From 0a16b6075843325dc402edf80c1662838b929aff Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Fri, 18 Jul 2008 12:16:17 -0400 Subject: tracing, sched: LTTng instrumentation - scheduler Instrument the scheduler activity (sched_switch, migration, wakeups, wait for a task, signal delivery) and process/thread creation/destruction (fork, exit, kthread stop). Actually, kthread creation is not instrumented in this patch because it is architecture dependent. It allows to connect tracers such as ftrace which detects scheduling latencies, good/bad scheduler decisions. Tools like LTTng can export this scheduler information along with instrumentation of the rest of the kernel activity to perform post-mortem analysis on the scheduler activity. About the performance impact of tracepoints (which is comparable to markers), even without immediate values optimizations, tests done by Hideo Aoki on ia64 show no regression. His test case was using hackbench on a kernel where scheduler instrumentation (about 5 events in code scheduler code) was added. See the "Tracepoints" patch header for performance result detail. Changelog : - Change instrumentation location and parameter to match ftrace instrumentation, previously done with kernel markers. [ mingo@elte.hu: conflict resolutions ] Signed-off-by: Mathieu Desnoyers Acked-by: 'Peter Zijlstra' Signed-off-by: Ingo Molnar --- include/trace/sched.h | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 include/trace/sched.h (limited to 'include/trace') diff --git a/include/trace/sched.h b/include/trace/sched.h new file mode 100644 index 0000000..506ae13 --- /dev/null +++ b/include/trace/sched.h @@ -0,0 +1,45 @@ +#ifndef _TRACE_SCHED_H +#define _TRACE_SCHED_H + +#include +#include + +DEFINE_TRACE(sched_kthread_stop, + TPPROTO(struct task_struct *t), + TPARGS(t)); +DEFINE_TRACE(sched_kthread_stop_ret, + TPPROTO(int ret), + TPARGS(ret)); +DEFINE_TRACE(sched_wait_task, + TPPROTO(struct rq *rq, struct task_struct *p), + TPARGS(rq, p)); +DEFINE_TRACE(sched_wakeup, + TPPROTO(struct rq *rq, struct task_struct *p), + TPARGS(rq, p)); +DEFINE_TRACE(sched_wakeup_new, + TPPROTO(struct rq *rq, struct task_struct *p), + TPARGS(rq, p)); +DEFINE_TRACE(sched_switch, + TPPROTO(struct rq *rq, struct task_struct *prev, + struct task_struct *next), + TPARGS(rq, prev, next)); +DEFINE_TRACE(sched_migrate_task, + TPPROTO(struct rq *rq, struct task_struct *p, int dest_cpu), + TPARGS(rq, p, dest_cpu)); +DEFINE_TRACE(sched_process_free, + TPPROTO(struct task_struct *p), + TPARGS(p)); +DEFINE_TRACE(sched_process_exit, + TPPROTO(struct task_struct *p), + TPARGS(p)); +DEFINE_TRACE(sched_process_wait, + TPPROTO(struct pid *pid), + TPARGS(pid)); +DEFINE_TRACE(sched_process_fork, + TPPROTO(struct task_struct *parent, struct task_struct *child), + TPARGS(parent, child)); +DEFINE_TRACE(sched_signal_send, + TPPROTO(int sig, struct task_struct *p), + TPARGS(sig, p)); + +#endif -- cgit v1.1