perf: Use hot regs with software sched switch/migrate events

[deliverable/linux.git] / arch / x86 / kernel / cpu / perf_event.c

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 045cc0bb4c17ab6ae6e7ee15ed1a7809c3b2f848..5fb490c6ee5ca8559e56bcb0f08faa37a26040b3 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -811,7 +811,6 @@ void hw_perf_enable(void)
                 * step2: reprogram moved events into new counters
                 */
                for (i = 0; i < n_running; i++) {
-
                        event = cpuc->event_list[i];
                        hwc = &event->hw;
 
@@ -826,17 +825,16 @@ void hw_perf_enable(void)
                                continue;
 
                        x86_pmu_stop(event);
-
-                       hwc->idx = -1;
                }
 
                for (i = 0; i < cpuc->n_events; i++) {
-
                        event = cpuc->event_list[i];
                        hwc = &event->hw;
 
-                       if (hwc->idx == -1)
+                       if (!match_prev_assignment(hwc, cpuc, i))
                                x86_assign_hw_event(event, cpuc, i);
+                       else if (i < n_running)
+                               continue;
 
                        x86_pmu_start(event);
                }
@@ -1703,3 +1701,15 @@ struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
 
        return entry;
 }
+
+void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int skip)
+{
+       regs->ip = ip;
+       /*
+        * perf_arch_fetch_caller_regs adds another call, we need to increment
+        * the skip level
+        */
+       regs->bp = rewind_frame_pointer(skip + 1);
+       regs->cs = __KERNEL_CS;
+       local_save_flags(regs->flags);
+}