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/*
* sched_task_trace.c -- record scheduling events to a byte stream
*/
#define NO_TASK_TRACE_DECLS
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/percpu.h>
#include <litmus/ftdev.h>
#include <litmus/litmus.h>
#include <litmus/sched_trace.h>
#include <litmus/feather_trace.h>
#include <litmus/ftdev.h>
/* set MAJOR to 0 to have it dynamically assigned */
#define FT_TASK_TRACE_MAJOR 253
#define NO_EVENTS 4096 /* this is a buffer of 12 4k pages per CPU */
#define now() litmus_clock()
struct local_buffer {
struct st_event_record record[NO_EVENTS];
char flag[NO_EVENTS];
struct ft_buffer ftbuf;
};
DEFINE_PER_CPU(struct local_buffer, st_event_buffer);
static struct ftdev st_dev;
static int st_dev_can_open(struct ftdev *dev, unsigned int cpu)
{
return cpu_online(cpu) ? 0 : -ENODEV;
}
static int __init init_sched_task_trace(void)
{
struct local_buffer* buf;
int i, ok = 0;
ftdev_init(&st_dev, THIS_MODULE);
for (i = 0; i < NR_CPUS; i++) {
buf = &per_cpu(st_event_buffer, i);
ok += init_ft_buffer(&buf->ftbuf, NO_EVENTS,
sizeof(struct st_event_record),
buf->flag,
buf->record);
st_dev.minor[i].buf = &buf->ftbuf;
}
if (ok == NR_CPUS) {
st_dev.minor_cnt = NR_CPUS;
st_dev.can_open = st_dev_can_open;
return register_ftdev(&st_dev, "sched_trace", FT_TASK_TRACE_MAJOR);
} else {
return -EINVAL;
}
}
module_init(init_sched_task_trace);
static inline struct st_event_record* get_record(u8 type, struct task_struct* t)
{
struct st_event_record* rec = NULL;
struct local_buffer* buf;
buf = &get_cpu_var(st_event_buffer);
if (ft_buffer_start_write(&buf->ftbuf, (void**) &rec)) {
rec->hdr.type = type;
rec->hdr.cpu = smp_processor_id();
rec->hdr.pid = t ? t->pid : 0;
rec->hdr.job = t ? t->rt_param.job_params.job_no : 0;
} else {
put_cpu_var(st_event_buffer);
}
/* rec will be NULL if it failed */
return rec;
}
static inline void put_record(struct st_event_record* rec)
{
struct local_buffer* buf;
buf = &__get_cpu_var(st_event_buffer);
ft_buffer_finish_write(&buf->ftbuf, rec);
put_cpu_var(st_event_buffer);
}
feather_callback void do_sched_trace_task_name(unsigned long id, unsigned long _task)
{
struct task_struct *t = (struct task_struct*) _task;
struct st_event_record* rec = get_record(ST_NAME, t);
int i;
if (rec) {
for (i = 0; i < min(TASK_COMM_LEN, ST_NAME_LEN); i++)
rec->data.name.cmd[i] = t->comm[i];
put_record(rec);
}
}
feather_callback void do_sched_trace_task_param(unsigned long id, unsigned long _task)
{
struct task_struct *t = (struct task_struct*) _task;
struct st_event_record* rec = get_record(ST_PARAM, t);
if (rec) {
rec->data.param.wcet = get_exec_cost(t);
rec->data.param.period = get_rt_period(t);
rec->data.param.phase = get_rt_phase(t);
rec->data.param.partition = get_partition(t);
put_record(rec);
}
}
feather_callback void do_sched_trace_task_release(unsigned long id, unsigned long _task)
{
struct task_struct *t = (struct task_struct*) _task;
struct st_event_record* rec = get_record(ST_RELEASE, t);
if (rec) {
rec->data.release.release = get_release(t);
rec->data.release.deadline = get_deadline(t);
put_record(rec);
}
}
/* skipped: st_assigned_data, we don't use it atm */
feather_callback void do_sched_trace_task_switch_to(unsigned long id,
unsigned long _task)
{
struct task_struct *t = (struct task_struct*) _task;
struct st_event_record* rec;
if (is_realtime(t)) {
rec = get_record(ST_SWITCH_TO, t);
if (rec) {
rec->data.switch_to.when = now();
rec->data.switch_to.exec_time = get_exec_time(t);
put_record(rec);
}
}
}
feather_callback void do_sched_trace_task_switch_away(unsigned long id,
unsigned long _task)
{
struct task_struct *t = (struct task_struct*) _task;
struct st_event_record* rec;
if (is_realtime(t)) {
rec = get_record(ST_SWITCH_AWAY, t);
if (rec) {
rec->data.switch_away.when = now();
rec->data.switch_away.exec_time = get_exec_time(t);
put_record(rec);
}
}
}
feather_callback void do_sched_trace_task_completion(unsigned long id,
unsigned long _task,
unsigned long forced)
{
struct task_struct *t = (struct task_struct*) _task;
struct st_event_record* rec = get_record(ST_COMPLETION, t);
if (rec) {
rec->data.completion.when = now();
rec->data.completion.forced = forced;
put_record(rec);
}
}
feather_callback void do_sched_trace_task_block(unsigned long id,
unsigned long _task)
{
struct task_struct *t = (struct task_struct*) _task;
struct st_event_record* rec = get_record(ST_BLOCK, t);
if (rec) {
rec->data.block.when = now();
put_record(rec);
}
}
feather_callback void do_sched_trace_task_resume(unsigned long id,
unsigned long _task)
{
struct task_struct *t = (struct task_struct*) _task;
struct st_event_record* rec = get_record(ST_RESUME, t);
if (rec) {
rec->data.resume.when = now();
put_record(rec);
}
}
feather_callback void do_sched_trace_sys_release(unsigned long id,
unsigned long _start)
{
lt_t *start = (lt_t*) _start;
struct st_event_record* rec = get_record(ST_SYS_RELEASE, NULL);
if (rec) {
rec->data.sys_release.when = now();
rec->data.sys_release.release = *start;
put_record(rec);
}
}
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