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authorIngo Molnar <mingo@elte.hu>2008-02-28 21:00:21 +0100
committerIngo Molnar <mingo@elte.hu>2008-04-19 19:44:57 +0200
commit27ec4407790d075c325e1f4da0a19c56953cce23 (patch)
treed8c068c4743394eab173995bf085a99dfec257c7
parent018d6db4cb5bbdcd65424a16f2dcca692ed32ae4 (diff)
sched: make cpu_clock() globally synchronous
Alexey Zaytsev reported (and bisected) that the introduction of cpu_clock() in printk made the timestamps jump back and forth. Make cpu_clock() more reliable while still keeping it fast when it's called frequently. Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/sched.c52
1 files changed, 49 insertions, 3 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 8dcdec6fe0f..7377222ab42 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -632,11 +632,39 @@ int sysctl_sched_rt_runtime = 950000;
*/
#define RUNTIME_INF ((u64)~0ULL)
+static const unsigned long long time_sync_thresh = 100000;
+
+static DEFINE_PER_CPU(unsigned long long, time_offset);
+static DEFINE_PER_CPU(unsigned long long, prev_cpu_time);
+
/*
- * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
- * clock constructed from sched_clock():
+ * Global lock which we take every now and then to synchronize
+ * the CPUs time. This method is not warp-safe, but it's good
+ * enough to synchronize slowly diverging time sources and thus
+ * it's good enough for tracing:
*/
-unsigned long long cpu_clock(int cpu)
+static DEFINE_SPINLOCK(time_sync_lock);
+static unsigned long long prev_global_time;
+
+static unsigned long long __sync_cpu_clock(cycles_t time, int cpu)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&time_sync_lock, flags);
+
+ if (time < prev_global_time) {
+ per_cpu(time_offset, cpu) += prev_global_time - time;
+ time = prev_global_time;
+ } else {
+ prev_global_time = time;
+ }
+
+ spin_unlock_irqrestore(&time_sync_lock, flags);
+
+ return time;
+}
+
+static unsigned long long __cpu_clock(int cpu)
{
unsigned long long now;
unsigned long flags;
@@ -657,6 +685,24 @@ unsigned long long cpu_clock(int cpu)
return now;
}
+
+/*
+ * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
+ * clock constructed from sched_clock():
+ */
+unsigned long long cpu_clock(int cpu)
+{
+ unsigned long long prev_cpu_time, time, delta_time;
+
+ prev_cpu_time = per_cpu(prev_cpu_time, cpu);
+ time = __cpu_clock(cpu) + per_cpu(time_offset, cpu);
+ delta_time = time-prev_cpu_time;
+
+ if (unlikely(delta_time > time_sync_thresh))
+ time = __sync_cpu_clock(time, cpu);
+
+ return time;
+}
EXPORT_SYMBOL_GPL(cpu_clock);
#ifndef prepare_arch_switch