#include <linux/kallsyms.h>
#include <linux/uaccess.h>
#include <linux/ftrace.h>
+#include <linux/marker.h>
#include "trace.h"
static DEFINE_SPINLOCK(wakeup_lock);
-static void notrace __wakeup_reset(struct trace_array *tr);
+static void __wakeup_reset(struct trace_array *tr);
/*
* Should this new latency be reported/recorded?
*/
-static int notrace report_latency(cycle_t delta)
+static int report_latency(cycle_t delta)
{
if (tracing_thresh) {
if (delta < tracing_thresh)
return 1;
}
-void notrace
-wakeup_sched_switch(struct task_struct *prev, struct task_struct *next)
+static void notrace
+wakeup_sched_switch(void *private, void *rq, struct task_struct *prev,
+ struct task_struct *next)
{
unsigned long latency = 0, t0 = 0, t1 = 0;
- struct trace_array *tr = wakeup_trace;
+ struct trace_array **ptr = private;
+ struct trace_array *tr = *ptr;
struct trace_array_cpu *data;
cycle_t T0, T1, delta;
unsigned long flags;
update_max_tr(tr, wakeup_task, wakeup_cpu);
- if (tracing_thresh) {
- printk(KERN_INFO "(%16s-%-5d|#%d):"
- " %lu us wakeup latency violates %lu us threshold.\n",
- wakeup_task->comm, wakeup_task->pid,
- raw_smp_processor_id(),
- latency, nsecs_to_usecs(tracing_thresh));
- } else {
- printk(KERN_INFO "(%16s-%-5d|#%d):"
- " new %lu us maximum wakeup latency.\n",
- wakeup_task->comm, wakeup_task->pid,
- cpu, latency);
- }
-
out_unlock:
__wakeup_reset(tr);
spin_unlock_irqrestore(&wakeup_lock, flags);
atomic_dec(&tr->data[cpu]->disabled);
}
-static void notrace __wakeup_reset(struct trace_array *tr)
+static notrace void
+sched_switch_callback(void *probe_data, void *call_data,
+ const char *format, va_list *args)
+{
+ struct task_struct *prev;
+ struct task_struct *next;
+ struct rq *__rq;
+
+ /* skip prev_pid %d next_pid %d prev_state %ld */
+ (void)va_arg(*args, int);
+ (void)va_arg(*args, int);
+ (void)va_arg(*args, long);
+ __rq = va_arg(*args, typeof(__rq));
+ prev = va_arg(*args, typeof(prev));
+ next = va_arg(*args, typeof(next));
+
+ tracing_record_cmdline(prev);
+
+ /*
+ * If tracer_switch_func only points to the local
+ * switch func, it still needs the ptr passed to it.
+ */
+ wakeup_sched_switch(probe_data, __rq, prev, next);
+}
+
+static void __wakeup_reset(struct trace_array *tr)
{
struct trace_array_cpu *data;
int cpu;
wakeup_task = NULL;
}
-static void notrace wakeup_reset(struct trace_array *tr)
+static void wakeup_reset(struct trace_array *tr)
{
unsigned long flags;
spin_unlock_irqrestore(&wakeup_lock, flags);
}
-static notrace void
+static void
wakeup_check_start(struct trace_array *tr, struct task_struct *p,
struct task_struct *curr)
{
atomic_dec(&tr->data[cpu]->disabled);
}
-notrace void
-ftrace_wake_up_task(struct task_struct *wakee, struct task_struct *curr)
+static notrace void
+wake_up_callback(void *probe_data, void *call_data,
+ const char *format, va_list *args)
{
+ struct trace_array **ptr = probe_data;
+ struct trace_array *tr = *ptr;
+ struct task_struct *curr;
+ struct task_struct *task;
+ struct rq *__rq;
+
if (likely(!tracer_enabled))
return;
- wakeup_check_start(wakeup_trace, wakee, curr);
+ /* Skip pid %d state %ld */
+ (void)va_arg(*args, int);
+ (void)va_arg(*args, long);
+ /* now get the meat: "rq %p task %p rq->curr %p" */
+ __rq = va_arg(*args, typeof(__rq));
+ task = va_arg(*args, typeof(task));
+ curr = va_arg(*args, typeof(curr));
+
+ tracing_record_cmdline(task);
+ tracing_record_cmdline(curr);
+
+ wakeup_check_start(tr, task, curr);
}
-notrace void
-ftrace_wake_up_new_task(struct task_struct *wakee, struct task_struct *curr)
+static void start_wakeup_tracer(struct trace_array *tr)
{
- if (likely(!tracer_enabled))
+ int ret;
+
+ ret = marker_probe_register("kernel_sched_wakeup",
+ "pid %d state %ld ## rq %p task %p rq->curr %p",
+ wake_up_callback,
+ &wakeup_trace);
+ if (ret) {
+ pr_info("wakeup trace: Couldn't add marker"
+ " probe to kernel_sched_wakeup\n");
return;
+ }
- wakeup_check_start(wakeup_trace, wakee, curr);
-}
+ ret = marker_probe_register("kernel_sched_wakeup_new",
+ "pid %d state %ld ## rq %p task %p rq->curr %p",
+ wake_up_callback,
+ &wakeup_trace);
+ if (ret) {
+ pr_info("wakeup trace: Couldn't add marker"
+ " probe to kernel_sched_wakeup_new\n");
+ goto fail_deprobe;
+ }
+
+ ret = marker_probe_register("kernel_sched_schedule",
+ "prev_pid %d next_pid %d prev_state %ld "
+ "## rq %p prev %p next %p",
+ sched_switch_callback,
+ &wakeup_trace);
+ if (ret) {
+ pr_info("sched trace: Couldn't add marker"
+ " probe to kernel_sched_schedule\n");
+ goto fail_deprobe_wake_new;
+ }
-static notrace void start_wakeup_tracer(struct trace_array *tr)
-{
wakeup_reset(tr);
/*
tracer_enabled = 1;
return;
+fail_deprobe_wake_new:
+ marker_probe_unregister("kernel_sched_wakeup_new",
+ wake_up_callback,
+ &wakeup_trace);
+fail_deprobe:
+ marker_probe_unregister("kernel_sched_wakeup",
+ wake_up_callback,
+ &wakeup_trace);
}
-static notrace void stop_wakeup_tracer(struct trace_array *tr)
+static void stop_wakeup_tracer(struct trace_array *tr)
{
tracer_enabled = 0;
+ marker_probe_unregister("kernel_sched_schedule",
+ sched_switch_callback,
+ &wakeup_trace);
+ marker_probe_unregister("kernel_sched_wakeup_new",
+ wake_up_callback,
+ &wakeup_trace);
+ marker_probe_unregister("kernel_sched_wakeup",
+ wake_up_callback,
+ &wakeup_trace);
}
-static notrace void wakeup_tracer_init(struct trace_array *tr)
+static void wakeup_tracer_init(struct trace_array *tr)
{
wakeup_trace = tr;
start_wakeup_tracer(tr);
}
-static notrace void wakeup_tracer_reset(struct trace_array *tr)
+static void wakeup_tracer_reset(struct trace_array *tr)
{
if (tr->ctrl) {
stop_wakeup_tracer(tr);
stop_wakeup_tracer(tr);
}
-static void notrace wakeup_tracer_open(struct trace_iterator *iter)
+static void wakeup_tracer_open(struct trace_iterator *iter)
{
/* stop the trace while dumping */
if (iter->tr->ctrl)
stop_wakeup_tracer(iter->tr);
}
-static void notrace wakeup_tracer_close(struct trace_iterator *iter)
+static void wakeup_tracer_close(struct trace_iterator *iter)
{
/* forget about any processes we were recording */
if (iter->tr->ctrl)
projects / linux-2.6 / blobdiff