tracing: Add snapshot at end of kernel boot up

[sfrench/cifs-2.6.git] / Documentation / admin-guide / kernel-parameters.txt

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index f5a27f067db9ed97da621036f111f881d3aa3561..f6b7ee64ace8d2cf5b201ec08d166e5b9169aa88 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1435,6 +1435,14 @@
                        as early as possible in order to facilitate early
                        boot debugging.
 
+       ftrace_boot_snapshot
+                       [FTRACE] On boot up, a snapshot will be taken of the
+                       ftrace ring buffer that can be read at:
+                       /sys/kernel/tracing/snapshot.
+                       This is useful if you need tracing information from kernel
+                       boot up that is likely to be overridden by user space
+                       start up functionality.
+
        ftrace_dump_on_oops[=orig_cpu]
                        [FTRACE] will dump the trace buffers on oops.
                        If no parameter is passed, ftrace will dump