-#ifndef _LINUX_RING_BUFFER_BACKEND_INTERNAL_H
-#define _LINUX_RING_BUFFER_BACKEND_INTERNAL_H
+#ifndef _LTTNG_RING_BUFFER_BACKEND_INTERNAL_H
+#define _LTTNG_RING_BUFFER_BACKEND_INTERNAL_H
/*
- * linux/ringbuffer/backend_internal.h
- *
- * Copyright (C) 2008-2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * libringbuffer/backend_internal.h
*
* Ring buffer backend (internal helpers).
*
- * Dual LGPL v2.1/GPL v2 license.
+ * Copyright (C) 2005-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <unistd.h>
#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"
int channel_backend_init(struct channel_backend *chanb,
const char *name,
const struct lttng_ust_lib_ring_buffer_config *config,
- void *priv, size_t subbuf_size,
- size_t num_subbuf, struct lttng_ust_shm_handle *handle);
+ size_t subbuf_size,
+ size_t num_subbuf, struct lttng_ust_shm_handle *handle,
+ const int *stream_fds);
void channel_backend_free(struct channel_backend *chanb,
struct lttng_ust_shm_handle *handle);
return 0;
}
+/*
+ * The ring buffer can count events recorded and overwritten per buffer,
+ * but it is disabled by default due to its performance overhead.
+ */
+#ifdef LTTNG_RING_BUFFER_COUNT_EVENTS
static inline
void subbuffer_count_record(const struct lttng_ust_lib_ring_buffer_config *config,
struct lttng_ust_lib_ring_buffer_backend *bufb,
sb_bindex = subbuffer_id_get_index(config, shmp_index(handle, bufb->buf_wsb, idx)->id);
v_inc(config, &shmp(handle, shmp_index(handle, bufb->array, sb_bindex)->shmp)->records_commit);
}
+#else /* LTTNG_RING_BUFFER_COUNT_EVENTS */
+static inline
+void subbuffer_count_record(const struct lttng_ust_lib_ring_buffer_config *config,
+ struct lttng_ust_lib_ring_buffer_backend *bufb,
+ unsigned long idx, struct lttng_ust_shm_handle *handle)
+{
+}
+#endif /* #else LTTNG_RING_BUFFER_COUNT_EVENTS */
/*
* Reader has exclusive subbuffer access for record consumption. No need to
/*
* Must be executed at subbuffer delivery when the writer has _exclusive_
- * subbuffer access. See ring_buffer_check_deliver() for details.
- * ring_buffer_get_records_count() must be called to get the records count
- * before this function, because it resets the records_commit count.
+ * subbuffer access. See lib_ring_buffer_check_deliver() for details.
+ * lib_ring_buffer_get_records_count() must be called to get the records
+ * count before this function, because it resets the records_commit
+ * count.
*/
static inline
unsigned long subbuffer_count_records_overrun(
return shmp(handle, pages->shmp)->data_size;
}
+static inline
+void subbuffer_inc_packet_count(const struct lttng_ust_lib_ring_buffer_config *config,
+ struct lttng_ust_lib_ring_buffer_backend *bufb,
+ unsigned long idx, struct lttng_ust_shm_handle *handle)
+{
+ shmp_index(handle, bufb->buf_cnt, idx)->seq_cnt++;
+}
+
/**
* lib_ring_buffer_clear_noref - Clear the noref subbuffer flag, called by
* writer.
id = CMM_ACCESS_ONCE(shmp_index(handle, bufb->buf_wsb, idx)->id);
for (;;) {
/* This check is called on the fast path for each record. */
- if (likely(!subbuffer_id_is_noref(config, id))) {
+ if (caa_likely(!subbuffer_id_is_noref(config, id))) {
/*
* Store after load dependency ordering the writes to
* the subbuffer after load and test of the noref flag
new_id = id;
subbuffer_id_clear_noref(config, &new_id);
new_id = uatomic_cmpxchg(&shmp_index(handle, bufb->buf_wsb, idx)->id, id, new_id);
- if (likely(new_id == id))
+ if (caa_likely(new_id == id))
break;
id = new_id;
}
* following cmpxchg().
*/
old_id = shmp_index(handle, bufb->buf_wsb, consumed_idx)->id;
- if (unlikely(!subbuffer_id_is_noref(config, old_id)))
+ if (caa_unlikely(!subbuffer_id_is_noref(config, old_id)))
return -EAGAIN;
/*
* Make sure the offset count we are expecting matches the one
* indicated by the writer.
*/
- if (unlikely(!subbuffer_id_compare_offset(config, old_id,
+ if (caa_unlikely(!subbuffer_id_compare_offset(config, old_id,
consumed_count)))
return -EAGAIN;
CHAN_WARN_ON(shmp(handle, bufb->chan),
consumed_count);
new_id = uatomic_cmpxchg(&shmp_index(handle, bufb->buf_wsb, consumed_idx)->id, old_id,
bufb->buf_rsb.id);
- if (unlikely(old_id != new_id))
+ if (caa_unlikely(old_id != new_id))
return -EAGAIN;
bufb->buf_rsb.id = new_id;
} else {
return 0;
}
+#ifndef inline_memcpy
+#define inline_memcpy(dest, src, n) memcpy(dest, src, n)
+#endif
+
/*
* Use the architecture-specific memcpy implementation for constant-sized
* inputs, but rely on an inline memcpy for length statically unknown.
inline_memcpy(dest, src, __len); \
} while (0)
-#endif /* _LINUX_RING_BUFFER_BACKEND_INTERNAL_H */
+/*
+ * write len bytes to dest with c
+ */
+static inline
+void lib_ring_buffer_do_memset(char *dest, int c, unsigned long len)
+{
+ unsigned long i;
+
+ for (i = 0; i < len; i++)
+ dest[i] = c;
+}
+
+/* arch-agnostic implementation */
+
+static inline int lttng_ust_fls(unsigned int x)
+{
+ int r = 32;
+
+ if (!x)
+ return 0;
+ if (!(x & 0xFFFF0000U)) {
+ x <<= 16;
+ r -= 16;
+ }
+ if (!(x & 0xFF000000U)) {
+ x <<= 8;
+ r -= 8;
+ }
+ if (!(x & 0xF0000000U)) {
+ x <<= 4;
+ r -= 4;
+ }
+ if (!(x & 0xC0000000U)) {
+ x <<= 2;
+ r -= 2;
+ }
+ if (!(x & 0x80000000U)) {
+ /* No need to bit shift on last operation */
+ r -= 1;
+ }
+ return r;
+}
+
+static inline int get_count_order(unsigned int count)
+{
+ int order;
+
+ order = lttng_ust_fls(count) - 1;
+ if (count & (count - 1))
+ order++;
+ return order;
+}
+
+#endif /* _LTTNG_RING_BUFFER_BACKEND_INTERNAL_H */
projects / lttng-ust.git / blobdiff