diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 18256cd7ad2c..57e9c546bebb 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -894,23 +894,8 @@ int __trace_bputs(unsigned long ip, const char *str) EXPORT_SYMBOL_GPL(__trace_bputs); #ifdef CONFIG_TRACER_SNAPSHOT -/** - * trace_snapshot - take a snapshot of the current buffer. - * - * This causes a swap between the snapshot buffer and the current live - * tracing buffer. You can use this to take snapshots of the live - * trace when some condition is triggered, but continue to trace. - * - * Note, make sure to allocate the snapshot with either - * a tracing_snapshot_alloc(), or by doing it manually - * with: echo 1 > /sys/kernel/debug/tracing/snapshot - * - * If the snapshot buffer is not allocated, it will stop tracing. - * Basically making a permanent snapshot. - */ -void tracing_snapshot(void) +static void tracing_snapshot_instance(struct trace_array *tr) { - struct trace_array *tr = &global_trace; struct tracer *tracer = tr->current_trace; unsigned long flags; @@ -938,6 +923,27 @@ void tracing_snapshot(void) update_max_tr(tr, current, smp_processor_id()); local_irq_restore(flags); } + +/** + * trace_snapshot - take a snapshot of the current buffer. + * + * This causes a swap between the snapshot buffer and the current live + * tracing buffer. You can use this to take snapshots of the live + * trace when some condition is triggered, but continue to trace. + * + * Note, make sure to allocate the snapshot with either + * a tracing_snapshot_alloc(), or by doing it manually + * with: echo 1 > /sys/kernel/debug/tracing/snapshot + * + * If the snapshot buffer is not allocated, it will stop tracing. + * Basically making a permanent snapshot. + */ +void tracing_snapshot(void) +{ + struct trace_array *tr = &global_trace; + + tracing_snapshot_instance(tr); +} EXPORT_SYMBOL_GPL(tracing_snapshot); static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf, @@ -6739,7 +6745,7 @@ ftrace_snapshot(unsigned long ip, unsigned long parent_ip, struct trace_array *tr, struct ftrace_probe_ops *ops, void *data) { - tracing_snapshot(); + tracing_snapshot_instance(tr); } static void @@ -6761,7 +6767,7 @@ ftrace_count_snapshot(unsigned long ip, unsigned long parent_ip, (*count)--; } - tracing_snapshot(); + tracing_snapshot_instance(tr); } static int @@ -6868,7 +6874,7 @@ ftrace_trace_snapshot_callback(struct trace_array *tr, struct ftrace_hash *hash, ret = register_ftrace_function_probe(glob, tr, ops, count); if (ret >= 0) - alloc_snapshot(&global_trace); + alloc_snapshot(tr); return ret < 0 ? ret : 0; }