-LTTng 0.x clocks will be added back soon into LTTng 2.0. Please note
-that lttng-modules 2.0 can build on a Linux kernel patched with the
-LTTng 0.x patchset, but the lttng-modules 2.0 replace the lttng-modules
-0.x, so both tracers cannot be installed at the same time for a given
-kernel version.
-
-LTTng-modules depends on having kallsyms enabled in the kernel it is
-built against. Ideally, if you want to have system call tracing, the
-"Trace Syscalls" feature should be enabled too.
+LTTng 0.x clocks will be added back soon into LTTng 2.0.
+
+
+* Kernel config options required
+
+CONFIG_MODULES: required
+ * Kernel modules support.
+CONFIG_KALLSYMS: required
+ * See wrapper/ files. This is necessary until the few required missing
+ symbols are exported to GPL modules from mainline.
+CONFIG_HIGH_RES_TIMERS: required
+ * Needed for LTTng 2.0 clock source.
+CONFIG_TRACEPOINTS: required
+ kernel tracepoint instrumentation
+ * Enabled as side-effect of any of the perf/ftrace/blktrace
+ instrumentation features.
+
+
+* Kernel config options supported (optional)
+
+The following kernel configuration options will affect the features
+available from LTTng:
+
+
+CONFIG_HAVE_SYSCALL_TRACEPOINTS:
+ system call tracing
+ lttng enable-event -k --syscall
+ lttng enable-event -k -a
+CONFIG_PERF_EVENTS:
+ performance counters
+ lttng add-context -t perf:*
+CONFIG_EVENT_TRACING:
+ needed to allow block layer tracing
+CONFIG_KPROBES:
+ Dynamic probe.
+ lttng enable-event -k --probe ...
+CONFIG_KRETPROBES:
+ Dynamic function entry/return probe.
+ lttng enable-event -k --function ...
+