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tracing: pass around ring buffer instead of tracer

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The latency tracers (irqsoff and wakeup) can swap trace buffers
on the fly. If an event is happening and has reserved data on one of
the buffers, and the latency tracer swaps the global buffer with the
max buffer, the result is that the event may commit the data to the
wrong buffer.

This patch changes the API to the trace recording to be recieve the
buffer that was used to reserve a commit. Then this buffer can be passed
in to the commit.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2009-09-02 14:17:06 -04:00 • committed by Steven Rostedt
parent f633903af2
commit e77405ad80
12 changed files with 163 additions and 109 deletions
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14
kernel/trace/trace_functions_graph.c
View file

@ -173,19 +173,20 @@ static int __trace_graph_entry(struct trace_array *tr,
{
struct ftrace_event_call *call = &event_funcgraph_entry;
struct ring_buffer_event *event;
struct ring_buffer *buffer = tr->buffer;
struct ftrace_graph_ent_entry *entry;
if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
return 0;
event = trace_buffer_lock_reserve(tr, TRACE_GRAPH_ENT,
event = trace_buffer_lock_reserve(buffer, TRACE_GRAPH_ENT,
sizeof(*entry), flags, pc);
if (!event)
return 0;
entry = ring_buffer_event_data(event);
entry->graph_ent = *trace;
if (!filter_current_check_discard(call, entry, event))
ring_buffer_unlock_commit(tr->buffer, event);
if (!filter_current_check_discard(buffer, call, entry, event))
ring_buffer_unlock_commit(buffer, event);
return 1;
}
@ -236,19 +237,20 @@ static void __trace_graph_return(struct trace_array *tr,
{
struct ftrace_event_call *call = &event_funcgraph_exit;
struct ring_buffer_event *event;
struct ring_buffer *buffer = tr->buffer;
struct ftrace_graph_ret_entry *entry;
if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
return;
event = trace_buffer_lock_reserve(tr, TRACE_GRAPH_RET,
event = trace_buffer_lock_reserve(buffer, TRACE_GRAPH_RET,
sizeof(*entry), flags, pc);
if (!event)
return;
entry = ring_buffer_event_data(event);
entry->ret = *trace;
if (!filter_current_check_discard(call, entry, event))
ring_buffer_unlock_commit(tr->buffer, event);
if (!filter_current_check_discard(buffer, call, entry, event))
ring_buffer_unlock_commit(buffer, event);
}
void trace_graph_return(struct ftrace_graph_ret *trace)