#include <string.h>
#include <lttng/ust-tracer.h>
-#include <lttng/ust-align.h>
+#include <lttng/ust-utils.h>
#include <lttng/ust-compiler.h>
struct lttng_ust_lib_ring_buffer;
struct lttng_ust_lib_ring_buffer_channel;
struct lttng_ust_lib_ring_buffer_ctx;
-struct lttng_ust_shm_handle;
/*
* ring buffer context
* at the end of the structure.
*/
struct lttng_ust_lib_ring_buffer_ctx {
- uint32_t struct_size; /* Size of this structure. */
+ uint32_t struct_size; /* Size of this structure. */
- /* input received by lib_ring_buffer_reserve(), saved here. */
+ /* input received by lib_ring_buffer_reserve(). */
struct lttng_ust_lib_ring_buffer_channel *chan; /* channel */
- void *priv; /* client private data */
- struct lttng_ust_shm_handle *handle; /* shared-memory handle */
- size_t data_size; /* size of payload */
- int largest_align; /*
- * alignment of the largest element
- * in the payload
- */
+ void *priv; /* client private data */
+ size_t data_size; /* size of payload */
+ int largest_align; /*
+ * alignment of the largest element
+ * in the payload
+ */
/* output from lib_ring_buffer_reserve() */
- int reserve_cpu; /* processor id updated by the reserve */
+ int reserve_cpu; /* processor id updated by the reserve */
+ size_t slot_size; /* size of the reserved slot */
+ unsigned long buf_offset; /* offset following the record header */
+ unsigned long pre_offset; /*
+ * Initial offset position _before_
+ * the record is written. Positioned
+ * prior to record header alignment
+ * padding.
+ */
+ uint64_t tsc; /* time-stamp counter value */
+ unsigned int rflags; /* reservation flags */
+ void *ip; /* caller ip address */
+
struct lttng_ust_lib_ring_buffer *buf; /*
- * buffer corresponding to processor id
- * for this channel
- */
- size_t slot_size; /* size of the reserved slot */
- unsigned long buf_offset; /* offset following the record header */
- unsigned long pre_offset; /*
- * Initial offset position _before_
- * the record is written. Positioned
- * prior to record header alignment
- * padding.
- */
- uint64_t tsc; /* time-stamp counter value */
- unsigned int rflags; /* reservation flags */
- void *ip; /* caller ip address */
+ * buffer corresponding to processor id
+ * for this channel
+ */
struct lttng_ust_lib_ring_buffer_backend_pages *backend_pages;
/* End of base ABI. Fields below should be used after checking struct_size. */
static inline lttng_ust_notrace
void lib_ring_buffer_ctx_init(struct lttng_ust_lib_ring_buffer_ctx *ctx,
struct lttng_ust_lib_ring_buffer_channel *chan,
- void *priv, size_t data_size, int largest_align,
- struct lttng_ust_shm_handle *handle);
+ void *priv, size_t data_size, int largest_align);
static inline
void lib_ring_buffer_ctx_init(struct lttng_ust_lib_ring_buffer_ctx *ctx,
struct lttng_ust_lib_ring_buffer_channel *chan,
- void *priv, size_t data_size, int largest_align,
- struct lttng_ust_shm_handle *handle)
+ void *priv, size_t data_size, int largest_align)
{
ctx->struct_size = sizeof(struct lttng_ust_lib_ring_buffer_ctx);
ctx->chan = chan;
ctx->reserve_cpu = -1;
ctx->largest_align = largest_align;
ctx->rflags = 0;
- ctx->handle = handle;
ctx->ip = 0;
}
/*
- * We need to define RING_BUFFER_ALIGN_ATTR so it is known early at
+ * We need to define LTTNG_UST_RING_BUFFER_ALIGN_ATTR so it is known early at
* compile-time. We have to duplicate the "config->align" information and the
* definition here because config->align is used both in the slow and fast
- * paths, but RING_BUFFER_ALIGN_ATTR is only available for the client code.
+ * paths, but LTTNG_UST_RING_BUFFER_ALIGN_ATTR is only available for the client
+ * code.
*/
-#ifdef RING_BUFFER_ALIGN
+#ifdef LTTNG_UST_RING_BUFFER_NATURAL_ALIGN
-# define RING_BUFFER_ALIGN_ATTR /* Default arch alignment */
+# define LTTNG_UST_RING_BUFFER_ALIGN_ATTR /* Default arch alignment */
/*
- * Calculate the offset needed to align the type.
- * size_of_type must be non-zero.
+ * lib_ring_buffer_align - Calculate the offset needed to align the type.
+ * @align_drift: object offset from an "alignment"-aligned address.
+ * @size_of_type: Must be non-zero, power of 2.
*/
static inline lttng_ust_notrace
unsigned int lib_ring_buffer_align(size_t align_drift, size_t size_of_type);
#else
-# define RING_BUFFER_ALIGN_ATTR __attribute__((packed))
+# define LTTNG_UST_RING_BUFFER_ALIGN_ATTR __attribute__((packed))
/*
- * Calculate the offset needed to align the type.
- * size_of_type must be non-zero.
+ * lib_ring_buffer_align - Calculate the offset needed to align the type.
+ * @align_drift: object offset from an "alignment"-aligned address.
+ * @size_of_type: Must be non-zero, power of 2.
*/
static inline lttng_ust_notrace
unsigned int lib_ring_buffer_align(size_t align_drift, size_t size_of_type);
static inline
unsigned int lib_ring_buffer_align(size_t align_drift, size_t size_of_type)
{
+ /*
+ * On architectures with efficient unaligned memory access, the content
+ * of the ringbuffer is packed and so the offset is always zero.
+ */
return 0;
}
projects / lttng-ust.git / blobdiff