#include <urcu/compiler.h>
-#include <ust/ringbuffer-config.h>
+#include <lttng/ringbuffer-config.h>
#include "backend_types.h"
#include "frontend_types.h"
#include "shm.h"
#if (CAA_BITS_PER_LONG == 32)
static inline
-void save_last_tsc(const struct lib_ring_buffer_config *config,
- struct lib_ring_buffer *buf, u64 tsc)
+void save_last_tsc(const struct lttng_ust_lib_ring_buffer_config *config,
+ struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc)
{
if (config->tsc_bits == 0 || config->tsc_bits == 64)
return;
}
static inline
-int last_tsc_overflow(const struct lib_ring_buffer_config *config,
- struct lib_ring_buffer *buf, u64 tsc)
+int last_tsc_overflow(const struct lttng_ust_lib_ring_buffer_config *config,
+ struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc)
{
unsigned long tsc_shifted;
return 0;
tsc_shifted = (unsigned long)(tsc >> config->tsc_bits);
- if (unlikely(tsc_shifted
+ if (caa_unlikely(tsc_shifted
- (unsigned long)v_read(config, &buf->last_tsc)))
return 1;
else
}
#else
static inline
-void save_last_tsc(const struct lib_ring_buffer_config *config,
- struct lib_ring_buffer *buf, u64 tsc)
+void save_last_tsc(const struct lttng_ust_lib_ring_buffer_config *config,
+ struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc)
{
if (config->tsc_bits == 0 || config->tsc_bits == 64)
return;
}
static inline
-int last_tsc_overflow(const struct lib_ring_buffer_config *config,
- struct lib_ring_buffer *buf, u64 tsc)
+int last_tsc_overflow(const struct lttng_ust_lib_ring_buffer_config *config,
+ struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc)
{
if (config->tsc_bits == 0 || config->tsc_bits == 64)
return 0;
- if (unlikely((tsc - v_read(config, &buf->last_tsc))
+ if (caa_unlikely((tsc - v_read(config, &buf->last_tsc))
>> config->tsc_bits))
return 1;
else
#endif
extern
-int lib_ring_buffer_reserve_slow(struct lib_ring_buffer_ctx *ctx);
+int lib_ring_buffer_reserve_slow(struct lttng_ust_lib_ring_buffer_ctx *ctx);
extern
-void lib_ring_buffer_switch_slow(struct lib_ring_buffer *buf,
+void lib_ring_buffer_switch_slow(struct lttng_ust_lib_ring_buffer *buf,
enum switch_mode mode,
- struct shm_handle *handle);
+ struct lttng_ust_shm_handle *handle);
/* Buffer write helpers */
static inline
-void lib_ring_buffer_reserve_push_reader(struct lib_ring_buffer *buf,
+void lib_ring_buffer_reserve_push_reader(struct lttng_ust_lib_ring_buffer *buf,
struct channel *chan,
unsigned long offset)
{
* write position sub-buffer index in the buffer being the one
* which will win this loop.
*/
- if (unlikely(subbuf_trunc(offset, chan)
+ if (caa_unlikely(subbuf_trunc(offset, chan)
- subbuf_trunc(consumed_old, chan)
>= chan->backend.buf_size))
consumed_new = subbuf_align(consumed_old, chan);
else
return;
- } while (unlikely(uatomic_cmpxchg(&buf->consumed, consumed_old,
+ } while (caa_unlikely(uatomic_cmpxchg(&buf->consumed, consumed_old,
consumed_new) != consumed_old));
}
static inline
-void lib_ring_buffer_vmcore_check_deliver(const struct lib_ring_buffer_config *config,
- struct lib_ring_buffer *buf,
+void lib_ring_buffer_vmcore_check_deliver(const struct lttng_ust_lib_ring_buffer_config *config,
+ struct lttng_ust_lib_ring_buffer *buf,
unsigned long commit_count,
unsigned long idx,
- struct shm_handle *handle)
+ struct lttng_ust_shm_handle *handle)
{
if (config->oops == RING_BUFFER_OOPS_CONSISTENCY)
v_set(config, &shmp_index(handle, buf->commit_hot, idx)->seq, commit_count);
}
static inline
-int lib_ring_buffer_poll_deliver(const struct lib_ring_buffer_config *config,
- struct lib_ring_buffer *buf,
+int lib_ring_buffer_poll_deliver(const struct lttng_ust_lib_ring_buffer_config *config,
+ struct lttng_ust_lib_ring_buffer *buf,
struct channel *chan,
- struct shm_handle *handle)
+ struct lttng_ust_shm_handle *handle)
{
unsigned long consumed_old, consumed_idx, commit_count, write_offset;
}
static inline
-int lib_ring_buffer_pending_data(const struct lib_ring_buffer_config *config,
- struct lib_ring_buffer *buf,
+int lib_ring_buffer_pending_data(const struct lttng_ust_lib_ring_buffer_config *config,
+ struct lttng_ust_lib_ring_buffer *buf,
struct channel *chan)
{
return !!subbuf_offset(v_read(config, &buf->offset), chan);
}
static inline
-unsigned long lib_ring_buffer_get_data_size(const struct lib_ring_buffer_config *config,
- struct lib_ring_buffer *buf,
+unsigned long lib_ring_buffer_get_data_size(const struct lttng_ust_lib_ring_buffer_config *config,
+ struct lttng_ust_lib_ring_buffer *buf,
unsigned long idx,
- struct shm_handle *handle)
+ struct lttng_ust_shm_handle *handle)
{
return subbuffer_get_data_size(config, &buf->backend, idx, handle);
}
* This is a very specific ftrace use-case, so we keep this as "internal" API.
*/
static inline
-int lib_ring_buffer_reserve_committed(const struct lib_ring_buffer_config *config,
- struct lib_ring_buffer *buf,
+int lib_ring_buffer_reserve_committed(const struct lttng_ust_lib_ring_buffer_config *config,
+ struct lttng_ust_lib_ring_buffer *buf,
struct channel *chan,
- struct shm_handle *handle)
+ struct lttng_ust_shm_handle *handle)
{
unsigned long offset, idx, commit_count;
}
static inline
-void lib_ring_buffer_check_deliver(const struct lib_ring_buffer_config *config,
- struct lib_ring_buffer *buf,
+void lib_ring_buffer_check_deliver(const struct lttng_ust_lib_ring_buffer_config *config,
+ struct lttng_ust_lib_ring_buffer *buf,
struct channel *chan,
unsigned long offset,
unsigned long commit_count,
unsigned long idx,
- struct shm_handle *handle)
+ struct lttng_ust_shm_handle *handle)
{
unsigned long old_commit_count = commit_count
- chan->backend.subbuf_size;
- u64 tsc;
+ uint64_t tsc;
/* Check if all commits have been done */
- if (unlikely((buf_trunc(offset, chan) >> chan->backend.num_subbuf_order)
+ if (caa_unlikely((buf_trunc(offset, chan) >> chan->backend.num_subbuf_order)
- (old_commit_count & chan->commit_count_mask) == 0)) {
/*
* If we succeeded at updating cc_sb below, we are the subbuffer
* The subbuffer size is least 2 bytes (minimum size: 1 page).
* This guarantees that old_commit_count + 1 != commit_count.
*/
- if (likely(v_cmpxchg(config, &shmp_index(handle, buf->commit_cold, idx)->cc_sb,
+ if (caa_likely(v_cmpxchg(config, &shmp_index(handle, buf->commit_cold, idx)->cc_sb,
old_commit_count, old_commit_count + 1)
== old_commit_count)) {
/*
* RING_BUFFER_WAKEUP_BY_WRITER wakeup is not lock-free.
*/
if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER
- && uatomic_read(&buf->active_readers)
+ && (uatomic_read(&buf->active_readers)
+ || uatomic_read(&buf->active_shadow_readers))
&& lib_ring_buffer_poll_deliver(config, buf, chan, handle)) {
int wakeup_fd = shm_get_wakeup_fd(handle, &buf->self._ref);
* Wake-up the other end by
* writing a null byte in the
* pipe (non-blocking).
+ * Important note: Because
+ * writing into the pipe is
+ * non-blocking (and therefore
+ * we allow dropping wakeup
+ * data, as long as there is
+ * wakeup data present in the
+ * pipe buffer to wake up the
+ * consumer), the consumer
+ * should perform the following
+ * sequence for waiting:
+ * 1) empty the pipe (reads).
+ * 2) check if there is data in
+ * the buffer.
+ * 3) wait on the pipe (poll).
*/
do {
ret = write(wakeup_fd, "", 1);
* useful for crash dump.
*/
static inline
-void lib_ring_buffer_write_commit_counter(const struct lib_ring_buffer_config *config,
- struct lib_ring_buffer *buf,
+void lib_ring_buffer_write_commit_counter(const struct lttng_ust_lib_ring_buffer_config *config,
+ struct lttng_ust_lib_ring_buffer *buf,
struct channel *chan,
unsigned long idx,
unsigned long buf_offset,
unsigned long commit_count,
size_t slot_size,
- struct shm_handle *handle)
+ struct lttng_ust_shm_handle *handle)
{
unsigned long offset, commit_seq_old;
* buffer full/empty mismatch because offset is never zero here
* (subbuffer header and record headers have non-zero length).
*/
- if (unlikely(subbuf_offset(offset - commit_count, chan)))
+ if (caa_unlikely(subbuf_offset(offset - commit_count, chan)))
return;
commit_seq_old = v_read(config, &shmp_index(handle, buf->commit_hot, idx)->seq);
commit_seq_old, commit_count);
}
-extern int lib_ring_buffer_create(struct lib_ring_buffer *buf,
+extern int lib_ring_buffer_create(struct lttng_ust_lib_ring_buffer *buf,
struct channel_backend *chanb, int cpu,
- struct shm_handle *handle,
+ struct lttng_ust_shm_handle *handle,
struct shm_object *shmobj);
-extern void lib_ring_buffer_free(struct lib_ring_buffer *buf,
- struct shm_handle *handle);
+extern void lib_ring_buffer_free(struct lttng_ust_lib_ring_buffer *buf,
+ struct lttng_ust_shm_handle *handle);
/* Keep track of trap nesting inside ring buffer code */
extern __thread unsigned int lib_ring_buffer_nesting;