sched: Remove forced2_migrations stats

This build warning:

 kernel/sched.c: In function 'set_task_cpu':
 kernel/sched.c:2070: warning: unused variable 'old_rq'

Made me realize that the forced2_migrations stat looks pretty
pointless (and a misnomer) - remove it.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/linux/sched.h b/include/linux/sched.h
index ee9f200d12d301c2950e3e95c0c97321cfe32e9d..87b89a827f0c5b364966d144e66f1404e96672ae 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1174,7 +1174,6 @@ struct sched_entity {
        u64                     nr_failed_migrations_running;
        u64                     nr_failed_migrations_hot;
        u64                     nr_forced_migrations;
-       u64                     nr_forced2_migrations;
 
        u64                     nr_wakeups;
        u64                     nr_wakeups_sync;

diff --git a/kernel/sched.c b/kernel/sched.c
index 36cc05a769477c9cf5f889f93cb324c51980f53e..bc68037f3199c1653f17a08df838304dee9dcb94 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2067,7 +2067,6 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
 void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
 {
        int old_cpu = task_cpu(p);
-       struct rq *old_rq = cpu_rq(old_cpu);
        struct cfs_rq *old_cfsrq = task_cfs_rq(p),
                      *new_cfsrq = cpu_cfs_rq(old_cfsrq, new_cpu);
 
@@ -2075,10 +2074,6 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
 
        if (old_cpu != new_cpu) {
                p->se.nr_migrations++;
-#ifdef CONFIG_SCHEDSTATS
-               if (task_hot(p, old_rq->clock, NULL))
-                       schedstat_inc(p, se.nr_forced2_migrations);
-#endif
                perf_sw_event(PERF_COUNT_SW_CPU_MIGRATIONS,
                                     1, 1, NULL, 0);
        }
@@ -2521,7 +2516,6 @@ static void __sched_fork(struct task_struct *p)
        p->se.nr_failed_migrations_running      = 0;
        p->se.nr_failed_migrations_hot          = 0;
        p->se.nr_forced_migrations              = 0;
-       p->se.nr_forced2_migrations             = 0;
 
        p->se.nr_wakeups                        = 0;
        p->se.nr_wakeups_sync                   = 0;

diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 0fc5287fe80f21d16937397523d2ba2141b2eb57..5ae24fc65d75c7f9435040b90851c6cdcdd4a579 100644 (file)
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -432,7 +432,6 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
        P(se.nr_failed_migrations_running);
        P(se.nr_failed_migrations_hot);
        P(se.nr_forced_migrations);
-       P(se.nr_forced2_migrations);
        P(se.nr_wakeups);
        P(se.nr_wakeups_sync);
        P(se.nr_wakeups_migrate);
@@ -508,7 +507,6 @@ void proc_sched_set_task(struct task_struct *p)
        p->se.nr_failed_migrations_running      = 0;
        p->se.nr_failed_migrations_hot          = 0;
        p->se.nr_forced_migrations              = 0;
-       p->se.nr_forced2_migrations             = 0;
        p->se.nr_wakeups                        = 0;
        p->se.nr_wakeups_sync                   = 0;
        p->se.nr_wakeups_migrate                = 0;