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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-11-23 11:37:29 +0100
committerIngo Molnar <mingo@elte.hu>2009-11-23 11:49:57 +0100
commit4ed7c92d68a5387ba5f7030dc76eab03558e27f5 (patch)
tree38d758819c41261275c2dbd6f64976f824c5fd27 /include/trace/ftrace.h
parentf67218c3e93abaf0f480bb94b53d234853ffe4de (diff)
perf_events: Undo some recursion damage
Make perf_swevent_get_recursion_context return a context number and disable preemption. This could be used to remove the IRQ disable from the trace bit and index the per-cpu buffer with. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <20091123103819.993226816@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/trace/ftrace.h')
-rw-r--r--include/trace/ftrace.h17
1 files changed, 9 insertions, 8 deletions
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index c222ef5238bf..c3417c13e3ed 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -724,8 +724,8 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
static void ftrace_profile_##call(proto) \
{ \
struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
- extern int perf_swevent_get_recursion_context(int **recursion); \
- extern void perf_swevent_put_recursion_context(int *recursion); \
+ extern int perf_swevent_get_recursion_context(void); \
+ extern void perf_swevent_put_recursion_context(int rctx); \
struct ftrace_event_call *event_call = &event_##call; \
extern void perf_tp_event(int, u64, u64, void *, int); \
struct ftrace_raw_##call *entry; \
@@ -736,8 +736,8 @@ static void ftrace_profile_##call(proto) \
int __data_size; \
char *trace_buf; \
char *raw_data; \
- int *recursion; \
int __cpu; \
+ int rctx; \
int pc; \
\
pc = preempt_count(); \
@@ -753,8 +753,9 @@ static void ftrace_profile_##call(proto) \
\
local_irq_save(irq_flags); \
\
- if (perf_swevent_get_recursion_context(&recursion)) \
- goto end_recursion; \
+ rctx = perf_swevent_get_recursion_context(); \
+ if (rctx < 0) \
+ goto end_recursion; \
\
__cpu = smp_processor_id(); \
\
@@ -781,9 +782,9 @@ static void ftrace_profile_##call(proto) \
perf_tp_event(event_call->id, __addr, __count, entry, \
__entry_size); \
\
-end: \
- perf_swevent_put_recursion_context(recursion); \
-end_recursion: \
+end: \
+ perf_swevent_put_recursion_context(rctx); \
+end_recursion: \
local_irq_restore(irq_flags); \
\
}