perfcounters: add task migrations counter

Impact: add new feature, new sw counter

Add a counter that counts the number of cross-CPU migrations a
task is suffering.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 7 insertions, 4 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index d2a16563415f..f30486fc55d7 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -42,6 +42,8 @@ enum hw_event_types {
         PERF_COUNT_BRANCH_INSTRUCTIONS  =  4,
         PERF_COUNT_BRANCH_MISSES        =  5,
 
+        PERF_HW_EVENTS_MAX              =  6,
+
         /*
          * Special "software" counters provided by the kernel, even if
          * the hardware does not support performance counters. These
@@ -50,11 +52,11 @@ enum hw_event_types {
          */
         PERF_COUNT_CPU_CLOCK            = -1,
         PERF_COUNT_TASK_CLOCK           = -2,
-        /*
-         * Future software events:
-         */
         PERF_COUNT_PAGE_FAULTS          = -3,
         PERF_COUNT_CONTEXT_SWITCHES     = -4,
+        PERF_COUNT_CPU_MIGRATIONS       = -5,
+
+        PERF_SW_EVENTS_MIN              = -6,
 };
 
 /*
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4c530278391b..2e15be8fc792 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1014,6 +1014,8 @@ struct sched_entity {
         u64                     last_wakeup;
         u64                     avg_overlap;
 
+        u64                     nr_migrations;
+
 #ifdef CONFIG_SCHEDSTATS
         u64                     wait_start;
         u64                     wait_max;
@@ -1029,7 +1031,6 @@ struct sched_entity {
         u64                     exec_max;
         u64                     slice_max;
 
-        u64                     nr_migrations;
         u64                     nr_migrations_cold;
         u64                     nr_failed_migrations_affine;
         u64                     nr_failed_migrations_running;