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authorDavid Sharp <dhsharp@google.com>2010-12-08 13:46:47 -0800
committerSteven Rostedt <rostedt@goodmis.org>2011-03-09 13:52:27 -0500
commit750912fa366312e9c5bc83eab352898a26750401 (patch)
treebb8e5cd1444a74ea283e3fa55607225e7fda4d70 /kernel/trace/trace.h
parent2a8247a2600c3e087a568fc68a6ec4eedac27ef1 (diff)
downloadop-kernel-dev-750912fa366312e9c5bc83eab352898a26750401.zip
op-kernel-dev-750912fa366312e9c5bc83eab352898a26750401.tar.gz
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>
Diffstat (limited to 'kernel/trace/trace.h')
-rw-r--r--kernel/trace/trace.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 856e73c..951d0b7 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -606,6 +606,7 @@ enum trace_iterator_flags {
TRACE_ITER_SLEEP_TIME = 0x40000,
TRACE_ITER_GRAPH_TIME = 0x80000,
TRACE_ITER_RECORD_CMD = 0x100000,
+ TRACE_ITER_OVERWRITE = 0x200000,
};
/*
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