Merge tag 'trace-v4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux...

[mirror_ubuntu-bionic-kernel.git] / Documentation / trace / ftrace.txt

diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index 072d3c4d57539344871424c28ca841311d675c91..ef621d34ba5bf7a5a3c2d570de2ebaecf0615cc0 100644 (file)
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -346,6 +346,11 @@ of ftrace. Here is a list of some of the key files:
          x86-tsc: Architectures may define their own clocks. For
                   example, x86 uses its own TSC cycle clock here.
 
+         ppc-tb: This uses the powerpc timebase register value.
+                 This is in sync across CPUs and can also be used
+                 to correlate events across hypervisor/guest if
+                 tb_offset is known.
+
        To set a clock, simply echo the clock name into this file.
 
          echo global > trace_clock