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tracing: Dump stacktrace trigger to the corresponding instance 

The stacktrace event trigger is not dumping the stacktrace to the instance
where it was enabled, but to the global "instance."

Use the private_data, pointing to the trigger file, to figure out the
corresponding trace instance, and use it in the trigger action, like
snapshot_trigger does.

Link: https://lkml.kernel.org/r/afbb0b4f18ba92c276865bc97204d438473f4ebc.1645396236.git.bristot@kernel.org

Cc: stable@vger.kernel.org
Fixes: ae63b31e4d ("tracing: Separate out trace events from global variables")
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Tested-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Daniel Bristot de Oliveira 2022-02-20 23:49:57 +01:00 committed by Steven Rostedt (Google)
parent 7414db4119
commit ce33c845b0
1 changed files with 6 additions and 1 deletions
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7
kernel/trace/trace_events_trigger.c
View File

@ -1540,7 +1540,12 @@ stacktrace_trigger(struct event_trigger_data *data,
struct trace_buffer *buffer, void *rec,
struct ring_buffer_event *event)
{
trace_dump_stack(STACK_SKIP);
struct trace_event_file *file = data->private_data;
if (file)
__trace_stack(file->tr, tracing_gen_ctx(), STACK_SKIP);
else
trace_dump_stack(STACK_SKIP);
}
static void