diff options
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/ring_buffer.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 941ac2021b97..470d97169081 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -492,6 +492,8 @@ struct rb_time_struct { #endif typedef struct rb_time_struct rb_time_t; +#define MAX_NEST 5 + /* * head_page == tail_page && head == tail then buffer is empty. */ @@ -529,6 +531,7 @@ struct ring_buffer_per_cpu { unsigned long read_bytes; rb_time_t write_stamp; rb_time_t before_stamp; + u64 event_stamp[MAX_NEST]; u64 read_stamp; /* ring buffer pages to update, > 0 to add, < 0 to remove */ long nr_pages_to_update; @@ -2715,6 +2718,10 @@ rb_update_event(struct ring_buffer_per_cpu *cpu_buffer, { unsigned length = info->length; u64 delta = info->delta; + unsigned int nest = local_read(&cpu_buffer->committing) - 1; + + if (nest < MAX_NEST) + cpu_buffer->event_stamp[nest] = info->ts; /* * If we need to add a timestamp, then we @@ -3456,7 +3463,6 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer, info->after, ts)) { /* Nothing came after this event between C and E */ info->delta = ts - info->after; - info->ts = ts; } else { /* * Interrupted between C and E: @@ -3468,6 +3474,7 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer, */ info->delta = 0; } + info->ts = ts; info->add_timestamp &= ~RB_ADD_STAMP_FORCE; } @@ -5026,6 +5033,8 @@ rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer) rb_time_set(&cpu_buffer->write_stamp, 0); rb_time_set(&cpu_buffer->before_stamp, 0); + memset(cpu_buffer->event_stamp, 0, sizeof(cpu_buffer->event_stamp)); + cpu_buffer->lost_events = 0; cpu_buffer->last_overrun = 0; |