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| author | Zheng Yejian <zhengyejian1@huawei.com> | 2022-11-10 10:03:19 +0800 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2022-11-23 19:08:31 -0500 |
| commit | 96e6122cb79616c622ae0d025eb9f981120b568d (patch) | |
| tree | 27a0016f9f2a0aacc103086354513c77b2f16136 /include/linux/trace_events.h | |
| parent | a76d4648a0bbd624a1322c15073b5032a5135f01 (diff) | |
| download | linux-stable-96e6122cb79616c622ae0d025eb9f981120b568d.tar.gz linux-stable-96e6122cb79616c622ae0d025eb9f981120b568d.tar.bz2 linux-stable-96e6122cb79616c622ae0d025eb9f981120b568d.zip | |
tracing: Optimize event type allocation with IDA
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 <zhengyejian1@huawei.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/trace_events.h')
| -rw-r--r-- | include/linux/trace_events.h | 1 |
1 files changed, 0 insertions, 1 deletions
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; }; |