From 96e6122cb79616c622ae0d025eb9f981120b568d Mon Sep 17 00:00:00 2001 From: Zheng Yejian Date: Thu, 10 Nov 2022 10:03:19 +0800 Subject: tracing: Optimize event type allocation with IDA MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit After commit 060fa5c83e67 ("tracing/events: reuse trace event ids after overflow"), trace events with dynamic type are linked up in list 'ftrace_event_list' through field 'trace_event.list'. Then when max event type number used up, it's possible to reuse type number of some freed one by traversing 'ftrace_event_list'. As instead, using IDA to manage available type numbers can make codes simpler and then the field 'trace_event.list' can be dropped. Since 'struct trace_event' is used in static tracepoints, drop 'trace_event.list' can make vmlinux smaller. Local test with about 2000 tracepoints, vmlinux reduced about 64KB: before：-rwxrwxr-x 1 root root 76669448 Nov 8 17:14 vmlinux after： -rwxrwxr-x 1 root root 76604176 Nov 8 17:15 vmlinux Link: https://lkml.kernel.org/r/20221110020319.1259291-1-zhengyejian1@huawei.com Signed-off-by: Zheng Yejian Acked-by: Masami Hiramatsu (Google) Signed-off-by: Steven Rostedt (Google) --- include/linux/trace_events.h | 1 - 1 file changed, 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h index 20749bd9db71..bb2053246d6a 100644 --- a/include/linux/trace_events.h +++ b/include/linux/trace_events.h @@ -136,7 +136,6 @@ struct trace_event_functions { struct trace_event { struct hlist_node node; - struct list_head list; int type; struct trace_event_functions *funcs; }; -- cgit v1.2.3