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authorSteven Rostedt <srostedt@redhat.com>2009-03-26 11:03:29 -0400
committerSteven Rostedt <rostedt@goodmis.org>2009-04-23 23:03:19 -0400
commit89ec0dee9eba6275d47be0b878cf5f6d5c2fb6eb (patch)
tree30db465c8194f2502af497d7276710279de97a7f /include/linux/ftrace_event.h
parent9be24414aad047dcf9d8d2a9a929321536c7ebec (diff)
tracing: increase size of number of possible events
With the new event tracing registration, we must increase the number of events that can be registered. Currently the type field is only one byte, which leaves us only 256 possible events. Since we do not save the CPU number in the tracer anymore (it is determined by the per cpu ring buffer that is used) we have an extra byte to use. This patch increases the size of type from 1 byte (256 events) to 2 bytes (65,536 events). It also adds a WARN_ON_ONCE if we exceed that limit. [ Impact: allow more than 255 events ] Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Diffstat (limited to 'include/linux/ftrace_event.h')
-rw-r--r--include/linux/ftrace_event.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 2a4a40749911..07e0a6d64a24 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -16,13 +16,16 @@ struct dentry;
* bash-15816 [01] 235.197585: idle_cpu <- irq_enter
*/
struct trace_entry {
- int type;
+ unsigned short type;
unsigned char flags;
unsigned char preempt_count;
int pid;
int tgid;
};
+#define FTRACE_MAX_EVENT \
+ ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
+
/*
* Trace iterator - used by printout routines who present trace
* results to users and which routines might sleep, etc: