750912fa366312e9c5bc83eab352898a26750401 - arm/linux

commit	750912fa366312e9c5bc83eab352898a26750401	[log] [tgz]
author	David Sharp <dhsharp@google.com>	Wed Dec 08 13:46:47 2010 -0800
committer	Steven Rostedt <rostedt@goodmis.org>	Wed Mar 09 13:52:27 2011 -0500
tree	bb8e5cd1444a74ea283e3fa55607225e7fda4d70
parent	2a8247a2600c3e087a568fc68a6ec4eedac27ef1 [diff]

tracing: Add an 'overwrite' trace_option.

Add an "overwrite" trace_option for ftrace to control whether the buffer should
be overwritten on overflow or not. The default remains to overwrite old events
when the buffer is full. This patch adds the option to instead discard newest
events when the buffer is full. This is useful to get a snapshot of traces just
after enabling traces. Dropping the current event is also a simpler code path.

Signed-off-by: David Sharp <dhsharp@google.com>
LKML-Reference: <1291844807-15481-1-git-send-email-dhsharp@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

Documentation/trace/ftrace.txt[diff]
include/linux/ring_buffer.h[diff]
kernel/trace/ring_buffer.c[diff]
kernel/trace/trace.c[diff]
kernel/trace/trace.h[diff]

5 files changed

tree: bb8e5cd1444a74ea283e3fa55607225e7fda4d70