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tracing/events: reuse trace event ids after overflow

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With modules being able to add trace events, and the max trace event
counter is 16 bits (65536) we can overflow the counter easily
with a simple while loop adding and removing modules that contain
trace events.

This patch links together the registered trace events and on overflow
searches for available trace event ids. It will still fail if
over 65536 events are registered, but considering that a typical
kernel only has 22000 functions, 65000 events should be sufficient.

Reported-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2009-04-24 12:20:52 -04:00 • committed by Steven Rostedt
commit 060fa5c83e
2 changed files with 61 additions and 11 deletions
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1
include/linux/ftrace_event.h
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@ -56,6 +56,7 @@ typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
int flags);
struct trace_event {
struct hlist_node node;
struct list_head list;
int type;
trace_print_func trace;
trace_print_func raw;