linux/kernel/trace/trace_sched_switch.c, branch v2.6.30

ftrace: Add check of sched_stopped for probe_sched_wakeup

2009-04-07T12:01:11Z

The wakeup tracing in sched_switch does not stop when a user disables tracing. This is because the probe_sched_wakeup() is missing the check to prevent the wakeup from being traced. Signed-off-by: Zhao Lei LKML-Reference: <49D1C543.3010307@cn.fujitsu.com> Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar

tracing: make sched_switch stop/start light weight

2009-03-18T03:10:45Z

The stopping and starting of a tracer should be light weight and be able to be called in all contexts. The sched_switch grabbed mutexes in the start/stop functions. This patch changes it to a simple variable, on/off. Signed-off-by: Steven Rostedt

tracing/core: use appropriate waiting on trace_pipe

2009-02-18T00:40:20Z

Impact: api and pipe waiting change Currently, the waiting used in tracing_read_pipe() is done through a 100 msecs schedule_timeout() loop which periodically check if there are traces on the buffer. This can cause small latencies for programs which are reading the incoming events. This patch makes the reader waiting for the trace_wait waitqueue except for few tracers such as the sched and functions tracers which might be already hold the runqueue lock while waking up the reader. This is performed through a new callback wait_pipe() on struct tracer. If none is implemented on a specific tracer, the default waiting for trace_wait queue is attached. Signed-off-by: Frederic Weisbecker Signed-off-by: Ingo Molnar

tracing: fix typing mistake in hint message and comments

2009-02-17T17:38:24Z

Impact: cleanup Fix incorrect hint message in code and typos in comments. Signed-off-by: Wenji Huang Signed-off-by: Steven Rostedt

trace: Call tracing_reset_online_cpus before tracer->init()

2009-02-06T00:01:41Z

Impact: cleanup To make it easy for ftrace plugin writers, as this was open coded in the existing plugins Signed-off-by: Arnaldo Carvalho de Melo Acked-by: Frédéric Weisbecker Signed-off-by: Ingo Molnar

trace: Remove unused trace_array_cpu parameter

2009-02-05T13:35:47Z

Impact: cleanup Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar

sched, trace: update trace_sched_wakeup()

2008-12-25T12:10:21Z

Impact: extend the wakeup tracepoint with the info whether the wakeup was real Add the information needed to distinguish 'real' wakeups from 'false' wakeups. Signed-off-by: Peter Zijlstra Signed-off-by: Ingo Molnar

ftrace: introduce tracing_reset_online_cpus() helper

2008-12-19T15:29:34Z

Impact: cleanup This patch factors out common code from multiple tracers into a tracing_reset_online_cpus() function and converts the tracers to use it. Signed-off-by: Pekka Enberg Signed-off-by: Ingo Molnar

tracing: fix warnings in kernel/trace/trace_sched_switch.c

2008-12-19T00:05:38Z

these warnings: kernel/trace/trace_sched_switch.c: In function ‘tracing_sched_register’: kernel/trace/trace_sched_switch.c:96: warning: passing argument 1 of ‘register_trace_sched_wakeup_new’ from incompatible pointer type kernel/trace/trace_sched_switch.c:112: warning: passing argument 1 of ‘unregister_trace_sched_wakeup_new’ from incompatible pointer type kernel/trace/trace_sched_switch.c: In function ‘tracing_sched_unregister’: kernel/trace/trace_sched_switch.c:121: warning: passing argument 1 of ‘unregister_trace_sched_wakeup_new’ from incompatible pointer type Trigger because sched_wakeup_new tracepoints need the same trace signature as sched_wakeup - which was changed recently. Fix it. Signed-off-by: Ingo Molnar

tracing/ftrace: change the type of the init() callback

2008-11-16T06:55:23Z

Impact: extend the ->init() method with the ability to fail This bring a way to know if the initialization of a tracer successed. A tracer must return 0 on success and a traditional error (ie: -ENOMEM) if it fails. If a tracer fails to init, it is free to print a detailed warn. The tracing api will not and switch to a new tracer will just return the error from the init callback. Note: this will be used for the return tracer. Signed-off-by: Frederic Weisbecker Signed-off-by: Ingo Molnar