From 936e4abc765ebc360dc97fa13ec2905cabf109ac Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Wed, 8 Feb 2012 09:37:11 -0500 Subject: [PATCH] Update README Signed-off-by: Mathieu Desnoyers --- README | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/README b/README index f4e3368c..1fd49b68 100644 --- a/README +++ b/README @@ -1,7 +1,7 @@ LTTng 2.0 modules Mathieu Desnoyers -July 19, 2011 +February 8, 2012 LTTng 2.0 kernel modules build against a vanilla or distribution kernel, without need for additional patches. Other features: @@ -36,9 +36,6 @@ the kernel modules when needed. Use Babeltrace to print traces as a human-readable text log. These tools are available at the following URL: http://lttng.org/lttng2.0 -Please note that the LTTng-UST 2.0 (user-space tracing counterpart of LTTng 2.0) -is still in active development and not released yet. - So far, it has been tested on vanilla Linux kernels 2.6.38, 2.6.39 and 3.0 (on x86 32/64-bit, and powerpc 32-bit at the moment, build tested on ARM). It should work fine with newer kernels and other architectures, but expect build issues @@ -49,6 +46,10 @@ 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. + * Note about Perf PMU counters support Each PMU counter has its zero value set when it is attached to a context with -- 2.34.1