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authorTörök Edwin <edwintorok@gmail.com>2008-11-22 13:28:47 +0200
committerIngo Molnar <mingo@elte.hu>2008-11-23 09:25:15 +0100
commit02b67518e2b1c490787dac7f35e1204e74fe21ba (patch)
treea3d92846e1a09a829f300ab15726ee9c288cb49e /Documentation
parenta0a70c735ef714fe1b6777b571630c3d50c7b008 (diff)
tracing: add support for userspace stacktraces in tracing/iter_ctrl
Impact: add new (default-off) tracing visualization feature Usage example: mount -t debugfs nodev /sys/kernel/debug cd /sys/kernel/debug/tracing echo userstacktrace >iter_ctrl echo sched_switch >current_tracer echo 1 >tracing_enabled .... run application ... echo 0 >tracing_enabled Then read one of 'trace','latency_trace','trace_pipe'. To get the best output you can compile your userspace programs with frame pointers (at least glibc + the app you are tracing). Signed-off-by: Török Edwin <edwintorok@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ftrace.txt5
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/ftrace.txt b/Documentation/ftrace.txt
index 753f4de4b17..79a80f79c06 100644
--- a/Documentation/ftrace.txt
+++ b/Documentation/ftrace.txt
@@ -324,7 +324,7 @@ output. To see what is available, simply cat the file:
cat /debug/tracing/trace_options
print-parent nosym-offset nosym-addr noverbose noraw nohex nobin \
- noblock nostacktrace nosched-tree
+ noblock nostacktrace nosched-tree nouserstacktrace
To disable one of the options, echo in the option prepended with "no".
@@ -378,6 +378,9 @@ Here are the available options:
When a trace is recorded, so is the stack of functions.
This allows for back traces of trace sites.
+ userstacktrace - This option changes the trace.
+ It records a stacktrace of the current userspace thread.
+
sched-tree - TBD (any users??)