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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 /kernel/trace
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 'kernel/trace')
-rw-r--r--kernel/trace/trace_kprobe.c14
-rw-r--r--kernel/trace/trace_syscalls.c14
2 files changed, 16 insertions, 12 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 22e6f68b05b..79ce6a2bd74 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1213,7 +1213,7 @@ static __kprobes int kprobe_profile_func(struct kprobe *kp,
unsigned long irq_flags;
char *trace_buf;
char *raw_data;
- int *recursion;
+ int rctx;
pc = preempt_count();
__size = SIZEOF_KPROBE_TRACE_ENTRY(tp->nr_args);
@@ -1229,7 +1229,8 @@ static __kprobes int kprobe_profile_func(struct kprobe *kp,
*/
local_irq_save(irq_flags);
- if (perf_swevent_get_recursion_context(&recursion))
+ rctx = perf_swevent_get_recursion_context();
+ if (rctx < 0)
goto end_recursion;
__cpu = smp_processor_id();
@@ -1258,7 +1259,7 @@ static __kprobes int kprobe_profile_func(struct kprobe *kp,
perf_tp_event(call->id, entry->ip, 1, entry, size);
end:
- perf_swevent_put_recursion_context(recursion);
+ perf_swevent_put_recursion_context(rctx);
end_recursion:
local_irq_restore(irq_flags);
@@ -1276,8 +1277,8 @@ static __kprobes int kretprobe_profile_func(struct kretprobe_instance *ri,
int size, __size, i, pc, __cpu;
unsigned long irq_flags;
char *trace_buf;
- int *recursion;
char *raw_data;
+ int rctx;
pc = preempt_count();
__size = SIZEOF_KRETPROBE_TRACE_ENTRY(tp->nr_args);
@@ -1293,7 +1294,8 @@ static __kprobes int kretprobe_profile_func(struct kretprobe_instance *ri,
*/
local_irq_save(irq_flags);
- if (perf_swevent_get_recursion_context(&recursion))
+ rctx = perf_swevent_get_recursion_context();
+ if (rctx < 0)
goto end_recursion;
__cpu = smp_processor_id();
@@ -1323,7 +1325,7 @@ static __kprobes int kretprobe_profile_func(struct kretprobe_instance *ri,
perf_tp_event(call->id, entry->ret_ip, 1, entry, size);
end:
- perf_swevent_put_recursion_context(recursion);
+ perf_swevent_put_recursion_context(rctx);
end_recursion:
local_irq_restore(irq_flags);
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 41b6dd963da..9189cbe8607 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -481,8 +481,8 @@ static void prof_syscall_enter(struct pt_regs *regs, long id)
unsigned long flags;
char *trace_buf;
char *raw_data;
- int *recursion;
int syscall_nr;
+ int rctx;
int size;
int cpu;
@@ -506,7 +506,8 @@ static void prof_syscall_enter(struct pt_regs *regs, long id)
/* Protect the per cpu buffer, begin the rcu read side */
local_irq_save(flags);
- if (perf_swevent_get_recursion_context(&recursion))
+ rctx = perf_swevent_get_recursion_context();
+ if (rctx < 0)
goto end_recursion;
cpu = smp_processor_id();
@@ -530,7 +531,7 @@ static void prof_syscall_enter(struct pt_regs *regs, long id)
perf_tp_event(sys_data->enter_id, 0, 1, rec, size);
end:
- perf_swevent_put_recursion_context(recursion);
+ perf_swevent_put_recursion_context(rctx);
end_recursion:
local_irq_restore(flags);
}
@@ -582,7 +583,7 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
int syscall_nr;
char *trace_buf;
char *raw_data;
- int *recursion;
+ int rctx;
int size;
int cpu;
@@ -609,7 +610,8 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
/* Protect the per cpu buffer, begin the rcu read side */
local_irq_save(flags);
- if (perf_swevent_get_recursion_context(&recursion))
+ rctx = perf_swevent_get_recursion_context();
+ if (rctx < 0)
goto end_recursion;
cpu = smp_processor_id();
@@ -634,7 +636,7 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
perf_tp_event(sys_data->exit_id, 0, 1, rec, size);
end:
- perf_swevent_put_recursion_context(recursion);
+ perf_swevent_put_recursion_context(rctx);
end_recursion:
local_irq_restore(flags);
}