Performance: cache the backend pages pointer in context

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

diff --git a/lttng-ring-buffer-client.h b/lttng-ring-buffer-client.h
index e882f4936316eb95e9bbc3a74dc64c89bec00133..c4b7304fdfa6026153e14affbee429cf57ac53c7 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
@@ -130,7 +130,8 @@ size_t record_header_size(const struct lib_ring_buffer_config *config,
                                 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;
 
@@ -169,14 +170,14 @@ size_t 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,
@@ -198,7 +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;
@@ -249,7 +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 */
@@ -623,6 +626,8 @@ int lttng_event_reserve(struct lib_ring_buffer_ctx *ctx,
        ret = lib_ring_buffer_reserve(&client_config, ctx);
        if (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: