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authorFrederic Weisbecker <fweisbec@gmail.com>2009-11-06 04:13:05 +0100
committerIngo Molnar <mingo@elte.hu>2009-11-08 10:31:42 +0100
commit444a2a3bcd6d5bed5c823136f68fcc93c0fe283f (patch)
tree6a57308586b4e723238646074e79298845803520 /include/trace/ftrace.h
parent09879b99d44d701c603935ef2549004405d7f8f9 (diff)
tracing, perf_events: Protect the buffer from recursion in perf
While tracing using events with perf, if one enables the lockdep:lock_acquire event, it will infect every other perf trace events. Basically, you can enable whatever set of trace events through perf but if this event is part of the set, the only result we can get is a long list of lock_acquire events of rcu read lock, and only that. This is because of a recursion inside perf. 1) When a trace event is triggered, it will fill a per cpu buffer and submit it to perf. 2) Perf will commit this event but will also protect some data using rcu_read_lock 3) A recursion appears: rcu_read_lock triggers a lock_acquire event that will fill the per cpu event and then submit the buffer to perf. 4) Perf detects a recursion and ignores it 5) Perf continues its work on the previous event, but its buffer has been overwritten by the lock_acquire event, it has then been turned into a lock_acquire event of rcu read lock Such scenario also happens with lock_release with rcu_read_unlock(). We could turn the rcu_read_lock() into __rcu_read_lock() to drop the lock debugging from perf fast path, but that would make us lose the rcu debugging and that doesn't prevent from other possible kind of recursion from perf in the future. This patch adds a recursion protection based on a counter on the perf trace per cpu buffers to solve the problem. -v2: Fixed lost whitespace, added reviewed-by tag Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Reviewed-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Jason Baron <jbaron@redhat.com> LKML-Reference: <1257477185-7838-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/trace/ftrace.h')
-rw-r--r--include/trace/ftrace.h39
1 files changed, 30 insertions, 9 deletions
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index a7f946094128..4945d1c99864 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -649,6 +649,7 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
* struct ftrace_event_call *event_call = &event_<call>;
* extern void perf_tp_event(int, u64, u64, void *, int);
* struct ftrace_raw_##call *entry;
+ * struct perf_trace_buf *trace_buf;
* u64 __addr = 0, __count = 1;
* unsigned long irq_flags;
* struct trace_entry *ent;
@@ -673,14 +674,25 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
* __cpu = smp_processor_id();
*
* if (in_nmi())
- * raw_data = rcu_dereference(trace_profile_buf_nmi);
+ * trace_buf = rcu_dereference(perf_trace_buf_nmi);
* else
- * raw_data = rcu_dereference(trace_profile_buf);
+ * trace_buf = rcu_dereference(perf_trace_buf);
*
- * if (!raw_data)
+ * if (!trace_buf)
* goto end;
*
- * raw_data = per_cpu_ptr(raw_data, __cpu);
+ * trace_buf = per_cpu_ptr(trace_buf, __cpu);
+ *
+ * // Avoid recursion from perf that could mess up the buffer
+ * if (trace_buf->recursion++)
+ * goto end_recursion;
+ *
+ * raw_data = trace_buf->buf;
+ *
+ * // Make recursion update visible before entering perf_tp_event
+ * // so that we protect from perf recursions.
+ *
+ * barrier();
*
* //zero dead bytes from alignment to avoid stack leak to userspace:
* *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
@@ -713,8 +725,9 @@ static void ftrace_profile_##call(proto) \
{ \
struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
struct ftrace_event_call *event_call = &event_##call; \
- extern void perf_tp_event(int, u64, u64, void *, int); \
+ extern void perf_tp_event(int, u64, u64, void *, int); \
struct ftrace_raw_##call *entry; \
+ struct perf_trace_buf *trace_buf; \
u64 __addr = 0, __count = 1; \
unsigned long irq_flags; \
struct trace_entry *ent; \
@@ -739,14 +752,20 @@ static void ftrace_profile_##call(proto) \
__cpu = smp_processor_id(); \
\
if (in_nmi()) \
- raw_data = rcu_dereference(trace_profile_buf_nmi); \
+ trace_buf = rcu_dereference(perf_trace_buf_nmi); \
else \
- raw_data = rcu_dereference(trace_profile_buf); \
+ trace_buf = rcu_dereference(perf_trace_buf); \
\
- if (!raw_data) \
+ if (!trace_buf) \
goto end; \
\
- raw_data = per_cpu_ptr(raw_data, __cpu); \
+ trace_buf = per_cpu_ptr(trace_buf, __cpu); \
+ if (trace_buf->recursion++) \
+ goto end_recursion; \
+ \
+ barrier(); \
+ \
+ raw_data = trace_buf->buf; \
\
*(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL; \
entry = (struct ftrace_raw_##call *)raw_data; \
@@ -761,6 +780,8 @@ static void ftrace_profile_##call(proto) \
perf_tp_event(event_call->id, __addr, __count, entry, \
__entry_size); \
\
+end_recursion: \
+ trace_buf->recursion--; \
end: \
local_irq_restore(irq_flags); \
\