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authorLi Zefan <lizf@cn.fujitsu.com>2009-08-31 16:49:41 +0800
committerIngo Molnar <mingo@elte.hu>2009-08-31 10:58:08 +0200
commit8e254c1d183f0225ad21f9049641529e56cce4da (patch)
tree5b559726a38b60c6bc92b3c8667c676db1038701 /kernel/trace/trace_export.c
parent73222acf966792c7fda219724af963339be32e62 (diff)
downloadlinux-8e254c1d183f0225ad21f9049641529e56cce4da.tar.bz2
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 'kernel/trace/trace_export.c')
-rw-r--r--kernel/trace/trace_export.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 029a91f42287..df1bf6e48bb9 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -135,7 +135,6 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
static int ftrace_raw_init_event_##call(void) \
{ \
INIT_LIST_HEAD(&event_##call.fields); \
- init_preds(&event_##call); \
return 0; \
} \