X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=lib%2Fringbuffer%2Fbackend_internal.h;h=e03d8c0b1b23a1363fdebbe5ed8589223226983c;hb=85a07c33f3b180d9c1be38832961d0feef66be66;hp=16001776f6ebcc4b9477c427a868509b9bc5c387;hpb=d87a9f0376535ea0ab125f2f0cfc6ce6e325c0c1;p=lttng-modules.git

diff --git a/lib/ringbuffer/backend_internal.h b/lib/ringbuffer/backend_internal.h
index 16001776..e03d8c0b 100644
--- a/lib/ringbuffer/backend_internal.h
+++ b/lib/ringbuffer/backend_internal.h
@@ -201,6 +201,42 @@ int subbuffer_id_check_index(const struct lib_ring_buffer_config *config,
 		return 0;
 }
 
+static inline
+void lib_ring_buffer_backend_get_pages(const struct lib_ring_buffer_config *config,
+			struct lib_ring_buffer_ctx *ctx,
+			struct lib_ring_buffer_backend_pages **backend_pages)
+{
+	struct lib_ring_buffer_backend *bufb = &ctx->buf->backend;
+	struct channel_backend *chanb = &ctx->chan->backend;
+	size_t sbidx, offset = ctx->buf_offset;
+	unsigned long sb_bindex, id;
+	struct lib_ring_buffer_backend_pages *rpages;
+
+	offset &= chanb->buf_size - 1;
+	sbidx = offset >> chanb->subbuf_size_order;
+	id = bufb->buf_wsb[sbidx].id;
+	sb_bindex = subbuffer_id_get_index(config, id);
+	rpages = bufb->array[sb_bindex];
+	CHAN_WARN_ON(ctx->chan,
+		     config->mode == RING_BUFFER_OVERWRITE
+		     && subbuffer_id_is_noref(config, id));
+	*backend_pages = rpages;
+}
+
+/* Get backend pages from cache. */
+static inline
+struct lib_ring_buffer_backend_pages *
+	lib_ring_buffer_get_backend_pages_from_ctx(const struct lib_ring_buffer_config *config,
+		struct lib_ring_buffer_ctx *ctx)
+{
+	return ctx->backend_pages;
+}
+
+/*
+ * 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 lib_ring_buffer_config *config,
 			    struct lib_ring_buffer_backend *bufb,
@@ -211,6 +247,14 @@ void subbuffer_count_record(const struct lib_ring_buffer_config *config,
 	sb_bindex = subbuffer_id_get_index(config, bufb->buf_wsb[idx].id);
 	v_inc(config, &bufb->array[sb_bindex]->records_commit);
 }
+#else /* LTTNG_RING_BUFFER_COUNT_EVENTS */
+static inline
+void subbuffer_count_record(const struct lib_ring_buffer_config *config,
+			    struct lib_ring_buffer_backend *bufb,
+			    unsigned long idx)
+{
+}
+#endif /* #else LTTNG_RING_BUFFER_COUNT_EVENTS */
 
 /*
  * Reader has exclusive subbuffer access for record consumption. No need to