X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=README;h=55c72df72cf43b05b06605907a5e36941a2da2fa;hb=74d81a6cca2cd4a7718bba9368f382f9f2fbba84;hp=78ed56f68067bbdefef3bfb771110eb439377590;hpb=c993aa602df5d770ea1da811c4f7f643dde1ed34;p=lttng-ust.git

diff --git a/README b/README
index 78ed56f6..55c72df7 100644
--- a/README
+++ b/README
@@ -16,7 +16,7 @@ PREREQUISITES:
   - liburcu
     Userspace RCU library, by Mathieu Desnoyers and Paul E. McKenney
 
-    -> This release depends on liburcu v0.6.6
+    -> This release depends on liburcu v0.7.2
 
       * Debian/Ubuntu package: liburcu-dev
       * Website:  http://lttng.org/urcu
@@ -90,15 +90,11 @@ USAGE:
     - Link application with "-ldl" on Linux, "-lc" on BSD.
     - Set a LD_PRELOAD environment to preload the tracepoint provider
       shared object before starting the application when tracing is
-      needed.
+      needed. Another way is to dlopen the tracepoint probe when needed
+      by the application.
     - Example:
       - tests/demo/   demo.c  tp*.c ust_tests_demo*.h demo-trace
 
-  - Note about dlopen() usage: due to locking side-effects due to the
-    way libc lazily resolves Thread-Local Storage (TLS) symbols when a
-    library is dlopen'd, linking the tracepoint probe or liblttng-ust
-    with dlopen() is discouraged. They should be linked with the
-    application using "-llibname" or loaded with LD_PRELOAD.
   - Enable instrumentation and control tracing with the "lttng" command
     from lttng-tools. See lttng-tools doc/quickstart.txt.
 
@@ -117,6 +113,10 @@ ENVIRONMENT VARIABLES:
     recommended for applications with time constraints on the process
     startup time.
 
+  - The compilation flag "-DLTTNG_UST_DEBUG_VALGRIND" should be enabled
+    at build time to allow liblttng-ust to be used with valgrind
+    (side-effect: disables per-cpu buffering).
+
 
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