[lttng-dev] [UST PATCH 1/2] Specialize lttng_ust_lib_ring_buffer_client_cb
Julien Desfossez
jdesfossez at efficios.com
Fri Aug 16 14:39:45 EDT 2013
Prepare the ring-buffer config to have custom callbacks. These custom
callbacks are not related to the ring-buffer operations but allow
applications to add custom functions.
No additional feature or change in behaviour in this patch.
Signed-off-by: Julien Desfossez <jdesfossez at efficios.com>
---
include/lttng/ringbuffer-config.h | 4 +++-
include/lttng/ust-events.h | 6 ++---
liblttng-ust/Makefile.am | 1 +
liblttng-ust/lttng-rb-clients.h | 26 ++++++++++++++++++++++
liblttng-ust/lttng-ring-buffer-client.h | 18 ++++++++++++++-
liblttng-ust/lttng-ring-buffer-metadata-client.h | 18 ++++++++++++++-
6 files changed, 67 insertions(+), 6 deletions(-)
create mode 100644 liblttng-ust/lttng-rb-clients.h
diff --git a/include/lttng/ringbuffer-config.h b/include/lttng/ringbuffer-config.h
index 3b7d348..afb1310 100644
--- a/include/lttng/ringbuffer-config.h
+++ b/include/lttng/ringbuffer-config.h
@@ -133,7 +133,8 @@ struct lttng_ust_lib_ring_buffer_client_cb {
* RING_BUFFER_WAKEUP_NONE does not perform any wakeup whatsoever. The client
* has the responsibility to perform wakeups.
*/
-#define LTTNG_UST_RING_BUFFER_CONFIG_PADDING 32
+#define LTTNG_UST_RING_BUFFER_CONFIG_PADDING \
+ (32 - sizeof(const struct lttng_ust_lib_ring_buffer_client_cb *))
enum lttng_ust_lib_ring_buffer_alloc_types {
RING_BUFFER_ALLOC_PER_CPU,
@@ -204,6 +205,7 @@ struct lttng_ust_lib_ring_buffer_config {
* callbacks and update the cb pointers.
*/
int client_type;
+ const struct lttng_ust_lib_ring_buffer_client_cb *cb_ptr;
char padding[LTTNG_UST_RING_BUFFER_CONFIG_PADDING];
};
diff --git a/include/lttng/ust-events.h b/include/lttng/ust-events.h
index f40c044..74a3bc6 100644
--- a/include/lttng/ust-events.h
+++ b/include/lttng/ust-events.h
@@ -569,9 +569,9 @@ int lttng_add_ip_to_ctx(struct lttng_ctx **ctx);
void lttng_context_vtid_reset(void);
void lttng_context_vpid_reset(void);
-extern const struct lttng_ust_lib_ring_buffer_client_cb *lttng_client_callbacks_metadata;
-extern const struct lttng_ust_lib_ring_buffer_client_cb *lttng_client_callbacks_discard;
-extern const struct lttng_ust_lib_ring_buffer_client_cb *lttng_client_callbacks_overwrite;
+extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_metadata;
+extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_discard;
+extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_overwrite;
struct lttng_transport *lttng_transport_find(const char *name);
diff --git a/liblttng-ust/Makefile.am b/liblttng-ust/Makefile.am
index 1e6401a..5a43cf5 100644
--- a/liblttng-ust/Makefile.am
+++ b/liblttng-ust/Makefile.am
@@ -47,6 +47,7 @@ liblttng_ust_support_la_SOURCES = \
lttng-tracer.h \
lttng-tracer-core.h \
ust-core.c \
+ lttng-rb-clients.h \
lttng-ring-buffer-client.h \
lttng-ring-buffer-client-discard.c \
lttng-ring-buffer-client-discard-rt.c \
diff --git a/liblttng-ust/lttng-rb-clients.h b/liblttng-ust/lttng-rb-clients.h
new file mode 100644
index 0000000..c9a1619
--- /dev/null
+++ b/liblttng-ust/lttng-rb-clients.h
@@ -0,0 +1,26 @@
+#ifndef _LTTNG_RB_CLIENT_H
+#define _LTTNG_RB_CLIENT_H
+
+/*
+ * Copyright (c) 2013 - Mathieu Desnoyers <mathieu.desnoyers at 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
+ */
+
+struct lttng_ust_client_lib_ring_buffer_client_cb {
+ struct lttng_ust_lib_ring_buffer_client_cb parent;
+};
+
+#endif /* _LTTNG_RB_CLIENT_H */
diff --git a/liblttng-ust/lttng-ring-buffer-client.h b/liblttng-ust/lttng-ring-buffer-client.h
index 72b6d2c..383fce0 100644
--- a/liblttng-ust/lttng-ring-buffer-client.h
+++ b/liblttng-ust/lttng-ring-buffer-client.h
@@ -161,6 +161,7 @@ unsigned char record_header_size(const struct lttng_ust_lib_ring_buffer_config *
}
#include "../libringbuffer/api.h"
+#include "lttng-rb-clients.h"
static
void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config *config,
@@ -385,6 +386,19 @@ static void client_buffer_finalize(struct lttng_ust_lib_ring_buffer *buf, void *
{
}
+static const
+struct lttng_ust_client_lib_ring_buffer_client_cb client_cb = {
+ .parent = {
+ .ring_buffer_clock_read = client_ring_buffer_clock_read,
+ .record_header_size = client_record_header_size,
+ .subbuffer_header_size = client_packet_header_size,
+ .buffer_begin = client_buffer_begin,
+ .buffer_end = client_buffer_end,
+ .buffer_create = client_buffer_create,
+ .buffer_finalize = client_buffer_finalize,
+ },
+};
+
static const struct lttng_ust_lib_ring_buffer_config client_config = {
.cb.ring_buffer_clock_read = client_ring_buffer_clock_read,
.cb.record_header_size = client_record_header_size,
@@ -404,9 +418,11 @@ static const struct lttng_ust_lib_ring_buffer_config client_config = {
.ipi = RING_BUFFER_NO_IPI_BARRIER,
.wakeup = LTTNG_CLIENT_WAKEUP,
.client_type = LTTNG_CLIENT_TYPE,
+
+ .cb_ptr = &client_cb.parent,
};
-const struct lttng_ust_lib_ring_buffer_client_cb *LTTNG_CLIENT_CALLBACKS = &client_config.cb;
+const struct lttng_ust_client_lib_ring_buffer_client_cb *LTTNG_CLIENT_CALLBACKS = &client_cb;
static
struct lttng_channel *_channel_create(const char *name,
diff --git a/liblttng-ust/lttng-ring-buffer-metadata-client.h b/liblttng-ust/lttng-ring-buffer-metadata-client.h
index 89f2620..0d2a1f8 100644
--- a/liblttng-ust/lttng-ring-buffer-metadata-client.h
+++ b/liblttng-ust/lttng-ring-buffer-metadata-client.h
@@ -61,6 +61,7 @@ unsigned char record_header_size(const struct lttng_ust_lib_ring_buffer_config *
}
#include "../libringbuffer/api.h"
+#include "lttng-rb-clients.h"
static uint64_t client_ring_buffer_clock_read(struct channel *chan)
{
@@ -153,6 +154,19 @@ static void client_buffer_finalize(struct lttng_ust_lib_ring_buffer *buf,
{
}
+static const
+struct lttng_ust_client_lib_ring_buffer_client_cb client_cb = {
+ .parent = {
+ .ring_buffer_clock_read = client_ring_buffer_clock_read,
+ .record_header_size = client_record_header_size,
+ .subbuffer_header_size = client_packet_header_size,
+ .buffer_begin = client_buffer_begin,
+ .buffer_end = client_buffer_end,
+ .buffer_create = client_buffer_create,
+ .buffer_finalize = client_buffer_finalize,
+ },
+};
+
static const struct lttng_ust_lib_ring_buffer_config client_config = {
.cb.ring_buffer_clock_read = client_ring_buffer_clock_read,
.cb.record_header_size = client_record_header_size,
@@ -172,9 +186,11 @@ static const struct lttng_ust_lib_ring_buffer_config client_config = {
.ipi = RING_BUFFER_NO_IPI_BARRIER,
.wakeup = RING_BUFFER_WAKEUP_BY_WRITER,
.client_type = LTTNG_CLIENT_TYPE,
+
+ .cb_ptr = &client_cb.parent,
};
-const struct lttng_ust_lib_ring_buffer_client_cb *LTTNG_CLIENT_CALLBACKS = &client_config.cb;
+const struct lttng_ust_client_lib_ring_buffer_client_cb *LTTNG_CLIENT_CALLBACKS = &client_cb;
static
struct lttng_channel *_channel_create(const char *name,
--
1.7.10.4
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