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authorLinus Torvalds <torvalds@linux-foundation.org>2016-03-24 10:52:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-24 10:52:25 -0700
commite46b4e2b46e173889b19999b8bd033d5e8b3acf0 (patch)
tree43f4770868d372c76ce5f084cc8e23d2942e07d5 /kernel
parentfaea72dd0f155a9d349e191d74830716c702651d (diff)
parent7e6867bf831c71fe0e47438831ae3a94d4c7ab3c (diff)
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Merge tag 'trace-v4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing updates from Steven Rostedt: "Nothing major this round. Mostly small clean ups and fixes. Some visible changes: - A new flag was added to distinguish traces done in NMI context. - Preempt tracer now shows functions where preemption is disabled but interrupts are still enabled. Other notes: - Updates were done to function tracing to allow better performance with perf. - Infrastructure code has been added to allow for a new histogram feature for recording live trace event histograms that can be configured by simple user commands. The feature itself was just finished, but needs a round in linux-next before being pulled. This only includes some infrastructure changes that will be needed" * tag 'trace-v4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (22 commits) tracing: Record and show NMI state tracing: Fix trace_printk() to print when not using bprintk() tracing: Remove redundant reset per-CPU buff in irqsoff tracer x86: ftrace: Fix the misleading comment for arch/x86/kernel/ftrace.c tracing: Fix crash from reading trace_pipe with sendfile tracing: Have preempt(irqs)off trace preempt disabled functions tracing: Fix return while holding a lock in register_tracer() ftrace: Use kasprintf() in ftrace_profile_tracefs() ftrace: Update dynamic ftrace calls only if necessary ftrace: Make ftrace_hash_rec_enable return update bool tracing: Fix typoes in code comment and printk in trace_nop.c tracing, writeback: Replace cgroup path to cgroup ino tracing: Use flags instead of bool in trigger structure tracing: Add an unreg_all() callback to trigger commands tracing: Add needs_rec flag to event triggers tracing: Add a per-event-trigger 'paused' field tracing: Add get_syscall_name() tracing: Add event record param to trigger_ops.func() tracing: Make event trigger functions available tracing: Make ftrace_event_field checking functions available ...
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/ftrace.c41
-rw-r--r--kernel/trace/trace.c36
-rw-r--r--kernel/trace/trace.h113
-rw-r--r--kernel/trace/trace_events_filter.c12
-rw-r--r--kernel/trace/trace_events_trigger.c88
-rw-r--r--kernel/trace/trace_functions.c6
-rw-r--r--kernel/trace/trace_irqsoff.c9
-rw-r--r--kernel/trace/trace_nop.c4
-rw-r--r--kernel/trace/trace_output.c10
-rw-r--r--kernel/trace/trace_printk.c3
-rw-r--r--kernel/trace/trace_syscalls.c11
11 files changed, 222 insertions, 111 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 2ece9f1a3e5a..b1870fbd2b67 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1030,8 +1030,7 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
for_each_possible_cpu(cpu) {
stat = &per_cpu(ftrace_profile_stats, cpu);
- /* allocate enough for function name + cpu number */
- name = kmalloc(32, GFP_KERNEL);
+ name = kasprintf(GFP_KERNEL, "function%d", cpu);
if (!name) {
/*
* The files created are permanent, if something happens
@@ -1043,7 +1042,6 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
return;
}
stat->stat = function_stats;
- snprintf(name, 32, "function%d", cpu);
stat->stat.name = name;
ret = register_stat_tracer(&stat->stat);
if (ret) {
@@ -1609,7 +1607,7 @@ static bool test_rec_ops_needs_regs(struct dyn_ftrace *rec)
return keep_regs;
}
-static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
+static bool __ftrace_hash_rec_update(struct ftrace_ops *ops,
int filter_hash,
bool inc)
{
@@ -1617,12 +1615,13 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
struct ftrace_hash *other_hash;
struct ftrace_page *pg;
struct dyn_ftrace *rec;
+ bool update = false;
int count = 0;
int all = 0;
/* Only update if the ops has been registered */
if (!(ops->flags & FTRACE_OPS_FL_ENABLED))
- return;
+ return false;
/*
* In the filter_hash case:
@@ -1649,7 +1648,7 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
* then there's nothing to do.
*/
if (ftrace_hash_empty(hash))
- return;
+ return false;
}
do_for_each_ftrace_rec(pg, rec) {
@@ -1693,7 +1692,7 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
if (inc) {
rec->flags++;
if (FTRACE_WARN_ON(ftrace_rec_count(rec) == FTRACE_REF_MAX))
- return;
+ return false;
/*
* If there's only a single callback registered to a
@@ -1719,7 +1718,7 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
rec->flags |= FTRACE_FL_REGS;
} else {
if (FTRACE_WARN_ON(ftrace_rec_count(rec) == 0))
- return;
+ return false;
rec->flags--;
/*
@@ -1752,22 +1751,28 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
*/
}
count++;
+
+ /* Must match FTRACE_UPDATE_CALLS in ftrace_modify_all_code() */
+ update |= ftrace_test_record(rec, 1) != FTRACE_UPDATE_IGNORE;
+
/* Shortcut, if we handled all records, we are done. */
if (!all && count == hash->count)
- return;
+ return update;
} while_for_each_ftrace_rec();
+
+ return update;
}
-static void ftrace_hash_rec_disable(struct ftrace_ops *ops,
+static bool ftrace_hash_rec_disable(struct ftrace_ops *ops,
int filter_hash)
{
- __ftrace_hash_rec_update(ops, filter_hash, 0);
+ return __ftrace_hash_rec_update(ops, filter_hash, 0);
}
-static void ftrace_hash_rec_enable(struct ftrace_ops *ops,
+static bool ftrace_hash_rec_enable(struct ftrace_ops *ops,
int filter_hash)
{
- __ftrace_hash_rec_update(ops, filter_hash, 1);
+ return __ftrace_hash_rec_update(ops, filter_hash, 1);
}
static void ftrace_hash_rec_update_modify(struct ftrace_ops *ops,
@@ -2643,7 +2648,6 @@ static int ftrace_startup(struct ftrace_ops *ops, int command)
return ret;
ftrace_start_up++;
- command |= FTRACE_UPDATE_CALLS;
/*
* Note that ftrace probes uses this to start up
@@ -2664,7 +2668,8 @@ static int ftrace_startup(struct ftrace_ops *ops, int command)
return ret;
}
- ftrace_hash_rec_enable(ops, 1);
+ if (ftrace_hash_rec_enable(ops, 1))
+ command |= FTRACE_UPDATE_CALLS;
ftrace_startup_enable(command);
@@ -2694,11 +2699,11 @@ static int ftrace_shutdown(struct ftrace_ops *ops, int command)
/* Disabling ipmodify never fails */
ftrace_hash_ipmodify_disable(ops);
- ftrace_hash_rec_disable(ops, 1);
- ops->flags &= ~FTRACE_OPS_FL_ENABLED;
+ if (ftrace_hash_rec_disable(ops, 1))
+ command |= FTRACE_UPDATE_CALLS;
- command |= FTRACE_UPDATE_CALLS;
+ ops->flags &= ~FTRACE_OPS_FL_ENABLED;
if (saved_ftrace_func != ftrace_trace_function) {
saved_ftrace_func = ftrace_trace_function;
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 032b388bea66..a2f0b9f33e9b 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -74,11 +74,6 @@ static struct tracer_opt dummy_tracer_opt[] = {
{ }
};
-static struct tracer_flags dummy_tracer_flags = {
- .val = 0,
- .opts = dummy_tracer_opt
-};
-
static int
dummy_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
@@ -1258,12 +1253,22 @@ int __init register_tracer(struct tracer *type)
if (!type->set_flag)
type->set_flag = &dummy_set_flag;
- if (!type->flags)
- type->flags = &dummy_tracer_flags;
- else
+ if (!type->flags) {
+ /*allocate a dummy tracer_flags*/
+ type->flags = kmalloc(sizeof(*type->flags), GFP_KERNEL);
+ if (!type->flags) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ type->flags->val = 0;
+ type->flags->opts = dummy_tracer_opt;
+ } else
if (!type->flags->opts)
type->flags->opts = dummy_tracer_opt;
+ /* store the tracer for __set_tracer_option */
+ type->flags->trace = type;
+
ret = run_tracer_selftest(type);
if (ret < 0)
goto out;
@@ -1659,6 +1664,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
#else
TRACE_FLAG_IRQS_NOSUPPORT |
#endif
+ ((pc & NMI_MASK ) ? TRACE_FLAG_NMI : 0) |
((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) |
((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) |
(tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) |
@@ -3505,7 +3511,7 @@ static int __set_tracer_option(struct trace_array *tr,
struct tracer_flags *tracer_flags,
struct tracer_opt *opts, int neg)
{
- struct tracer *trace = tr->current_trace;
+ struct tracer *trace = tracer_flags->trace;
int ret;
ret = trace->set_flag(tr, tracer_flags->val, opts->bit, !neg);
@@ -4949,7 +4955,10 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
spd.nr_pages = i;
- ret = splice_to_pipe(pipe, &spd);
+ if (i)
+ ret = splice_to_pipe(pipe, &spd);
+ else
+ ret = 0;
out:
splice_shrink_spd(&spd);
return ret;
@@ -6391,11 +6400,8 @@ create_trace_option_files(struct trace_array *tr, struct tracer *tracer)
return;
for (i = 0; i < tr->nr_topts; i++) {
- /*
- * Check if these flags have already been added.
- * Some tracers share flags.
- */
- if (tr->topts[i].tracer->flags == tracer->flags)
+ /* Make sure there's no duplicate flags. */
+ if (WARN_ON_ONCE(tr->topts[i].tracer->flags == tracer->flags))
return;
}
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 8414fa40bf27..3fff4adfd431 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -125,6 +125,7 @@ enum trace_flag_type {
TRACE_FLAG_HARDIRQ = 0x08,
TRACE_FLAG_SOFTIRQ = 0x10,
TRACE_FLAG_PREEMPT_RESCHED = 0x20,
+ TRACE_FLAG_NMI = 0x40,
};
#define TRACE_BUF_SIZE 1024
@@ -345,6 +346,7 @@ struct tracer_opt {
struct tracer_flags {
u32 val;
struct tracer_opt *opts;
+ struct tracer *trace;
};
/* Makes more easy to define a tracer opt */
@@ -1111,6 +1113,18 @@ struct filter_pred {
unsigned short right;
};
+static inline bool is_string_field(struct ftrace_event_field *field)
+{
+ return field->filter_type == FILTER_DYN_STRING ||
+ field->filter_type == FILTER_STATIC_STRING ||
+ field->filter_type == FILTER_PTR_STRING;
+}
+
+static inline bool is_function_field(struct ftrace_event_field *field)
+{
+ return field->filter_type == FILTER_TRACE_FN;
+}
+
extern enum regex_type
filter_parse_regex(char *buff, int len, char **search, int *not);
extern void print_event_filter(struct trace_event_file *file,
@@ -1159,9 +1173,24 @@ struct event_trigger_data {
struct event_filter __rcu *filter;
char *filter_str;
void *private_data;
+ bool paused;
struct list_head list;
};
+extern void trigger_data_free(struct event_trigger_data *data);
+extern int event_trigger_init(struct event_trigger_ops *ops,
+ struct event_trigger_data *data);
+extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
+ int trigger_enable);
+extern void update_cond_flag(struct trace_event_file *file);
+extern void unregister_trigger(char *glob, struct event_trigger_ops *ops,
+ struct event_trigger_data *test,
+ struct trace_event_file *file);
+extern int set_trigger_filter(char *filter_str,
+ struct event_trigger_data *trigger_data,
+ struct trace_event_file *file);
+extern int register_event_command(struct event_command *cmd);
+
/**
* struct event_trigger_ops - callbacks for trace event triggers
*
@@ -1174,7 +1203,8 @@ struct event_trigger_data {
* @func: The trigger 'probe' function called when the triggering
* event occurs. The data passed into this callback is the data
* that was supplied to the event_command @reg() function that
- * registered the trigger (see struct event_command).
+ * registered the trigger (see struct event_command) along with
+ * the trace record, rec.
*
* @init: An optional initialization function called for the trigger
* when the trigger is registered (via the event_command reg()
@@ -1199,7 +1229,8 @@ struct event_trigger_data {
* (see trace_event_triggers.c).
*/
struct event_trigger_ops {
- void (*func)(struct event_trigger_data *data);
+ void (*func)(struct event_trigger_data *data,
+ void *rec);
int (*init)(struct event_trigger_ops *ops,
struct event_trigger_data *data);
void (*free)(struct event_trigger_ops *ops,
@@ -1243,27 +1274,10 @@ struct event_trigger_ops {
* values are defined by adding new values to the trigger_type
* enum in include/linux/trace_events.h.
*
- * @post_trigger: A flag that says whether or not this command needs
- * to have its action delayed until after the current event has
- * been closed. Some triggers need to avoid being invoked while
- * an event is currently in the process of being logged, since
- * the trigger may itself log data into the trace buffer. Thus
- * we make sure the current event is committed before invoking
- * those triggers. To do that, the trigger invocation is split
- * in two - the first part checks the filter using the current
- * trace record; if a command has the @post_trigger flag set, it
- * sets a bit for itself in the return value, otherwise it
- * directly invokes the trigger. Once all commands have been
- * either invoked or set their return flag, the current record is
- * either committed or discarded. At that point, if any commands
- * have deferred their triggers, those commands are finally
- * invoked following the close of the current event. In other
- * words, if the event_trigger_ops @func() probe implementation
- * itself logs to the trace buffer, this flag should be set,
- * otherwise it can be left unspecified.
+ * @flags: See the enum event_command_flags below.
*
- * All the methods below, except for @set_filter(), must be
- * implemented.
+ * All the methods below, except for @set_filter() and @unreg_all(),
+ * must be implemented.
*
* @func: The callback function responsible for parsing and
* registering the trigger written to the 'trigger' file by the
@@ -1288,6 +1302,10 @@ struct event_trigger_ops {
* This is usually implemented by the generic utility function
* @unregister_trigger() (see trace_event_triggers.c).
*
+ * @unreg_all: An optional function called to remove all the triggers
+ * from the list of triggers associated with the event. Called
+ * when a trigger file is opened in truncate mode.
+ *
* @set_filter: An optional function called to parse and set a filter
* for the trigger. If no @set_filter() method is set for the
* event command, filters set by the user for the command will be
@@ -1301,7 +1319,7 @@ struct event_command {
struct list_head list;
char *name;
enum event_trigger_type trigger_type;
- bool post_trigger;
+ int flags;
int (*func)(struct event_command *cmd_ops,
struct trace_event_file *file,
char *glob, char *cmd, char *params);
@@ -1313,12 +1331,56 @@ struct event_command {
struct event_trigger_ops *ops,
struct event_trigger_data *data,
struct trace_event_file *file);
+ void (*unreg_all)(struct trace_event_file *file);
int (*set_filter)(char *filter_str,
struct event_trigger_data *data,
struct trace_event_file *file);
struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
};
+/**
+ * enum event_command_flags - flags for struct event_command
+ *
+ * @POST_TRIGGER: A flag that says whether or not this command needs
+ * to have its action delayed until after the current event has
+ * been closed. Some triggers need to avoid being invoked while
+ * an event is currently in the process of being logged, since
+ * the trigger may itself log data into the trace buffer. Thus
+ * we make sure the current event is committed before invoking
+ * those triggers. To do that, the trigger invocation is split
+ * in two - the first part checks the filter using the current
+ * trace record; if a command has the @post_trigger flag set, it
+ * sets a bit for itself in the return value, otherwise it
+ * directly invokes the trigger. Once all commands have been
+ * either invoked or set their return flag, the current record is
+ * either committed or discarded. At that point, if any commands
+ * have deferred their triggers, those commands are finally
+ * invoked following the close of the current event. In other
+ * words, if the event_trigger_ops @func() probe implementation
+ * itself logs to the trace buffer, this flag should be set,
+ * otherwise it can be left unspecified.
+ *
+ * @NEEDS_REC: A flag that says whether or not this command needs
+ * access to the trace record in order to perform its function,
+ * regardless of whether or not it has a filter associated with
+ * it (filters make a trigger require access to the trace record
+ * but are not always present).
+ */
+enum event_command_flags {
+ EVENT_CMD_FL_POST_TRIGGER = 1,
+ EVENT_CMD_FL_NEEDS_REC = 2,
+};
+
+static inline bool event_command_post_trigger(struct event_command *cmd_ops)
+{
+ return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
+}
+
+static inline bool event_command_needs_rec(struct event_command *cmd_ops)
+{
+ return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
+}
+
extern int trace_event_enable_disable(struct trace_event_file *file,
int enable, int soft_disable);
extern int tracing_alloc_snapshot(void);
@@ -1365,8 +1427,13 @@ int perf_ftrace_event_register(struct trace_event_call *call,
#ifdef CONFIG_FTRACE_SYSCALLS
void init_ftrace_syscalls(void);
+const char *get_syscall_name(int syscall);
#else
static inline void init_ftrace_syscalls(void) { }
+static inline const char *get_syscall_name(int syscall)
+{
+ return NULL;
+}
#endif
#ifdef CONFIG_EVENT_TRACING
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 6816302542b2..b3f5051cd4e9 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -961,18 +961,6 @@ int filter_assign_type(const char *type)
return FILTER_OTHER;
}
-static bool is_function_field(struct ftrace_event_field *field)
-{
- return field->filter_type == FILTER_TRACE_FN;
-}
-
-static bool is_string_field(struct ftrace_event_field *field)
-{
- return field->filter_type == FILTER_DYN_STRING ||
- field->filter_type == FILTER_STATIC_STRING ||
- field->filter_type == FILTER_PTR_STRING;
-}
-
static bool is_legal_op(struct ftrace_event_field *field, int op)
{
if (is_string_field(field) &&
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index b38f617b6181..d67992f3bb0e 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -28,8 +28,7 @@
static LIST_HEAD(trigger_commands);
static DEFINE_MUTEX(trigger_cmd_mutex);
-static void
-trigger_data_free(struct event_trigger_data *data)
+void trigger_data_free(struct event_trigger_data *data)
{
if (data->cmd_ops->set_filter)
data->cmd_ops->set_filter(NULL, data, NULL);
@@ -73,18 +72,20 @@ event_triggers_call(struct trace_event_file *file, void *rec)
return tt;
list_for_each_entry_rcu(data, &file->triggers, list) {
+ if (data->paused)
+ continue;
if (!rec) {
- data->ops->func(data);
+ data->ops->func(data, rec);
continue;
}
filter = rcu_dereference_sched(data->filter);
if (filter && !filter_match_preds(filter, rec))
continue;
- if (data->cmd_ops->post_trigger) {
+ if (event_command_post_trigger(data->cmd_ops)) {
tt |= data->cmd_ops->trigger_type;
continue;
}
- data->ops->func(data);
+ data->ops->func(data, rec);
}
return tt;
}
@@ -94,6 +95,7 @@ EXPORT_SYMBOL_GPL(event_triggers_call);
* event_triggers_post_call - Call 'post_triggers' for a trace event
* @file: The trace_event_file associated with the event
* @tt: enum event_trigger_type containing a set bit for each trigger to invoke
+ * @rec: The trace entry for the event
*
* For each trigger associated with an event, invoke the trigger
* function registered with the associated trigger command, if the
@@ -104,13 +106,16 @@ EXPORT_SYMBOL_GPL(event_triggers_call);
*/
void
event_triggers_post_call(struct trace_event_file *file,
- enum event_trigger_type tt)
+ enum event_trigger_type tt,
+ void *rec)
{
struct event_trigger_data *data;
list_for_each_entry_rcu(data, &file->triggers, list) {
+ if (data->paused)
+ continue;
if (data->cmd_ops->trigger_type & tt)
- data->ops->func(data);
+ data->ops->func(data, rec);
}
}
EXPORT_SYMBOL_GPL(event_triggers_post_call);
@@ -188,6 +193,19 @@ static int event_trigger_regex_open(struct inode *inode, struct file *file)
return -ENODEV;
}
+ if ((file->f_mode & FMODE_WRITE) &&
+ (file->f_flags & O_TRUNC)) {
+ struct trace_event_file *event_file;
+ struct event_command *p;
+
+ event_file = event_file_data(file);
+
+ list_for_each_entry(p, &trigger_commands, list) {
+ if (p->unreg_all)
+ p->unreg_all(event_file);
+ }
+ }
+
if (file->f_mode & FMODE_READ) {
ret = seq_open(file, &event_triggers_seq_ops);
if (!ret) {
@@ -306,7 +324,7 @@ const struct file_operations event_trigger_fops = {
* Currently we only register event commands from __init, so mark this
* __init too.
*/
-static __init int register_event_command(struct event_command *cmd)
+__init int register_event_command(struct event_command *cmd)
{
struct event_command *p;
int ret = 0;
@@ -395,9 +413,8 @@ event_trigger_print(const char *name, struct seq_file *m,
*
* Return: 0 on success, errno otherwise
*/
-static int
-event_trigger_init(struct event_trigger_ops *ops,
- struct event_trigger_data *data)
+int event_trigger_init(struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
{
data->ref++;
return 0;
@@ -425,8 +442,8 @@ event_trigger_free(struct event_trigger_ops *ops,
trigger_data_free(data);
}
-static int trace_event_trigger_enable_disable(struct trace_event_file *file,
- int trigger_enable)
+int trace_event_trigger_enable_disable(struct trace_event_file *file,
+ int trigger_enable)
{
int ret = 0;
@@ -483,13 +500,14 @@ clear_event_triggers(struct trace_array *tr)
* its TRIGGER_COND bit set, otherwise the TRIGGER_COND bit should be
* cleared.
*/
-static void update_cond_flag(struct trace_event_file *file)
+void update_cond_flag(struct trace_event_file *file)
{
struct event_trigger_data *data;
bool set_cond = false;
list_for_each_entry_rcu(data, &file->triggers, list) {
- if (data->filter || data->cmd_ops->post_trigger) {
+ if (data->filter || event_command_post_trigger(data->cmd_ops) ||
+ event_command_needs_rec(data->cmd_ops)) {
set_cond = true;
break;
}
@@ -560,9 +578,9 @@ out:
* Usually used directly as the @unreg method in event command
* implementations.
*/
-static void unregister_trigger(char *glob, struct event_trigger_ops *ops,
- struct event_trigger_data *test,
- struct trace_event_file *file)
+void unregister_trigger(char *glob, struct event_trigger_ops *ops,
+ struct event_trigger_data *test,
+ struct trace_event_file *file)
{
struct event_trigger_data *data;
bool unregistered = false;
@@ -696,9 +714,9 @@ event_trigger_callback(struct event_command *cmd_ops,
*
* Return: 0 on success, errno otherwise
*/
-static int set_trigger_filter(char *filter_str,
- struct event_trigger_data *trigger_data,
- struct trace_event_file *file)
+int set_trigger_filter(char *filter_str,
+ struct event_trigger_data *trigger_data,
+ struct trace_event_file *file)
{
struct event_trigger_data *data = trigger_data;
struct event_filter *filter = NULL, *tmp;
@@ -747,7 +765,7 @@ static int set_trigger_filter(char *filter_str,
}
static void
-traceon_trigger(struct event_trigger_data *data)
+traceon_trigger(struct event_trigger_data *data, void *rec)
{
if (tracing_is_on())
return;
@@ -756,7 +774,7 @@ traceon_trigger(struct event_trigger_data *data)
}
static void
-traceon_count_trigger(struct event_trigger_data *data)
+traceon_count_trigger(struct event_trigger_data *data, void *rec)
{
if (tracing_is_on())
return;
@@ -771,7 +789,7 @@ traceon_count_trigger(struct event_trigger_data *data)
}
static void
-traceoff_trigger(struct event_trigger_data *data)
+traceoff_trigger(struct event_trigger_data *data, void *rec)
{
if (!tracing_is_on())
return;
@@ -780,7 +798,7 @@ traceoff_trigger(struct event_trigger_data *data)
}
static void
-traceoff_count_trigger(struct event_trigger_data *data)
+traceoff_count_trigger(struct event_trigger_data *data, void *rec)
{
if (!tracing_is_on())
return;
@@ -876,13 +894,13 @@ static struct event_command trigger_traceoff_cmd = {
#ifdef CONFIG_TRACER_SNAPSHOT
static void
-snapshot_trigger(struct event_trigger_data *data)
+snapshot_trigger(struct event_trigger_data *data, void *rec)
{
tracing_snapshot();
}
static void
-snapshot_count_trigger(struct event_trigger_data *data)
+snapshot_count_trigger(struct event_trigger_data *data, void *rec)
{
if (!data->count)
return;
@@ -890,7 +908,7 @@ snapshot_count_trigger(struct event_trigger_data *data)
if (data->count != -1)
(data->count)--;
- snapshot_trigger(data);
+ snapshot_trigger(data, rec);
}
static int
@@ -969,13 +987,13 @@ static __init int register_trigger_snapshot_cmd(void) { return 0; }
#define STACK_SKIP 3
static void
-stacktrace_trigger(struct event_trigger_data *data)
+stacktrace_trigger(struct event_trigger_data *data, void *rec)
{
trace_dump_stack(STACK_SKIP);
}
static void
-stacktrace_count_trigger(struct event_trigger_data *data)
+stacktrace_count_trigger(struct event_trigger_data *data, void *rec)
{
if (!data->count)
return;
@@ -983,7 +1001,7 @@ stacktrace_count_trigger(struct event_trigger_data *data)
if (data->count != -1)
(data->count)--;
- stacktrace_trigger(data);
+ stacktrace_trigger(data, rec);
}
static int
@@ -1017,7 +1035,7 @@ stacktrace_get_trigger_ops(char *cmd, char *param)
static struct event_command trigger_stacktrace_cmd = {
.name = "stacktrace",
.trigger_type = ETT_STACKTRACE,
- .post_trigger = true,
+ .flags = EVENT_CMD_FL_POST_TRIGGER,
.func = event_trigger_callback,
.reg = register_trigger,
.unreg = unregister_trigger,
@@ -1054,7 +1072,7 @@ struct enable_trigger_data {
};
static void
-event_enable_trigger(struct event_trigger_data *data)
+event_enable_trigger(struct event_trigger_data *data, void *rec)
{
struct enable_trigger_data *enable_data = data->private_data;
@@ -1065,7 +1083,7 @@ event_enable_trigger(struct event_trigger_data *data)
}
static void
-event_enable_count_trigger(struct event_trigger_data *data)
+event_enable_count_trigger(struct event_trigger_data *data, void *rec)
{
struct enable_trigger_data *enable_data = data->private_data;
@@ -1079,7 +1097,7 @@ event_enable_count_trigger(struct event_trigger_data *data)
if (data->count != -1)
(data->count)--;
- event_enable_trigger(data);
+ event_enable_trigger(data, rec);
}
static int
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index fcd41a166405..5a095c2e4b69 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -219,6 +219,8 @@ static void tracing_stop_function_trace(struct trace_array *tr)
unregister_ftrace_function(tr->ops);
}
+static struct tracer function_trace;
+
static int
func_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
@@ -228,6 +230,10 @@ func_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
if (!!set == !!(func_flags.val & TRACE_FUNC_OPT_STACK))
break;
+ /* We can change this flag when not running. */
+ if (tr->current_trace != &function_trace)
+ break;
+
unregister_ftrace_function(tr->ops);
if (set) {
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index e4e56589ec1d..03cdff84d026 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -109,8 +109,12 @@ static int func_prolog_dec(struct trace_array *tr,
return 0;
local_save_flags(*flags);
- /* slight chance to get a false positive on tracing_cpu */
- if (!irqs_disabled_flags(*flags))
+ /*
+ * Slight chance to get a false positive on tracing_cpu,
+ * although I'm starting to think there isn't a chance.
+ * Leave this for now just to be paranoid.
+ */
+ if (!irqs_disabled_flags(*flags) && !preempt_count())
return 0;
*data = per_cpu_ptr(tr->trace_buffer.data, cpu);
@@ -622,7 +626,6 @@ static int __irqsoff_tracer_init(struct trace_array *tr)
irqsoff_trace = tr;
/* make sure that the tracer is visible */
smp_wmb();
- tracing_reset_online_cpus(&tr->trace_buffer);
ftrace_init_array_ops(tr, irqsoff_tracer_call);
diff --git a/kernel/trace/trace_nop.c b/kernel/trace/trace_nop.c
index 8bb2071474dd..49f61fe96a6b 100644
--- a/kernel/trace/trace_nop.c
+++ b/kernel/trace/trace_nop.c
@@ -56,7 +56,7 @@ static void nop_trace_reset(struct trace_array *tr)
}
/* It only serves as a signal handler and a callback to
- * accept or refuse tthe setting of a flag.
+ * accept or refuse the setting of a flag.
* If you don't implement it, then the flag setting will be
* automatically accepted.
*/
@@ -75,7 +75,7 @@ static int nop_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
if (bit == TRACE_NOP_OPT_REFUSE) {
printk(KERN_DEBUG "nop_test_refuse flag set to %d: we refuse."
- "Now cat trace_options to see the result\n",
+ " Now cat trace_options to see the result\n",
set);
return -EINVAL;
}
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 282982195e09..0bb9cf2d53e6 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -389,7 +389,9 @@ int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
char irqs_off;
int hardirq;
int softirq;
+ int nmi;
+ nmi = entry->flags & TRACE_FLAG_NMI;
hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
@@ -415,10 +417,12 @@ int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
}
hardsoft_irq =
+ (nmi && hardirq) ? 'Z' :
+ nmi ? 'z' :
(hardirq && softirq) ? 'H' :
- hardirq ? 'h' :
- softirq ? 's' :
- '.';
+ hardirq ? 'h' :
+ softirq ? 's' :
+ '.' ;
trace_seq_printf(s, "%c%c%c",
irqs_off, need_resched, hardsoft_irq);
diff --git a/kernel/trace/trace_printk.c b/kernel/trace/trace_printk.c
index 060df67dbdd1..f96f0383f6c6 100644
--- a/kernel/trace/trace_printk.c
+++ b/kernel/trace/trace_printk.c
@@ -296,6 +296,9 @@ static int t_show(struct seq_file *m, void *v)
const char *str = *fmt;
int i;
+ if (!*fmt)
+ return 0;
+
seq_printf(m, "0x%lx : \"", *(unsigned long *)fmt);
/*
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index d1663083d903..e78f364cc192 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -106,6 +106,17 @@ static struct syscall_metadata *syscall_nr_to_meta(int nr)
return syscalls_metadata[nr];
}
+const char *get_syscall_name(int syscall)
+{
+ struct syscall_metadata *entry;
+
+ entry = syscall_nr_to_meta(syscall);
+ if (!entry)
+ return NULL;
+
+ return entry->name;
+}
+
static enum print_line_t
print_syscall_enter(struct trace_iterator *iter, int flags,
struct trace_event *event)