diff options
| -rw-r--r-- | kernel/trace/ring_buffer.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 804dfbdeef84..8c287430411d 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -45,6 +45,8 @@ static void update_pages_handler(struct work_struct *work); struct ring_buffer_meta { + unsigned long text_addr; + unsigned long data_addr; unsigned long first_buffer; unsigned long head_buffer; unsigned long commit_buffer; @@ -542,6 +544,9 @@ struct trace_buffer { unsigned long range_addr_start; unsigned long range_addr_end; + long last_text_delta; + long last_data_delta; + unsigned int subbuf_size; unsigned int subbuf_order; unsigned int max_data_size; @@ -1821,10 +1826,15 @@ static void rb_meta_validate_events(struct ring_buffer_per_cpu *cpu_buffer) } } +/* Used to calculate data delta */ +static char rb_data_ptr[] = ""; + static void rb_range_meta_init(struct trace_buffer *buffer, int nr_pages) { struct ring_buffer_meta *meta; unsigned long delta; + unsigned long this_text = (unsigned long)rb_range_meta_init; + unsigned long this_data = (unsigned long)rb_data_ptr; void *subbuf; int cpu; int i; @@ -1841,6 +1851,10 @@ static void rb_range_meta_init(struct trace_buffer *buffer, int nr_pages) meta->first_buffer += delta; meta->head_buffer += delta; meta->commit_buffer += delta; + buffer->last_text_delta = this_text - meta->text_addr; + buffer->last_data_delta = this_data - meta->data_addr; + meta->text_addr = this_text; + meta->data_addr = this_data; continue; } @@ -1857,6 +1871,8 @@ static void rb_range_meta_init(struct trace_buffer *buffer, int nr_pages) subbuf = rb_subbufs_from_meta(meta); meta->first_buffer = (unsigned long)subbuf; + meta->text_addr = this_text; + meta->data_addr = this_data; /* * The buffers[] array holds the order of the sub-buffers |