#include <urcu/list.h>
#include <urcu/uatomic.h>
-#include "ust/core.h"
-
-#include <ust/usterr-signal-safe.h>
-#include <ust/ringbuffer-config.h>
+#include <lttng/ringbuffer-config.h>
+#include <usterr-signal-safe.h>
#include "backend_types.h"
#include "shm_internal.h"
+#include "vatomic.h"
/*
* A switch is done during tracing or as a final flush after tracing (so it
enum switch_mode { SWITCH_ACTIVE, SWITCH_FLUSH };
/* channel: collection of per-cpu ring buffers. */
+#define RB_CHANNEL_PADDING 64
struct channel {
int record_disabled;
unsigned long commit_count_mask; /*
unsigned long read_timer_interval; /* Reader wakeup (jiffies) */
//wait_queue_head_t read_wait; /* reader wait queue */
int finalized; /* Has channel been finalized */
+ size_t priv_data_offset;
/*
* Associated backend contains a variable-length array. Needs to
* be last member.
*/
struct channel_backend backend; /* Associated backend */
-} ____cacheline_aligned;
+ char padding[RB_CHANNEL_PADDING];
+} __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
/* Per-subbuffer commit counters used on the hot path */
+#define RB_COMMIT_COUNT_HOT_PADDING 16
struct commit_counters_hot {
union v_atomic cc; /* Commit counter */
union v_atomic seq; /* Consecutive commits */
-} ____cacheline_aligned;
+ char padding[RB_COMMIT_COUNT_HOT_PADDING];
+} __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
/* Per-subbuffer commit counters used only on cold paths */
+#define RB_COMMIT_COUNT_COLD_PADDING 24
struct commit_counters_cold {
union v_atomic cc_sb; /* Incremented _once_ at sb switch */
-} ____cacheline_aligned;
+ char padding[RB_COMMIT_COUNT_COLD_PADDING];
+} __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
/* ring buffer state */
+#define RB_RING_BUFFER_PADDING 64
struct lttng_ust_lib_ring_buffer {
/* First 32 bytes cache-hot cacheline */
union v_atomic offset; /* Current offset in the buffer */
unsigned long get_subbuf_consumed; /* Read-side consumed */
unsigned long prod_snapshot; /* Producer count snapshot */
unsigned long cons_snapshot; /* Consumer count snapshot */
- 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 */
+ unsigned int get_subbuf:1, /* Sub-buffer being held by reader */
+ switch_timer_enabled:1, /* Protected by ring_buffer_nohz_lock */
+ read_timer_enabled:1; /* Protected by ring_buffer_nohz_lock */
/* shmp pointer to self */
DECLARE_SHMP(struct lttng_ust_lib_ring_buffer, self);
-} ____cacheline_aligned;
+ char padding[RB_RING_BUFFER_PADDING];
+} __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;
}
+#ifndef __rb_same_type
+#define __rb_same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
+#endif
+
/*
* Issue warnings and disable channels upon internal error.
* Can receive struct lttng_ust_lib_ring_buffer or struct lttng_ust_lib_ring_buffer_backend
struct channel *__chan; \
int _____ret = caa_unlikely(cond); \
if (_____ret) { \
- if (__same_type(*(c), struct channel_backend)) \
+ if (__rb_same_type(*(c), struct channel_backend)) \
__chan = caa_container_of((void *) (c), \
struct channel, \
backend); \
- else if (__same_type(*(c), struct channel)) \
+ else if (__rb_same_type(*(c), struct channel)) \
__chan = (void *) (c); \
else \
BUG_ON(1); \