• Li Zefan's avatar
    tracing/filters: Defer pred allocation · 8e254c1d
    Li Zefan authored
    init_preds() allocates about 5392 bytes of memory (on x86_32) for
    a TRACE_EVENT. With my config, at system boot total memory occupied
    	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: default avatarLi 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: default avatarIngo Molnar <mingo@elte.hu>
ftrace_event.h 4.86 KB