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authorThomas Gleixner <tglx@linutronix.de>2016-07-13 17:16:09 +0000
committerIngo Molnar <mingo@kernel.org>2016-07-14 09:34:31 +0200
commit00e16c3d68fce504e880f59c9bdf23b2a4759d6d (patch)
tree3cc21403349b617e70b2fb4dad59745a3dab3783 /kernel/cpu.c
parent7fbbaebf8cd18cca58e84837fd80c07ea8d8bd56 (diff)
downloadlinux-00e16c3d68fce504e880f59c9bdf23b2a4759d6d.tar.bz2
perf/core: Convert to hotplug state machine
Actually a nice symmetric startup/teardown pair which fits properly into the state machine concept. In the long run we should be able to invoke the startup callback for the boot CPU via the state machine and get rid of the init function which invokes it on the boot CPU. Note: This comes actually before the perf hardware callbacks. In the notifier model the hardware callbacks have a higher priority than the core callback. But that's solely for CPU offline so that hardware migration of events happens before the core is notified about the outgoing CPU. With the symetric state array model we have the following ordering: UP: core -> hardware DOWN: hardware -> core Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de> Reviewed-by: Sebastian Siewior <bigeasy@linutronix.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20160713153333.587514098@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/cpu.c')
-rw-r--r--kernel/cpu.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index fe71ce4e60f1..3705d9043c08 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1180,6 +1180,11 @@ static struct cpuhp_step cpuhp_bp_states[] = {
.teardown = NULL,
.cant_stop = true,
},
+ [CPUHP_PERF_PREPARE] = {
+ .name = "perf prepare",
+ .startup = perf_event_init_cpu,
+ .teardown = perf_event_exit_cpu,
+ },
/*
* Preparatory and dead notifiers. Will be replaced once the notifiers
* are converted to states.
@@ -1257,6 +1262,12 @@ static struct cpuhp_step cpuhp_ap_states[] = {
.startup = smpboot_unpark_threads,
.teardown = NULL,
},
+ [CPUHP_AP_PERF_ONLINE] = {
+ .name = "perf online",
+ .startup = perf_event_init_cpu,
+ .teardown = perf_event_exit_cpu,
+ },
+
/*
* Online/down_prepare notifiers. Will be removed once the notifiers
* are converted to states.