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authorSteven Rostedt <srostedt@redhat.com>2009-04-24 12:20:52 -0400
committerSteven Rostedt <rostedt@goodmis.org>2009-04-24 23:06:00 -0400
commit060fa5c83e67901ba47ab484cfcdb32737d630ba (patch)
treec83ec27ae1064cfb290904f95cb85b3b0889b2a1 /include/linux/ftrace_event.h
parentb8e65554d80b4c560d201362d0e8fa02109d89fd (diff)
downloadblackbird-op-linux-060fa5c83e67901ba47ab484cfcdb32737d630ba.tar.gz
blackbird-op-linux-060fa5c83e67901ba47ab484cfcdb32737d630ba.zip
tracing/events: reuse trace event ids after overflow
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>
Diffstat (limited to 'include/linux/ftrace_event.h')
-rw-r--r--include/linux/ftrace_event.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 07e0a6d64a24..78a9ba24cbf6 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -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;
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