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authorLi Zefan <lizf@cn.fujitsu.com>2009-08-31 04:49:41 -0400
committerIngo Molnar <mingo@elte.hu>2009-08-31 04:58:08 -0400
commit8e254c1d183f0225ad21f9049641529e56cce4da (patch)
tree5b559726a38b60c6bc92b3c8667c676db1038701 /include/linux/ftrace_event.h
parent73222acf966792c7fda219724af963339be32e62 (diff)
tracing/filters: Defer pred allocation
init_preds() allocates about 5392 bytes of memory (on x86_32) for a TRACE_EVENT. With my config, at system boot total memory occupied is: 5392 * (642 + 15) == 3459KB 642 == cat available_events | wc -l 15 == number of dirs in events/ftrace That's quite a lot, so we'd better defer memory allocation util it's needed, that's when filter is used. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Tom Zanussi <tzanussi@gmail.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> LKML-Reference: <4A9B8EA5.6020700@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/ftrace_event.h')
-rw-r--r--include/linux/ftrace_event.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index ace2da9e0a0d..755480484eb6 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -133,7 +133,6 @@ struct ftrace_event_call {
133#define MAX_FILTER_PRED 32 133#define MAX_FILTER_PRED 32
134#define MAX_FILTER_STR_VAL 128 134#define MAX_FILTER_STR_VAL 128
135 135
136extern int init_preds(struct ftrace_event_call *call);
137extern void destroy_preds(struct ftrace_event_call *call); 136extern void destroy_preds(struct ftrace_event_call *call);
138extern int filter_match_preds(struct ftrace_event_call *call, void *rec); 137extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
139extern int filter_current_check_discard(struct ftrace_event_call *call, 138extern int filter_current_check_discard(struct ftrace_event_call *call,