+++ /dev/null
-#ifndef _LINUX_RING_BUFFER_FRONTEND_TYPES_H
-#define _LINUX_RING_BUFFER_FRONTEND_TYPES_H
-
-/*
- * linux/ringbuffer/frontend_types.h
- *
- * (C) Copyright 2005-2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * Ring Buffer Library Synchronization Header (types).
- *
- * Author:
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * See ring_buffer_frontend.c for more information on wait-free algorithms.
- *
- * Dual LGPL v2.1/GPL v2 license.
- */
-
-#include <string.h>
-
-#include <urcu/list.h>
-#include <urcu/uatomic.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
- * won't write in the new sub-buffer).
- */
-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; /*
- * Commit count mask, removing
- * the MSBs corresponding to
- * bits used to represent the
- * subbuffer index.
- */
-
- 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 */
- size_t priv_data_offset;
- /*
- * Associated backend contains a variable-length array. Needs to
- * be last member.
- */
- struct channel_backend backend; /* Associated backend */
- 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 */
- 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 */
- 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 */
- DECLARE_SHMP(struct commit_counters_hot, commit_hot);
- /* Commit count per sub-buffer */
- long consumed; /*
- * Current offset in the buffer
- * standard atomic access (shared)
- */
- int record_disabled;
- /* End of first 32 bytes cacheline */
- union v_atomic last_tsc; /*
- * Last timestamp written in the buffer.
- */
-
- struct lttng_ust_lib_ring_buffer_backend backend; /* Associated backend */
-
- 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 */
- union v_atomic records_lost_big; /* Events too big */
- union v_atomic records_count; /* Number of records written */
- union v_atomic records_overrun; /* Number of overwritten records */
- //wait_queue_head_t read_wait; /* reader buffer-level wait queue */
- int finalized; /* buffer has been finalized */
- //struct timer_list switch_timer; /* timer for periodical switch */
- //struct timer_list read_timer; /* timer for read poll */
- unsigned long get_subbuf_consumed; /* Read-side consumed */
- unsigned long prod_snapshot; /* Producer count snapshot */
- unsigned long cons_snapshot; /* Consumer count snapshot */
- 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);
- char padding[RB_RING_BUFFER_PADDING];
-} __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
-
-static inline
-void *channel_get_private(struct channel *chan)
-{
- 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
- * parameters.
- */
-#define CHAN_WARN_ON(c, cond) \
- ({ \
- struct channel *__chan; \
- int _____ret = caa_unlikely(cond); \
- if (_____ret) { \
- if (__rb_same_type(*(c), struct channel_backend)) \
- __chan = caa_container_of((void *) (c), \
- struct channel, \
- backend); \
- else if (__rb_same_type(*(c), struct channel)) \
- __chan = (void *) (c); \
- else \
- BUG_ON(1); \
- uatomic_inc(&__chan->record_disabled); \
- WARN_ON(1); \
- } \
- _____ret; \
- })
-
-#endif /* _LINUX_RING_BUFFER_FRONTEND_TYPES_H */
projects / lttng-ust.git / blobdiff