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Merge branch 'tip/perf/core' of git://github.com/rostedt/linux into perf/core

This commit is contained in:
Ingo Molnar 2011-10-12 17:14:47 +02:00
parent 177e2163fe d696b58ca2
commit 910e94dd0c
17 changed files with 930 additions and 481 deletions
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2
arch/x86/kernel/jump_label.c
View File

@ -42,7 +42,7 @@ void arch_jump_label_transform(struct jump_entry *entry,
put_online_cpus();
}
void arch_jump_label_text_poke_early(jump_label_t addr)
void __init_or_module arch_jump_label_text_poke_early(jump_label_t addr)
{
text_poke_early((void *)addr, ideal_nops[NOP_ATOMIC5],
JUMP_LABEL_NOP_SIZE);

12
include/linux/module.h
View File

@ -580,9 +580,6 @@ int unregister_module_notifier(struct notifier_block * nb);
extern void print_modules(void);
extern void module_update_tracepoints(void);
extern int module_get_iter_tracepoints(struct tracepoint_iter *iter);
#else /* !CONFIG_MODULES... */
#define EXPORT_SYMBOL(sym)
#define EXPORT_SYMBOL_GPL(sym)
@ -698,15 +695,6 @@ static inline int unregister_module_notifier(struct notifier_block * nb)
static inline void print_modules(void)
{
}
static inline void module_update_tracepoints(void)
{
}
static inline int module_get_iter_tracepoints(struct tracepoint_iter *iter)
{
return 0;
}
#endif /* CONFIG_MODULES */
#ifdef CONFIG_SYSFS

2
include/linux/ring_buffer.h
View File

@ -154,6 +154,8 @@ void ring_buffer_record_enable(struct ring_buffer *buffer);
void ring_buffer_record_disable_cpu(struct ring_buffer *buffer, int cpu);
void ring_buffer_record_enable_cpu(struct ring_buffer *buffer, int cpu);
unsigned long ring_buffer_oldest_event_ts(struct ring_buffer *buffer, int cpu);
unsigned long ring_buffer_bytes_cpu(struct ring_buffer *buffer, int cpu);
unsigned long ring_buffer_entries(struct ring_buffer *buffer);
unsigned long ring_buffer_overruns(struct ring_buffer *buffer);
unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu);

1
include/linux/trace_clock.h
View File

@ -15,5 +15,6 @@
extern u64 notrace trace_clock_local(void);
extern u64 notrace trace_clock(void);
extern u64 notrace trace_clock_global(void);
extern u64 notrace trace_clock_counter(void);
#endif /* _LINUX_TRACE_CLOCK_H */

25
include/linux/tracepoint.h
View File

@ -54,8 +54,18 @@ extern int tracepoint_probe_unregister_noupdate(const char *name, void *probe,
void *data);
extern void tracepoint_probe_update_all(void);
#ifdef CONFIG_MODULES
struct tp_module {
struct list_head list;
unsigned int num_tracepoints;
struct tracepoint * const *tracepoints_ptrs;
};
#endif /* CONFIG_MODULES */
struct tracepoint_iter {
struct module *module;
#ifdef CONFIG_MODULES
struct tp_module *module;
#endif /* CONFIG_MODULES */
struct tracepoint * const *tracepoint;
};
@ -63,8 +73,6 @@ extern void tracepoint_iter_start(struct tracepoint_iter *iter);
extern void tracepoint_iter_next(struct tracepoint_iter *iter);
extern void tracepoint_iter_stop(struct tracepoint_iter *iter);
extern void tracepoint_iter_reset(struct tracepoint_iter *iter);
extern int tracepoint_get_iter_range(struct tracepoint * const **tracepoint,
struct tracepoint * const *begin, struct tracepoint * const *end);
/*
* tracepoint_synchronize_unregister must be called between the last tracepoint
@ -78,17 +86,6 @@ static inline void tracepoint_synchronize_unregister(void)
#define PARAMS(args...) args
#ifdef CONFIG_TRACEPOINTS
extern
void tracepoint_update_probe_range(struct tracepoint * const *begin,
struct tracepoint * const *end);
#else
static inline
void tracepoint_update_probe_range(struct tracepoint * const *begin,
struct tracepoint * const *end)
{ }
#endif /* CONFIG_TRACEPOINTS */
#endif /* _LINUX_TRACEPOINT_H */
/*

47
kernel/module.c
View File

@ -3487,50 +3487,3 @@ void module_layout(struct module *mod,
}
EXPORT_SYMBOL(module_layout);
#endif
#ifdef CONFIG_TRACEPOINTS
void module_update_tracepoints(void)
{
struct module *mod;
mutex_lock(&module_mutex);
list_for_each_entry(mod, &modules, list)
if (!mod->taints)
tracepoint_update_probe_range(mod->tracepoints_ptrs,
mod->tracepoints_ptrs + mod->num_tracepoints);
mutex_unlock(&module_mutex);
}
/*
* Returns 0 if current not found.
* Returns 1 if current found.
*/
int module_get_iter_tracepoints(struct tracepoint_iter *iter)
{
struct module *iter_mod;
int found = 0;
mutex_lock(&module_mutex);
list_for_each_entry(iter_mod, &modules, list) {
if (!iter_mod->taints) {
/*
* Sorted module list
*/
if (iter_mod < iter->module)
continue;
else if (iter_mod > iter->module)
iter->tracepoint = NULL;
found = tracepoint_get_iter_range(&iter->tracepoint,
iter_mod->tracepoints_ptrs,
iter_mod->tracepoints_ptrs
+ iter_mod->num_tracepoints);
if (found) {
iter->module = iter_mod;
break;
}
}
}
mutex_unlock(&module_mutex);
return found;
}
#endif

2
kernel/trace/Makefile
View File

@ -15,6 +15,8 @@ ifdef CONFIG_TRACING_BRANCHES
KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
endif
CFLAGS_trace_events_filter.o := -I$(src)
#
# Make the trace clocks available generally: it's infrastructure
# relied on by ptrace for example:

8
kernel/trace/ftrace.c
View File

@ -3862,6 +3862,14 @@ void ftrace_kill(void)
clear_ftrace_function();
}
/**
* Test if ftrace is dead or not.
*/
int ftrace_is_dead(void)
{
return ftrace_disabled;
}
/**
* register_ftrace_function - register a function for profiling
* @ops - ops structure that holds the function for profiling.

70
kernel/trace/ring_buffer.c
View File

@ -488,12 +488,14 @@ struct ring_buffer_per_cpu {
struct buffer_page *reader_page;
unsigned long lost_events;
unsigned long last_overrun;
local_t entries_bytes;
local_t commit_overrun;
local_t overrun;
local_t entries;
local_t committing;
local_t commits;
unsigned long read;
unsigned long read_bytes;
u64 write_stamp;
u64 read_stamp;
};
@ -1708,6 +1710,7 @@ rb_handle_head_page(struct ring_buffer_per_cpu *cpu_buffer,
* the counters.
*/
local_add(entries, &cpu_buffer->overrun);
local_sub(BUF_PAGE_SIZE, &cpu_buffer->entries_bytes);
/*
* The entries will be zeroed out when we move the
@ -1863,6 +1866,9 @@ rb_reset_tail(struct ring_buffer_per_cpu *cpu_buffer,
event = __rb_page_index(tail_page, tail);
kmemcheck_annotate_bitfield(event, bitfield);
/* account for padding bytes */
local_add(BUF_PAGE_SIZE - tail, &cpu_buffer->entries_bytes);
/*
* Save the original length to the meta data.
* This will be used by the reader to add lost event
@ -2054,6 +2060,9 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
if (!tail)
tail_page->page->time_stamp = ts;
/* account for these added bytes */
local_add(length, &cpu_buffer->entries_bytes);
return event;
}
@ -2076,6 +2085,7 @@ rb_try_to_discard(struct ring_buffer_per_cpu *cpu_buffer,
if (bpage->page == (void *)addr && rb_page_write(bpage) == old_index) {
unsigned long write_mask =
local_read(&bpage->write) & ~RB_WRITE_MASK;
unsigned long event_length = rb_event_length(event);
/*
* This is on the tail page. It is possible that
* a write could come in and move the tail page
@ -2085,8 +2095,11 @@ rb_try_to_discard(struct ring_buffer_per_cpu *cpu_buffer,
old_index += write_mask;
new_index += write_mask;
index = local_cmpxchg(&bpage->write, old_index, new_index);
if (index == old_index)
if (index == old_index) {
/* update counters */
local_sub(event_length, &cpu_buffer->entries_bytes);
return 1;
}
}
/* could not discard */
@ -2660,6 +2673,58 @@ rb_num_of_entries(struct ring_buffer_per_cpu *cpu_buffer)
(local_read(&cpu_buffer->overrun) + cpu_buffer->read);
}
/**
* ring_buffer_oldest_event_ts - get the oldest event timestamp from the buffer
* @buffer: The ring buffer
* @cpu: The per CPU buffer to read from.
*/
unsigned long ring_buffer_oldest_event_ts(struct ring_buffer *buffer, int cpu)
{
unsigned long flags;
struct ring_buffer_per_cpu *cpu_buffer;
struct buffer_page *bpage;
unsigned long ret;
if (!cpumask_test_cpu(cpu, buffer->cpumask))
return 0;
cpu_buffer = buffer->buffers[cpu];
spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
/*
* if the tail is on reader_page, oldest time stamp is on the reader
* page
*/
if (cpu_buffer->tail_page == cpu_buffer->reader_page)
bpage = cpu_buffer->reader_page;
else
bpage = rb_set_head_page(cpu_buffer);
ret = bpage->page->time_stamp;
spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(ring_buffer_oldest_event_ts);
/**
* ring_buffer_bytes_cpu - get the number of bytes consumed in a cpu buffer
* @buffer: The ring buffer
* @cpu: The per CPU buffer to read from.
*/
unsigned long ring_buffer_bytes_cpu(struct ring_buffer *buffer, int cpu)
{
struct ring_buffer_per_cpu *cpu_buffer;
unsigned long ret;
if (!cpumask_test_cpu(cpu, buffer->cpumask))
return 0;
cpu_buffer = buffer->buffers[cpu];
ret = local_read(&cpu_buffer->entries_bytes) - cpu_buffer->read_bytes;
return ret;
}
EXPORT_SYMBOL_GPL(ring_buffer_bytes_cpu);
/**
* ring_buffer_entries_cpu - get the number of entries in a cpu buffer
* @buffer: The ring buffer
@ -3527,11 +3592,13 @@ rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
cpu_buffer->reader_page->read = 0;
local_set(&cpu_buffer->commit_overrun, 0);
local_set(&cpu_buffer->entries_bytes, 0);
local_set(&cpu_buffer->overrun, 0);
local_set(&cpu_buffer->entries, 0);
local_set(&cpu_buffer->committing, 0);
local_set(&cpu_buffer->commits, 0);
cpu_buffer->read = 0;
cpu_buffer->read_bytes = 0;
cpu_buffer->write_stamp = 0;
cpu_buffer->read_stamp = 0;
@ -3918,6 +3985,7 @@ int ring_buffer_read_page(struct ring_buffer *buffer,
} else {
/* update the entry counter */
cpu_buffer->read += rb_page_entries(reader);
cpu_buffer->read_bytes += BUF_PAGE_SIZE;
/* swap the pages */
rb_init_page(bpage);

175
kernel/trace/trace.c
View File

@ -435,6 +435,7 @@ static struct {
} trace_clocks[] = {
{ trace_clock_local, "local" },
{ trace_clock_global, "global" },
{ trace_clock_counter, "counter" },
};
int trace_clock_id;
@ -2159,6 +2160,14 @@ void trace_default_header(struct seq_file *m)
}
}
static void test_ftrace_alive(struct seq_file *m)
{
if (!ftrace_is_dead())
return;
seq_printf(m, "# WARNING: FUNCTION TRACING IS CORRUPTED\n");
seq_printf(m, "# MAY BE MISSING FUNCTION EVENTS\n");
}
static int s_show(struct seq_file *m, void *v)
{
struct trace_iterator *iter = v;
@ -2168,6 +2177,7 @@ static int s_show(struct seq_file *m, void *v)
if (iter->tr) {
seq_printf(m, "# tracer: %s\n", iter->trace->name);
seq_puts(m, "#\n");
test_ftrace_alive(m);
}
if (iter->trace && iter->trace->print_header)
iter->trace->print_header(m);
@ -3568,6 +3578,30 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
return cnt;
}
static ssize_t
tracing_total_entries_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
struct trace_array *tr = filp->private_data;
char buf[64];
int r, cpu;
unsigned long size = 0, expanded_size = 0;
mutex_lock(&trace_types_lock);
for_each_tracing_cpu(cpu) {
size += tr->entries >> 10;
if (!ring_buffer_expanded)
expanded_size += trace_buf_size >> 10;
}
if (ring_buffer_expanded)
r = sprintf(buf, "%lu\n", size);
else
r = sprintf(buf, "%lu (expanded: %lu)\n", size, expanded_size);
mutex_unlock(&trace_types_lock);
return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}
static ssize_t
tracing_free_buffer_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
@ -3594,22 +3628,24 @@ tracing_free_buffer_release(struct inode *inode, struct file *filp)
return 0;
}
static int mark_printk(const char *fmt, ...)
{
int ret;
va_list args;
va_start(args, fmt);
ret = trace_vprintk(0, fmt, args);
va_end(args);
return ret;
}
static ssize_t
tracing_mark_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *fpos)
{
char *buf;
size_t written;
unsigned long addr = (unsigned long)ubuf;
struct ring_buffer_event *event;
struct ring_buffer *buffer;
struct print_entry *entry;
unsigned long irq_flags;
struct page *pages[2];
int nr_pages = 1;
ssize_t written;
void *page1;
void *page2;
int offset;
int size;
int len;
int ret;
if (tracing_disabled)
return -EINVAL;
@ -3617,28 +3653,81 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
if (cnt > TRACE_BUF_SIZE)
cnt = TRACE_BUF_SIZE;
buf = kmalloc(cnt + 2, GFP_KERNEL);
if (buf == NULL)
return -ENOMEM;
/*
* Userspace is injecting traces into the kernel trace buffer.
* We want to be as non intrusive as possible.
* To do so, we do not want to allocate any special buffers
* or take any locks, but instead write the userspace data
* straight into the ring buffer.
*
* First we need to pin the userspace buffer into memory,
* which, most likely it is, because it just referenced it.
* But there's no guarantee that it is. By using get_user_pages_fast()
* and kmap_atomic/kunmap_atomic() we can get access to the
* pages directly. We then write the data directly into the
* ring buffer.
*/
BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE);
if (copy_from_user(buf, ubuf, cnt)) {
kfree(buf);
return -EFAULT;
/* check if we cross pages */
if ((addr & PAGE_MASK) != ((addr + cnt) & PAGE_MASK))
nr_pages = 2;
offset = addr & (PAGE_SIZE - 1);
addr &= PAGE_MASK;
ret = get_user_pages_fast(addr, nr_pages, 0, pages);
if (ret < nr_pages) {
while (--ret >= 0)
put_page(pages[ret]);
written = -EFAULT;
goto out;
}
if (buf[cnt-1] != '\n') {
buf[cnt] = '\n';
buf[cnt+1] = '\0';
} else
buf[cnt] = '\0';
written = mark_printk("%s", buf);
kfree(buf);
page1 = kmap_atomic(pages[0]);
if (nr_pages == 2)
page2 = kmap_atomic(pages[1]);
local_save_flags(irq_flags);
size = sizeof(*entry) + cnt + 2; /* possible \n added */
buffer = global_trace.buffer;
event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size,
irq_flags, preempt_count());
if (!event) {
/* Ring buffer disabled, return as if not open for write */
written = -EBADF;
goto out_unlock;
}
entry = ring_buffer_event_data(event);
entry->ip = _THIS_IP_;
if (nr_pages == 2) {
len = PAGE_SIZE - offset;
memcpy(&entry->buf, page1 + offset, len);
memcpy(&entry->buf[len], page2, cnt - len);
} else
memcpy(&entry->buf, page1 + offset, cnt);
if (entry->buf[cnt - 1] != '\n') {
entry->buf[cnt] = '\n';
entry->buf[cnt + 1] = '\0';
} else
entry->buf[cnt] = '\0';
ring_buffer_unlock_commit(buffer, event);
written = cnt;
*fpos += written;
/* don't tell userspace we wrote more - it might confuse them */
if (written > cnt)
written = cnt;
out_unlock:
if (nr_pages == 2)
kunmap_atomic(page2);
kunmap_atomic(page1);
while (nr_pages > 0)
put_page(pages[--nr_pages]);
out:
return written;
}
@ -3739,6 +3828,12 @@ static const struct file_operations tracing_entries_fops = {
.llseek = generic_file_llseek,
};
static const struct file_operations tracing_total_entries_fops = {
.open = tracing_open_generic,
.read = tracing_total_entries_read,
.llseek = generic_file_llseek,
};
static const struct file_operations tracing_free_buffer_fops = {
.write = tracing_free_buffer_write,
.release = tracing_free_buffer_release,
@ -4026,6 +4121,8 @@ tracing_stats_read(struct file *filp, char __user *ubuf,
struct trace_array *tr = &global_trace;
struct trace_seq *s;
unsigned long cnt;
unsigned long long t;
unsigned long usec_rem;
s = kmalloc(sizeof(*s), GFP_KERNEL);
if (!s)
@ -4042,6 +4139,17 @@ tracing_stats_read(struct file *filp, char __user *ubuf,
cnt = ring_buffer_commit_overrun_cpu(tr->buffer, cpu);
trace_seq_printf(s, "commit overrun: %ld\n", cnt);
cnt = ring_buffer_bytes_cpu(tr->buffer, cpu);
trace_seq_printf(s, "bytes: %ld\n", cnt);
t = ns2usecs(ring_buffer_oldest_event_ts(tr->buffer, cpu));
usec_rem = do_div(t, USEC_PER_SEC);
trace_seq_printf(s, "oldest event ts: %5llu.%06lu\n", t, usec_rem);
t = ns2usecs(ring_buffer_time_stamp(tr->buffer, cpu));
usec_rem = do_div(t, USEC_PER_SEC);
trace_seq_printf(s, "now ts: %5llu.%06lu\n", t, usec_rem);
count = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len);
kfree(s);
@ -4450,6 +4558,9 @@ static __init int tracer_init_debugfs(void)
trace_create_file("buffer_size_kb", 0644, d_tracer,
&global_trace, &tracing_entries_fops);
trace_create_file("buffer_total_size_kb", 0444, d_tracer,
&global_trace, &tracing_total_entries_fops);
trace_create_file("free_buffer", 0644, d_tracer,
&global_trace, &tracing_free_buffer_fops);
@ -4566,6 +4677,12 @@ __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode)
tracing_off();
/* Did function tracer already get disabled? */
if (ftrace_is_dead()) {
printk("# WARNING: FUNCTION TRACING IS CORRUPTED\n");
printk("# MAY BE MISSING FUNCTION EVENTS\n");
}
if (disable_tracing)
ftrace_kill();

16
kernel/trace/trace.h
View File

@ -579,11 +579,13 @@ static inline int ftrace_trace_task(struct task_struct *task)
return test_tsk_trace_trace(task);
}
extern int ftrace_is_dead(void);
#else
static inline int ftrace_trace_task(struct task_struct *task)
{
return 1;
}
static inline int ftrace_is_dead(void) { return 0; }
#endif
/*
@ -761,16 +763,10 @@ struct filter_pred {
filter_pred_fn_t fn;
u64 val;
struct regex regex;
/*
* Leaf nodes use field_name, ops is used by AND and OR
* nodes. The field_name is always freed when freeing a pred.
* We can overload field_name for ops and have it freed
* as well.
*/
union {
char *field_name;
unsigned short *ops;
};
unsigned short *ops;
#ifdef CONFIG_FTRACE_STARTUP_TEST
struct ftrace_event_field *field;
#endif
int offset;
int not;
int op;

12
kernel/trace/trace_clock.c
View File

@ -113,3 +113,15 @@ u64 notrace trace_clock_global(void)
return now;
}
static atomic64_t trace_counter;
/*
* trace_clock_counter(): simply an atomic counter.
* Use the trace_counter "counter" for cases where you do not care
* about timings, but are interested in strict ordering.
*/
u64 notrace trace_clock_counter(void)
{
return atomic64_add_return(1, &trace_counter);
}

797
kernel/trace/trace_events_filter.c
View File

@ -381,6 +381,63 @@ get_pred_parent(struct filter_pred *pred, struct filter_pred *preds,
return pred;
}
enum walk_return {
WALK_PRED_ABORT,
WALK_PRED_PARENT,
WALK_PRED_DEFAULT,
};
typedef int (*filter_pred_walkcb_t) (enum move_type move,
struct filter_pred *pred,
int *err, void *data);
static int walk_pred_tree(struct filter_pred *preds,
struct filter_pred *root,
filter_pred_walkcb_t cb, void *data)
{
struct filter_pred *pred = root;
enum move_type move = MOVE_DOWN;
int done = 0;
if (!preds)
return -EINVAL;
do {
int err = 0, ret;
ret = cb(move, pred, &err, data);
if (ret == WALK_PRED_ABORT)
return err;
if (ret == WALK_PRED_PARENT)
goto get_parent;
switch (move) {
case MOVE_DOWN:
if (pred->left != FILTER_PRED_INVALID) {
pred = &preds[pred->left];
continue;
}
goto get_parent;
case MOVE_UP_FROM_LEFT:
pred = &preds[pred->right];
move = MOVE_DOWN;
continue;
case MOVE_UP_FROM_RIGHT:
get_parent:
if (pred == root)
break;
pred = get_pred_parent(pred, preds,
pred->parent,
&move);
continue;
}
done = 1;
} while (!done);
/* We are fine. */
return 0;
}
/*
* A series of AND or ORs where found together. Instead of
* climbing up and down the tree branches, an array of the
@ -410,99 +467,91 @@ static int process_ops(struct filter_pred *preds,
for (i = 0; i < op->val; i++) {
pred = &preds[op->ops[i]];
match = pred->fn(pred, rec);
if (!WARN_ON_ONCE(!pred->fn))
match = pred->fn(pred, rec);
if (!!match == type)
return match;
}
return match;
}
struct filter_match_preds_data {
struct filter_pred *preds;
int match;
void *rec;
};
static int filter_match_preds_cb(enum move_type move, struct filter_pred *pred,
int *err, void *data)
{
struct filter_match_preds_data *d = data;
*err = 0;
switch (move) {
case MOVE_DOWN:
/* only AND and OR have children */
if (pred->left != FILTER_PRED_INVALID) {
/* If ops is set, then it was folded. */
if (!pred->ops)
return WALK_PRED_DEFAULT;
/* We can treat folded ops as a leaf node */
d->match = process_ops(d->preds, pred, d->rec);
} else {
if (!WARN_ON_ONCE(!pred->fn))
d->match = pred->fn(pred, d->rec);
}
return WALK_PRED_PARENT;
case MOVE_UP_FROM_LEFT:
/*
* Check for short circuits.
*
* Optimization: !!match == (pred->op == OP_OR)
* is the same as:
* if ((match && pred->op == OP_OR) ||
* (!match && pred->op == OP_AND))
*/
if (!!d->match == (pred->op == OP_OR))
return WALK_PRED_PARENT;
break;
case MOVE_UP_FROM_RIGHT:
break;
}
return WALK_PRED_DEFAULT;
}
/* return 1 if event matches, 0 otherwise (discard) */
int filter_match_preds(struct event_filter *filter, void *rec)
{
int match = -1;
enum move_type move = MOVE_DOWN;
struct filter_pred *preds;
struct filter_pred *pred;
struct filter_pred *root;
int n_preds;
int done = 0;
struct filter_match_preds_data data = {
/* match is currently meaningless */
.match = -1,
.rec = rec,
};
int n_preds, ret;
/* no filter is considered a match */
if (!filter)
return 1;
n_preds = filter->n_preds;
if (!n_preds)
return 1;
/*
* n_preds, root and filter->preds are protect with preemption disabled.
*/
preds = rcu_dereference_sched(filter->preds);
root = rcu_dereference_sched(filter->root);
if (!root)
return 1;
pred = root;
/* match is currently meaningless */
match = -1;
do {
switch (move) {
case MOVE_DOWN:
/* only AND and OR have children */
if (pred->left != FILTER_PRED_INVALID) {
/* If ops is set, then it was folded. */
if (!pred->ops) {
/* keep going to down the left side */
pred = &preds[pred->left];
continue;
}
/* We can treat folded ops as a leaf node */
match = process_ops(preds, pred, rec);
} else
match = pred->fn(pred, rec);
/* If this pred is the only pred */
if (pred == root)
break;
pred = get_pred_parent(pred, preds,
pred->parent, &move);
continue;
case MOVE_UP_FROM_LEFT:
/*
* Check for short circuits.
*
* Optimization: !!match == (pred->op == OP_OR)
* is the same as:
* if ((match && pred->op == OP_OR) ||
* (!match && pred->op == OP_AND))
*/
if (!!match == (pred->op == OP_OR)) {
if (pred == root)
break;
pred = get_pred_parent(pred, preds,
pred->parent, &move);
continue;
}
/* now go down the right side of the tree. */
pred = &preds[pred->right];
move = MOVE_DOWN;
continue;
case MOVE_UP_FROM_RIGHT:
/* We finished this equation. */
if (pred == root)
break;
pred = get_pred_parent(pred, preds,
pred->parent, &move);
continue;
}
done = 1;
} while (!done);
return match;
data.preds = preds = rcu_dereference_sched(filter->preds);
ret = walk_pred_tree(preds, root, filter_match_preds_cb, &data);
WARN_ON(ret);
return data.match;
}
EXPORT_SYMBOL_GPL(filter_match_preds);
@ -628,22 +677,6 @@ find_event_field(struct ftrace_event_call *call, char *name)
return __find_event_field(head, name);
}
static void filter_free_pred(struct filter_pred *pred)
{
if (!pred)
return;
kfree(pred->field_name);
kfree(pred);
}
static void filter_clear_pred(struct filter_pred *pred)
{
kfree(pred->field_name);
pred->field_name = NULL;
pred->regex.len = 0;
}
static int __alloc_pred_stack(struct pred_stack *stack, int n_preds)
{
stack->preds = kzalloc(sizeof(*stack->preds)*(n_preds + 1), GFP_KERNEL);
@ -689,20 +722,13 @@ __pop_pred_stack(struct pred_stack *stack)
static int filter_set_pred(struct event_filter *filter,
int idx,
struct pred_stack *stack,
struct filter_pred *src,
filter_pred_fn_t fn)
struct filter_pred *src)
{
struct filter_pred *dest = &filter->preds[idx];
struct filter_pred *left;
struct filter_pred *right;
*dest = *src;
if (src->field_name) {
dest->field_name = kstrdup(src->field_name, GFP_KERNEL);
if (!dest->field_name)
return -ENOMEM;
}
dest->fn = fn;
dest->index = idx;
if (dest->op == OP_OR || dest->op == OP_AND) {
@ -743,11 +769,7 @@ static int filter_set_pred(struct event_filter *filter,
static void __free_preds(struct event_filter *filter)
{
int i;
if (filter->preds) {
for (i = 0; i < filter->a_preds; i++)
kfree(filter->preds[i].field_name);
kfree(filter->preds);
filter->preds = NULL;
}
@ -840,23 +862,19 @@ static void filter_free_subsystem_filters(struct event_subsystem *system)
}
}
static int filter_add_pred_fn(struct filter_parse_state *ps,
struct ftrace_event_call *call,
struct event_filter *filter,
struct filter_pred *pred,
struct pred_stack *stack,
filter_pred_fn_t fn)
static int filter_add_pred(struct filter_parse_state *ps,
struct event_filter *filter,
struct filter_pred *pred,
struct pred_stack *stack)
{
int idx, err;
int err;
if (WARN_ON(filter->n_preds == filter->a_preds)) {
parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0);
return -ENOSPC;
}
idx = filter->n_preds;
filter_clear_pred(&filter->preds[idx]);
err = filter_set_pred(filter, idx, stack, pred, fn);
err = filter_set_pred(filter, filter->n_preds, stack, pred);
if (err)
return err;
@ -937,31 +955,15 @@ static filter_pred_fn_t select_comparison_fn(int op, int field_size,
return fn;
}
static int filter_add_pred(struct filter_parse_state *ps,
struct ftrace_event_call *call,
struct event_filter *filter,
struct filter_pred *pred,
struct pred_stack *stack,
bool dry_run)
static int init_pred(struct filter_parse_state *ps,
struct ftrace_event_field *field,
struct filter_pred *pred)
{
struct ftrace_event_field *field;
filter_pred_fn_t fn;
filter_pred_fn_t fn = filter_pred_none;
unsigned long long val;
int ret;
fn = pred->fn = filter_pred_none;
if (pred->op == OP_AND)
goto add_pred_fn;
else if (pred->op == OP_OR)
goto add_pred_fn;
field = find_event_field(call, pred->field_name);
if (!field) {
parse_error(ps, FILT_ERR_FIELD_NOT_FOUND, 0);
return -EINVAL;
}
pred->offset = field->offset;
if (!is_legal_op(field, pred->op)) {
@ -1001,9 +1003,7 @@ static int filter_add_pred(struct filter_parse_state *ps,
if (pred->op == OP_NE)
pred->not = 1;
add_pred_fn:
if (!dry_run)
return filter_add_pred_fn(ps, call, filter, pred, stack, fn);
pred->fn = fn;
return 0;
}
@ -1302,39 +1302,37 @@ parse_operand:
return 0;
}
static struct filter_pred *create_pred(int op, char *operand1, char *operand2)
static struct filter_pred *create_pred(struct filter_parse_state *ps,
struct ftrace_event_call *call,
int op, char *operand1, char *operand2)
{
struct filter_pred *pred;
struct ftrace_event_field *field;
static struct filter_pred pred;
pred = kzalloc(sizeof(*pred), GFP_KERNEL);
if (!pred)
return NULL;
memset(&pred, 0, sizeof(pred));
pred.op = op;
pred->field_name = kstrdup(operand1, GFP_KERNEL);
if (!pred->field_name) {
kfree(pred);
if (op == OP_AND || op == OP_OR)
return &pred;
if (!operand1 || !operand2) {
parse_error(ps, FILT_ERR_MISSING_FIELD, 0);
return NULL;
}
strcpy(pred->regex.pattern, operand2);
pred->regex.len = strlen(pred->regex.pattern);
pred->op = op;
return pred;
}
static struct filter_pred *create_logical_pred(int op)
{
struct filter_pred *pred;
pred = kzalloc(sizeof(*pred), GFP_KERNEL);
if (!pred)
field = find_event_field(call, operand1);
if (!field) {
parse_error(ps, FILT_ERR_FIELD_NOT_FOUND, 0);
return NULL;
}
pred->op = op;
strcpy(pred.regex.pattern, operand2);
pred.regex.len = strlen(pred.regex.pattern);
return pred;
#ifdef CONFIG_FTRACE_STARTUP_TEST
pred.field = field;
#endif
return init_pred(ps, field, &pred) ? NULL : &pred;
}
static int check_preds(struct filter_parse_state *ps)
@ -1375,6 +1373,23 @@ static int count_preds(struct filter_parse_state *ps)
return n_preds;
}
struct check_pred_data {
int count;
int max;
};
static int check_pred_tree_cb(enum move_type move, struct filter_pred *pred,
int *err, void *data)
{
struct check_pred_data *d = data;
if (WARN_ON(d->count++ > d->max)) {
*err = -EINVAL;
return WALK_PRED_ABORT;
}
return WALK_PRED_DEFAULT;
}
/*
* The tree is walked at filtering of an event. If the tree is not correctly
* built, it may cause an infinite loop. Check here that the tree does
@ -1383,107 +1398,76 @@ static int count_preds(struct filter_parse_state *ps)
static int check_pred_tree(struct event_filter *filter,
struct filter_pred *root)
{
struct filter_pred *preds;
struct filter_pred *pred;
enum move_type move = MOVE_DOWN;
int count = 0;
int done = 0;
int max;
struct check_pred_data data = {
/*
* The max that we can hit a node is three times.
* Once going down, once coming up from left, and
* once coming up from right. This is more than enough
* since leafs are only hit a single time.
*/
.max = 3 * filter->n_preds,
.count = 0,
};
/*
* The max that we can hit a node is three times.
* Once going down, once coming up from left, and
* once coming up from right. This is more than enough
* since leafs are only hit a single time.
*/
max = 3 * filter->n_preds;
return walk_pred_tree(filter->preds, root,
check_pred_tree_cb, &data);
}
preds = filter->preds;
if (!preds)
return -EINVAL;
pred = root;
static int count_leafs_cb(enum move_type move, struct filter_pred *pred,
int *err, void *data)
{
int *count = data;
do {
if (WARN_ON(count++ > max))
return -EINVAL;
if ((move == MOVE_DOWN) &&
(pred->left == FILTER_PRED_INVALID))
(*count)++;
switch (move) {
case MOVE_DOWN:
if (pred->left != FILTER_PRED_INVALID) {
pred = &preds[pred->left];
continue;
}
/* A leaf at the root is just a leaf in the tree */
if (pred == root)
break;
pred = get_pred_parent(pred, preds,
pred->parent, &move);
continue;
case MOVE_UP_FROM_LEFT:
pred = &preds[pred->right];
move = MOVE_DOWN;
continue;
case MOVE_UP_FROM_RIGHT:
if (pred == root)
break;
pred = get_pred_parent(pred, preds,
pred->parent, &move);
continue;
}
done = 1;
} while (!done);
/* We are fine. */
return 0;
return WALK_PRED_DEFAULT;
}
static int count_leafs(struct filter_pred *preds, struct filter_pred *root)
{
struct filter_pred *pred;
enum move_type move = MOVE_DOWN;
int count = 0;
int done = 0;
pred = root;
do {
switch (move) {
case MOVE_DOWN:
if (pred->left != FILTER_PRED_INVALID) {
pred = &preds[pred->left];
continue;
}
/* A leaf at the root is just a leaf in the tree */
if (pred == root)
return 1;
count++;
pred = get_pred_parent(pred, preds,
pred->parent, &move);
continue;
case MOVE_UP_FROM_LEFT:
pred = &preds[pred->right];
move = MOVE_DOWN;
continue;
case MOVE_UP_FROM_RIGHT:
if (pred == root)
break;
pred = get_pred_parent(pred, preds,
pred->parent, &move);
continue;
}
done = 1;
} while (!done);
int count = 0, ret;
ret = walk_pred_tree(preds, root, count_leafs_cb, &count);
WARN_ON(ret);
return count;
}
struct fold_pred_data {
struct filter_pred *root;
int count;
int children;
};
static int fold_pred_cb(enum move_type move, struct filter_pred *pred,
int *err, void *data)
{
struct fold_pred_data *d = data;
struct filter_pred *root = d->root;
if (move != MOVE_DOWN)
return WALK_PRED_DEFAULT;
if (pred->left != FILTER_PRED_INVALID)
return WALK_PRED_DEFAULT;
if (WARN_ON(d->count == d->children)) {
*err = -EINVAL;
return WALK_PRED_ABORT;
}
pred->index &= ~FILTER_PRED_FOLD;
root->ops[d->count++] = pred->index;
return WALK_PRED_DEFAULT;
}
static int fold_pred(struct filter_pred *preds, struct filter_pred *root)
{
struct filter_pred *pred;
enum move_type move = MOVE_DOWN;
int count = 0;
struct fold_pred_data data = {
.root = root,
.count = 0,
};
int children;
int done = 0;
/* No need to keep the fold flag */
root->index &= ~FILTER_PRED_FOLD;
@ -1501,37 +1485,26 @@ static int fold_pred(struct filter_pred *preds, struct filter_pred *root)
return -ENOMEM;
root->val = children;
data.children = children;
return walk_pred_tree(preds, root, fold_pred_cb, &data);
}
pred = root;
do {
switch (move) {
case MOVE_DOWN:
if (pred->left != FILTER_PRED_INVALID) {
pred = &preds[pred->left];
continue;
}
if (WARN_ON(count == children))
return -EINVAL;
pred->index &= ~FILTER_PRED_FOLD;
root->ops[count++] = pred->index;
pred = get_pred_parent(pred, preds,
pred->parent, &move);
continue;
case MOVE_UP_FROM_LEFT:
pred = &preds[pred->right];
move = MOVE_DOWN;
continue;
case MOVE_UP_FROM_RIGHT:
if (pred == root)
break;
pred = get_pred_parent(pred, preds,
pred->parent, &move);
continue;
}
done = 1;
} while (!done);
static int fold_pred_tree_cb(enum move_type move, struct filter_pred *pred,
int *err, void *data)
{
struct filter_pred *preds = data;
return 0;
if (move != MOVE_DOWN)
return WALK_PRED_DEFAULT;
if (!(pred->index & FILTER_PRED_FOLD))
return WALK_PRED_DEFAULT;
*err = fold_pred(preds, pred);
if (*err)
return WALK_PRED_ABORT;
/* eveyrhing below is folded, continue with parent */
return WALK_PRED_PARENT;
}
/*
@ -1542,51 +1515,8 @@ static int fold_pred(struct filter_pred *preds, struct filter_pred *root)
static int fold_pred_tree(struct event_filter *filter,
struct filter_pred *root)
{
struct filter_pred *preds;
struct filter_pred *pred;
enum move_type move = MOVE_DOWN;
int done = 0;
int err;
preds = filter->preds;
if (!preds)
return -EINVAL;
pred = root;
do {
switch (move) {
case MOVE_DOWN:
if (pred->index & FILTER_PRED_FOLD) {
err = fold_pred(preds, pred);
if (err)
return err;
/* Folded nodes are like leafs */
} else if (pred->left != FILTER_PRED_INVALID) {
pred = &preds[pred->left];
continue;
}
/* A leaf at the root is just a leaf in the tree */
if (pred == root)
break;
pred = get_pred_parent(pred, preds,
pred->parent, &move);
continue;
case MOVE_UP_FROM_LEFT:
pred = &preds[pred->right];
move = MOVE_DOWN;
continue;
case MOVE_UP_FROM_RIGHT:
if (pred == root)
break;
pred = get_pred_parent(pred, preds,
pred->parent, &move);
continue;
}
done = 1;
} while (!done);
return 0;
return walk_pred_tree(filter->preds, root, fold_pred_tree_cb,
filter->preds);
}
static int replace_preds(struct ftrace_event_call *call,
@ -1643,27 +1573,17 @@ static int replace_preds(struct ftrace_event_call *call,
goto fail;
}
if (elt->op == OP_AND || elt->op == OP_OR) {
pred = create_logical_pred(elt->op);
goto add_pred;
}
if (!operand1 || !operand2) {
parse_error(ps, FILT_ERR_MISSING_FIELD, 0);
pred = create_pred(ps, call, elt->op, operand1, operand2);
if (!pred) {
err = -EINVAL;
goto fail;
}
pred = create_pred(elt->op, operand1, operand2);
add_pred:
if (!pred) {
err = -ENOMEM;
goto fail;
if (!dry_run) {
err = filter_add_pred(ps, filter, pred, &stack);
if (err)
goto fail;
}
err = filter_add_pred(ps, call, filter, pred, &stack, dry_run);
filter_free_pred(pred);
if (err)
goto fail;
operand1 = operand2 = NULL;
}
@ -1958,17 +1878,14 @@ int ftrace_profile_set_filter(struct perf_event *event, int event_id,
int err;
struct event_filter *filter;
struct filter_parse_state *ps;
struct ftrace_event_call *call = NULL;
struct ftrace_event_call *call;
mutex_lock(&event_mutex);
list_for_each_entry(call, &ftrace_events, list) {
if (call->event.type == event_id)
break;
}
call = event->tp_event;
err = -EINVAL;
if (&call->list == &ftrace_events)
if (!call)
goto out_unlock;
err = -EEXIST;
@ -2012,3 +1929,215 @@ out_unlock:
#endif /* CONFIG_PERF_EVENTS */
#ifdef CONFIG_FTRACE_STARTUP_TEST
#include <linux/types.h>
#include <linux/tracepoint.h>
#define CREATE_TRACE_POINTS
#include "trace_events_filter_test.h"
static int test_get_filter(char *filter_str, struct ftrace_event_call *call,
struct event_filter **pfilter)
{
struct event_filter *filter;
struct filter_parse_state *ps;
int err = -ENOMEM;
filter = __alloc_filter();
if (!filter)
goto out;
ps = kzalloc(sizeof(*ps), GFP_KERNEL);
if (!ps)
goto free_filter;
parse_init(ps, filter_ops, filter_str);
err = filter_parse(ps);
if (err)
goto free_ps;
err = replace_preds(call, filter, ps, filter_str, false);
if (!err)
*pfilter = filter;
free_ps:
filter_opstack_clear(ps);
postfix_clear(ps);
kfree(ps);
free_filter:
if (err)
__free_filter(filter);
out:
return err;
}
#define DATA_REC(m, va, vb, vc, vd, ve, vf, vg, vh, nvisit) \
{ \
.filter = FILTER, \
.rec = { .a = va, .b = vb, .c = vc, .d = vd, \
.e = ve, .f = vf, .g = vg, .h = vh }, \
.match = m, \
.not_visited = nvisit, \
}
#define YES 1
#define NO 0
static struct test_filter_data_t {
char *filter;
struct ftrace_raw_ftrace_test_filter rec;
int match;
char *not_visited;
} test_filter_data[] = {
#define FILTER "a == 1 && b == 1 && c == 1 && d == 1 && " \
"e == 1 && f == 1 && g == 1 && h == 1"
DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, ""),
DATA_REC(NO, 0, 1, 1, 1, 1, 1, 1, 1, "bcdefgh"),
DATA_REC(NO, 1, 1, 1, 1, 1, 1, 1, 0, ""),
#undef FILTER
#define FILTER "a == 1 || b == 1 || c == 1 || d == 1 || " \
"e == 1 || f == 1 || g == 1 || h == 1"
DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 0, ""),
DATA_REC(YES, 0, 0, 0, 0, 0, 0, 0, 1, ""),
DATA_REC(YES, 1, 0, 0, 0, 0, 0, 0, 0, "bcdefgh"),
#undef FILTER
#define FILTER "(a == 1 || b == 1) && (c == 1 || d == 1) && " \
"(e == 1 || f == 1) && (g == 1 || h == 1)"
DATA_REC(NO, 0, 0, 1, 1, 1, 1, 1, 1, "dfh"),
DATA_REC(YES, 0, 1, 0, 1, 0, 1, 0, 1, ""),
DATA_REC(YES, 1, 0, 1, 0, 0, 1, 0, 1, "bd"),
DATA_REC(NO, 1, 0, 1, 0, 0, 1, 0, 0, "bd"),
#undef FILTER
#define FILTER "(a == 1 && b == 1) || (c == 1 && d == 1) || " \
"(e == 1 && f == 1) || (g == 1 && h == 1)"
DATA_REC(YES, 1, 0, 1, 1, 1, 1, 1, 1, "efgh"),
DATA_REC(YES, 0, 0, 0, 0, 0, 0, 1, 1, ""),
DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 1, ""),
#undef FILTER
#define FILTER "(a == 1 && b == 1) && (c == 1 && d == 1) && " \
"(e == 1 && f == 1) || (g == 1 && h == 1)"
DATA_REC(YES, 1, 1, 1, 1, 1, 1, 0, 0, "gh"),
DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 1, ""),
DATA_REC(YES, 1, 1, 1, 1, 1, 0, 1, 1, ""),
#undef FILTER
#define FILTER "((a == 1 || b == 1) || (c == 1 || d == 1) || " \
"(e == 1 || f == 1)) && (g == 1 || h == 1)"
DATA_REC(YES, 1, 1, 1, 1, 1, 1, 0, 1, "bcdef"),
DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 0, ""),
DATA_REC(YES, 1, 1, 1, 1, 1, 0, 1, 1, "h"),
#undef FILTER
#define FILTER "((((((((a == 1) && (b == 1)) || (c == 1)) && (d == 1)) || " \
"(e == 1)) && (f == 1)) || (g == 1)) && (h == 1))"
DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, "ceg"),
DATA_REC(NO, 0, 1, 0, 1, 0, 1, 0, 1, ""),
DATA_REC(NO, 1, 0, 1, 0, 1, 0, 1, 0, ""),
#undef FILTER
#define FILTER "((((((((a == 1) || (b == 1)) && (c == 1)) || (d == 1)) && " \
"(e == 1)) || (f == 1)) && (g == 1)) || (h == 1))"
DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, "bdfh"),
DATA_REC(YES, 0, 1, 0, 1, 0, 1, 0, 1, ""),
DATA_REC(YES, 1, 0, 1, 0, 1, 0, 1, 0, "bdfh"),
};
#undef DATA_REC
#undef FILTER
#undef YES
#undef NO
#define DATA_CNT (sizeof(test_filter_data)/sizeof(struct test_filter_data_t))
static int test_pred_visited;
static int test_pred_visited_fn(struct filter_pred *pred, void *event)
{
struct ftrace_event_field *field = pred->field;
test_pred_visited = 1;
printk(KERN_INFO "\npred visited %s\n", field->name);
return 1;
}
static int test_walk_pred_cb(enum move_type move, struct filter_pred *pred,
int *err, void *data)
{
char *fields = data;
if ((move == MOVE_DOWN) &&
(pred->left == FILTER_PRED_INVALID)) {
struct ftrace_event_field *field = pred->field;
if (!field) {
WARN(1, "all leafs should have field defined");
return WALK_PRED_DEFAULT;
}
if (!strchr(fields, *field->name))
return WALK_PRED_DEFAULT;
WARN_ON(!pred->fn);
pred->fn = test_pred_visited_fn;
}
return WALK_PRED_DEFAULT;
}
static __init int ftrace_test_event_filter(void)
{
int i;
printk(KERN_INFO "Testing ftrace filter: ");
for (i = 0; i < DATA_CNT; i++) {
struct event_filter *filter = NULL;
struct test_filter_data_t *d = &test_filter_data[i];
int err;
err = test_get_filter(d->filter, &event_ftrace_test_filter,
&filter);
if (err) {
printk(KERN_INFO
"Failed to get filter for '%s', err %d\n",
d->filter, err);
break;
}
/*
* The preemption disabling is not really needed for self
* tests, but the rcu dereference will complain without it.
*/
preempt_disable();
if (*d->not_visited)
walk_pred_tree(filter->preds, filter->root,
test_walk_pred_cb,
d->not_visited);
test_pred_visited = 0;
err = filter_match_preds(filter, &d->rec);
preempt_enable();
__free_filter(filter);
if (test_pred_visited) {
printk(KERN_INFO
"Failed, unwanted pred visited for filter %s\n",
d->filter);
break;
}
if (err != d->match) {
printk(KERN_INFO
"Failed to match filter '%s', expected %d\n",
d->filter, d->match);
break;
}
}
if (i == DATA_CNT)
printk(KERN_CONT "OK\n");
return 0;
}
late_initcall(ftrace_test_event_filter);
#endif /* CONFIG_FTRACE_STARTUP_TEST */

50
kernel/trace/trace_events_filter_test.h Normal file
View File

@ -0,0 +1,50 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM test
#if !defined(_TRACE_TEST_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_TEST_H
#include <linux/tracepoint.h>
TRACE_EVENT(ftrace_test_filter,
TP_PROTO(int a, int b, int c, int d, int e, int f, int g, int h),
TP_ARGS(a, b, c, d, e, f, g, h),
TP_STRUCT__entry(
__field(int, a)
__field(int, b)
__field(int, c)
__field(int, d)
__field(int, e)
__field(int, f)
__field(int, g)
__field(int, h)
),
TP_fast_assign(
__entry->a = a;
__entry->b = b;
__entry->c = c;
__entry->d = d;
__entry->e = e;
__entry->f = f;
__entry->g = g;
__entry->h = h;
),
TP_printk("a %d, b %d, c %d, d %d, e %d, f %d, g %d, h %d",
__entry->a, __entry->b, __entry->c, __entry->d,
__entry->e, __entry->f, __entry->g, __entry->h)
);
#endif /* _TRACE_TEST_H || TRACE_HEADER_MULTI_READ */
#undef TRACE_INCLUDE_PATH
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE trace_events_filter_test
/* This part must be outside protection */
#include <trace/define_trace.h>

4
kernel/trace/trace_irqsoff.c
View File

@ -505,13 +505,13 @@ EXPORT_SYMBOL(trace_hardirqs_off_caller);
#ifdef CONFIG_PREEMPT_TRACER
void trace_preempt_on(unsigned long a0, unsigned long a1)
{
if (preempt_trace())
if (preempt_trace() && !irq_trace())
stop_critical_timing(a0, a1);
}
void trace_preempt_off(unsigned long a0, unsigned long a1)
{
if (preempt_trace())
if (preempt_trace() && !irq_trace())
start_critical_timing(a0, a1);
}
#endif /* CONFIG_PREEMPT_TRACER */

19
kernel/trace/trace_printk.c
View File

@ -59,18 +59,19 @@ void hold_module_trace_bprintk_format(const char **start, const char **end)
continue;
}
fmt = NULL;
tb_fmt = kmalloc(sizeof(*tb_fmt), GFP_KERNEL);
if (tb_fmt)
if (tb_fmt) {
fmt = kmalloc(strlen(*iter) + 1, GFP_KERNEL);
if (tb_fmt && fmt) {
list_add_tail(&tb_fmt->list, &trace_bprintk_fmt_list);
strcpy(fmt, *iter);
tb_fmt->fmt = fmt;
*iter = tb_fmt->fmt;
} else {
kfree(tb_fmt);
*iter = NULL;
if (fmt) {
list_add_tail(&tb_fmt->list, &trace_bprintk_fmt_list);
strcpy(fmt, *iter);
tb_fmt->fmt = fmt;
} else
kfree(tb_fmt);
}
*iter = fmt;
}
mutex_unlock(&btrace_mutex);
}

169
kernel/tracepoint.c
View File

@ -34,11 +34,16 @@ extern struct tracepoint * const __stop___tracepoints_ptrs[];
static const int tracepoint_debug;
/*
* tracepoints_mutex nests inside module_mutex. Tracepoints mutex protects the
* builtin and module tracepoints and the hash table.
* Tracepoints mutex protects the builtin and module tracepoints and the hash
* table, as well as the local module list.
*/
static DEFINE_MUTEX(tracepoints_mutex);
#ifdef CONFIG_MODULES
/* Local list of struct module */
static LIST_HEAD(tracepoint_module_list);
#endif /* CONFIG_MODULES */
/*
* Tracepoint hash table, containing the active tracepoints.
* Protected by tracepoints_mutex.
@ -292,9 +297,10 @@ static void disable_tracepoint(struct tracepoint *elem)
* @end: end of the range
*
* Updates the probe callback corresponding to a range of tracepoints.
* Called with tracepoints_mutex held.
*/
void tracepoint_update_probe_range(struct tracepoint * const *begin,
struct tracepoint * const *end)
static void tracepoint_update_probe_range(struct tracepoint * const *begin,
struct tracepoint * const *end)
{
struct tracepoint * const *iter;
struct tracepoint_entry *mark_entry;
@ -302,7 +308,6 @@ void tracepoint_update_probe_range(struct tracepoint * const *begin,
if (!begin)
return;
mutex_lock(&tracepoints_mutex);
for (iter = begin; iter < end; iter++) {
mark_entry = get_tracepoint((*iter)->name);
if (mark_entry) {
@ -312,11 +317,27 @@ void tracepoint_update_probe_range(struct tracepoint * const *begin,
disable_tracepoint(*iter);
}
}
mutex_unlock(&tracepoints_mutex);
}
#ifdef CONFIG_MODULES
void module_update_tracepoints(void)
{
struct tp_module *tp_mod;
list_for_each_entry(tp_mod, &tracepoint_module_list, list)
tracepoint_update_probe_range(tp_mod->tracepoints_ptrs,
tp_mod->tracepoints_ptrs + tp_mod->num_tracepoints);
}
#else /* CONFIG_MODULES */
void module_update_tracepoints(void)
{
}
#endif /* CONFIG_MODULES */
/*
* Update probes, removing the faulty probes.
* Called with tracepoints_mutex held.
*/
static void tracepoint_update_probes(void)
{
@ -359,11 +380,12 @@ int tracepoint_probe_register(const char *name, void *probe, void *data)
mutex_lock(&tracepoints_mutex);
old = tracepoint_add_probe(name, probe, data);
mutex_unlock(&tracepoints_mutex);
if (IS_ERR(old))
if (IS_ERR(old)) {
mutex_unlock(&tracepoints_mutex);
return PTR_ERR(old);
}
tracepoint_update_probes(); /* may update entry */
mutex_unlock(&tracepoints_mutex);
release_probes(old);
return 0;
}
@ -402,11 +424,12 @@ int tracepoint_probe_unregister(const char *name, void *probe, void *data)
mutex_lock(&tracepoints_mutex);
old = tracepoint_remove_probe(name, probe, data);
mutex_unlock(&tracepoints_mutex);
if (IS_ERR(old))
if (IS_ERR(old)) {
mutex_unlock(&tracepoints_mutex);
return PTR_ERR(old);
}
tracepoint_update_probes(); /* may update entry */
mutex_unlock(&tracepoints_mutex);
release_probes(old);
return 0;
}
@ -489,9 +512,8 @@ void tracepoint_probe_update_all(void)
if (!list_empty(&old_probes))
list_replace_init(&old_probes, &release_probes);
need_update = 0;
mutex_unlock(&tracepoints_mutex);
tracepoint_update_probes();
mutex_unlock(&tracepoints_mutex);
list_for_each_entry_safe(pos, next, &release_probes, u.list) {
list_del(&pos->u.list);
call_rcu_sched(&pos->u.rcu, rcu_free_old_probes);
@ -509,7 +531,7 @@ EXPORT_SYMBOL_GPL(tracepoint_probe_update_all);
* Will return the first tracepoint in the range if the input tracepoint is
* NULL.
*/
int tracepoint_get_iter_range(struct tracepoint * const **tracepoint,
static int tracepoint_get_iter_range(struct tracepoint * const **tracepoint,
struct tracepoint * const *begin, struct tracepoint * const *end)
{
if (!*tracepoint && begin != end) {
@ -520,11 +542,12 @@ int tracepoint_get_iter_range(struct tracepoint * const **tracepoint,
return 1;
return 0;
}
EXPORT_SYMBOL_GPL(tracepoint_get_iter_range);
#ifdef CONFIG_MODULES
static void tracepoint_get_iter(struct tracepoint_iter *iter)
{
int found = 0;
struct tp_module *iter_mod;
/* Core kernel tracepoints */
if (!iter->module) {
@ -534,12 +557,43 @@ static void tracepoint_get_iter(struct tracepoint_iter *iter)
if (found)
goto end;
}
/* tracepoints in modules. */
found = module_get_iter_tracepoints(iter);
/* Tracepoints in modules */
mutex_lock(&tracepoints_mutex);
list_for_each_entry(iter_mod, &tracepoint_module_list, list) {
/*
* Sorted module list
*/
if (iter_mod < iter->module)
continue;
else if (iter_mod > iter->module)
iter->tracepoint = NULL;
found = tracepoint_get_iter_range(&iter->tracepoint,
iter_mod->tracepoints_ptrs,
iter_mod->tracepoints_ptrs
+ iter_mod->num_tracepoints);
if (found) {
iter->module = iter_mod;
break;
}
}
mutex_unlock(&tracepoints_mutex);
end:
if (!found)
tracepoint_iter_reset(iter);
}
#else /* CONFIG_MODULES */
static void tracepoint_get_iter(struct tracepoint_iter *iter)
{
int found = 0;
/* Core kernel tracepoints */
found = tracepoint_get_iter_range(&iter->tracepoint,
__start___tracepoints_ptrs,
__stop___tracepoints_ptrs);
if (!found)
tracepoint_iter_reset(iter);
}
#endif /* CONFIG_MODULES */
void tracepoint_iter_start(struct tracepoint_iter *iter)
{
@ -566,26 +620,98 @@ EXPORT_SYMBOL_GPL(tracepoint_iter_stop);
void tracepoint_iter_reset(struct tracepoint_iter *iter)
{
#ifdef CONFIG_MODULES
iter->module = NULL;
#endif /* CONFIG_MODULES */
iter->tracepoint = NULL;
}
EXPORT_SYMBOL_GPL(tracepoint_iter_reset);
#ifdef CONFIG_MODULES
static int tracepoint_module_coming(struct module *mod)
{
struct tp_module *tp_mod, *iter;
int ret = 0;
/*
* We skip modules that tain the kernel, especially those with different
* module header (for forced load), to make sure we don't cause a crash.
*/
if (mod->taints)
return 0;
mutex_lock(&tracepoints_mutex);
tp_mod = kmalloc(sizeof(struct tp_module), GFP_KERNEL);
if (!tp_mod) {
ret = -ENOMEM;
goto end;
}
tp_mod->num_tracepoints = mod->num_tracepoints;
tp_mod->tracepoints_ptrs = mod->tracepoints_ptrs;
/*
* tracepoint_module_list is kept sorted by struct module pointer
* address for iteration on tracepoints from a seq_file that can release
* the mutex between calls.
*/
list_for_each_entry_reverse(iter, &tracepoint_module_list, list) {
BUG_ON(iter == tp_mod); /* Should never be in the list twice */
if (iter < tp_mod) {
/* We belong to the location right after iter. */
list_add(&tp_mod->list, &iter->list);
goto module_added;
}
}
/* We belong to the beginning of the list */
list_add(&tp_mod->list, &tracepoint_module_list);
module_added:
tracepoint_update_probe_range(mod->tracepoints_ptrs,
mod->tracepoints_ptrs + mod->num_tracepoints);
end:
mutex_unlock(&tracepoints_mutex);
return ret;
}
static int tracepoint_module_going(struct module *mod)
{
struct tp_module *pos;
mutex_lock(&tracepoints_mutex);
tracepoint_update_probe_range(mod->tracepoints_ptrs,
mod->tracepoints_ptrs + mod->num_tracepoints);
list_for_each_entry(pos, &tracepoint_module_list, list) {
if (pos->tracepoints_ptrs == mod->tracepoints_ptrs) {
list_del(&pos->list);
kfree(pos);
break;
}
}
/*
* In the case of modules that were tainted at "coming", we'll simply
* walk through the list without finding it. We cannot use the "tainted"
* flag on "going", in case a module taints the kernel only after being
* loaded.
*/
mutex_unlock(&tracepoints_mutex);
return 0;
}
int tracepoint_module_notify(struct notifier_block *self,
unsigned long val, void *data)
{
struct module *mod = data;
int ret = 0;
switch (val) {
case MODULE_STATE_COMING:
ret = tracepoint_module_coming(mod);
break;
case MODULE_STATE_LIVE:
break;
case MODULE_STATE_GOING:
tracepoint_update_probe_range(mod->tracepoints_ptrs,
mod->tracepoints_ptrs + mod->num_tracepoints);
ret = tracepoint_module_going(mod);
break;
}
return 0;
return ret;
}
struct notifier_block tracepoint_module_nb = {
@ -598,7 +724,6 @@ static int init_tracepoints(void)
return register_module_notifier(&tracepoint_module_nb);
}
__initcall(init_tracepoints);
#endif /* CONFIG_MODULES */
#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS