perf: Kick full dynticks CPU if events rotation is needed
Kick the current CPU's tick by sending it a self IPI when an event is queued on the rotation list and it is the first element inserted. This makes sure that perf_event_task_tick() works on full dynticks CPUs. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Christoph Lameter <cl@linux.com> Cc: Geoff Levand <geoff@infradead.org> Cc: Gilad Ben Yossef <gilad@benyossef.com> Cc: Hakan Akkan <hakanakkan@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Kevin Hilman <khilman@linaro.org> Cc: Li Zhong <zhong@linux.vnet.ibm.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Stephane Eranian <eranian@google.com> Cc: Jiri Olsa <jolsa@redhat.com>
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@ -18,6 +18,7 @@
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/hash.h>
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#include <linux/tick.h>
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#include <linux/sysfs.h>
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#include <linux/dcache.h>
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#include <linux/percpu.h>
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@ -655,8 +656,12 @@ static void perf_pmu_rotate_start(struct pmu *pmu)
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WARN_ON(!irqs_disabled());
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if (list_empty(&cpuctx->rotation_list))
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if (list_empty(&cpuctx->rotation_list)) {
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int was_empty = list_empty(head);
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list_add(&cpuctx->rotation_list, head);
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if (was_empty)
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tick_nohz_full_kick();
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}
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}
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static void get_ctx(struct perf_event_context *ctx)
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