Document last supported kernel version for stable-2.10 branch

[lttng-modules.git] / lttng-ring-buffer-client.h

diff --git a/lttng-ring-buffer-client.h b/lttng-ring-buffer-client.h
index 34493333bcc8a0055db535cf262a319e09b92021..8916ab0239a537215a310f05acf1b99c8ef97ff2 100644 (file)
--- a/lttng-ring-buffer-client.h
+++ b/lttng-ring-buffer-client.h
@@ -22,12 +22,12 @@
 
 #include <linux/module.h>
 #include <linux/types.h>
-#include "lib/bitfield.h"
-#include "wrapper/vmalloc.h"   /* for wrapper_vmalloc_sync_all() */
-#include "wrapper/trace-clock.h"
-#include "lttng-events.h"
-#include "lttng-tracer.h"
-#include "wrapper/ringbuffer/frontend_types.h"
+#include <lib/bitfield.h>
+#include <wrapper/vmalloc.h>   /* for wrapper_vmalloc_sync_all() */
+#include <wrapper/trace-clock.h>
+#include <lttng-events.h>
+#include <lttng-tracer.h>
+#include <wrapper/ringbuffer/frontend_types.h>
 
 #define LTTNG_COMPACT_EVENT_BITS       5
 #define LTTNG_COMPACT_TSC_BITS         27
@@ -57,6 +57,7 @@ struct packet_header {
                                         */
        uint8_t uuid[16];
        uint32_t stream_id;
+       uint64_t stream_instance_id;
 
        struct {
                /* Stream packet context */
@@ -123,13 +124,14 @@ void ctx_record(struct lib_ring_buffer_ctx *bufctx,
  * contains.
  */
 static __inline__
-unsigned char record_header_size(const struct lib_ring_buffer_config *config,
+size_t record_header_size(const struct lib_ring_buffer_config *config,
                                 struct channel *chan, size_t offset,
                                 size_t *pre_header_padding,
                                 struct lib_ring_buffer_ctx *ctx)
 {
        struct lttng_channel *lttng_chan = channel_get_private(chan);
-       struct lttng_event *event = ctx->priv;
+       struct lttng_probe_ctx *lttng_probe_ctx = ctx->priv;
+       struct lttng_event *event = lttng_probe_ctx->event;
        size_t orig_offset = offset;
        size_t padding;
 
@@ -168,14 +170,14 @@ unsigned char record_header_size(const struct lib_ring_buffer_config *config,
                padding = 0;
                WARN_ON_ONCE(1);
        }
-       offset += ctx_get_size(offset, event->ctx);
        offset += ctx_get_size(offset, lttng_chan->ctx);
+       offset += ctx_get_size(offset, event->ctx);
 
        *pre_header_padding = padding;
        return offset - orig_offset;
 }
 
-#include "wrapper/ringbuffer/api.h"
+#include <wrapper/ringbuffer/api.h>
 
 static
 void lttng_write_event_header_slow(const struct lib_ring_buffer_config *config,
@@ -197,7 +199,8 @@ void lttng_write_event_header(const struct lib_ring_buffer_config *config,
                            uint32_t event_id)
 {
        struct lttng_channel *lttng_chan = channel_get_private(ctx->chan);
-       struct lttng_event *event = ctx->priv;
+       struct lttng_probe_ctx *lttng_probe_ctx = ctx->priv;
+       struct lttng_event *event = lttng_probe_ctx->event;
 
        if (unlikely(ctx->rflags))
                goto slow_path;
@@ -248,7 +251,8 @@ void lttng_write_event_header_slow(const struct lib_ring_buffer_config *config,
                                 uint32_t event_id)
 {
        struct lttng_channel *lttng_chan = channel_get_private(ctx->chan);
-       struct lttng_event *event = ctx->priv;
+       struct lttng_probe_ctx *lttng_probe_ctx = ctx->priv;
+       struct lttng_event *event = lttng_probe_ctx->event;
 
        switch (lttng_chan->header_type) {
        case 1: /* compact */
@@ -352,6 +356,7 @@ static void client_buffer_begin(struct lib_ring_buffer *buf, u64 tsc,
        header->magic = CTF_MAGIC_NUMBER;
        memcpy(header->uuid, session->uuid.b, sizeof(session->uuid));
        header->stream_id = lttng_chan->id;
+       header->stream_instance_id = buf->backend.cpu;
        header->ctx.timestamp_begin = tsc;
        header->ctx.timestamp_end = 0;
        header->ctx.content_size = ~0ULL; /* for debugging */
@@ -459,9 +464,10 @@ static int client_stream_id(const struct lib_ring_buffer_config *config,
                        struct lib_ring_buffer *buf,
                        uint64_t *stream_id)
 {
-       struct packet_header *header = client_packet_header(config, buf);
-       *stream_id = header->stream_id;
+       struct channel *chan = buf->backend.chan;
+       struct lttng_channel *lttng_chan = channel_get_private(chan);
 
+       *stream_id = lttng_chan->id;
        return 0;
 }
 
@@ -485,6 +491,16 @@ static int client_sequence_number(const struct lib_ring_buffer_config *config,
        return 0;
 }
 
+static
+int client_instance_id(const struct lib_ring_buffer_config *config,
+               struct lib_ring_buffer *buf,
+               uint64_t *id)
+{
+       *id = buf->backend.cpu;
+
+       return 0;
+}
+
 static const struct lib_ring_buffer_config client_config = {
        .cb.ring_buffer_clock_read = client_ring_buffer_clock_read,
        .cb.record_header_size = client_record_header_size,
@@ -590,7 +606,7 @@ int lttng_event_reserve(struct lib_ring_buffer_ctx *ctx,
        int ret, cpu;
 
        cpu = lib_ring_buffer_get_cpu(&client_config);
-       if (cpu < 0)
+       if (unlikely(cpu < 0))
                return -EPERM;
        ctx->cpu = cpu;
 
@@ -608,8 +624,10 @@ int lttng_event_reserve(struct lib_ring_buffer_ctx *ctx,
        }
 
        ret = lib_ring_buffer_reserve(&client_config, ctx);
-       if (ret)
+       if (unlikely(ret))
                goto put;
+       lib_ring_buffer_backend_get_pages(&client_config, ctx,
+                       &ctx->backend_pages);
        lttng_write_event_header(&client_config, ctx, event_id);
        return 0;
 put:
@@ -716,6 +734,7 @@ static struct lttng_transport lttng_relay_transport = {
                .stream_id = client_stream_id,
                .current_timestamp = client_current_timestamp,
                .sequence_number = client_sequence_number,
+               .instance_id = client_instance_id,
        },
 };