diff options
Diffstat (limited to 'tools/perf/util/machine.c')
| -rw-r--r-- | tools/perf/util/machine.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index 90703b7ca6de..b5c2d8be4144 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -598,6 +598,24 @@ struct thread *machine__find_thread(struct machine *machine, pid_t pid, return th; } +/* + * Threads are identified by pid and tid, and the idle task has pid == tid == 0. + * So here a single thread is created for that, but actually there is a separate + * idle task per cpu, so there should be one 'struct thread' per cpu, but there + * is only 1. That causes problems for some tools, requiring workarounds. For + * example get_idle_thread() in builtin-sched.c, or thread_stack__per_cpu(). + */ +struct thread *machine__idle_thread(struct machine *machine) +{ + struct thread *thread = machine__findnew_thread(machine, 0, 0); + + if (!thread || thread__set_comm(thread, "swapper", 0) || + thread__set_namespaces(thread, 0, NULL)) + pr_err("problem inserting idle task for machine pid %d\n", machine->pid); + + return thread; +} + struct comm *machine__thread_exec_comm(struct machine *machine, struct thread *thread) { |