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ftrace: cleanups 

factor out code and clean it up.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2008-05-12 21:20:45 +02:00 committed by Thomas Gleixner
parent 60a11774b3
commit c7aafc5497
7 changed files with 136 additions and 105 deletions
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2
include/linux/ftrace.h
View File

@ -69,7 +69,7 @@ extern void ftrace_caller(void);
extern void ftrace_call(void);
extern void mcount_call(void);
#else
# define ftrace_force_update() do { } while (0)
# define ftrace_force_update() ({ 0; })
#endif
static inline void tracer_disable(void)

124
kernel/trace/trace.c
View File

@ -142,12 +142,59 @@ __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
tracing_record_cmdline(current);
}
void check_pages(struct trace_array_cpu *data)
{
struct page *page, *tmp;
BUG_ON(data->trace_pages.next->prev != &data->trace_pages);
BUG_ON(data->trace_pages.prev->next != &data->trace_pages);
list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) {
BUG_ON(page->lru.next->prev != &page->lru);
BUG_ON(page->lru.prev->next != &page->lru);
}
}
void *head_page(struct trace_array_cpu *data)
{
struct page *page;
check_pages(data);
if (list_empty(&data->trace_pages))
return NULL;
page = list_entry(data->trace_pages.next, struct page, lru);
BUG_ON(&page->lru == &data->trace_pages);
return page_address(page);
}
notrace static void
flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2)
{
struct list_head flip_pages;
INIT_LIST_HEAD(&flip_pages);
tr1->trace_current = NULL;
memcpy(&tr1->trace_current_idx, &tr2->trace_current_idx,
sizeof(struct trace_array_cpu) -
offsetof(struct trace_array_cpu, trace_current_idx));
check_pages(tr1);
check_pages(tr2);
list_splice_init(&tr1->trace_pages, &flip_pages);
list_splice_init(&tr2->trace_pages, &tr1->trace_pages);
list_splice_init(&flip_pages, &tr2->trace_pages);
BUG_ON(!list_empty(&flip_pages));
check_pages(tr1);
check_pages(tr2);
}
notrace void
update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
struct trace_array_cpu *data;
void *save_trace;
struct list_head save_pages;
int i;
WARN_ON_ONCE(!irqs_disabled());
@ -155,11 +202,7 @@ update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
/* clear out all the previous traces */
for_each_possible_cpu(i) {
data = tr->data[i];
save_trace = max_tr.data[i]->trace;
save_pages = max_tr.data[i]->trace_pages;
memcpy(max_tr.data[i], data, sizeof(*data));
data->trace = save_trace;
data->trace_pages = save_pages;
flip_trace(max_tr.data[i], data);
tracing_reset(data);
}
@ -177,8 +220,6 @@ notrace void
update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
struct trace_array_cpu *data = tr->data[cpu];
void *save_trace;
struct list_head save_pages;
int i;
WARN_ON_ONCE(!irqs_disabled());
@ -186,11 +227,8 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
for_each_possible_cpu(i)
tracing_reset(max_tr.data[i]);
save_trace = max_tr.data[cpu]->trace;
save_pages = max_tr.data[cpu]->trace_pages;
memcpy(max_tr.data[cpu], data, sizeof(*data));
data->trace = save_trace;
data->trace_pages = save_pages;
flip_trace(max_tr.data[cpu], data);
tracing_reset(data);
__update_max_tr(tr, tsk, cpu);
@ -234,9 +272,9 @@ int register_tracer(struct tracer *type)
* If we fail, we do not register this tracer.
*/
for_each_possible_cpu(i) {
if (!data->trace)
continue;
data = tr->data[i];
if (!head_page(data))
continue;
tracing_reset(data);
}
current_trace = type;
@ -298,7 +336,7 @@ void unregister_tracer(struct tracer *type)
void notrace tracing_reset(struct trace_array_cpu *data)
{
data->trace_idx = 0;
data->trace_current = data->trace;
data->trace_current = head_page(data);
data->trace_current_idx = 0;
}
@ -425,26 +463,31 @@ notrace void tracing_record_cmdline(struct task_struct *tsk)
}
static inline notrace struct trace_entry *
tracing_get_trace_entry(struct trace_array *tr,
struct trace_array_cpu *data)
tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data)
{
unsigned long idx, idx_next;
struct trace_entry *entry;
struct page *page;
struct list_head *next;
struct page *page;
data->trace_idx++;
idx = data->trace_current_idx;
idx_next = idx + 1;
BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE);
entry = data->trace_current + idx * TRACE_ENTRY_SIZE;
if (unlikely(idx_next >= ENTRIES_PER_PAGE)) {
page = virt_to_page(data->trace_current);
if (unlikely(&page->lru == data->trace_pages.prev))
next = data->trace_pages.next;
else
/*
* Roundrobin - but skip the head (which is not a real page):
*/
next = page->lru.next;
if (unlikely(next == &data->trace_pages))
next = next->next;
BUG_ON(next == &data->trace_pages);
page = list_entry(next, struct page, lru);
data->trace_current = page_address(page);
idx_next = 0;
@ -456,8 +499,7 @@ tracing_get_trace_entry(struct trace_array *tr,
}
static inline notrace void
tracing_generic_entry_update(struct trace_entry *entry,
unsigned long flags)
tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags)
{
struct task_struct *tsk = current;
unsigned long pc;
@ -476,8 +518,7 @@ tracing_generic_entry_update(struct trace_entry *entry,
notrace void
ftrace(struct trace_array *tr, struct trace_array_cpu *data,
unsigned long ip, unsigned long parent_ip,
unsigned long flags)
unsigned long ip, unsigned long parent_ip, unsigned long flags)
{
struct trace_entry *entry;
@ -540,6 +581,8 @@ trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data,
}
page = list_entry(iter->next_page[cpu], struct page, lru);
BUG_ON(&data->trace_pages == &page->lru);
array = page_address(page);
return &array[iter->next_page_idx[cpu]];
@ -554,7 +597,7 @@ find_next_entry(struct trace_iterator *iter, int *ent_cpu)
int cpu;
for_each_possible_cpu(cpu) {
if (!tr->data[cpu]->trace)
if (!head_page(tr->data[cpu]))
continue;
ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu);
if (ent &&
@ -762,7 +805,7 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter)
name = type->name;
for_each_possible_cpu(cpu) {
if (tr->data[cpu]->trace) {
if (head_page(tr->data[cpu])) {
total += tr->data[cpu]->trace_idx;
if (tr->data[cpu]->trace_idx > tr->entries)
entries += tr->entries;
@ -975,8 +1018,7 @@ static int trace_empty(struct trace_iterator *iter)
for_each_possible_cpu(cpu) {
data = iter->tr->data[cpu];
if (data->trace &&
data->trace_idx)
if (head_page(data) && data->trace_idx)
return 0;
}
return 1;
@ -1576,9 +1618,9 @@ static struct tracer no_tracer __read_mostly =
static int trace_alloc_page(void)
{
struct trace_array_cpu *data;
void *array;
struct page *page, *tmp;
LIST_HEAD(pages);
void *array;
int i;
/* first allocate a page for each CPU */
@ -1610,14 +1652,14 @@ static int trace_alloc_page(void)
for_each_possible_cpu(i) {
data = global_trace.data[i];
page = list_entry(pages.next, struct page, lru);
list_del(&page->lru);
list_del_init(&page->lru);
list_add_tail(&page->lru, &data->trace_pages);
ClearPageLRU(page);
#ifdef CONFIG_TRACER_MAX_TRACE
data = max_tr.data[i];
page = list_entry(pages.next, struct page, lru);
list_del(&page->lru);
list_del_init(&page->lru);
list_add_tail(&page->lru, &data->trace_pages);
SetPageLRU(page);
#endif
@ -1628,7 +1670,7 @@ static int trace_alloc_page(void)
free_pages:
list_for_each_entry_safe(page, tmp, &pages, lru) {
list_del(&page->lru);
list_del_init(&page->lru);
__free_page(page);
}
return -ENOMEM;
@ -1654,7 +1696,6 @@ __init static int tracer_alloc_buffers(void)
"for trace buffer!\n");
goto free_buffers;
}
data->trace = array;
/* set the array to the list */
INIT_LIST_HEAD(&data->trace_pages);
@ -1671,7 +1712,6 @@ __init static int tracer_alloc_buffers(void)
"for trace buffer!\n");
goto free_buffers;
}
max_tr.data[i]->trace = array;
INIT_LIST_HEAD(&max_tr.data[i]->trace_pages);
page = virt_to_page(array);
@ -1716,24 +1756,22 @@ __init static int tracer_alloc_buffers(void)
struct page *page, *tmp;
struct trace_array_cpu *data = global_trace.data[i];
if (data && data->trace) {
if (data) {
list_for_each_entry_safe(page, tmp,
&data->trace_pages, lru) {
list_del(&page->lru);
list_del_init(&page->lru);
__free_page(page);
}
data->trace = NULL;
}
#ifdef CONFIG_TRACER_MAX_TRACE
data = max_tr.data[i];
if (data && data->trace) {
if (data) {
list_for_each_entry_safe(page, tmp,
&data->trace_pages, lru) {
list_del(&page->lru);
list_del_init(&page->lru);
__free_page(page);
}
data->trace = NULL;
}
#endif
}

8
kernel/trace/trace.h
View File

@ -53,12 +53,12 @@ struct trace_entry {
* the trace, etc.)
*/
struct trace_array_cpu {
void *trace;
void *trace_current;
unsigned trace_current_idx;
struct list_head trace_pages;
unsigned long trace_idx;
atomic_t disabled;
/* these fields get copied into max-trace: */
unsigned trace_current_idx;
unsigned long trace_idx;
unsigned long saved_latency;
unsigned long critical_start;
unsigned long critical_end;
@ -216,4 +216,6 @@ extern int trace_selftest_startup_sched_switch(struct tracer *trace,
#endif
#endif /* CONFIG_FTRACE_STARTUP_TEST */
extern void *head_page(struct trace_array_cpu *data);
#endif /* _LINUX_KERNEL_TRACE_H */

36
kernel/trace/trace_irqsoff.c
View File

@ -144,7 +144,7 @@ check_critical_timing(struct trace_array *tr,
if (!report_latency(delta))
goto out;
spin_lock(&max_trace_lock);
spin_lock_irqsave(&max_trace_lock, flags);
/* check if we are still the max latency */
if (!report_latency(delta))
@ -165,32 +165,24 @@ check_critical_timing(struct trace_array *tr,
update_max_tr_single(tr, current, cpu);
if (tracing_thresh)
printk(KERN_INFO "(%16s-%-5d|#%d): %lu us critical section "
"violates %lu us threshold.\n"
" => started at timestamp %lu: ",
current->comm, current->pid,
raw_smp_processor_id(),
latency, nsecs_to_usecs(tracing_thresh), t0);
else
if (tracing_thresh) {
printk(KERN_INFO "(%16s-%-5d|#%d):"
" new %lu us maximum-latency "
"critical section.\n => started at timestamp %lu: ",
" %lu us critical section violates %lu us threshold.\n",
current->comm, current->pid,
raw_smp_processor_id(),
latency, t0);
print_symbol(KERN_CONT "<%s>\n", data->critical_start);
printk(KERN_CONT " => ended at timestamp %lu: ", t1);
print_symbol(KERN_CONT "<%s>\n", data->critical_end);
dump_stack();
t1 = nsecs_to_usecs(now(cpu));
printk(KERN_CONT " => dump-end timestamp %lu\n\n", t1);
latency, nsecs_to_usecs(tracing_thresh));
} else {
printk(KERN_INFO "(%16s-%-5d|#%d):"
" new %lu us maximum-latency critical section.\n",
current->comm, current->pid,
raw_smp_processor_id(),
latency);
}
max_sequence++;
out_unlock:
spin_unlock(&max_trace_lock);
spin_unlock_irqrestore(&max_trace_lock, flags);
out:
data->critical_sequence = max_sequence;
@ -216,7 +208,7 @@ start_critical_timing(unsigned long ip, unsigned long parent_ip)
cpu = raw_smp_processor_id();
data = tr->data[cpu];
if (unlikely(!data) || unlikely(!data->trace) ||
if (unlikely(!data) || unlikely(!head_page(data)) ||
atomic_read(&data->disabled))
return;
@ -256,7 +248,7 @@ stop_critical_timing(unsigned long ip, unsigned long parent_ip)
cpu = raw_smp_processor_id();
data = tr->data[cpu];
if (unlikely(!data) || unlikely(!data->trace) ||
if (unlikely(!data) || unlikely(!head_page(data)) ||
!data->critical_start || atomic_read(&data->disabled))
return;

18
kernel/trace/trace_sched_wakeup.c
View File

@ -107,24 +107,18 @@ wakeup_sched_switch(struct task_struct *prev, struct task_struct *next)
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"
" => started at timestamp %lu: ",
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), t0);
latency, nsecs_to_usecs(tracing_thresh));
} else {
printk(KERN_INFO "(%16s-%-5d|#%d): new %lu us maximum "
"wakeup latency.\n => started at timestamp %lu: ",
printk(KERN_INFO "(%16s-%-5d|#%d):"
" new %lu us maximum wakeup latency.\n",
wakeup_task->comm, wakeup_task->pid,
cpu, latency, t0);
cpu, latency);
}
printk(KERN_CONT " ended at timestamp %lu: ", t1);
dump_stack();
t1 = nsecs_to_usecs(now(cpu));
printk(KERN_CONT " dump-end timestamp %lu\n\n", t1);
out_unlock:
__wakeup_reset(tr);
spin_unlock_irqrestore(&wakeup_lock, flags);

25
kernel/trace/trace_selftest.c
View File

@ -1,6 +1,7 @@
/* Include in trace.c */
#include <linux/kthread.h>
#include <linux/delay.h>
static inline int trace_valid_entry(struct trace_entry *entry)
{
@ -15,28 +16,29 @@ static inline int trace_valid_entry(struct trace_entry *entry)
static int
trace_test_buffer_cpu(struct trace_array *tr, struct trace_array_cpu *data)
{
struct page *page;
struct trace_entry *entries;
struct page *page;
int idx = 0;
int i;
BUG_ON(list_empty(&data->trace_pages));
page = list_entry(data->trace_pages.next, struct page, lru);
entries = page_address(page);
if (data->trace != entries)
if (head_page(data) != entries)
goto failed;
/*
* The starting trace buffer always has valid elements,
* if any element exits.
* if any element exists.
*/
entries = data->trace;
entries = head_page(data);
for (i = 0; i < tr->entries; i++) {
if (i < data->trace_idx &&
!trace_valid_entry(&entries[idx])) {
printk(KERN_CONT ".. invalid entry %d ", entries[idx].type);
if (i < data->trace_idx && !trace_valid_entry(&entries[idx])) {
printk(KERN_CONT ".. invalid entry %d ",
entries[idx].type);
goto failed;
}
@ -80,11 +82,10 @@ static int trace_test_buffer(struct trace_array *tr, unsigned long *count)
int ret = 0;
for_each_possible_cpu(cpu) {
if (!tr->data[cpu]->trace)
if (!head_page(tr->data[cpu]))
continue;
cnt += tr->data[cpu]->trace_idx;
printk("%d: count = %ld\n", cpu, cnt);
ret = trace_test_buffer_cpu(tr, tr->data[cpu]);
if (ret)
@ -117,6 +118,8 @@ trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr)
}
/* start the tracing */
ftrace_enabled = 1;
tr->ctrl = 1;
trace->init(tr);
/* Sleep for a 1/10 of a second */
@ -124,6 +127,8 @@ trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr)
/* stop the tracing. */
tr->ctrl = 0;
trace->ctrl_update(tr);
ftrace_enabled = 0;
/* check the trace buffer */
ret = trace_test_buffer(tr, &count);
trace->reset(tr);
@ -328,7 +333,7 @@ trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr)
/* create a high prio thread */
p = kthread_run(trace_wakeup_test_thread, &isrt, "ftrace-test");
if (!IS_ERR(p)) {
if (IS_ERR(p)) {
printk(KERN_CONT "Failed to create ftrace wakeup test thread ");
return -1;
}