknown and the other is the idle task.
|
|
*/
|
|
if ((!th_a_id || is_idle_a) && (!th_b_id || is_idle_b))
|
|
return 0;
|
|
|
|
db_id = ++dbe->context_switch_last_db_id;
|
|
|
|
if (out) {
|
|
th_out_id = th_a_id;
|
|
th_in_id = th_b_id;
|
|
comm_out_id = comm_a ? comm_a->db_id : 0;
|
|
comm_in_id = comm_b ? comm_b->db_id : 0;
|
|
} else {
|
|
th_out_id = th_b_id;
|
|
th_in_id = th_a_id;
|
|
comm_out_id = comm_b ? comm_b->db_id : 0;
|
|
comm_in_id = comm_a ? comm_a->db_id : 0;
|
|
}
|
|
|
|
if (dbe->export_context_switch)
|
|
return dbe->export_context_switch(dbe, db_id, machine, sample,
|
|
th_out_id, comm_out_id,
|
|
th_in_id, comm_in_id, flags);
|
|
return 0;
|
|
}
|