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/**
* Copyright (C) ARM Limited 2010-2011. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <trace/events/sched.h>
#include "gator.h"
#define SCHED_TIMER_EVENT 0
#define SCHED_WAIT_TASK 1
#define SCHED_WAKEUP 2
#define SCHED_WAKEUP_NEW 3
#define SCHED_SWITCH 4
#define SCHED_MIGRATE_TASK 5
#define SCHED_PROCESS_FREE 6
#define SCHED_PROCESS_EXIT 7
#define SCHED_PROCESS_WAIT 8
#define SCHED_PROCESS_FORK 9
#define SCHED_OVERFLOW -1
#define SCHEDSIZE (16*1024)
static DEFINE_PER_CPU(int *[2], theSchedBuf);
static DEFINE_PER_CPU(int, theSchedSel);
static DEFINE_PER_CPU(int, theSchedPos);
static DEFINE_PER_CPU(int, theSchedErr);
static void probe_sched_write(int type, int param1, int param2, int param3)
{
unsigned long flags;
int cpu = smp_processor_id();
uint64_t time = gator_get_time();
int *schedBuf;
int schedPos;
if (!per_cpu(theSchedBuf, cpu)[per_cpu(theSchedSel, cpu)])
return;
// disable interrupts to synchronize with gator_trace_sched_read(); spinlocks not needed since percpu buffers are used
local_irq_save(flags);
schedPos = per_cpu(theSchedPos, cpu);
schedBuf = per_cpu(theSchedBuf, cpu)[per_cpu(theSchedSel, cpu)];
if (schedPos < (SCHEDSIZE-100)) {
// capture
schedBuf[schedPos+0] = type;
schedBuf[schedPos+1] = (int)time;
schedBuf[schedPos+2] = (int)(time >> 32);
schedBuf[schedPos+3] = param1;
schedBuf[schedPos+4] = param2;
schedBuf[schedPos+5] = param3;
per_cpu(theSchedPos, cpu) = schedPos + 6;
} else if (!per_cpu(theSchedErr, cpu)) {
per_cpu(theSchedErr, cpu) = 1;
schedBuf[schedPos+0] = SCHED_OVERFLOW;
schedBuf[schedPos+1] = 0;
schedBuf[schedPos+2] = 0;
schedBuf[schedPos+3] = 0;
schedBuf[schedPos+4] = 0;
schedBuf[schedPos+5] = 0;
per_cpu(theSchedPos, cpu) = schedPos + 6;
pr_debug("gator: tracepoint overflow\n");
}
local_irq_restore(flags);
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35)
GATOR_DEFINE_PROBE(sched_wait_task, TP_PROTO(struct rq *rq, struct task_struct *p))
#else
GATOR_DEFINE_PROBE(sched_wait_task, TP_PROTO(struct task_struct *p))
#endif
{
probe_sched_write(SCHED_WAIT_TASK, 0, p->pid, 0);
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35)
GATOR_DEFINE_PROBE(sched_wakeup, TP_PROTO(struct rq *rq, struct task_struct *p, int success))
#else
GATOR_DEFINE_PROBE(sched_wakeup, TP_PROTO(struct task_struct *p, int success))
#endif
{
if (success)
probe_sched_write(SCHED_WAKEUP, 0, p->pid, 0);
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35)
GATOR_DEFINE_PROBE(sched_wakeup_new, TP_PROTO(struct rq *rq, struct task_struct *p, int success))
#else
GATOR_DEFINE_PROBE(sched_wakeup_new, TP_PROTO(struct task_struct *p, int success))
#endif
{
if (success)
probe_sched_write(SCHED_WAKEUP_NEW, 0, p->tgid, p->pid);
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35)
GATOR_DEFINE_PROBE(sched_switch, TP_PROTO(struct rq *rq, struct task_struct *prev, struct task_struct *next))
#else
GATOR_DEFINE_PROBE(sched_switch, TP_PROTO(struct task_struct *prev, struct task_struct *next))
#endif
{
probe_sched_write(SCHED_SWITCH, (int)next, next->tgid, next->pid);
}
GATOR_DEFINE_PROBE(sched_migrate_task, TP_PROTO(struct task_struct *p, int dest_cpu))
{
probe_sched_write(SCHED_MIGRATE_TASK, 0, dest_cpu, p->pid);
}
GATOR_DEFINE_PROBE(sched_process_free, TP_PROTO(struct task_struct *p))
{
probe_sched_write(SCHED_PROCESS_FREE, 0, p->pid, 0);
}
GATOR_DEFINE_PROBE(sched_process_exit, TP_PROTO(struct task_struct *p))
{
probe_sched_write(SCHED_PROCESS_EXIT, 0, p->pid, 0);
}
GATOR_DEFINE_PROBE(sched_process_wait, TP_PROTO(struct pid *pid))
{
probe_sched_write(SCHED_PROCESS_WAIT, 0, pid_nr(pid), 0);
}
GATOR_DEFINE_PROBE(sched_process_fork, TP_PROTO(struct task_struct *parent, struct task_struct *child))
{
probe_sched_write(SCHED_PROCESS_FORK, (int)child, parent->pid, child->pid);
}
int gator_trace_sched_init(void)
{
return 0;
}
int gator_trace_sched_start(void)
{
int cpu;
for_each_present_cpu(cpu) {
per_cpu(theSchedSel, cpu) = 0;
per_cpu(theSchedPos, cpu) = 0;
per_cpu(theSchedErr, cpu) = 0;
per_cpu(theSchedBuf, cpu)[0] = kmalloc(SCHEDSIZE * sizeof(int), GFP_KERNEL);
per_cpu(theSchedBuf, cpu)[1] = kmalloc(SCHEDSIZE * sizeof(int), GFP_KERNEL);
if (!per_cpu(theSchedBuf, cpu))
return -1;
}
// register tracepoints
if (GATOR_REGISTER_TRACE(sched_wait_task))
goto fail_sched_wait_task;
if (GATOR_REGISTER_TRACE(sched_wakeup))
goto fail_sched_wakeup;
if (GATOR_REGISTER_TRACE(sched_wakeup_new))
goto fail_sched_wakeup_new;
if (GATOR_REGISTER_TRACE(sched_switch))
goto fail_sched_switch;
if (GATOR_REGISTER_TRACE(sched_migrate_task))
goto fail_sched_migrate_task;
if (GATOR_REGISTER_TRACE(sched_process_free))
goto fail_sched_process_free;
if (GATOR_REGISTER_TRACE(sched_process_exit))
goto fail_sched_process_exit;
if (GATOR_REGISTER_TRACE(sched_process_wait))
goto fail_sched_process_wait;
if (GATOR_REGISTER_TRACE(sched_process_fork))
goto fail_sched_process_fork;
pr_debug("gator: registered tracepoints\n");
return 0;
// unregister tracepoints on error
fail_sched_process_fork:
GATOR_UNREGISTER_TRACE(sched_process_wait);
fail_sched_process_wait:
GATOR_UNREGISTER_TRACE(sched_process_exit);
fail_sched_process_exit:
GATOR_UNREGISTER_TRACE(sched_process_free);
fail_sched_process_free:
GATOR_UNREGISTER_TRACE(sched_migrate_task);
fail_sched_migrate_task:
GATOR_UNREGISTER_TRACE(sched_switch);
fail_sched_switch:
GATOR_UNREGISTER_TRACE(sched_wakeup_new);
fail_sched_wakeup_new:
GATOR_UNREGISTER_TRACE(sched_wakeup);
fail_sched_wakeup:
GATOR_UNREGISTER_TRACE(sched_wait_task);
fail_sched_wait_task:
pr_err("gator: tracepoints failed to activate, please verify that tracepoints are enabled in the linux kernel\n");
return -1;
}
void gator_trace_sched_stop(void)
{
int cpu;
GATOR_UNREGISTER_TRACE(sched_wait_task);
GATOR_UNREGISTER_TRACE(sched_wakeup);
GATOR_UNREGISTER_TRACE(sched_wakeup_new);
GATOR_UNREGISTER_TRACE(sched_switch);
GATOR_UNREGISTER_TRACE(sched_migrate_task);
GATOR_UNREGISTER_TRACE(sched_process_free);
GATOR_UNREGISTER_TRACE(sched_process_exit);
GATOR_UNREGISTER_TRACE(sched_process_wait);
GATOR_UNREGISTER_TRACE(sched_process_fork);
pr_debug("gator: unregistered tracepoints\n");
for_each_present_cpu(cpu) {
kfree(per_cpu(theSchedBuf, cpu)[0]);
kfree(per_cpu(theSchedBuf, cpu)[1]);
per_cpu(theSchedBuf, cpu)[0] = NULL;
per_cpu(theSchedBuf, cpu)[1] = NULL;
}
}
int gator_trace_sched_read(int **buffer)
{
uint64_t time = gator_get_time();
int cpu = smp_processor_id();
unsigned long flags;
int *schedBuf;
int schedPos;
int i;
if (!per_cpu(theSchedBuf, cpu)[per_cpu(theSchedSel, cpu)])
return 0;
local_irq_save(flags);
schedBuf = per_cpu(theSchedBuf, cpu)[per_cpu(theSchedSel, cpu)];
schedPos = per_cpu(theSchedPos, cpu);
per_cpu(theSchedSel, cpu) = !per_cpu(theSchedSel, cpu);
per_cpu(theSchedPos, cpu) = 0;
per_cpu(theSchedErr, cpu) = 0;
local_irq_restore(flags);
// find mm and replace with cookies
for (i = 0; i < schedPos; i += 6) {
uint32_t cookie = schedBuf[i+3];
if (cookie) {
struct task_struct *task = (struct task_struct *)cookie;
schedBuf[i+3] = get_exec_cookie(cpu, task);
}
}
// timer/end event
schedBuf[schedPos++] = SCHED_TIMER_EVENT;
schedBuf[schedPos++] = (int)time;
schedBuf[schedPos++] = (int)(time >> 32);
if (buffer)
*buffer = schedBuf;
return schedPos;
}
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