* Dual LGPL v2.1/GPL v2 license.
*/
+#include <string.h>
+
#include <urcu/list.h>
#include <urcu/uatomic.h>
-#include <urcu/ref.h>
-#include "ust/core.h"
+#include "lttng/core.h"
-#include "usterr_signal_safe.h"
-#include "config.h"
+#include <lttng/usterr-signal-safe.h>
+#include <lttng/ringbuffer-config.h>
#include "backend_types.h"
+#include "shm_internal.h"
/*
* A switch is done during tracing or as a final flush after tracing (so it
* subbuffer index.
*/
- struct channel_backend backend; /* Associated backend */
-
unsigned long switch_timer_interval; /* Buffer flush (jiffies) */
unsigned long read_timer_interval; /* Reader wakeup (jiffies) */
//wait_queue_head_t read_wait; /* reader wait queue */
int finalized; /* Has channel been finalized */
- struct urcu_ref ref; /* Reference count */
-};
+ size_t priv_data_offset;
+ /*
+ * Associated backend contains a variable-length array. Needs to
+ * be last member.
+ */
+ struct channel_backend backend; /* Associated backend */
+} __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
/* Per-subbuffer commit counters used on the hot path */
struct commit_counters_hot {
union v_atomic cc; /* Commit counter */
union v_atomic seq; /* Consecutive commits */
-};
+} __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
/* Per-subbuffer commit counters used only on cold paths */
struct commit_counters_cold {
union v_atomic cc_sb; /* Incremented _once_ at sb switch */
-};
+} __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
/* ring buffer state */
-struct lib_ring_buffer {
+struct lttng_ust_lib_ring_buffer {
/* First 32 bytes cache-hot cacheline */
union v_atomic offset; /* Current offset in the buffer */
- struct commit_counters_hot *commit_hot;
+ DECLARE_SHMP(struct commit_counters_hot, commit_hot);
/* Commit count per sub-buffer */
long consumed; /*
* Current offset in the buffer
* Last timestamp written in the buffer.
*/
- struct lib_ring_buffer_backend backend; /* Associated backend */
+ struct lttng_ust_lib_ring_buffer_backend backend; /* Associated backend */
- struct commit_counters_cold *commit_cold;
+ DECLARE_SHMP(struct commit_counters_cold, commit_cold);
/* Commit count per sub-buffer */
long active_readers; /*
* Active readers count
* standard atomic access (shared)
*/
+ long active_shadow_readers;
/* Dropped records */
union v_atomic records_lost_full; /* Buffer full */
union v_atomic records_lost_wrap; /* Nested wrap-around */
int get_subbuf:1; /* Sub-buffer being held by reader */
int switch_timer_enabled:1; /* Protected by ring_buffer_nohz_lock */
int read_timer_enabled:1; /* Protected by ring_buffer_nohz_lock */
-};
+ /* shmp pointer to self */
+ DECLARE_SHMP(struct lttng_ust_lib_ring_buffer, self);
+} __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
static inline
void *channel_get_private(struct channel *chan)
{
- return chan->backend.priv;
+ return ((char *) chan) + chan->priv_data_offset;
}
/*
* Issue warnings and disable channels upon internal error.
- * Can receive struct lib_ring_buffer or struct lib_ring_buffer_backend
+ * Can receive struct lttng_ust_lib_ring_buffer or struct lttng_ust_lib_ring_buffer_backend
* parameters.
*/
#define CHAN_WARN_ON(c, cond) \
({ \
struct channel *__chan; \
- int _____ret = unlikely(cond); \
+ int _____ret = caa_unlikely(cond); \
if (_____ret) { \
if (__same_type(*(c), struct channel_backend)) \
__chan = caa_container_of((void *) (c), \