diff options
Diffstat (limited to 'drivers/oprofile/cpu_buffer.c')
| -rw-r--r-- | drivers/oprofile/cpu_buffer.c | 48 |
1 files changed, 46 insertions, 2 deletions
diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c index e52c085cd18..cd67d4dd30b 100644 --- a/drivers/oprofile/cpu_buffer.c +++ b/drivers/oprofile/cpu_buffer.c @@ -45,8 +45,8 @@ * can be changed to a single buffer solution when the ring buffer * access is implemented as non-locking atomic code. */ -struct ring_buffer *op_ring_buffer_read; -struct ring_buffer *op_ring_buffer_write; +static struct ring_buffer *op_ring_buffer_read; +static struct ring_buffer *op_ring_buffer_write; DEFINE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer); static void wq_sync_buffer(struct work_struct *work); @@ -145,6 +145,50 @@ void end_cpu_work(void) flush_scheduled_work(); } +int op_cpu_buffer_write_entry(struct op_entry *entry) +{ + entry->event = ring_buffer_lock_reserve(op_ring_buffer_write, + sizeof(struct op_sample), + &entry->irq_flags); + if (entry->event) + entry->sample = ring_buffer_event_data(entry->event); + else + entry->sample = NULL; + + if (!entry->sample) + return -ENOMEM; + + return 0; +} + +int op_cpu_buffer_write_commit(struct op_entry *entry) +{ + return ring_buffer_unlock_commit(op_ring_buffer_write, entry->event, + entry->irq_flags); +} + +struct op_sample *op_cpu_buffer_read_entry(int cpu) +{ + struct ring_buffer_event *e; + e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL); + if (e) + return ring_buffer_event_data(e); + if (ring_buffer_swap_cpu(op_ring_buffer_read, + op_ring_buffer_write, + cpu)) + return NULL; + e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL); + if (e) + return ring_buffer_event_data(e); + return NULL; +} + +unsigned long op_cpu_buffer_entries(int cpu) +{ + return ring_buffer_entries_cpu(op_ring_buffer_read, cpu) + + ring_buffer_entries_cpu(op_ring_buffer_write, cpu); +} + static inline int add_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc, unsigned long event) |