diff options
| author | Li Zefan <lizf@cn.fujitsu.com> | 2009-08-31 16:49:41 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-08-31 10:58:08 +0200 |
| commit | 8e254c1d183f0225ad21f9049641529e56cce4da (patch) | |
| tree | 5b559726a38b60c6bc92b3c8667c676db1038701 /include/linux/ftrace_event.h | |
| parent | 73222acf966792c7fda219724af963339be32e62 (diff) | |
| download | linux-8e254c1d183f0225ad21f9049641529e56cce4da.tar.gz linux-8e254c1d183f0225ad21f9049641529e56cce4da.tar.bz2 linux-8e254c1d183f0225ad21f9049641529e56cce4da.zip | |
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.h | 1 |
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 { #define MAX_FILTER_PRED 32 #define MAX_FILTER_STR_VAL 128 -extern int init_preds(struct ftrace_event_call *call); extern void destroy_preds(struct ftrace_event_call *call); extern int filter_match_preds(struct ftrace_event_call *call, void *rec); extern int filter_current_check_discard(struct ftrace_event_call *call, |