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authorBjoern Brandenburg <bbb@mpi-sws.org>2013-06-26 12:45:30 -0400
committerBjoern Brandenburg <bbb@mpi-sws.org>2013-08-07 03:46:39 -0400
commitee6ab6012870a6a3b60dc75560bb5118a37992d0 (patch)
tree12287ab82c60407f0f13c971b4993cad2217da43 /kernel
parent5ef7e2dad47bce26ce3afd0c402f6cc185e75ad6 (diff)
Add SCHED, SCHED2, TICK, and CXS overhead tracepoints
This patch integrates the overhead tracepoints into the Linux scheduler that are compatible with plain vanilla Linux (i.e., not specific to LITMUS^RT plugins). This can be used to measure the overheads of an otherwise unmodified kernel.
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/core.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a4c8c093f6bc..5a51ce671fd2 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -86,6 +86,8 @@
86#include "../workqueue_internal.h" 86#include "../workqueue_internal.h"
87#include "../smpboot.h" 87#include "../smpboot.h"
88 88
89#include <litmus/trace.h>
90
89#define CREATE_TRACE_POINTS 91#define CREATE_TRACE_POINTS
90#include <trace/events/sched.h> 92#include <trace/events/sched.h>
91 93
@@ -2742,6 +2744,8 @@ void scheduler_tick(void)
2742 2744
2743 sched_clock_tick(); 2745 sched_clock_tick();
2744 2746
2747 TS_TICK_START(current);
2748
2745 raw_spin_lock(&rq->lock); 2749 raw_spin_lock(&rq->lock);
2746 update_rq_clock(rq); 2750 update_rq_clock(rq);
2747 update_cpu_load_active(rq); 2751 update_cpu_load_active(rq);
@@ -2755,6 +2759,8 @@ void scheduler_tick(void)
2755 trigger_load_balance(rq, cpu); 2759 trigger_load_balance(rq, cpu);
2756#endif 2760#endif
2757 rq_last_tick_reset(rq); 2761 rq_last_tick_reset(rq);
2762
2763 TS_TICK_END(current);
2758} 2764}
2759 2765
2760#ifdef CONFIG_NO_HZ_FULL 2766#ifdef CONFIG_NO_HZ_FULL
@@ -2966,6 +2972,8 @@ need_resched:
2966 rcu_note_context_switch(cpu); 2972 rcu_note_context_switch(cpu);
2967 prev = rq->curr; 2973 prev = rq->curr;
2968 2974
2975 TS_SCHED_START;
2976
2969 schedule_debug(prev); 2977 schedule_debug(prev);
2970 2978
2971 if (sched_feat(HRTICK)) 2979 if (sched_feat(HRTICK))
@@ -3012,7 +3020,10 @@ need_resched:
3012 rq->curr = next; 3020 rq->curr = next;
3013 ++*switch_count; 3021 ++*switch_count;
3014 3022
3023 TS_SCHED_END(next);
3024 TS_CXS_START(next);
3015 context_switch(rq, prev, next); /* unlocks the rq */ 3025 context_switch(rq, prev, next); /* unlocks the rq */
3026 TS_CXS_END(current);
3016 /* 3027 /*
3017 * The context switch have flipped the stack from under us 3028 * The context switch have flipped the stack from under us
3018 * and restored the local variables which were saved when 3029 * and restored the local variables which were saved when
@@ -3021,12 +3032,19 @@ need_resched:
3021 */ 3032 */
3022 cpu = smp_processor_id(); 3033 cpu = smp_processor_id();
3023 rq = cpu_rq(cpu); 3034 rq = cpu_rq(cpu);
3024 } else 3035 } else {
3036 TS_SCHED_END(prev);
3025 raw_spin_unlock_irq(&rq->lock); 3037 raw_spin_unlock_irq(&rq->lock);
3038 }
3039
3040 TS_SCHED2_START(prev);
3026 3041
3027 post_schedule(rq); 3042 post_schedule(rq);
3028 3043
3029 sched_preempt_enable_no_resched(); 3044 sched_preempt_enable_no_resched();
3045
3046 TS_SCHED2_END(prev);
3047
3030 if (need_resched()) 3048 if (need_resched())
3031 goto need_resched; 3049 goto need_resched;
3032} 3050}