perf: Migrate per cpu event accounting

When an event is migrated, move the event per-cpu
accounting accordingly so that branch stack and cgroup
events work correctly on the new CPU.

Original-patch-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1374539466-4799-6-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 3a4b73aebc42..63bdec9fdd21 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7145,6 +7145,7 @@ void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu)
         list_for_each_entry_safe(event, tmp, &src_ctx->event_list,
                                  event_entry) {
                 perf_remove_from_context(event);
+                unaccount_event_cpu(event, src_cpu);
                 put_ctx(src_ctx);
                 list_add(&event->event_entry, &events);
         }
@@ -7157,6 +7158,7 @@ void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu)
                 list_del(&event->event_entry);
                 if (event->state >= PERF_EVENT_STATE_OFF)
                         event->state = PERF_EVENT_STATE_INACTIVE;
+                account_event_cpu(event, dst_cpu);
                 perf_install_in_context(dst_ctx, event, dst_cpu);
                 get_ctx(dst_ctx);
         }