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oprofile/nmi timer: Convert to hotplug state machine
Install the callbacks via the state machine and let the core invoke the callbacks on the already online CPUs. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: oprofile-list@lists.sf.net Cc: Robert Richter <rric@kernel.org> Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20161126231350.10321-6-bigeasy@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -59,25 +59,16 @@ static void nmi_timer_stop_cpu(int cpu)
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perf_event_disable(event);
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}
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static int nmi_timer_cpu_notifier(struct notifier_block *b, unsigned long action,
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void *data)
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static int nmi_timer_cpu_online(unsigned int cpu)
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{
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int cpu = (unsigned long)data;
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switch (action) {
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case CPU_DOWN_FAILED:
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case CPU_ONLINE:
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nmi_timer_start_cpu(cpu);
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break;
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case CPU_DOWN_PREPARE:
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return 0;
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}
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static int nmi_timer_cpu_predown(unsigned int cpu)
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{
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nmi_timer_stop_cpu(cpu);
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break;
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return 0;
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block nmi_timer_cpu_nb = {
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.notifier_call = nmi_timer_cpu_notifier
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};
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static int nmi_timer_start(void)
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{
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@ -103,13 +94,14 @@ static void nmi_timer_stop(void)
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put_online_cpus();
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}
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static enum cpuhp_state hp_online;
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static void nmi_timer_shutdown(void)
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{
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struct perf_event *event;
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int cpu;
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cpu_notifier_register_begin();
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__unregister_cpu_notifier(&nmi_timer_cpu_nb);
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cpuhp_remove_state(hp_online);
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for_each_possible_cpu(cpu) {
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event = per_cpu(nmi_timer_events, cpu);
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if (!event)
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@ -118,13 +110,11 @@ static void nmi_timer_shutdown(void)
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per_cpu(nmi_timer_events, cpu) = NULL;
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perf_event_release_kernel(event);
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}
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cpu_notifier_register_done();
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}
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static int nmi_timer_setup(void)
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{
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int cpu, err;
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int err;
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u64 period;
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/* clock cycles per tick: */
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@ -132,24 +122,14 @@ static int nmi_timer_setup(void)
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do_div(period, HZ);
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nmi_timer_attr.sample_period = period;
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cpu_notifier_register_begin();
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err = __register_cpu_notifier(&nmi_timer_cpu_nb);
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if (err)
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goto out;
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/* can't attach events to offline cpus: */
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for_each_online_cpu(cpu) {
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err = nmi_timer_start_cpu(cpu);
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if (err) {
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cpu_notifier_register_done();
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err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "oprofile/nmi:online",
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nmi_timer_cpu_online, nmi_timer_cpu_predown);
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if (err < 0) {
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nmi_timer_shutdown();
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return err;
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}
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}
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out:
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cpu_notifier_register_done();
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return err;
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hp_online = err;
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return 0;
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}
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int __init op_nmi_timer_init(struct oprofile_operations *ops)
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