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perf_events: Undo some recursion damage

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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>
This commit is contained in:
Peter Zijlstra
2009-11-23 11:37:29 +01:00
committed by Ingo Molnar
parent f67218c3e9
commit 4ed7c92d68
5 changed files with 61 additions and 63 deletions
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17
include/trace/ftrace.h
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@@ -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); \
\
}