[PATCH v3 8/9] tracing: update event filters for multibuffer

From: Tom Zanussi
Date: Fri Jul 19 2013 - 11:10:35 EST

The trace event filters are still tied to event calls rather than
event files, which means you don't get what you'd expect when using
filters in the multibuffer case:

Before:

# echo 'count > 65536' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/filter
# cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/filter
count > 65536
# mkdir /sys/kernel/debug/tracing/instances/test1
# echo 'count > 4096' > /sys/kernel/debug/tracing/instances/test1/events/syscalls/sys_enter_read/filter
# cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/filter
count > 4096

Setting the filter in tracing/instances/test1/events shouldn't affect
the same event in tracing/events as it does above.

After:

# echo 'count > 65536' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/filter
# cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/filter
count > 65536
# mkdir /sys/kernel/debug/tracing/instances/test1
# echo 'count > 4096' > /sys/kernel/debug/tracing/instances/test1/events/syscalls/sys_enter_read/filter
# cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/filter
count > 65536

We'd like to just move the filter directly from ftrace_event_call to
ftrace_event_file, but there are a couple cases that don't yet have
multibuffer support and therefore have to continue using the current
event_call-based filters. For those cases, a new USE_CALL_FILTER bit
is added to the event_call flags, whose main purpose is to keep the
old behavioir for those cases until they can be updated with
multibuffer support; at that point, the USE_CALL_FILTER flag (and the
new associated call_filter_check_discard() function) can go away.

The multibuffer support also made filter_current_check_discard()
redundant, so this change removes that function as well and replaces
it with filter_check_discard() (or call_filter_check_discard() as
appropriate).

Signed-off-by: Tom Zanussi <tom.zanussi@xxxxxxxxxxxxxxx>
---
include/linux/ftrace_event.h | 37 ++++++--
include/trace/ftrace.h | 6 +-
kernel/trace/trace.c | 18 ++--
kernel/trace/trace.h | 10 +--
kernel/trace/trace_branch.c | 2 +-
kernel/trace/trace_events.c | 16 ++--
kernel/trace/trace_events_filter.c | 166 +++++++++++++++++++++++++++--------
kernel/trace/trace_export.c | 2 +-
kernel/trace/trace_functions_graph.c | 4 +-
kernel/trace/trace_kprobe.c | 4 +-
kernel/trace/trace_mmiotrace.c | 4 +-
kernel/trace/trace_sched_switch.c | 4 +-
kernel/trace/trace_syscalls.c | 8 +-
kernel/trace/trace_uprobe.c | 3 +-
14 files changed, 193 insertions(+), 91 deletions(-)

diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index f0c6e80..00c8a5e 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -200,6 +200,7 @@ enum {
TRACE_EVENT_FL_NO_SET_FILTER_BIT,
TRACE_EVENT_FL_IGNORE_ENABLE_BIT,
TRACE_EVENT_FL_WAS_ENABLED_BIT,
+ TRACE_EVENT_FL_USE_CALL_FILTER_BIT,
};

/*
@@ -211,6 +212,7 @@ enum {
* WAS_ENABLED - Set and stays set when an event was ever enabled
* (used for module unloading, if a module event is enabled,
* it is best to clear the buffers that used it).
+ * USE_CALL_FILTER - For ftrace internal events, don't use file filter
*/
enum {
TRACE_EVENT_FL_FILTERED = (1 << TRACE_EVENT_FL_FILTERED_BIT),
@@ -218,6 +220,7 @@ enum {
TRACE_EVENT_FL_NO_SET_FILTER = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
TRACE_EVENT_FL_IGNORE_ENABLE = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT),
TRACE_EVENT_FL_WAS_ENABLED = (1 << TRACE_EVENT_FL_WAS_ENABLED_BIT),
+ TRACE_EVENT_FL_USE_CALL_FILTER = (1 << TRACE_EVENT_FL_USE_CALL_FILTER_BIT),
};

struct ftrace_event_call {
@@ -236,6 +239,7 @@ struct ftrace_event_call {
* bit 2: failed to apply filter
* bit 3: ftrace internal event (do not enable)
* bit 4: Event was enabled by module
+ * bit 5: use call filter rather than file filter
*/
int flags; /* static flags of different events */

@@ -251,6 +255,8 @@ struct ftrace_subsystem_dir;
enum {
FTRACE_EVENT_FL_ENABLED_BIT,
FTRACE_EVENT_FL_RECORDED_CMD_BIT,
+ FTRACE_EVENT_FL_FILTERED_BIT,
+ FTRACE_EVENT_FL_NO_SET_FILTER_BIT,
FTRACE_EVENT_FL_SOFT_MODE_BIT,
FTRACE_EVENT_FL_SOFT_DISABLED_BIT,
FTRACE_EVENT_FL_TRIGGER_MODE_BIT,
@@ -260,6 +266,8 @@ enum {
* Ftrace event file flags:
* ENABLED - The event is enabled
* RECORDED_CMD - The comms should be recorded at sched_switch
+ * FILTERED - The event has a filter attached
+ * NO_SET_FILTER - Set when filter has error and is to be ignored
* SOFT_MODE - The event is enabled/disabled by SOFT_DISABLED
* SOFT_DISABLED - When set, do not trace the event (even though its
* tracepoint may be enabled)
@@ -268,6 +276,8 @@ enum {
enum {
FTRACE_EVENT_FL_ENABLED = (1 << FTRACE_EVENT_FL_ENABLED_BIT),
FTRACE_EVENT_FL_RECORDED_CMD = (1 << FTRACE_EVENT_FL_RECORDED_CMD_BIT),
+ FTRACE_EVENT_FL_FILTERED = (1 << FTRACE_EVENT_FL_FILTERED_BIT),
+ FTRACE_EVENT_FL_NO_SET_FILTER = (1 << FTRACE_EVENT_FL_NO_SET_FILTER_BIT),
FTRACE_EVENT_FL_SOFT_MODE = (1 << FTRACE_EVENT_FL_SOFT_MODE_BIT),
FTRACE_EVENT_FL_SOFT_DISABLED = (1 << FTRACE_EVENT_FL_SOFT_DISABLED_BIT),
FTRACE_EVENT_FL_TRIGGER_MODE = (1 << FTRACE_EVENT_FL_TRIGGER_MODE_BIT),
@@ -276,6 +286,7 @@ enum {
struct ftrace_event_file {
struct list_head list;
struct ftrace_event_call *event_call;
+ struct event_filter *filter;
struct dentry *dir;
struct trace_array *tr;
struct ftrace_subsystem_dir *system;
@@ -286,8 +297,10 @@ struct ftrace_event_file {
* bit 0: enabled
* bit 1: enabled cmd record
* bit 2: enable/disable with the soft disable bit
- * bit 3: soft disabled
- * bit 4: trigger enabled
+ * bit 3: filter_active
+ * bit 4: failed to apply filter
+ * bit 5: soft disabled
+ * bit 6: trigger enabled
*
* Note: The bits must be set atomically to prevent races
* from other writers. Reads of flags do not need to be in
@@ -322,17 +335,27 @@ enum trigger_mode {
TM_EVENT_ENABLE = (1 << 3),
};

-extern void destroy_preds(struct ftrace_event_call *call);
+extern void destroy_preds(struct ftrace_event_file *file);
+extern void destroy_call_preds(struct ftrace_event_call *call);
extern int filter_match_preds(struct event_filter *filter, void *rec);
-extern int filter_current_check_discard(struct ring_buffer *buffer,
- struct ftrace_event_call *call,
- void *rec,
- struct ring_buffer_event *event);
extern enum trigger_mode event_triggers_call(struct ftrace_event_file *file,
void *rec);
extern void event_triggers_post_call(struct ftrace_event_file *file,
enum trigger_mode tm);

+static inline int
+filter_check_discard(struct ftrace_event_file *file, void *rec,
+ struct ring_buffer *buffer,
+ struct ring_buffer_event *event)
+{
+ if (unlikely(file->flags & FTRACE_EVENT_FL_FILTERED) &&
+ !filter_match_preds(file->filter, rec)) {
+ ring_buffer_discard_commit(buffer, event);
+ return 1;
+ }
+
+ return 0;
+}

enum {
FILTER_OTHER = 0,
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 311f38e..7eff632 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -446,8 +446,7 @@ static inline notrace int ftrace_get_offsets_##call( \
* if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT,
* &ftrace_file->flags))
* ring_buffer_discard_commit(buffer, event);
- * else if (!filter_current_check_discard(buffer, event_call,
- * entry, event))
+ * else if (!filter_check_discard(ftrace_file, entry, buffer, event))
* trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
*
* if (__tm)
@@ -568,8 +567,7 @@ ftrace_raw_event_##call(void *__data, proto) \
if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, \
&ftrace_file->flags)) \
ring_buffer_discard_commit(buffer, event); \
- else if (!filter_current_check_discard(buffer, event_call, \
- entry, event)) \
+ else if (!filter_check_discard(ftrace_file, entry, buffer, event)) \
trace_buffer_unlock_commit(buffer, event, irq_flags, pc); \
\
if (__tm) \
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 2997d61..4e2a70f 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -235,14 +235,6 @@ void trace_array_put(struct trace_array *this_tr)
mutex_unlock(&trace_types_lock);
}

-int filter_current_check_discard(struct ring_buffer *buffer,
- struct ftrace_event_call *call, void *rec,
- struct ring_buffer_event *event)
-{
- return filter_check_discard(call, rec, buffer, event);
-}
-EXPORT_SYMBOL_GPL(filter_current_check_discard);
-
cycle_t ftrace_now(int cpu)
{
u64 ts;
@@ -1631,7 +1623,7 @@ trace_function(struct trace_array *tr,
entry->ip = ip;
entry->parent_ip = parent_ip;

- if (!filter_check_discard(call, entry, buffer, event))
+ if (!call_filter_check_discard(call, entry, buffer, event))
__buffer_unlock_commit(buffer, event);
}

@@ -1715,7 +1707,7 @@ static void __ftrace_trace_stack(struct ring_buffer *buffer,

entry->size = trace.nr_entries;

- if (!filter_check_discard(call, entry, buffer, event))
+ if (!call_filter_check_discard(call, entry, buffer, event))
__buffer_unlock_commit(buffer, event);

out:
@@ -1817,7 +1809,7 @@ ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, int pc)
trace.entries = entry->caller;

save_stack_trace_user(&trace);
- if (!filter_check_discard(call, entry, buffer, event))
+ if (!call_filter_check_discard(call, entry, buffer, event))
__buffer_unlock_commit(buffer, event);

out_drop_count:
@@ -2009,7 +2001,7 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
entry->fmt = fmt;

memcpy(entry->buf, tbuffer, sizeof(u32) * len);
- if (!filter_check_discard(call, entry, buffer, event)) {
+ if (!call_filter_check_discard(call, entry, buffer, event)) {
__buffer_unlock_commit(buffer, event);
ftrace_trace_stack(buffer, flags, 6, pc);
}
@@ -2064,7 +2056,7 @@ __trace_array_vprintk(struct ring_buffer *buffer,

memcpy(&entry->buf, tbuffer, len);
entry->buf[len] = '\0';
- if (!filter_check_discard(call, entry, buffer, event)) {
+ if (!call_filter_check_discard(call, entry, buffer, event)) {
__buffer_unlock_commit(buffer, event);
ftrace_trace_stack(buffer, flags, 6, pc);
}
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 8597592..2bcf37a 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -987,9 +987,9 @@ struct filter_pred {

extern enum regex_type
filter_parse_regex(char *buff, int len, char **search, int *not);
-extern void print_event_filter(struct ftrace_event_call *call,
+extern void print_event_filter(struct ftrace_event_file *file,
struct trace_seq *s);
-extern int apply_event_filter(struct ftrace_event_call *call,
+extern int apply_event_filter(struct ftrace_event_file *file,
char *filter_string);
extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir,
char *filter_string);
@@ -1005,9 +1005,9 @@ struct ftrace_event_field *
trace_find_event_field(struct ftrace_event_call *call, char *name);

static inline int
-filter_check_discard(struct ftrace_event_call *call, void *rec,
- struct ring_buffer *buffer,
- struct ring_buffer_event *event)
+call_filter_check_discard(struct ftrace_event_call *call, void *rec,
+ struct ring_buffer *buffer,
+ struct ring_buffer_event *event)
{
if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
!filter_match_preds(call->filter, rec)) {
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
index d594da0..697fb9b 100644
--- a/kernel/trace/trace_branch.c
+++ b/kernel/trace/trace_branch.c
@@ -78,7 +78,7 @@ probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
entry->line = f->line;
entry->correct = val == expect;

- if (!filter_check_discard(call, entry, buffer, event))
+ if (!call_filter_check_discard(call, entry, buffer, event))
__buffer_unlock_commit(buffer, event);

out:
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 8ac5ce0..9493e67 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -992,7 +992,7 @@ static ssize_t
event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
loff_t *ppos)
{
- struct ftrace_event_call *call = filp->private_data;
+ struct ftrace_event_file *file = filp->private_data;
struct trace_seq *s;
int r;

@@ -1005,7 +1005,7 @@ event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,

trace_seq_init(s);

- print_event_filter(call, s);
+ print_event_filter(file, s);
r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);

kfree(s);
@@ -1017,7 +1017,7 @@ static ssize_t
event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
loff_t *ppos)
{
- struct ftrace_event_call *call = filp->private_data;
+ struct ftrace_event_file *file = filp->private_data;
char *buf;
int err;

@@ -1034,7 +1034,7 @@ event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
}
buf[cnt] = '\0';

- err = apply_event_filter(call, buf);
+ err = apply_event_filter(file, buf);
free_page((unsigned long) buf);
if (err < 0)
return err;
@@ -1520,7 +1520,7 @@ event_create_dir(struct dentry *parent,
return -1;
}
}
- trace_create_file("filter", 0644, file->dir, call,
+ trace_create_file("filter", 0644, file->dir, file,
filter);

trace_create_file("trigger", 0644, file->dir, file,
@@ -1578,6 +1578,10 @@ static void event_remove(struct ftrace_event_call *call)
if (file->event_call != call)
continue;
ftrace_event_enable_disable(file, 0);
+ if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER)
+ destroy_call_preds(call);
+ else
+ destroy_preds(file);
/*
* The do_for_each_event_file() is
* a double loop. After finding the call for this
@@ -1711,7 +1715,7 @@ static void __trace_remove_event_call(struct ftrace_event_call *call)
{
event_remove(call);
trace_destroy_fields(call);
- destroy_preds(call);
+ destroy_call_preds(call);
}

/* Remove an event_call */
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 6cf2cef..edd5e97 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -637,12 +637,15 @@ static void append_filter_err(struct filter_parse_state *ps,
free_page((unsigned long) buf);
}

-void print_event_filter(struct ftrace_event_call *call, struct trace_seq *s)
+void print_event_filter(struct ftrace_event_file *file, struct trace_seq *s)
{
struct event_filter *filter;

mutex_lock(&event_mutex);
- filter = call->filter;
+ if (file->event_call->flags & TRACE_EVENT_FL_USE_CALL_FILTER)
+ filter = file->event_call->filter;
+ else
+ filter = file->filter;
if (filter && filter->filter_string)
trace_seq_printf(s, "%s\n", filter->filter_string);
else
@@ -768,7 +771,12 @@ static void __free_preds(struct event_filter *filter)
filter->n_preds = 0;
}

-static void filter_disable(struct ftrace_event_call *call)
+static void filter_disable(struct ftrace_event_file *file)
+{
+ file->flags &= ~FTRACE_EVENT_FL_FILTERED;
+}
+
+static void call_filter_disable(struct ftrace_event_call *call)
{
call->flags &= ~TRACE_EVENT_FL_FILTERED;
}
@@ -789,12 +797,24 @@ void free_event_filter(struct event_filter *filter)
}

/*
+ * Called when destroying the ftrace_event_file.
+ * The file is being freed, so we do not need to worry about
+ * the file being currently used. This is for module code removing
+ * the tracepoints from within it.
+ */
+void destroy_preds(struct ftrace_event_file *file)
+{
+ __free_filter(file->filter);
+ file->filter = NULL;
+}
+
+/*
* Called when destroying the ftrace_event_call.
* The call is being freed, so we do not need to worry about
* the call being currently used. This is for module code removing
* the tracepoints from within it.
*/
-void destroy_preds(struct ftrace_event_call *call)
+void destroy_call_preds(struct ftrace_event_call *call)
{
__free_filter(call->filter);
call->filter = NULL;
@@ -832,28 +852,44 @@ static int __alloc_preds(struct event_filter *filter, int n_preds)
return 0;
}

-static void filter_free_subsystem_preds(struct event_subsystem *system)
+static void filter_free_subsystem_preds(struct event_subsystem *system,
+ struct trace_array *tr)
{
+ struct ftrace_event_file *file;
struct ftrace_event_call *call;

- list_for_each_entry(call, &ftrace_events, list) {
+ list_for_each_entry(file, &tr->events, list) {
+ call = file->event_call;
if (strcmp(call->class->system, system->name) != 0)
continue;

- filter_disable(call);
- remove_filter_string(call->filter);
+ if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) {
+ call_filter_disable(call);
+ remove_filter_string(call->filter);
+ } else {
+ filter_disable(file);
+ remove_filter_string(file->filter);
+ }
}
}

-static void filter_free_subsystem_filters(struct event_subsystem *system)
+static void filter_free_subsystem_filters(struct event_subsystem *system,
+ struct trace_array *tr)
{
+ struct ftrace_event_file *file;
struct ftrace_event_call *call;

- list_for_each_entry(call, &ftrace_events, list) {
+ list_for_each_entry(file, &tr->events, list) {
+ call = file->event_call;
if (strcmp(call->class->system, system->name) != 0)
continue;
- __free_filter(call->filter);
- call->filter = NULL;
+ if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) {
+ __free_filter(call->filter);
+ call->filter = NULL;
+ } else {
+ __free_filter(file->filter);
+ file->filter = NULL;
+ }
}
}

@@ -1630,9 +1666,11 @@ struct filter_list {
};

static int replace_system_preds(struct event_subsystem *system,
+ struct trace_array *tr,
struct filter_parse_state *ps,
char *filter_string)
{
+ struct ftrace_event_file *file;
struct ftrace_event_call *call;
struct filter_list *filter_item;
struct filter_list *tmp;
@@ -1640,8 +1678,8 @@ static int replace_system_preds(struct event_subsystem *system,
bool fail = true;
int err;

- list_for_each_entry(call, &ftrace_events, list) {
-
+ list_for_each_entry(file, &tr->events, list) {
+ call = file->event_call;
if (strcmp(call->class->system, system->name) != 0)
continue;

@@ -1650,21 +1688,34 @@ static int replace_system_preds(struct event_subsystem *system,
* (filter arg is ignored on dry_run)
*/
err = replace_preds(call, NULL, ps, filter_string, true);
- if (err)
- call->flags |= TRACE_EVENT_FL_NO_SET_FILTER;
- else
- call->flags &= ~TRACE_EVENT_FL_NO_SET_FILTER;
+ if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) {
+ if (err)
+ call->flags |= TRACE_EVENT_FL_NO_SET_FILTER;
+ else
+ call->flags &= ~TRACE_EVENT_FL_NO_SET_FILTER;
+ } else {
+ if (err)
+ file->flags |= FTRACE_EVENT_FL_NO_SET_FILTER;
+ else
+ file->flags &= ~FTRACE_EVENT_FL_NO_SET_FILTER;
+ }
}

- list_for_each_entry(call, &ftrace_events, list) {
+ list_for_each_entry(file, &tr->events, list) {
struct event_filter *filter;

+ call = file->event_call;
+
if (strcmp(call->class->system, system->name) != 0)
continue;

- if (call->flags & TRACE_EVENT_FL_NO_SET_FILTER)
+ if (file->flags & FTRACE_EVENT_FL_NO_SET_FILTER)
continue;

+ if ((call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) &&
+ (call->flags & TRACE_EVENT_FL_NO_SET_FILTER))
+ continue;
+
filter_item = kzalloc(sizeof(*filter_item), GFP_KERNEL);
if (!filter_item)
goto fail_mem;
@@ -1683,17 +1734,29 @@ static int replace_system_preds(struct event_subsystem *system,

err = replace_preds(call, filter, ps, filter_string, false);
if (err) {
- filter_disable(call);
+ if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER)
+ call_filter_disable(call);
+ else
+ filter_disable(file);
parse_error(ps, FILT_ERR_BAD_SUBSYS_FILTER, 0);
append_filter_err(ps, filter);
- } else
- call->flags |= TRACE_EVENT_FL_FILTERED;
+ } else {
+ if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER)
+ call->flags |= TRACE_EVENT_FL_FILTERED;
+ else
+ file->flags |= FTRACE_EVENT_FL_FILTERED;
+ }
/*
* Regardless of if this returned an error, we still
* replace the filter for the call.
*/
- filter = call->filter;
- rcu_assign_pointer(call->filter, filter_item->filter);
+ if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) {
+ filter = call->filter;
+ rcu_assign_pointer(call->filter, filter_item->filter);
+ } else {
+ filter = file->filter;
+ rcu_assign_pointer(file->filter, filter_item->filter);
+ }
filter_item->filter = filter;

fail = false;
@@ -1831,6 +1894,7 @@ int create_event_filter(struct ftrace_event_call *call,
* and always remembers @filter_str.
*/
static int create_system_filter(struct event_subsystem *system,
+ struct trace_array *tr,
char *filter_str, struct event_filter **filterp)
{
struct event_filter *filter = NULL;
@@ -1839,7 +1903,7 @@ static int create_system_filter(struct event_subsystem *system,

err = create_filter_start(filter_str, true, &ps, &filter);
if (!err) {
- err = replace_system_preds(system, ps, filter_str);
+ err = replace_system_preds(system, tr, ps, filter_str);
if (!err) {
/* System filters just show a default message */
kfree(filter->filter_string);
@@ -1854,19 +1918,31 @@ static int create_system_filter(struct event_subsystem *system,
return err;
}

-int apply_event_filter(struct ftrace_event_call *call, char *filter_string)
+int apply_event_filter(struct ftrace_event_file *file, char *filter_string)
{
+ struct ftrace_event_call *call = file->event_call;
struct event_filter *filter;
+ bool use_call_filter;
int err = 0;

+ use_call_filter = call->flags & TRACE_EVENT_FL_USE_CALL_FILTER;
+
mutex_lock(&event_mutex);

if (!strcmp(strstrip(filter_string), "0")) {
- filter_disable(call);
- filter = call->filter;
+ if (use_call_filter) {
+ call_filter_disable(call);
+ filter = call->filter;
+ } else {
+ filter_disable(file);
+ filter = file->filter;
+ }
if (!filter)
goto out_unlock;
- RCU_INIT_POINTER(call->filter, NULL);
+ if (use_call_filter)
+ RCU_INIT_POINTER(call->filter, NULL);
+ else
+ RCU_INIT_POINTER(file->filter, NULL);
/* Make sure the filter is not being used */
synchronize_sched();
__free_filter(filter);
@@ -1882,14 +1958,25 @@ int apply_event_filter(struct ftrace_event_call *call, char *filter_string)
* string
*/
if (filter) {
- struct event_filter *tmp = call->filter;
+ struct event_filter *tmp;

- if (!err)
- call->flags |= TRACE_EVENT_FL_FILTERED;
- else
- filter_disable(call);
+ if (use_call_filter) {
+ tmp = call->filter;
+ if (!err)
+ call->flags |= TRACE_EVENT_FL_FILTERED;
+ else
+ call_filter_disable(call);
+
+ rcu_assign_pointer(call->filter, filter);
+ } else {
+ tmp = file->filter;
+ if (!err)
+ file->flags |= FTRACE_EVENT_FL_FILTERED;
+ else
+ filter_disable(file);

- rcu_assign_pointer(call->filter, filter);
+ rcu_assign_pointer(file->filter, filter);
+ }

if (tmp) {
/* Make sure the call is done with the filter */
@@ -1907,6 +1994,7 @@ int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir,
char *filter_string)
{
struct event_subsystem *system = dir->subsystem;
+ struct trace_array *tr = dir->tr;
struct event_filter *filter;
int err = 0;

@@ -1919,18 +2007,18 @@ int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir,
}

if (!strcmp(strstrip(filter_string), "0")) {
- filter_free_subsystem_preds(system);
+ filter_free_subsystem_preds(system, tr);
remove_filter_string(system->filter);
filter = system->filter;
system->filter = NULL;
/* Ensure all filters are no longer used */
synchronize_sched();
- filter_free_subsystem_filters(system);
+ filter_free_subsystem_filters(system, tr);
__free_filter(filter);
goto out_unlock;
}

- err = create_system_filter(system, filter_string, &filter);
+ err = create_system_filter(system, tr, filter_string, &filter);
if (filter) {
/*
* No event actually uses the system filter
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index d21a746..7c3e3e7 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -180,7 +180,7 @@ struct ftrace_event_call __used event_##call = { \
.event.type = etype, \
.class = &event_class_ftrace_##call, \
.print_fmt = print, \
- .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \
+ .flags = TRACE_EVENT_FL_IGNORE_ENABLE | TRACE_EVENT_FL_USE_CALL_FILTER, \
}; \
struct ftrace_event_call __used \
__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 8388bc9..1500aeb 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -230,7 +230,7 @@ int __trace_graph_entry(struct trace_array *tr,
return 0;
entry = ring_buffer_event_data(event);
entry->graph_ent = *trace;
- if (!filter_current_check_discard(buffer, call, entry, event))
+ if (!call_filter_check_discard(call, entry, buffer, event))
__buffer_unlock_commit(buffer, event);

return 1;
@@ -335,7 +335,7 @@ void __trace_graph_return(struct trace_array *tr,
return;
entry = ring_buffer_event_data(event);
entry->ret = *trace;
- if (!filter_current_check_discard(buffer, call, entry, event))
+ if (!call_filter_check_discard(call, entry, buffer, event))
__buffer_unlock_commit(buffer, event);
}

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 7ed6976..60180ad 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -819,7 +819,7 @@ __kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs,
entry->ip = (unsigned long)tp->rp.kp.addr;
store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);

- if (!filter_current_check_discard(buffer, call, entry, event))
+ if (!filter_check_discard(ftrace_file, entry, buffer, event))
trace_buffer_unlock_commit_regs(buffer, event,
irq_flags, pc, regs);
}
@@ -868,7 +868,7 @@ __kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri,
entry->ret_ip = (unsigned long)ri->ret_addr;
store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);

- if (!filter_current_check_discard(buffer, call, entry, event))
+ if (!filter_check_discard(ftrace_file, entry, buffer, event))
trace_buffer_unlock_commit_regs(buffer, event,
irq_flags, pc, regs);
}
diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
index a5e8f48..4f06ac0 100644
--- a/kernel/trace/trace_mmiotrace.c
+++ b/kernel/trace/trace_mmiotrace.c
@@ -323,7 +323,7 @@ static void __trace_mmiotrace_rw(struct trace_array *tr,
entry = ring_buffer_event_data(event);
entry->rw = *rw;

- if (!filter_check_discard(call, entry, buffer, event))
+ if (!call_filter_check_discard(call, entry, buffer, event))
trace_buffer_unlock_commit(buffer, event, 0, pc);
}

@@ -353,7 +353,7 @@ static void __trace_mmiotrace_map(struct trace_array *tr,
entry = ring_buffer_event_data(event);
entry->map = *map;

- if (!filter_check_discard(call, entry, buffer, event))
+ if (!call_filter_check_discard(call, entry, buffer, event))
trace_buffer_unlock_commit(buffer, event, 0, pc);
}

diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index 4e98e3b..3f34dc9 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -45,7 +45,7 @@ tracing_sched_switch_trace(struct trace_array *tr,
entry->next_state = next->state;
entry->next_cpu = task_cpu(next);

- if (!filter_check_discard(call, entry, buffer, event))
+ if (!call_filter_check_discard(call, entry, buffer, event))
trace_buffer_unlock_commit(buffer, event, flags, pc);
}

@@ -101,7 +101,7 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
entry->next_state = wakee->state;
entry->next_cpu = task_cpu(wakee);

- if (!filter_check_discard(call, entry, buffer, event))
+ if (!call_filter_check_discard(call, entry, buffer, event))
trace_buffer_unlock_commit(buffer, event, flags, pc);
}

diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 609190b..516df72 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -324,11 +324,9 @@ static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
(FTRACE_EVENT_FL_SOFT_DISABLED | FTRACE_EVENT_FL_TRIGGER_MODE)) ==
FTRACE_EVENT_FL_SOFT_DISABLED)
return;
-
sys_data = syscall_nr_to_meta(syscall_nr);
if (!sys_data)
return;
-
size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args;

local_save_flags(irq_flags);
@@ -349,8 +347,7 @@ static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)

if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags))
ring_buffer_discard_commit(buffer, event);
- else if (!filter_current_check_discard(buffer, sys_data->enter_event,
- entry, event))
+ else if (!filter_check_discard(ftrace_file, entry, buffer, event))
trace_current_buffer_unlock_commit(buffer, event,
irq_flags, pc);
if (__tm)
@@ -405,8 +402,7 @@ static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)

if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags))
ring_buffer_discard_commit(buffer, event);
- else if (!filter_current_check_discard(buffer, sys_data->exit_event,
- entry, event))
+ else if (!filter_check_discard(ftrace_file, entry, buffer, event))
trace_current_buffer_unlock_commit(buffer, event,
irq_flags, pc);
if (__tm)
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index d5d0cd3..df1eb12 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -128,6 +128,7 @@ alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
if (is_ret)
tu->consumer.ret_handler = uretprobe_dispatcher;
init_trace_uprobe_filter(&tu->filter);
+ tu->call.flags |= TRACE_EVENT_FL_USE_CALL_FILTER;
return tu;

error:
@@ -541,7 +542,7 @@ static void uprobe_trace_print(struct trace_uprobe *tu,
for (i = 0; i < tu->nr_args; i++)
call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset);

- if (!filter_current_check_discard(buffer, call, entry, event))
+ if (!call_filter_check_discard(call, entry, buffer, event))
trace_buffer_unlock_commit(buffer, event, 0, 0);
}

--
1.7.11.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/