sched: debug, improve migration statistics

add new migration statistics when SCHED_DEBUG and SCHEDSTATS
is enabled. Available in /proc/<PID>/sched.

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

1 files changed, 77 insertions, 10 deletions

diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 755815937417..27e82cbccaa5 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -260,6 +260,7 @@ __initcall(init_sched_debug_procfs);
 
 void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 {
+        unsigned long nr_switches;
         unsigned long flags;
         int num_threads = 1;
 
@@ -273,8 +274,12 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
         SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads);
         SEQ_printf(m,
                 "---------------------------------------------------------\n");
+#define __P(F) \
+        SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F)
 #define P(F) \
         SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F)
+#define __PN(F) \
+        SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
 #define PN(F) \
         SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
 
@@ -282,6 +287,8 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
         PN(se.vruntime);
         PN(se.sum_exec_runtime);
 
+        nr_switches = p->nvcsw + p->nivcsw;
+
 #ifdef CONFIG_SCHEDSTATS
         PN(se.wait_start);
         PN(se.sleep_start);
@@ -292,14 +299,55 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
         PN(se.slice_max);
         PN(se.wait_max);
         P(sched_info.bkl_count);
+        P(se.nr_migrations);
+        P(se.nr_migrations_cold);
+        P(se.nr_failed_migrations_affine);
+        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);
+        P(se.nr_wakeups_local);
+        P(se.nr_wakeups_remote);
+        P(se.nr_wakeups_affine);
+        P(se.nr_wakeups_affine_attempts);
+        P(se.nr_wakeups_passive);
+        P(se.nr_wakeups_idle);
+
+        {
+                u64 avg_atom, avg_per_cpu;
+
+                avg_atom = p->se.sum_exec_runtime;
+                if (nr_switches)
+                        do_div(avg_atom, nr_switches);
+                else
+                        avg_atom = -1LL;
+
+                avg_per_cpu = p->se.sum_exec_runtime;
+                if (p->se.nr_migrations)
+                        avg_per_cpu = div64_64(avg_per_cpu, p->se.nr_migrations);
+                else
+                        avg_per_cpu = -1LL;
+
+                __PN(avg_atom);
+                __PN(avg_per_cpu);
+        }
 #endif
+        __P(nr_switches);
         SEQ_printf(m, "%-35s:%21Ld\n",
-                   "nr_switches", (long long)(p->nvcsw + p->nivcsw));
+                   "nr_voluntary_switches", (long long)p->nvcsw);
+        SEQ_printf(m, "%-35s:%21Ld\n",
+                   "nr_involuntary_switches", (long long)p->nivcsw);
+
         P(se.load.weight);
         P(policy);
         P(prio);
-#undef P
 #undef PN
+#undef __PN
+#undef P
+#undef __P
 
         {
                 u64 t0, t1;
@@ -314,13 +362,32 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 void proc_sched_set_task(struct task_struct *p)
 {
 #ifdef CONFIG_SCHEDSTATS
-        p->se.sleep_max                 = 0;
-        p->se.block_max                 = 0;
-        p->se.exec_max                  = 0;
-        p->se.slice_max                 = 0;
-        p->se.wait_max                  = 0;
-        p->sched_info.bkl_count         = 0;
+        p->se.wait_max                          = 0;
+        p->se.sleep_max                         = 0;
+        p->se.sum_sleep_runtime                 = 0;
+        p->se.block_max                         = 0;
+        p->se.exec_max                          = 0;
+        p->se.slice_max                         = 0;
+        p->se.nr_migrations                     = 0;
+        p->se.nr_migrations_cold                = 0;
+        p->se.nr_failed_migrations_affine       = 0;
+        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;
+        p->se.nr_wakeups_local                  = 0;
+        p->se.nr_wakeups_remote                 = 0;
+        p->se.nr_wakeups_affine                 = 0;
+        p->se.nr_wakeups_affine_attempts        = 0;
+        p->se.nr_wakeups_passive                = 0;
+        p->se.nr_wakeups_idle                   = 0;
+        p->sched_info.bkl_count                 = 0;
 #endif
-        p->se.sum_exec_runtime          = 0;
-        p->se.prev_sum_exec_runtime     = 0;
+        p->se.sum_exec_runtime                  = 0;
+        p->se.prev_sum_exec_runtime             = 0;
+        p->nvcsw                                = 0;
+        p->nivcsw                               = 0;
 }