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authorThomas Gleixner <tglx@linutronix.de>2016-07-13 20:16:09 +0300
committerIngo Molnar <mingo@kernel.org>2016-07-14 10:34:31 +0300
commit00e16c3d68fce504e880f59c9bdf23b2a4759d6d (patch)
tree3cc21403349b617e70b2fb4dad59745a3dab3783 /include/linux/perf_event.h
parent7fbbaebf8cd18cca58e84837fd80c07ea8d8bd56 (diff)
downloadlinux-00e16c3d68fce504e880f59c9bdf23b2a4759d6d.tar.xz
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 'include/linux/perf_event.h')
-rw-r--r--include/linux/perf_event.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 1a827cecd62f..9abeb6948e70 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1354,4 +1354,13 @@ _name##_show(struct device *dev, \
\
static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
+/* Performance counter hotplug functions */
+#ifdef CONFIG_PERF_EVENTS
+int perf_event_init_cpu(unsigned int cpu);
+int perf_event_exit_cpu(unsigned int cpu);
+#else
+#define perf_event_init_cpu NULL
+#define perf_event_exit_cpu NULL
+#endif
+
#endif /* _LINUX_PERF_EVENT_H */