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Subject[patch 35/37] LTTng instrumentation kernel
Core kernel events.

*not* present in this patch because they are architecture specific :
- syscall entry/exit
- traps
- kernel thread creation

Added markers :

kernel_irq_entry
kernel_irq_exit
kernel_kthread_stop
kernel_kthread_stop_ret
kernel_module_free
kernel_module_load
kernel_printk
kernel_process_exit
kernel_process_fork
kernel_process_free
kernel_process_wait
kernel_sched_migrate_task
kernel_sched_schedule
kernel_sched_try_wakeup
kernel_sched_wait_task
kernel_sched_wakeup_new_task
kernel_send_signal
kernel_softirq_entry
kernel_softirq_exit
kernel_softirq_raise
kernel_tasklet_high_entry
kernel_tasklet_high_exit
kernel_tasklet_low_entry
kernel_tasklet_low_exit
kernel_timer_itimer_expired
kernel_timer_itimer_set
kernel_timer_set
kernel_timer_timeout
kernel_timer_update_time
kernel_vprintk
locking_hardirqs_off
locking_hardirqs_on
locking_lock_acquire
locking_lock_release
locking_softirqs_off
locking_softirqs_on

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---
kernel/exit.c | 8 ++++++++
kernel/fork.c | 5 +++++
kernel/irq/handle.c | 7 +++++++
kernel/itimer.c | 13 +++++++++++++
kernel/kthread.c | 5 +++++
kernel/lockdep.c | 20 ++++++++++++++++++++
kernel/module.c | 5 +++++
kernel/printk.c | 27 +++++++++++++++++++++++++++
kernel/sched.c | 5 +++++
kernel/signal.c | 3 +++
kernel/softirq.c | 23 +++++++++++++++++++++++
kernel/timer.c | 13 ++++++++++++-
12 files changed, 133 insertions(+), 1 deletion(-)
Index: linux-2.6-sched-devel/kernel/irq/handle.c
===================================================================
--- linux-2.6-sched-devel.orig/kernel/irq/handle.c 2008-04-24 11:00:47.000000000 -0400
+++ linux-2.6-sched-devel/kernel/irq/handle.c 2008-04-24 11:00:49.000000000 -0400
@@ -15,6 +15,7 @@
#include <linux/random.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
+#include <linux/marker.h>

#include "internals.h"

@@ -130,6 +131,10 @@ irqreturn_t handle_IRQ_event(unsigned in
{
irqreturn_t ret, retval = IRQ_NONE;
unsigned int status = 0;
+ struct pt_regs *regs = get_irq_regs();
+
+ trace_mark(kernel_irq_entry, "irq_id %u kernel_mode %u", irq,
+ (regs)?(!user_mode(regs)):(1));

handle_dynamic_tick(action);

@@ -148,6 +153,8 @@ irqreturn_t handle_IRQ_event(unsigned in
add_interrupt_randomness(irq);
local_irq_disable();

+ trace_mark(kernel_irq_exit, MARK_NOARGS);
+
return retval;
}

Index: linux-2.6-sched-devel/kernel/itimer.c
===================================================================
--- linux-2.6-sched-devel.orig/kernel/itimer.c 2008-04-24 11:00:47.000000000 -0400
+++ linux-2.6-sched-devel/kernel/itimer.c 2008-04-24 11:00:49.000000000 -0400
@@ -12,6 +12,7 @@
#include <linux/time.h>
#include <linux/posix-timers.h>
#include <linux/hrtimer.h>
+#include <linux/marker.h>

#include <asm/uaccess.h>

@@ -132,6 +133,9 @@ enum hrtimer_restart it_real_fn(struct h
struct signal_struct *sig =
container_of(timer, struct signal_struct, real_timer);

+ trace_mark(kernel_timer_itimer_expired, "pid %d",
+ pid_nr(sig->leader_pid));
+
kill_pid_info(SIGALRM, SEND_SIG_PRIV, sig->leader_pid);

return HRTIMER_NORESTART;
@@ -157,6 +161,15 @@ int do_setitimer(int which, struct itime
!timeval_valid(&value->it_interval))
return -EINVAL;

+ trace_mark(kernel_timer_itimer_set,
+ "which %d interval_sec %ld interval_usec %ld "
+ "value_sec %ld value_usec %ld",
+ which,
+ value->it_interval.tv_sec,
+ value->it_interval.tv_usec,
+ value->it_value.tv_sec,
+ value->it_value.tv_usec);
+
switch (which) {
case ITIMER_REAL:
again:
Index: linux-2.6-sched-devel/kernel/kthread.c
===================================================================
--- linux-2.6-sched-devel.orig/kernel/kthread.c 2008-04-24 11:00:47.000000000 -0400
+++ linux-2.6-sched-devel/kernel/kthread.c 2008-04-24 11:00:49.000000000 -0400
@@ -15,6 +15,7 @@
#include <linux/mutex.h>
#include <linux/cpumask.h>
#include <linux/cpuset.h>
+#include <linux/marker.h>

#define KTHREAD_NICE_LEVEL (-5)

@@ -207,6 +208,8 @@ int kthread_stop(struct task_struct *k)
/* It could exit after stop_info.k set, but before wake_up_process. */
get_task_struct(k);

+ trace_mark(kernel_kthread_stop, "pid %d", k->pid);
+
/* Must init completion *before* thread sees kthread_stop_info.k */
init_completion(&kthread_stop_info.done);
smp_wmb();
@@ -222,6 +225,8 @@ int kthread_stop(struct task_struct *k)
ret = kthread_stop_info.err;
mutex_unlock(&kthread_stop_lock);

+ trace_mark(kernel_kthread_stop_ret, "ret %d", ret);
+
return ret;
}
EXPORT_SYMBOL(kthread_stop);
Index: linux-2.6-sched-devel/kernel/lockdep.c
===================================================================
--- linux-2.6-sched-devel.orig/kernel/lockdep.c 2008-04-24 11:00:47.000000000 -0400
+++ linux-2.6-sched-devel/kernel/lockdep.c 2008-04-24 11:00:49.000000000 -0400
@@ -40,6 +40,7 @@
#include <linux/utsname.h>
#include <linux/hash.h>
#include <linux/ftrace.h>
+#include <linux/marker.h>

#include <asm/sections.h>

@@ -2024,6 +2025,9 @@ void trace_hardirqs_on_caller(unsigned l

time_hardirqs_on(CALLER_ADDR0, a0);

+ _trace_mark(locking_hardirqs_on, "ip #p%lu",
+ (unsigned long) __builtin_return_address(0));
+
if (unlikely(!debug_locks || current->lockdep_recursion))
return;

@@ -2078,6 +2082,9 @@ void trace_hardirqs_off_caller(unsigned

time_hardirqs_off(CALLER_ADDR0, a0);

+ _trace_mark(locking_hardirqs_off, "ip #p%lu",
+ (unsigned long) __builtin_return_address(0));
+
if (unlikely(!debug_locks || current->lockdep_recursion))
return;

@@ -2110,6 +2117,9 @@ void trace_softirqs_on(unsigned long ip)
{
struct task_struct *curr = current;

+ _trace_mark(locking_softirqs_on, "ip #p%lu",
+ (unsigned long) __builtin_return_address(0));
+
if (unlikely(!debug_locks))
return;

@@ -2144,6 +2154,9 @@ void trace_softirqs_off(unsigned long ip
{
struct task_struct *curr = current;

+ _trace_mark(locking_softirqs_off, "ip #p%lu",
+ (unsigned long) __builtin_return_address(0));
+
if (unlikely(!debug_locks))
return;

@@ -2376,6 +2389,10 @@ static int __lock_acquire(struct lockdep
int chain_head = 0;
u64 chain_key;

+ _trace_mark(locking_lock_acquire,
+ "ip #p%lu subclass %u lock %p trylock %d",
+ ip, subclass, lock, trylock);
+
if (!prove_locking)
check = 1;

@@ -2649,6 +2666,9 @@ __lock_release(struct lockdep_map *lock,
{
struct task_struct *curr = current;

+ _trace_mark(locking_lock_release, "ip #p%lu lock %p nested %d",
+ ip, lock, nested);
+
if (!check_unlock(curr, lock, ip))
return;

Index: linux-2.6-sched-devel/kernel/printk.c
===================================================================
--- linux-2.6-sched-devel.orig/kernel/printk.c 2008-04-24 11:00:47.000000000 -0400
+++ linux-2.6-sched-devel/kernel/printk.c 2008-04-24 11:00:49.000000000 -0400
@@ -32,6 +32,7 @@
#include <linux/security.h>
#include <linux/bootmem.h>
#include <linux/syscalls.h>
+#include <linux/marker.h>

#include <asm/uaccess.h>

@@ -607,6 +608,7 @@ asmlinkage int printk(const char *fmt, .
int r;

va_start(args, fmt);
+ trace_mark(kernel_printk, "ip %p", __builtin_return_address(0));
r = vprintk(fmt, args);
va_end(args);

@@ -683,6 +685,31 @@ asmlinkage int vprintk(const char *fmt,
raw_local_irq_save(flags);
this_cpu = smp_processor_id();

+ if (printed_len > 0) {
+ unsigned int loglevel;
+ int mark_len;
+ char *mark_buf;
+ char saved_char;
+
+ if (printk_buf[0] == '<' && printk_buf[1] >= '0' &&
+ printk_buf[1] <= '7' && printk_buf[2] == '>') {
+ loglevel = printk_buf[1] - '0';
+ mark_buf = &printk_buf[3];
+ mark_len = printed_len - 3;
+ } else {
+ loglevel = default_message_loglevel;
+ mark_buf = printk_buf;
+ mark_len = printed_len;
+ }
+ if (mark_buf[mark_len - 1] == '\n')
+ mark_len--;
+ saved_char = mark_buf[mark_len];
+ mark_buf[mark_len] = '\0';
+ _trace_mark(kernel_vprintk, "loglevel %c string %s ip %p",
+ loglevel, mark_buf, __builtin_return_address(0));
+ mark_buf[mark_len] = saved_char;
+ }
+
/*
* Ouch, printk recursed into itself!
*/
Index: linux-2.6-sched-devel/kernel/sched.c
===================================================================
--- linux-2.6-sched-devel.orig/kernel/sched.c 2008-04-24 11:00:47.000000000 -0400
+++ linux-2.6-sched-devel/kernel/sched.c 2008-04-24 11:00:49.000000000 -0400
@@ -71,6 +71,7 @@
#include <linux/debugfs.h>
#include <linux/ctype.h>
#include <linux/ftrace.h>
+#include <linux/marker.h>

#include <asm/tlb.h>
#include <asm/irq_regs.h>
@@ -2275,6 +2276,8 @@ void wait_task_inactive(struct task_stru
* just go back and repeat.
*/
rq = task_rq_lock(p, &flags);
+ trace_mark(kernel_sched_wait_task, "pid %d state %ld",
+ p->pid, p->state);
running = task_running(rq, p);
on_rq = p->se.on_rq;
task_rq_unlock(rq, &flags);
@@ -3163,6 +3166,8 @@ static void sched_migrate_task(struct ta
|| unlikely(cpu_is_offline(dest_cpu)))
goto out;

+ trace_mark(kernel_sched_migrate_task, "pid %d state %ld dest_cpu %d",
+ p->pid, p->state, dest_cpu);
/* force the process onto the specified CPU */
if (migrate_task(p, dest_cpu, &req)) {
/* Need to wait for migration thread (might exit: take ref). */
Index: linux-2.6-sched-devel/kernel/signal.c
===================================================================
--- linux-2.6-sched-devel.orig/kernel/signal.c 2008-04-24 11:00:47.000000000 -0400
+++ linux-2.6-sched-devel/kernel/signal.c 2008-04-24 11:00:49.000000000 -0400
@@ -26,6 +26,7 @@
#include <linux/freezer.h>
#include <linux/pid_namespace.h>
#include <linux/nsproxy.h>
+#include <linux/marker.h>

#include <asm/param.h>
#include <asm/uaccess.h>
@@ -663,6 +664,8 @@ static int send_signal(int sig, struct s
struct sigqueue * q = NULL;
int ret = 0;

+ trace_mark(kernel_send_signal, "pid %d signal %d", t->pid, sig);
+
/*
* Deliver the signal to listening signalfds. This must be called
* with the sighand lock held.
Index: linux-2.6-sched-devel/kernel/softirq.c
===================================================================
--- linux-2.6-sched-devel.orig/kernel/softirq.c 2008-04-24 11:00:47.000000000 -0400
+++ linux-2.6-sched-devel/kernel/softirq.c 2008-04-24 11:00:49.000000000 -0400
@@ -21,6 +21,7 @@
#include <linux/rcupdate.h>
#include <linux/smp.h>
#include <linux/tick.h>
+#include <linux/marker.h>

#include <asm/irq.h>
/*
@@ -231,7 +232,15 @@ restart:

do {
if (pending & 1) {
+ trace_mark(kernel_softirq_entry, "softirq_id %lu",
+ ((unsigned long)h
+ - (unsigned long)softirq_vec)
+ / sizeof(*h));
h->action(h);
+ trace_mark(kernel_softirq_exit, "softirq_id %lu",
+ ((unsigned long)h
+ - (unsigned long)softirq_vec)
+ / sizeof(*h));
rcu_bh_qsctr_inc(cpu);
}
h++;
@@ -323,6 +332,8 @@ void irq_exit(void)
*/
inline void raise_softirq_irqoff(unsigned int nr)
{
+ trace_mark(kernel_softirq_raise, "softirq_id %u", nr);
+
__raise_softirq_irqoff(nr);

/*
@@ -412,7 +423,13 @@ static void tasklet_action(struct softir
if (!atomic_read(&t->count)) {
if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
BUG();
+ trace_mark(kernel_tasklet_low_entry,
+ "func %p data %lu",
+ t->func, t->data);
t->func(t->data);
+ trace_mark(kernel_tasklet_low_exit,
+ "func %p data %lu",
+ t->func, t->data);
tasklet_unlock(t);
continue;
}
@@ -447,7 +464,13 @@ static void tasklet_hi_action(struct sof
if (!atomic_read(&t->count)) {
if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
BUG();
+ trace_mark(kernel_tasklet_high_entry,
+ "func %p data %lu",
+ t->func, t->data);
t->func(t->data);
+ trace_mark(kernel_tasklet_high_exit,
+ "func %p data %lu",
+ t->func, t->data);
tasklet_unlock(t);
continue;
}
Index: linux-2.6-sched-devel/kernel/timer.c
===================================================================
--- linux-2.6-sched-devel.orig/kernel/timer.c 2008-04-24 11:00:47.000000000 -0400
+++ linux-2.6-sched-devel/kernel/timer.c 2008-04-24 11:00:49.000000000 -0400
@@ -37,12 +37,14 @@
#include <linux/delay.h>
#include <linux/tick.h>
#include <linux/kallsyms.h>
+#include <linux/marker.h>

#include <asm/uaccess.h>
#include <asm/unistd.h>
#include <asm/div64.h>
#include <asm/timex.h>
#include <asm/io.h>
+#include <asm/irq_regs.h>

u64 jiffies_64 __cacheline_aligned_in_smp = INITIAL_JIFFIES;

@@ -288,6 +290,8 @@ static void internal_add_timer(struct tv
i = (expires >> (TVR_BITS + 3 * TVN_BITS)) & TVN_MASK;
vec = base->tv5.vec + i;
}
+ trace_mark(kernel_timer_set, "expires %lu function %p data %lu",
+ expires, timer->function, timer->data);
/*
* Timers are FIFO:
*/
@@ -940,6 +944,11 @@ void do_timer(unsigned long ticks)
{
jiffies_64 += ticks;
update_times(ticks);
+ trace_mark(kernel_timer_update_time,
+ "jiffies #8u%llu xtime_sec %ld xtime_nsec %ld "
+ "walltomonotonic_sec %ld walltomonotonic_nsec %ld",
+ (unsigned long long)jiffies_64, xtime.tv_sec, xtime.tv_nsec,
+ wall_to_monotonic.tv_sec, wall_to_monotonic.tv_nsec);
}

#ifdef __ARCH_WANT_SYS_ALARM
@@ -1021,7 +1030,9 @@ asmlinkage long sys_getegid(void)

static void process_timeout(unsigned long __data)
{
- wake_up_process((struct task_struct *)__data);
+ struct task_struct *task = (struct task_struct *)__data;
+ trace_mark(kernel_timer_timeout, "pid %d", task->pid);
+ wake_up_process(task);
}

/**
Index: linux-2.6-sched-devel/kernel/exit.c
===================================================================
--- linux-2.6-sched-devel.orig/kernel/exit.c 2008-04-24 11:00:47.000000000 -0400
+++ linux-2.6-sched-devel/kernel/exit.c 2008-04-24 11:01:06.000000000 -0400
@@ -44,6 +44,7 @@
#include <linux/resource.h>
#include <linux/blkdev.h>
#include <linux/task_io_accounting_ops.h>
+#include <linux/marker.h>

#include <asm/uaccess.h>
#include <asm/unistd.h>
@@ -137,6 +138,8 @@ static void __exit_signal(struct task_st

static void delayed_put_task_struct(struct rcu_head *rhp)
{
+ trace_mark(kernel_process_free, "pid %d",
+ container_of(rhp, struct task_struct, rcu)->pid);
put_task_struct(container_of(rhp, struct task_struct, rcu));
}

@@ -951,6 +954,9 @@ NORET_TYPE void do_exit(long code)

if (group_dead)
acct_process();
+
+ trace_mark(kernel_process_exit, "pid %d", tsk->pid);
+
exit_sem(tsk);
exit_files(tsk);
exit_fs(tsk);
@@ -1435,6 +1441,8 @@ static long do_wait(enum pid_type type,
struct task_struct *tsk;
int flag, retval;

+ trace_mark(kernel_process_wait, "pid %d", pid_nr(pid));
+
add_wait_queue(&current->signal->wait_chldexit,&wait);
repeat:
/* If there is nothing that can match our critier just get out */
Index: linux-2.6-sched-devel/kernel/fork.c
===================================================================
--- linux-2.6-sched-devel.orig/kernel/fork.c 2008-04-24 11:00:47.000000000 -0400
+++ linux-2.6-sched-devel/kernel/fork.c 2008-04-24 11:00:49.000000000 -0400
@@ -54,6 +54,7 @@
#include <linux/proc_fs.h>
#include <linux/blkdev.h>
#include <linux/magic.h>
+#include <linux/marker.h>

#include <asm/pgtable.h>
#include <asm/pgalloc.h>
@@ -1516,6 +1517,10 @@ long do_fork(unsigned long clone_flags,
if (!IS_ERR(p)) {
struct completion vfork;

+ trace_mark(kernel_process_fork,
+ "parent_pid %d child_pid %d child_tgid %d",
+ current->pid, p->pid, p->tgid);
+
nr = task_pid_vnr(p);

if (clone_flags & CLONE_PARENT_SETTID)
Index: linux-2.6-sched-devel/kernel/module.c
===================================================================
--- linux-2.6-sched-devel.orig/kernel/module.c 2008-04-24 11:00:47.000000000 -0400
+++ linux-2.6-sched-devel/kernel/module.c 2008-04-24 11:00:49.000000000 -0400
@@ -47,6 +47,7 @@
#include <asm/cacheflush.h>
#include <linux/license.h>
#include <asm/sections.h>
+#include <linux/marker.h>

#if 0
#define DEBUGP printk
@@ -1332,6 +1333,8 @@ static int __unlink_module(void *_mod)
/* Free a module, remove from lists, etc (must hold module_mutex). */
static void free_module(struct module *mod)
{
+ trace_mark(kernel_module_free, "name %s", mod->name);
+
/* Delete from various lists */
stop_machine_run(__unlink_module, mod, NR_CPUS);
remove_notes_attrs(mod);
@@ -2117,6 +2120,8 @@ static struct module *load_module(void _
/* Get rid of temporary copy */
vfree(hdr);

+ trace_mark(kernel_module_load, "name %s", mod->name);
+
/* Done! */
return mod;

--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68


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