| From | Adrian Hunter <> | Subject | [PATCH 16/52] perf tools: Add ability to record the current tid for each cpu | Date | Tue, 22 Jul 2014 16:17:25 +0300 |
| |
Add an array to struct machine to store the current tid running on each cpu. Add machine functions to get / set the tid for a cpu.
This will be used to determine the tid when decoding a per-cpu Instruction Trace.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> --- tools/perf/util/machine.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ tools/perf/util/machine.h | 5 +++++ 2 files changed, 51 insertions(+)
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index 04c17a7..34dd63f 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -47,6 +47,8 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid) thread__set_comm(thread, comm, 0); } + machine->current_tid = NULL; + return 0; } @@ -106,6 +108,7 @@ void machine__exit(struct machine *machine) dsos__delete(&machine->user_dsos); dsos__delete(&machine->kernel_dsos); zfree(&machine->root_dir); + zfree(&machine->current_tid); } void machine__delete(struct machine *machine) @@ -1532,3 +1535,46 @@ int machine__get_kernel_start(struct machine *machine) } return err; } + +pid_t machine__get_current_tid(struct machine *machine, int cpu) +{ + if (cpu < 0 || cpu >= MAX_NR_CPUS || !machine->current_tid) + return -1; + + return machine->current_tid[cpu]; +} + +int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid, + pid_t tid) +{ + struct thread *thread; + + if (cpu < 0) + return -EINVAL; + + if (!machine->current_tid) { + int i; + + machine->current_tid = calloc(MAX_NR_CPUS, sizeof(pid_t)); + if (!machine->current_tid) + return -ENOMEM; + for (i = 0; i < MAX_NR_CPUS; i++) + machine->current_tid[i] = -1; + } + + if (cpu >= MAX_NR_CPUS) { + pr_err("Requested CPU %d too large. ", cpu); + pr_err("Consider raising MAX_NR_CPUS\n"); + return -EINVAL; + } + + machine->current_tid[cpu] = tid; + + thread = machine__findnew_thread(machine, pid, tid); + if (!thread) + return -ENOMEM; + + thread->cpu = cpu; + + return 0; +} diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h index be97021..6442d65 100644 --- a/tools/perf/util/machine.h +++ b/tools/perf/util/machine.h @@ -35,6 +35,7 @@ struct machine { struct map *vmlinux_maps[MAP__NR_TYPES]; u64 kernel_start; symbol_filter_t symbol_filter; + pid_t *current_tid; }; static inline @@ -212,4 +213,8 @@ int machine__synthesize_threads(struct machine *machine, struct target *target, perf_event__process, data_mmap); } +pid_t machine__get_current_tid(struct machine *machine, int cpu); +int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid, + pid_t tid); + #endif /* __PERF_MACHINE_H */ -- 1.8.3.2
|