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uprobes/tracing: Introduce uprobe_{trace,perf}_print() helpers 

Extract the output code from uprobe_trace_func() and uprobe_perf_func()
into the new helpers, they will be used by ->ret_handler() too. We also
add the unused "unsigned long func" argument in advance, to simplify the
next changes.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Tested-by: Anton Arapov <anton@redhat.com>
This commit is contained in:
Oleg Nesterov 2013-03-30 18:02:12 +01:00
parent 457d1772f1
commit a51cc60417
1 changed files with 20 additions and 9 deletions
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29
kernel/trace/trace_uprobe.c
View File

@ -497,8 +497,8 @@ static const struct file_operations uprobe_profile_ops = {
.release = seq_release,
};
/* uprobe handler */
static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
static void uprobe_trace_print(struct trace_uprobe *tu,
unsigned long func, struct pt_regs *regs)
{
struct uprobe_trace_entry_head *entry;
struct ring_buffer_event *event;
@ -511,7 +511,7 @@ static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
size, 0, 0);
if (!event)
return 0;
return;
entry = ring_buffer_event_data(event);
entry->vaddr[0] = instruction_pointer(regs);
@ -521,7 +521,12 @@ static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
if (!filter_current_check_discard(buffer, call, entry, event))
trace_buffer_unlock_commit(buffer, event, 0, 0);
}
/* uprobe handler */
static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
{
uprobe_trace_print(tu, 0, regs);
return 0;
}
@ -754,8 +759,8 @@ static bool uprobe_perf_filter(struct uprobe_consumer *uc,
return ret;
}
/* uprobe profile handler */
static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
static void uprobe_perf_print(struct trace_uprobe *tu,
unsigned long func, struct pt_regs *regs)
{
struct ftrace_event_call *call = &tu->call;
struct uprobe_trace_entry_head *entry;
@ -764,13 +769,10 @@ static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
void *data;
int size, rctx, i;
if (!uprobe_perf_filter(&tu->consumer, 0, current->mm))
return UPROBE_HANDLER_REMOVE;
size = SIZEOF_TRACE_ENTRY(false);
size = ALIGN(size + tu->size + sizeof(u32), sizeof(u64)) - sizeof(u32);
if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough"))
return 0;
return;
preempt_disable();
entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx);
@ -787,6 +789,15 @@ static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
perf_trace_buf_submit(entry, size, rctx, ip, 1, regs, head, NULL);
out:
preempt_enable();
}
/* uprobe profile handler */
static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
{
if (!uprobe_perf_filter(&tu->consumer, 0, current->mm))
return UPROBE_HANDLER_REMOVE;
uprobe_perf_print(tu, 0, regs);
return 0;
}
#endif /* CONFIG_PERF_EVENTS */