diff options
Diffstat (limited to 'tools/perf/util/thread.c')
| -rw-r--r-- | tools/perf/util/thread.c | 140 |
1 files changed, 134 insertions, 6 deletions
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c index 0ffdd52d86d7..22be77225bb0 100644 --- a/tools/perf/util/thread.c +++ b/tools/perf/util/thread.c @@ -1,5 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 +#include <elf.h> #include <errno.h> +#include <fcntl.h> #include <stdlib.h> #include <stdio.h> #include <string.h> @@ -16,6 +18,7 @@ #include "symbol.h" #include "unwind.h" #include "callchain.h" +#include "dwarf-regs.h" #include <api/fs/fs.h> @@ -38,6 +41,7 @@ int thread__init_maps(struct thread *thread, struct machine *machine) } struct thread *thread__new(pid_t pid, pid_t tid) + NO_THREAD_SAFETY_ANALYSIS /* Allocation/creation is inherently single threaded. */ { RC_STRUCT(thread) *_thread = zalloc(sizeof(*_thread)); struct thread *thread; @@ -51,6 +55,7 @@ struct thread *thread__new(pid_t pid, pid_t tid) thread__set_ppid(thread, -1); thread__set_cpu(thread, -1); thread__set_guest_cpu(thread, -1); + thread__set_e_machine(thread, EM_NONE); thread__set_lbr_stitch_enable(thread, false); INIT_LIST_HEAD(thread__namespaces_list(thread)); INIT_LIST_HEAD(thread__comm_list(thread)); @@ -196,7 +201,8 @@ int thread__set_namespaces(struct thread *thread, u64 timestamp, return ret; } -struct comm *thread__comm(struct thread *thread) +static struct comm *__thread__comm(struct thread *thread) + SHARED_LOCKS_REQUIRED(thread__comm_lock(thread)) { if (list_empty(thread__comm_list(thread))) return NULL; @@ -204,16 +210,30 @@ struct comm *thread__comm(struct thread *thread) return list_first_entry(thread__comm_list(thread), struct comm, list); } +struct comm *thread__comm(struct thread *thread) +{ + struct comm *res = NULL; + + down_read(thread__comm_lock(thread)); + res = __thread__comm(thread); + up_read(thread__comm_lock(thread)); + return res; +} + struct comm *thread__exec_comm(struct thread *thread) { struct comm *comm, *last = NULL, *second_last = NULL; + down_read(thread__comm_lock(thread)); list_for_each_entry(comm, thread__comm_list(thread), list) { - if (comm->exec) + if (comm->exec) { + up_read(thread__comm_lock(thread)); return comm; + } second_last = last; last = comm; } + up_read(thread__comm_lock(thread)); /* * 'last' with no start time might be the parent's comm of a synthesized @@ -229,8 +249,9 @@ struct comm *thread__exec_comm(struct thread *thread) static int ____thread__set_comm(struct thread *thread, const char *str, u64 timestamp, bool exec) + EXCLUSIVE_LOCKS_REQUIRED(thread__comm_lock(thread)) { - struct comm *new, *curr = thread__comm(thread); + struct comm *new, *curr = __thread__comm(thread); /* Override the default :tid entry */ if (!thread__comm_set(thread)) { @@ -281,8 +302,9 @@ int thread__set_comm_from_proc(struct thread *thread) } static const char *__thread__comm_str(struct thread *thread) + SHARED_LOCKS_REQUIRED(thread__comm_lock(thread)) { - const struct comm *comm = thread__comm(thread); + const struct comm *comm = __thread__comm(thread); if (!comm) return NULL; @@ -406,7 +428,7 @@ int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp, bo } void thread__find_cpumode_addr_location(struct thread *thread, u64 addr, - struct addr_location *al) + bool symbols, struct addr_location *al) { size_t i; const u8 cpumodes[] = { @@ -417,12 +439,118 @@ void thread__find_cpumode_addr_location(struct thread *thread, u64 addr, }; for (i = 0; i < ARRAY_SIZE(cpumodes); i++) { - thread__find_symbol(thread, cpumodes[i], addr, al); + if (symbols) + thread__find_symbol(thread, cpumodes[i], addr, al); + else + thread__find_map(thread, cpumodes[i], addr, al); + if (al->map) break; } } +static uint16_t read_proc_e_machine_for_pid(pid_t pid, uint32_t *e_flags) +{ + char path[6 /* "/proc/" */ + 11 /* max length of pid */ + 5 /* "/exe\0" */]; + int fd; + uint16_t e_machine = EM_NONE; + + snprintf(path, sizeof(path), "/proc/%d/exe", pid); + fd = open(path, O_RDONLY); + if (fd >= 0) { + e_machine = dso__read_e_machine(/*optional_dso=*/NULL, fd, e_flags); + close(fd); + } + return e_machine; +} + +struct thread__e_machine_callback_args { + struct machine *machine; + uint32_t e_flags; + uint16_t e_machine; +}; + +static int thread__e_machine_callback(struct map *map, void *_args) +{ + struct thread__e_machine_callback_args *args = _args; + struct dso *dso = map__dso(map); + + if (!dso) + return 0; // No dso, continue search. + + args->e_machine = dso__e_machine(dso, args->machine, &args->e_flags); + return args->e_machine != EM_NONE ? 1 /* stop search */ : 0 /* continue search */; +} + +uint16_t thread__e_machine(struct thread *thread, struct machine *machine, uint32_t *e_flags) +{ + pid_t tid, pid; + uint16_t e_machine = RC_CHK_ACCESS(thread)->e_machine; + uint32_t local_e_flags = 0; + struct thread__e_machine_callback_args args = { + .machine = machine, + .e_flags = 0, + .e_machine = EM_NONE, + }; + + if (e_machine != EM_NONE) { + if (e_flags) + *e_flags = thread__e_flags(thread); + return e_machine; + } + + if (machine == NULL) { + struct maps *maps = thread__maps(thread); + + machine = maps__machine(maps); + } + tid = thread__tid(thread); + pid = thread__pid(thread); + if (pid != tid) { + struct thread *parent = machine__findnew_thread(machine, pid, pid); + + if (parent) { + e_machine = thread__e_machine(parent, machine, &local_e_flags); + thread__put(parent); + goto out; + } + /* Something went wrong, fallback. */ + } + /* Reading on the PID thread. First try to find from the maps. */ + maps__for_each_map(thread__maps(thread), thread__e_machine_callback, &args); + + if (args.e_machine != EM_NONE) { + e_machine = args.e_machine; + local_e_flags = args.e_flags; + } else { + /* Maps failed, perhaps we're live with map events disabled. */ + bool is_live = machine->machines == NULL; + + if (!is_live) { + /* Check if the session has a data file. */ + struct perf_session *session = container_of(machine->machines, + struct perf_session, + machines); + + is_live = !!session->data; + } + /* Read from /proc/pid/exe if live. */ + if (is_live) + e_machine = read_proc_e_machine_for_pid(pid, &local_e_flags); + } +out: + if (e_machine != EM_NONE) { + thread__set_e_machine(thread, e_machine); + thread__set_e_flags(thread, local_e_flags); + } else { + e_machine = EM_HOST; + local_e_flags = EF_HOST; + } + if (e_flags) + *e_flags = local_e_flags; + return e_machine; +} + struct thread *thread__main_thread(struct machine *machine, struct thread *thread) { if (thread__pid(thread) == thread__tid(thread)) |