[for-next][PATCH 21/25] tracing: Move trace_flags from global to a trace_array field

From: Steven Rostedt
Date: Thu Oct 01 2015 - 07:57:15 EST

From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>

In preparation to make trace options per instance, the global trace_flags
needs to be moved from being a global variable to a field within the trace
instance trace_array structure.

There's still more work to do, as there's some functions that use
trace_flags without passing in a way to get to the current_trace array. For
those, the global_trace is used directly (from trace.c). This includes
setting and clearing the trace_flags. This means that when a new instance is
created, it just gets the trace_flags of the global_trace and will not be
able to modify them. Depending on the functions that have access to the
trace_array, the flags of an instance may not affect parts of its trace,
where the global_trace is used. These will be fixed in future changes.

Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
kernel/trace/blktrace.c | 7 +--
kernel/trace/trace.c | 92 +++++++++++++++++++++---------------
kernel/trace/trace.h | 5 +-
kernel/trace/trace_events.c | 3 +-
kernel/trace/trace_functions_graph.c | 50 ++++++++++++--------
kernel/trace/trace_irqsoff.c | 28 ++++++-----
kernel/trace/trace_kdb.c | 8 ++--
kernel/trace/trace_output.c | 14 ++++--
kernel/trace/trace_sched_wakeup.c | 26 +++++-----
kernel/trace/trace_syscalls.c | 3 +-
10 files changed, 135 insertions(+), 101 deletions(-)

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 973d41d81aa5..b2fcf472774e 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1343,6 +1343,7 @@ static const struct {
static enum print_line_t print_one_line(struct trace_iterator *iter,
bool classic)
{
+ struct trace_array *tr = iter->tr;
struct trace_seq *s = &iter->seq;
const struct blk_io_trace *t;
u16 what;
@@ -1351,7 +1352,7 @@ static enum print_line_t print_one_line(struct trace_iterator *iter,

t = te_blk_io_trace(iter->ent);
what = t->action & ((1 << BLK_TC_SHIFT) - 1);
- long_act = !!(trace_flags & TRACE_ITER_VERBOSE);
+ long_act = !!(tr->trace_flags & TRACE_ITER_VERBOSE);
log_action = classic ? &blk_log_action_classic : &blk_log_action;

if (t->action == BLK_TN_MESSAGE) {
@@ -1413,9 +1414,9 @@ blk_tracer_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
/* don't output context-info for blk_classic output */
if (bit == TRACE_BLK_OPT_CLASSIC) {
if (set)
- trace_flags &= ~TRACE_ITER_CONTEXT_INFO;
+ tr->trace_flags &= ~TRACE_ITER_CONTEXT_INFO;
else
- trace_flags |= TRACE_ITER_CONTEXT_INFO;
+ tr->trace_flags |= TRACE_ITER_CONTEXT_INFO;
}
return 0;
}
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index e26933c2edaa..4e82f4ad68dc 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -250,6 +250,14 @@ unsigned long long ns2usecs(cycle_t nsec)
return nsec;
}

+/* trace_flags holds trace_options default values */
+#define TRACE_DEFAULT_FLAGS \
+ (FUNCTION_DEFAULT_FLAGS | \
+ TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | \
+ TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | \
+ TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE | \
+ TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS)
+
/*
* The global_trace is the descriptor that holds the tracing
* buffers for the live tracing. For each CPU, it contains
@@ -262,7 +270,9 @@ unsigned long long ns2usecs(cycle_t nsec)
* pages for the buffer for that CPU. Each CPU has the same number
* of pages allocated for its buffer.
*/
-static struct trace_array global_trace;
+static struct trace_array global_trace = {
+ .trace_flags = TRACE_DEFAULT_FLAGS,
+};

LIST_HEAD(ftrace_trace_arrays);

@@ -490,15 +500,6 @@ static inline void ftrace_trace_stack(struct ring_buffer *buffer,

#endif

-/* trace_flags holds trace_options default values */
-unsigned long trace_flags =
- FUNCTION_DEFAULT_FLAGS |
- TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
- TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO |
- TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE |
- TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS
- ;
-
static void tracer_tracing_on(struct trace_array *tr)
{
if (tr->trace_buffer.buffer)
@@ -543,7 +544,7 @@ int __trace_puts(unsigned long ip, const char *str, int size)
int alloc;
int pc;

- if (!(trace_flags & TRACE_ITER_PRINTK))
+ if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
return 0;

pc = preempt_count();
@@ -593,7 +594,7 @@ int __trace_bputs(unsigned long ip, const char *str)
int size = sizeof(struct bputs_entry);
int pc;

- if (!(trace_flags & TRACE_ITER_PRINTK))
+ if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
return 0;

pc = preempt_count();
@@ -1875,7 +1876,7 @@ static inline void ftrace_trace_stack(struct ring_buffer *buffer,
unsigned long flags,
int skip, int pc, struct pt_regs *regs)
{
- if (!(trace_flags & TRACE_ITER_STACKTRACE))
+ if (!(global_trace.trace_flags & TRACE_ITER_STACKTRACE))
return;

__ftrace_trace_stack(buffer, flags, skip, pc, regs);
@@ -1919,7 +1920,7 @@ ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, int pc)
struct userstack_entry *entry;
struct stack_trace trace;

- if (!(trace_flags & TRACE_ITER_USERSTACKTRACE))
+ if (!(global_trace.trace_flags & TRACE_ITER_USERSTACKTRACE))
return;

/*
@@ -2236,7 +2237,7 @@ int trace_array_printk(struct trace_array *tr,
int ret;
va_list ap;

- if (!(trace_flags & TRACE_ITER_PRINTK))
+ if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
return 0;

va_start(ap, fmt);
@@ -2251,7 +2252,7 @@ int trace_array_printk_buf(struct ring_buffer *buffer,
int ret;
va_list ap;

- if (!(trace_flags & TRACE_ITER_PRINTK))
+ if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
return 0;

va_start(ap, fmt);
@@ -2592,7 +2593,7 @@ static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file
void
print_trace_header(struct seq_file *m, struct trace_iterator *iter)
{
- unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
+ unsigned long sym_flags = (global_trace.trace_flags & TRACE_ITER_SYM_MASK);
struct trace_buffer *buf = iter->trace_buffer;
struct trace_array_cpu *data = per_cpu_ptr(buf->data, buf->cpu);
struct tracer *type = iter->trace;
@@ -2654,8 +2655,9 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter)
static void test_cpu_buff_start(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
+ struct trace_array *tr = iter->tr;

- if (!(trace_flags & TRACE_ITER_ANNOTATE))
+ if (!(tr->trace_flags & TRACE_ITER_ANNOTATE))
return;

if (!(iter->iter_flags & TRACE_FILE_ANNOTATE))
@@ -2677,8 +2679,9 @@ static void test_cpu_buff_start(struct trace_iterator *iter)

static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
{
+ struct trace_array *tr = iter->tr;
struct trace_seq *s = &iter->seq;
- unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
+ unsigned long sym_flags = (tr->trace_flags & TRACE_ITER_SYM_MASK);
struct trace_entry *entry;
struct trace_event *event;

@@ -2688,7 +2691,7 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)

event = ftrace_find_event(entry->type);

- if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+ if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
if (iter->iter_flags & TRACE_FILE_LAT_FMT)
trace_print_lat_context(iter);
else
@@ -2708,13 +2711,14 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)

static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
{
+ struct trace_array *tr = iter->tr;
struct trace_seq *s = &iter->seq;
struct trace_entry *entry;
struct trace_event *event;

entry = iter->ent;

- if (trace_flags & TRACE_ITER_CONTEXT_INFO)
+ if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO)
trace_seq_printf(s, "%d %d %llu ",
entry->pid, iter->cpu, iter->ts);

@@ -2732,6 +2736,7 @@ static enum print_line_t print_raw_fmt(struct trace_iterator *iter)

static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
{
+ struct trace_array *tr = iter->tr;
struct trace_seq *s = &iter->seq;
unsigned char newline = '\n';
struct trace_entry *entry;
@@ -2739,7 +2744,7 @@ static enum print_line_t print_hex_fmt(struct trace_iterator *iter)

entry = iter->ent;

- if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+ if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
SEQ_PUT_HEX_FIELD(s, entry->pid);
SEQ_PUT_HEX_FIELD(s, iter->cpu);
SEQ_PUT_HEX_FIELD(s, iter->ts);
@@ -2761,13 +2766,14 @@ static enum print_line_t print_hex_fmt(struct trace_iterator *iter)

static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
{
+ struct trace_array *tr = iter->tr;
struct trace_seq *s = &iter->seq;
struct trace_entry *entry;
struct trace_event *event;

entry = iter->ent;

- if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+ if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
SEQ_PUT_FIELD(s, entry->pid);
SEQ_PUT_FIELD(s, iter->cpu);
SEQ_PUT_FIELD(s, iter->ts);
@@ -2816,6 +2822,8 @@ int trace_empty(struct trace_iterator *iter)
/* Called with trace_event_read_lock() held. */
enum print_line_t print_trace_line(struct trace_iterator *iter)
{
+ struct trace_array *tr = iter->tr;
+ unsigned long trace_flags = tr->trace_flags;
enum print_line_t ret;

if (iter->lost_events) {
@@ -2861,6 +2869,7 @@ enum print_line_t print_trace_line(struct trace_iterator *iter)
void trace_latency_header(struct seq_file *m)
{
struct trace_iterator *iter = m->private;
+ struct trace_array *tr = iter->tr;

/* print nothing if the buffers are empty */
if (trace_empty(iter))
@@ -2869,13 +2878,15 @@ void trace_latency_header(struct seq_file *m)
if (iter->iter_flags & TRACE_FILE_LAT_FMT)
print_trace_header(m, iter);

- if (!(trace_flags & TRACE_ITER_VERBOSE))
+ if (!(tr->trace_flags & TRACE_ITER_VERBOSE))
print_lat_help_header(m);
}

void trace_default_header(struct seq_file *m)
{
struct trace_iterator *iter = m->private;
+ struct trace_array *tr = iter->tr;
+ unsigned long trace_flags = tr->trace_flags;

if (!(trace_flags & TRACE_ITER_CONTEXT_INFO))
return;
@@ -3220,7 +3231,7 @@ static int tracing_open(struct inode *inode, struct file *file)
iter = __tracing_open(inode, file, false);
if (IS_ERR(iter))
ret = PTR_ERR(iter);
- else if (trace_flags & TRACE_ITER_LATENCY_FMT)
+ else if (tr->trace_flags & TRACE_ITER_LATENCY_FMT)
iter->iter_flags |= TRACE_FILE_LAT_FMT;
}

@@ -3467,7 +3478,7 @@ static int tracing_trace_options_show(struct seq_file *m, void *v)
trace_opts = tr->current_trace->flags->opts;

for (i = 0; trace_options[i]; i++) {
- if (trace_flags & (1 << i))
+ if (tr->trace_flags & (1 << i))
seq_printf(m, "%s\n", trace_options[i]);
else
seq_printf(m, "no%s\n", trace_options[i]);
@@ -3532,7 +3543,7 @@ int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set)
int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled)
{
/* do nothing if flag is already set */
- if (!!(trace_flags & mask) == !!enabled)
+ if (!!(tr->trace_flags & mask) == !!enabled)
return 0;

/* Give the tracer a chance to approve the change */
@@ -3541,9 +3552,9 @@ int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled)
return -EINVAL;

if (enabled)
- trace_flags |= mask;
+ tr->trace_flags |= mask;
else
- trace_flags &= ~mask;
+ tr->trace_flags &= ~mask;

if (mask == TRACE_ITER_RECORD_CMD)
trace_event_enable_cmd_record(enabled);
@@ -4558,7 +4569,7 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
/* trace pipe does not show start of buffer */
cpumask_setall(iter->started);

- if (trace_flags & TRACE_ITER_LATENCY_FMT)
+ if (tr->trace_flags & TRACE_ITER_LATENCY_FMT)
iter->iter_flags |= TRACE_FILE_LAT_FMT;

/* Output in nanoseconds only if we are using a clock in nanoseconds. */
@@ -4615,11 +4626,13 @@ static int tracing_release_pipe(struct inode *inode, struct file *file)
static unsigned int
trace_poll(struct trace_iterator *iter, struct file *filp, poll_table *poll_table)
{
+ struct trace_array *tr = iter->tr;
+
/* Iterators are static, they should be filled or empty */
if (trace_buffer_iter(iter, iter->cpu_file))
return POLLIN | POLLRDNORM;

- if (trace_flags & TRACE_ITER_BLOCK)
+ if (tr->trace_flags & TRACE_ITER_BLOCK)
/*
* Always select as readable when in blocking mode
*/
@@ -5036,7 +5049,7 @@ tracing_free_buffer_release(struct inode *inode, struct file *filp)
struct trace_array *tr = inode->i_private;

/* disable tracing ? */
- if (trace_flags & TRACE_ITER_STOP_ON_FREE)
+ if (tr->trace_flags & TRACE_ITER_STOP_ON_FREE)
tracer_tracing_off(tr);
/* resize the ring buffer to 0 */
tracing_resize_ring_buffer(tr, 0, RING_BUFFER_ALL_CPUS);
@@ -5069,7 +5082,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
if (tracing_disabled)
return -EINVAL;

- if (!(trace_flags & TRACE_ITER_MARKERS))
+ if (!(tr->trace_flags & TRACE_ITER_MARKERS))
return -EINVAL;

if (cnt > TRACE_BUF_SIZE)
@@ -6180,7 +6193,7 @@ trace_options_core_read(struct file *filp, char __user *ubuf, size_t cnt,
long index = (long)filp->private_data;
char *buf;

- if (trace_flags & (1 << index))
+ if (global_trace.trace_flags & (1 << index))
buf = "1\n";
else
buf = "0\n";
@@ -6407,7 +6420,7 @@ allocate_trace_buffer(struct trace_array *tr, struct trace_buffer *buf, int size
{
enum ring_buffer_flags rb_flags;

- rb_flags = trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0;
+ rb_flags = tr->trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0;

buf->tr = tr;

@@ -6502,6 +6515,8 @@ static int instance_mkdir(const char *name)
if (!alloc_cpumask_var(&tr->tracing_cpumask, GFP_KERNEL))
goto out_free_tr;

+ tr->trace_flags = global_trace.trace_flags;
+
cpumask_copy(tr->tracing_cpumask, cpu_all_mask);

raw_spin_lock_init(&tr->start_lock);
@@ -6938,6 +6953,7 @@ void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
/* use static because iter can be a bit big for the stack */
static struct trace_iterator iter;
static atomic_t dump_running;
+ struct trace_array *tr = &global_trace;
unsigned int old_userobj;
unsigned long flags;
int cnt = 0, cpu;
@@ -6967,10 +6983,10 @@ void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
atomic_inc(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
}

- old_userobj = trace_flags & TRACE_ITER_SYM_USEROBJ;
+ old_userobj = tr->trace_flags & TRACE_ITER_SYM_USEROBJ;

/* don't look at user memory in panic mode */
- trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
+ tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ;

switch (oops_dump_mode) {
case DUMP_ALL:
@@ -7033,7 +7049,7 @@ void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
printk(KERN_TRACE "---------------------------------\n");

out_enable:
- trace_flags |= old_userobj;
+ tr->trace_flags |= old_userobj;

for_each_tracing_cpu(cpu) {
atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 5219bf5f708a..eda4e6f8159b 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -217,6 +217,7 @@ struct trace_array {
int stop_count;
int clock_id;
struct tracer *current_trace;
+ unsigned int trace_flags;
unsigned int flags;
raw_spinlock_t start_lock;
struct dentry *dir;
@@ -698,8 +699,6 @@ int trace_array_printk_buf(struct ring_buffer *buffer,
void trace_printk_seq(struct trace_seq *s);
enum print_line_t print_trace_line(struct trace_iterator *iter);

-extern unsigned long trace_flags;
-
extern char trace_find_mark(unsigned long long duration);

/* Standard output formatting function used for function return traces */
@@ -994,7 +993,7 @@ extern int enable_branch_tracing(struct trace_array *tr);
extern void disable_branch_tracing(void);
static inline int trace_branch_enable(struct trace_array *tr)
{
- if (trace_flags & TRACE_ITER_BRANCH)
+ if (tr->trace_flags & TRACE_ITER_BRANCH)
return enable_branch_tracing(tr);
return 0;
}
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index b2e3d8d80df8..0f394112a0a7 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -338,6 +338,7 @@ static int __ftrace_event_enable_disable(struct trace_event_file *file,
int enable, int soft_disable)
{
struct trace_event_call *call = file->event_call;
+ struct trace_array *tr = file->tr;
int ret = 0;
int disable;

@@ -401,7 +402,7 @@ static int __ftrace_event_enable_disable(struct trace_event_file *file,
if (soft_disable)
set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags);

- if (trace_flags & TRACE_ITER_RECORD_CMD) {
+ if (tr->trace_flags & TRACE_ITER_RECORD_CMD) {
tracing_start_cmdline_record();
set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags);
}
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 86e45c2658e4..92382af7a213 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -112,8 +112,8 @@ enum {
};

static void
-print_graph_duration(unsigned long long duration, struct trace_seq *s,
- u32 flags);
+print_graph_duration(struct trace_array *tr, unsigned long long duration,
+ struct trace_seq *s, u32 flags);

/* Add a function return address to the trace stack on thread info.*/
int
@@ -658,6 +658,7 @@ static void
print_graph_irq(struct trace_iterator *iter, unsigned long addr,
enum trace_type type, int cpu, pid_t pid, u32 flags)
{
+ struct trace_array *tr = iter->tr;
struct trace_seq *s = &iter->seq;
struct trace_entry *ent = iter->ent;

@@ -665,7 +666,7 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
addr >= (unsigned long)__irqentry_text_end)
return;

- if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+ if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
/* Absolute time */
if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
print_graph_abs_time(iter->ts, s);
@@ -681,19 +682,19 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
}

/* Latency format */
- if (trace_flags & TRACE_ITER_LATENCY_FMT)
+ if (tr->trace_flags & TRACE_ITER_LATENCY_FMT)
print_graph_lat_fmt(s, ent);
}

/* No overhead */
- print_graph_duration(0, s, flags | FLAGS_FILL_START);
+ print_graph_duration(tr, 0, s, flags | FLAGS_FILL_START);

if (type == TRACE_GRAPH_ENT)
trace_seq_puts(s, "==========>");
else
trace_seq_puts(s, "<==========");

- print_graph_duration(0, s, flags | FLAGS_FILL_END);
+ print_graph_duration(tr, 0, s, flags | FLAGS_FILL_END);
trace_seq_putc(s, '\n');
}

@@ -731,11 +732,11 @@ trace_print_graph_duration(unsigned long long duration, struct trace_seq *s)
}

static void
-print_graph_duration(unsigned long long duration, struct trace_seq *s,
- u32 flags)
+print_graph_duration(struct trace_array *tr, unsigned long long duration,
+ struct trace_seq *s, u32 flags)
{
if (!(flags & TRACE_GRAPH_PRINT_DURATION) ||
- !(trace_flags & TRACE_ITER_CONTEXT_INFO))
+ !(tr->trace_flags & TRACE_ITER_CONTEXT_INFO))
return;

/* No real adata, just filling the column with spaces */
@@ -769,6 +770,7 @@ print_graph_entry_leaf(struct trace_iterator *iter,
struct trace_seq *s, u32 flags)
{
struct fgraph_data *data = iter->private;
+ struct trace_array *tr = iter->tr;
struct ftrace_graph_ret *graph_ret;
struct ftrace_graph_ent *call;
unsigned long long duration;
@@ -797,7 +799,7 @@ print_graph_entry_leaf(struct trace_iterator *iter,
}

/* Overhead and duration */
- print_graph_duration(duration, s, flags);
+ print_graph_duration(tr, duration, s, flags);

/* Function */
for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++)
@@ -815,6 +817,7 @@ print_graph_entry_nested(struct trace_iterator *iter,
{
struct ftrace_graph_ent *call = &entry->graph_ent;
struct fgraph_data *data = iter->private;
+ struct trace_array *tr = iter->tr;
int i;

if (data) {
@@ -830,7 +833,7 @@ print_graph_entry_nested(struct trace_iterator *iter,
}

/* No time */
- print_graph_duration(0, s, flags | FLAGS_FILL_FULL);
+ print_graph_duration(tr, 0, s, flags | FLAGS_FILL_FULL);

/* Function */
for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++)
@@ -854,6 +857,7 @@ print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
{
struct fgraph_data *data = iter->private;
struct trace_entry *ent = iter->ent;
+ struct trace_array *tr = iter->tr;
int cpu = iter->cpu;

/* Pid */
@@ -863,7 +867,7 @@ print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
/* Interrupt */
print_graph_irq(iter, addr, type, cpu, ent->pid, flags);

- if (!(trace_flags & TRACE_ITER_CONTEXT_INFO))
+ if (!(tr->trace_flags & TRACE_ITER_CONTEXT_INFO))
return;

/* Absolute time */
@@ -881,7 +885,7 @@ print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
}

/* Latency format */
- if (trace_flags & TRACE_ITER_LATENCY_FMT)
+ if (tr->trace_flags & TRACE_ITER_LATENCY_FMT)
print_graph_lat_fmt(s, ent);

return;
@@ -1032,6 +1036,7 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
{
unsigned long long duration = trace->rettime - trace->calltime;
struct fgraph_data *data = iter->private;
+ struct trace_array *tr = iter->tr;
pid_t pid = ent->pid;
int cpu = iter->cpu;
int func_match = 1;
@@ -1063,7 +1068,7 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
print_graph_prologue(iter, s, 0, 0, flags);

/* Overhead and duration */
- print_graph_duration(duration, s, flags);
+ print_graph_duration(tr, duration, s, flags);

/* Closing brace */
for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++)
@@ -1096,7 +1101,8 @@ static enum print_line_t
print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
struct trace_iterator *iter, u32 flags)
{
- unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
+ struct trace_array *tr = iter->tr;
+ unsigned long sym_flags = (tr->trace_flags & TRACE_ITER_SYM_MASK);
struct fgraph_data *data = iter->private;
struct trace_event *event;
int depth = 0;
@@ -1109,7 +1115,7 @@ print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
print_graph_prologue(iter, s, 0, 0, flags);

/* No time */
- print_graph_duration(0, s, flags | FLAGS_FILL_FULL);
+ print_graph_duration(tr, 0, s, flags | FLAGS_FILL_FULL);

/* Indentation */
if (depth > 0)
@@ -1250,9 +1256,10 @@ static void print_lat_header(struct seq_file *s, u32 flags)
seq_printf(s, "#%.*s||| / \n", size, spaces);
}

-static void __print_graph_headers_flags(struct seq_file *s, u32 flags)
+static void __print_graph_headers_flags(struct trace_array *tr,
+ struct seq_file *s, u32 flags)
{
- int lat = trace_flags & TRACE_ITER_LATENCY_FMT;
+ int lat = tr->trace_flags & TRACE_ITER_LATENCY_FMT;

if (lat)
print_lat_header(s, flags);
@@ -1294,11 +1301,12 @@ static void print_graph_headers(struct seq_file *s)
void print_graph_headers_flags(struct seq_file *s, u32 flags)
{
struct trace_iterator *iter = s->private;
+ struct trace_array *tr = iter->tr;

- if (!(trace_flags & TRACE_ITER_CONTEXT_INFO))
+ if (!(tr->trace_flags & TRACE_ITER_CONTEXT_INFO))
return;

- if (trace_flags & TRACE_ITER_LATENCY_FMT) {
+ if (tr->trace_flags & TRACE_ITER_LATENCY_FMT) {
/* print nothing if the buffers are empty */
if (trace_empty(iter))
return;
@@ -1306,7 +1314,7 @@ void print_graph_headers_flags(struct seq_file *s, u32 flags)
print_trace_header(s, iter);
}

- __print_graph_headers_flags(s, flags);
+ __print_graph_headers_flags(tr, s, flags);
}

void graph_trace_open(struct trace_iterator *iter)
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index c834b95cbe0b..eaf5291bcf63 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -58,13 +58,13 @@ irq_trace(void)

#ifdef CONFIG_FUNCTION_GRAPH_TRACER
static int irqsoff_display_graph(struct trace_array *tr, int set);
-# define is_graph() (trace_flags & TRACE_ITER_DISPLAY_GRAPH)
+# define is_graph(tr) ((tr)->trace_flags & TRACE_ITER_DISPLAY_GRAPH)
#else
static inline int irqsoff_display_graph(struct trace_array *tr, int set)
{
return -EINVAL;
}
-# define is_graph() false
+# define is_graph(tr) false
#endif

/*
@@ -149,7 +149,7 @@ static int irqsoff_display_graph(struct trace_array *tr, int set)
{
int cpu;

- if (!(is_graph() ^ set))
+ if (!(is_graph(tr) ^ set))
return 0;

stop_irqsoff_tracer(irqsoff_trace, !set);
@@ -198,7 +198,7 @@ static void irqsoff_graph_return(struct ftrace_graph_ret *trace)

static void irqsoff_trace_open(struct trace_iterator *iter)
{
- if (is_graph())
+ if (is_graph(iter->tr))
graph_trace_open(iter);

}
@@ -220,7 +220,7 @@ static enum print_line_t irqsoff_print_line(struct trace_iterator *iter)
* In graph mode call the graph tracer output function,
* otherwise go with the TRACE_FN event handler
*/
- if (is_graph())
+ if (is_graph(iter->tr))
return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS);

return TRACE_TYPE_UNHANDLED;
@@ -228,7 +228,9 @@ static enum print_line_t irqsoff_print_line(struct trace_iterator *iter)

static void irqsoff_print_header(struct seq_file *s)
{
- if (is_graph())
+ struct trace_array *tr = irqsoff_trace;
+
+ if (is_graph(tr))
print_graph_headers_flags(s, GRAPH_TRACER_FLAGS);
else
trace_default_header(s);
@@ -239,7 +241,7 @@ __trace_function(struct trace_array *tr,
unsigned long ip, unsigned long parent_ip,
unsigned long flags, int pc)
{
- if (is_graph())
+ if (is_graph(tr))
trace_graph_function(tr, ip, parent_ip, flags, pc);
else
trace_function(tr, ip, parent_ip, flags, pc);
@@ -516,7 +518,7 @@ static int register_irqsoff_function(struct trace_array *tr, int graph, int set)
int ret;

/* 'set' is set if TRACE_ITER_FUNCTION is about to be set */
- if (function_enabled || (!set && !(trace_flags & TRACE_ITER_FUNCTION)))
+ if (function_enabled || (!set && !(tr->trace_flags & TRACE_ITER_FUNCTION)))
return 0;

if (graph)
@@ -550,9 +552,9 @@ static int irqsoff_function_set(struct trace_array *tr, u32 mask, int set)
return 0;

if (set)
- register_irqsoff_function(tr, is_graph(), 1);
+ register_irqsoff_function(tr, is_graph(tr), 1);
else
- unregister_irqsoff_function(tr, is_graph());
+ unregister_irqsoff_function(tr, is_graph(tr));
return 1;
}
#else
@@ -610,7 +612,7 @@ static int __irqsoff_tracer_init(struct trace_array *tr)
if (irqsoff_busy)
return -EBUSY;

- save_flags = trace_flags;
+ save_flags = tr->trace_flags;

/* non overwrite screws up the latency tracers */
set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1);
@@ -626,7 +628,7 @@ static int __irqsoff_tracer_init(struct trace_array *tr)

/* Only toplevel instance supports graph tracing */
if (start_irqsoff_tracer(tr, (tr->flags & TRACE_ARRAY_FL_GLOBAL &&
- is_graph())))
+ is_graph(tr))))
printk(KERN_ERR "failed to start irqsoff tracer\n");

irqsoff_busy = true;
@@ -638,7 +640,7 @@ static void irqsoff_tracer_reset(struct trace_array *tr)
int lat_flag = save_flags & TRACE_ITER_LATENCY_FMT;
int overwrite_flag = save_flags & TRACE_ITER_OVERWRITE;

- stop_irqsoff_tracer(tr, is_graph());
+ stop_irqsoff_tracer(tr, is_graph(tr));

set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag);
set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag);
diff --git a/kernel/trace/trace_kdb.c b/kernel/trace/trace_kdb.c
index 3ccf5c2c1320..57149bce6aad 100644
--- a/kernel/trace/trace_kdb.c
+++ b/kernel/trace/trace_kdb.c
@@ -21,20 +21,22 @@ static void ftrace_dump_buf(int skip_lines, long cpu_file)
/* use static because iter can be a bit big for the stack */
static struct trace_iterator iter;
static struct ring_buffer_iter *buffer_iter[CONFIG_NR_CPUS];
+ struct trace_array *tr;
unsigned int old_userobj;
int cnt = 0, cpu;

trace_init_global_iter(&iter);
iter.buffer_iter = buffer_iter;
+ tr = iter.tr;

for_each_tracing_cpu(cpu) {
atomic_inc(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
}

- old_userobj = trace_flags;
+ old_userobj = tr->trace_flags;

/* don't look at user memory in panic mode */
- trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
+ tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ;

kdb_printf("Dumping ftrace buffer:\n");

@@ -82,7 +84,7 @@ static void ftrace_dump_buf(int skip_lines, long cpu_file)
kdb_printf("---------------------------------\n");

out:
- trace_flags = old_userobj;
+ tr->trace_flags = old_userobj;

for_each_tracing_cpu(cpu) {
atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 3b5dcdf19dea..282982195e09 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -476,7 +476,8 @@ char trace_find_mark(unsigned long long d)
static int
lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
{
- unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
+ struct trace_array *tr = iter->tr;
+ unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
unsigned long long rel_ts = next_ts - iter->ts;
@@ -519,6 +520,7 @@ lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)

int trace_print_context(struct trace_iterator *iter)
{
+ struct trace_array *tr = iter->tr;
struct trace_seq *s = &iter->seq;
struct trace_entry *entry = iter->ent;
unsigned long long t;
@@ -530,7 +532,7 @@ int trace_print_context(struct trace_iterator *iter)
trace_seq_printf(s, "%16s-%-5d [%03d] ",
comm, entry->pid, iter->cpu);

- if (trace_flags & TRACE_ITER_IRQ_INFO)
+ if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
trace_print_lat_fmt(s, entry);

if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
@@ -546,14 +548,15 @@ int trace_print_context(struct trace_iterator *iter)

int trace_print_lat_context(struct trace_iterator *iter)
{
- u64 next_ts;
+ struct trace_array *tr = iter->tr;
/* trace_find_next_entry will reset ent_size */
int ent_size = iter->ent_size;
struct trace_seq *s = &iter->seq;
+ u64 next_ts;
struct trace_entry *entry = iter->ent,
*next_entry = trace_find_next_entry(iter, NULL,
&next_ts);
- unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
+ unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);

/* Restore the original ent_size */
iter->ent_size = ent_size;
@@ -1035,6 +1038,7 @@ static struct trace_event trace_stack_event = {
static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
int flags, struct trace_event *event)
{
+ struct trace_array *tr = iter->tr;
struct userstack_entry *field;
struct trace_seq *s = &iter->seq;
struct mm_struct *mm = NULL;
@@ -1044,7 +1048,7 @@ static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,

trace_seq_puts(s, "<user stack trace>\n");

- if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
+ if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
struct task_struct *task;
/*
* we do the lookup on the thread group leader,
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 4a20f61274d1..4661442de07d 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -39,13 +39,13 @@ static int save_flags;

#ifdef CONFIG_FUNCTION_GRAPH_TRACER
static int wakeup_display_graph(struct trace_array *tr, int set);
-# define is_graph() (trace_flags & TRACE_ITER_DISPLAY_GRAPH)
+# define is_graph(tr) ((tr)->trace_flags & TRACE_ITER_DISPLAY_GRAPH)
#else
static inline int wakeup_display_graph(struct trace_array *tr, int set)
{
return 0;
}
-# define is_graph() false
+# define is_graph(tr) false
#endif


@@ -131,7 +131,7 @@ static int register_wakeup_function(struct trace_array *tr, int graph, int set)
int ret;

/* 'set' is set if TRACE_ITER_FUNCTION is about to be set */
- if (function_enabled || (!set && !(trace_flags & TRACE_ITER_FUNCTION)))
+ if (function_enabled || (!set && !(tr->trace_flags & TRACE_ITER_FUNCTION)))
return 0;

if (graph)
@@ -165,9 +165,9 @@ static int wakeup_function_set(struct trace_array *tr, u32 mask, int set)
return 0;

if (set)
- register_wakeup_function(tr, is_graph(), 1);
+ register_wakeup_function(tr, is_graph(tr), 1);
else
- unregister_wakeup_function(tr, is_graph());
+ unregister_wakeup_function(tr, is_graph(tr));
return 1;
}
#else
@@ -221,7 +221,7 @@ static void stop_func_tracer(struct trace_array *tr, int graph)
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
static int wakeup_display_graph(struct trace_array *tr, int set)
{
- if (!(is_graph() ^ set))
+ if (!(is_graph(tr) ^ set))
return 0;

stop_func_tracer(tr, !set);
@@ -270,7 +270,7 @@ static void wakeup_graph_return(struct ftrace_graph_ret *trace)

static void wakeup_trace_open(struct trace_iterator *iter)
{
- if (is_graph())
+ if (is_graph(iter->tr))
graph_trace_open(iter);
}

@@ -290,7 +290,7 @@ static enum print_line_t wakeup_print_line(struct trace_iterator *iter)
* In graph mode call the graph tracer output function,
* otherwise go with the TRACE_FN event handler
*/
- if (is_graph())
+ if (is_graph(iter->tr))
return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS);

return TRACE_TYPE_UNHANDLED;
@@ -298,7 +298,7 @@ static enum print_line_t wakeup_print_line(struct trace_iterator *iter)

static void wakeup_print_header(struct seq_file *s)
{
- if (is_graph())
+ if (is_graph(wakeup_trace))
print_graph_headers_flags(s, GRAPH_TRACER_FLAGS);
else
trace_default_header(s);
@@ -309,7 +309,7 @@ __trace_function(struct trace_array *tr,
unsigned long ip, unsigned long parent_ip,
unsigned long flags, int pc)
{
- if (is_graph())
+ if (is_graph(tr))
trace_graph_function(tr, ip, parent_ip, flags, pc);
else
trace_function(tr, ip, parent_ip, flags, pc);
@@ -639,7 +639,7 @@ static void start_wakeup_tracer(struct trace_array *tr)
*/
smp_wmb();

- if (start_func_tracer(tr, is_graph()))
+ if (start_func_tracer(tr, is_graph(tr)))
printk(KERN_ERR "failed to start wakeup tracer\n");

return;
@@ -652,7 +652,7 @@ fail_deprobe:
static void stop_wakeup_tracer(struct trace_array *tr)
{
tracer_enabled = 0;
- stop_func_tracer(tr, is_graph());
+ stop_func_tracer(tr, is_graph(tr));
unregister_trace_sched_switch(probe_wakeup_sched_switch, NULL);
unregister_trace_sched_wakeup_new(probe_wakeup, NULL);
unregister_trace_sched_wakeup(probe_wakeup, NULL);
@@ -663,7 +663,7 @@ static bool wakeup_busy;

static int __wakeup_tracer_init(struct trace_array *tr)
{
- save_flags = trace_flags;
+ save_flags = tr->trace_flags;

/* non overwrite screws up the latency tracers */
set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1);
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 7d567a4b9fa7..0655afbea83f 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -110,6 +110,7 @@ static enum print_line_t
print_syscall_enter(struct trace_iterator *iter, int flags,
struct trace_event *event)
{
+ struct trace_array *tr = iter->tr;
struct trace_seq *s = &iter->seq;
struct trace_entry *ent = iter->ent;
struct syscall_trace_enter *trace;
@@ -136,7 +137,7 @@ print_syscall_enter(struct trace_iterator *iter, int flags,
goto end;

/* parameter types */
- if (trace_flags & TRACE_ITER_VERBOSE)
+ if (tr->trace_flags & TRACE_ITER_VERBOSE)
trace_seq_printf(s, "%s ", entry->types[i]);

/* parameter values */
--
2.5.1


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