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authorIngo Molnar <mingo@elte.hu>2007-07-19 21:28:35 +0200
committerIngo Molnar <mingo@elte.hu>2007-07-19 21:28:35 +0200
commite436d80085133858bf2613a630365e8a0459fd58 (patch)
treec579410a12ed63d94e3a40a023634c7df4aebc76 /include/linux
parent969bb4e4032dac67287951d8f6642a3b5119694e (diff)
[PATCH] sched: implement cpu_clock(cpu) high-speed time source
Implement the cpu_clock(cpu) interface for kernel-internal use: high-speed (but slightly incorrect) per-cpu clock constructed from sched_clock(). This API, unused at the moment, will be used in the future by blktrace, by the softlockup-watchdog, by printk and by lockstat. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/sched.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 94f624aef01..33b9b4841ee 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1348,6 +1348,13 @@ static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
#endif
extern unsigned long long sched_clock(void);
+
+/*
+ * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
+ * clock constructed from sched_clock():
+ */
+extern unsigned long long cpu_clock(int cpu);
+
extern unsigned long long
task_sched_runtime(struct task_struct *task);