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tracing: Add an 'overwrite' trace_option.

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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 <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
This commit is contained in:
David Sharp 2010-12-08 13:46:47 -08:00 • committed by Steven Rostedt
commit 750912fa36
5 changed files with 30 additions and 6 deletions
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Documentation/trace/ftrace.txt
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@ -454,6 +454,11 @@ x494] <- /root/a.out[+0x4a8] <- /lib/libc-2.7.so[+0x1e1a6]
latencies, as described in "Latency
trace format".
overwrite - This controls what happens when the trace buffer is
full. If "1" (default), the oldest events are
discarded and overwritten. If "0", then the newest
events are discarded.
ftrace_enabled
--------------