branch master updated: gnu: Add lttng-ust.

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     new a69bc73  gnu: Add lttng-ust.
a69bc73 is described below

commit a69bc7386f22687015bcb326e7f13f353b8fedc4
Author: Pierre Neidhardt <address@hidden>
AuthorDate: Thu Feb 27 14:06:57 2020 +0100

    gnu: Add lttng-ust.
    
    * gnu/packages/linux.scm (lttng-ust): New variable.
---
 gnu/packages/linux.scm | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/gnu/packages/linux.scm b/gnu/packages/linux.scm
index 7818255..0b65662 100644
--- a/gnu/packages/linux.scm
+++ b/gnu/packages/linux.scm
@@ -39,6 +39,7 @@
 ;;; Copyright © 2019 Brice Waegeneire <address@hidden>
 ;;; Copyright © 2019 Kei Kebreau <address@hidden>
 ;;; Copyright © 2020 Oleg Pykhalov <address@hidden>
+;;; Copyright © 2020 Pierre Neidhardt <address@hidden>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -6382,3 +6383,28 @@ the Linux kernel, C standard library, and libdl (for 
dynamic linking).  While
 ELL is designed to be efficient and compact enough for use on embedded Linux
 platforms, it is not limited to resource-constrained systems.")
     (license license:lgpl2.1+)))
+
+(define-public lttng-ust
+  (package
+    (name "lttng-ust")
+    (version "2.11.0")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "https://lttng.org/files/lttng-ust/";
+                                  "lttng-ust-" version ".tar.bz2"))
+              (sha256
+               (base32
+                "1n646yz7882svf5a4ay3vqiiz3qjn3pgkkij9kk22871wp7q0ck8"))))
+    (build-system gnu-build-system)
+    (inputs
+     `(("liburcu" ,liburcu)
+       ("numactl" ,numactl)))
+    (native-inputs
+     `(("python" ,python-3)))
+    (home-page "https://lttng.org/";)
+    (synopsis "LTTng userspace tracer libraries")
+    (description "The user space tracing library, liblttng-ust, is the LTTng
+user space tracer.  It receives commands from a session daemon, for example to
+enable and disable specific instrumentation points, and writes event records
+to ring buffers shared with a consumer daemon.")
+    (license license:lgpl2.1+)))