[PATCH v2] tracing/filters: use ring_buffer_discard_commit() infilter_check_discard()
From: Tom Zanussi
Date: Wed Apr 08 2009 - 04:22:14 EST
This patch changes filter_check_discard() to make use of the new
ring_buffer_discard_commit() function and modifies the current users to
call the old commit function in the non-discard case. It also
introduces a version of filter_check_discard() that uses the global
trace buffer (filter_current_check_discard()) for those cases.
v2 changes:
- fix compile error noticed by Ingo Molnar
Signed-off-by: Tom Zanussi <tzanussi@xxxxxxxxx>
---
kernel/trace/kmemtrace.c | 10 +++----
kernel/trace/trace.c | 45 ++++++++++++++++++----------------
kernel/trace/trace.h | 14 ++++++++--
kernel/trace/trace_branch.c | 5 +--
kernel/trace/trace_events_stage_3.h | 5 +---
kernel/trace/trace_hw_branches.c | 4 +-
kernel/trace/trace_power.c | 8 +++---
7 files changed, 48 insertions(+), 43 deletions(-)
diff --git a/kernel/trace/kmemtrace.c b/kernel/trace/kmemtrace.c
index 65aba48..91cd0a5 100644
--- a/kernel/trace/kmemtrace.c
+++ b/kernel/trace/kmemtrace.c
@@ -63,9 +63,8 @@ static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
entry->gfp_flags = gfp_flags;
entry->node = node;
- filter_check_discard(call, entry, event);
-
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
trace_wake_up();
}
@@ -90,9 +89,8 @@ static inline void kmemtrace_free(enum kmemtrace_type_id type_id,
entry->call_site = call_site;
entry->ptr = ptr;
- filter_check_discard(call, entry, event);
-
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
trace_wake_up();
}
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ba9cc8f..289dcf3 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -171,6 +171,12 @@ static struct trace_array global_trace;
static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu);
+int filter_current_check_discard(struct ftrace_event_call *call, void *rec,
+ struct ring_buffer_event *event)
+{
+ return filter_check_discard(call, rec, global_trace.buffer, event);
+}
+
cycle_t ftrace_now(int cpu)
{
u64 ts;
@@ -919,9 +925,8 @@ trace_function(struct trace_array *tr,
entry->ip = ip;
entry->parent_ip = parent_ip;
- filter_check_discard(call, entry, event);
-
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
}
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
@@ -943,8 +948,8 @@ static int __trace_graph_entry(struct trace_array *tr,
return 0;
entry = ring_buffer_event_data(event);
entry->graph_ent = *trace;
- filter_check_discard(call, entry, event);
- ring_buffer_unlock_commit(global_trace.buffer, event);
+ if (!filter_current_check_discard(call, entry, event))
+ ring_buffer_unlock_commit(global_trace.buffer, event);
return 1;
}
@@ -967,8 +972,8 @@ static void __trace_graph_return(struct trace_array *tr,
return;
entry = ring_buffer_event_data(event);
entry->ret = *trace;
- filter_check_discard(call, entry, event);
- ring_buffer_unlock_commit(global_trace.buffer, event);
+ if (!filter_current_check_discard(call, entry, event))
+ ring_buffer_unlock_commit(global_trace.buffer, event);
}
#endif
@@ -1004,8 +1009,8 @@ static void __ftrace_trace_stack(struct trace_array *tr,
trace.entries = entry->caller;
save_stack_trace(&trace);
- filter_check_discard(call, entry, event);
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
#endif
}
@@ -1052,8 +1057,8 @@ static void ftrace_trace_userstack(struct trace_array *tr,
trace.entries = entry->caller;
save_stack_trace_user(&trace);
- filter_check_discard(call, entry, event);
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
#endif
}
@@ -1114,9 +1119,8 @@ tracing_sched_switch_trace(struct trace_array *tr,
entry->next_state = next->state;
entry->next_cpu = task_cpu(next);
- filter_check_discard(call, entry, event);
-
- trace_buffer_unlock_commit(tr, event, flags, pc);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ trace_buffer_unlock_commit(tr, event, flags, pc);
}
void
@@ -1142,9 +1146,8 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
entry->next_state = wakee->state;
entry->next_cpu = task_cpu(wakee);
- filter_check_discard(call, entry, event);
-
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
ftrace_trace_stack(tr, flags, 6, pc);
ftrace_trace_userstack(tr, flags, pc);
}
@@ -1285,8 +1288,8 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
entry->fmt = fmt;
memcpy(entry->buf, trace_buf, sizeof(u32) * len);
- filter_check_discard(call, entry, event);
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
out_unlock:
__raw_spin_unlock(&trace_buf_lock);
@@ -1341,8 +1344,8 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
memcpy(&entry->buf, trace_buf, len);
entry->buf[len] = 0;
- filter_check_discard(call, entry, event);
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
out_unlock:
__raw_spin_unlock(&trace_buf_lock);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index c67cbdd..2d717b5 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -866,13 +866,21 @@ extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
extern void filter_free_subsystem_preds(struct event_subsystem *system);
extern int filter_add_subsystem_pred(struct event_subsystem *system,
struct filter_pred *pred);
+extern int filter_current_check_discard(struct ftrace_event_call *call,
+ void *rec,
+ struct ring_buffer_event *event);
-static inline void
+static inline int
filter_check_discard(struct ftrace_event_call *call, void *rec,
+ struct ring_buffer *buffer,
struct ring_buffer_event *event)
{
- if (unlikely(call->preds) && !filter_match_preds(call, rec))
- ring_buffer_event_discard(event);
+ if (unlikely(call->preds) && !filter_match_preds(call, rec)) {
+ ring_buffer_discard_commit(buffer, event);
+ return 1;
+ }
+
+ return 0;
}
#define __common_field(type, item) \
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
index c95c25d..8e64e60 100644
--- a/kernel/trace/trace_branch.c
+++ b/kernel/trace/trace_branch.c
@@ -74,9 +74,8 @@ probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
entry->line = f->line;
entry->correct = val == expect;
- filter_check_discard(call, entry, event);
-
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
out:
atomic_dec(&tr->data[cpu]->disabled);
diff --git a/kernel/trace/trace_events_stage_3.h b/kernel/trace/trace_events_stage_3.h
index d2f34bf..b2b2982 100644
--- a/kernel/trace/trace_events_stage_3.h
+++ b/kernel/trace/trace_events_stage_3.h
@@ -222,11 +222,8 @@ static void ftrace_raw_event_##call(proto) \
\
assign; \
\
- if (call->preds && !filter_match_preds(call, entry)) \
- trace_current_buffer_discard_commit(event); \
- else \
+ if (!filter_current_check_discard(call, entry, event)) \
trace_nowake_buffer_unlock_commit(event, irq_flags, pc); \
- \
} \
\
static int ftrace_raw_reg_event_##call(void) \
diff --git a/kernel/trace/trace_hw_branches.c b/kernel/trace/trace_hw_branches.c
index e6b275b..8683d50 100644
--- a/kernel/trace/trace_hw_branches.c
+++ b/kernel/trace/trace_hw_branches.c
@@ -195,8 +195,8 @@ void trace_hw_branch(u64 from, u64 to)
entry->ent.type = TRACE_HW_BRANCHES;
entry->from = from;
entry->to = to;
- filter_check_discard(call, entry, event);
- trace_buffer_unlock_commit(tr, event, 0, 0);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ trace_buffer_unlock_commit(tr, event, 0, 0);
out:
atomic_dec(&tr->data[cpu]->disabled);
diff --git a/kernel/trace/trace_power.c b/kernel/trace/trace_power.c
index 8ce7d7d..810a5b7 100644
--- a/kernel/trace/trace_power.c
+++ b/kernel/trace/trace_power.c
@@ -55,8 +55,8 @@ static void probe_power_end(struct power_trace *it)
goto out;
entry = ring_buffer_event_data(event);
entry->state_data = *it;
- filter_check_discard(call, entry, event);
- trace_buffer_unlock_commit(tr, event, 0, 0);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ trace_buffer_unlock_commit(tr, event, 0, 0);
out:
preempt_enable();
}
@@ -87,8 +87,8 @@ static void probe_power_mark(struct power_trace *it, unsigned int type,
goto out;
entry = ring_buffer_event_data(event);
entry->state_data = *it;
- filter_check_discard(call, entry, event);
- trace_buffer_unlock_commit(tr, event, 0, 0);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ trace_buffer_unlock_commit(tr, event, 0, 0);
out:
preempt_enable();
}
--
1.5.6.3
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