Force 64-bit timestamps

[lttng-ust.git] / libringbuffer / frontend_api.h

diff --git a/libringbuffer/frontend_api.h b/libringbuffer/frontend_api.h
index 49f6e4c27274a32c2c59b05e414714b780770b9e..d5a2f2a043cb892a0ef020bfd7ef9b137978debb 100644 (file)
--- a/libringbuffer/frontend_api.h
+++ b/libringbuffer/frontend_api.h
@@ -93,8 +93,18 @@ int lib_ring_buffer_try_reserve(const struct lttng_ust_lib_ring_buffer_config *c
         */
        //prefetch(&buf->commit_hot[subbuf_index(*o_begin, chan)]);
 
+       /*
+        * Because we don't use any timer in the application, we
+        * currently cannot guarantee that we have frequent
+        * events that let us detect 27-bit overflows.
+        * Therefore, for now, we force event headers
+        * to contain 64-bit timestamps.
+        */
+       ctx->rflags |= RING_BUFFER_RFLAG_FULL_TSC;
+#if 0
        if (last_tsc_overflow(config, buf, ctx->tsc))
                ctx->rflags |= RING_BUFFER_RFLAG_FULL_TSC;
+#endif //0
 
        if (caa_unlikely(subbuf_offset(*o_begin, chan) == 0))
                return 1;