2 files changed, 14 insertions, 1 deletions

diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
index 1ab0782369b1..781b019751a4 100644
--- a/tools/perf/Documentation/perf-trace.txt
+++ b/tools/perf/Documentation/perf-trace.txt
@@ -39,6 +39,11 @@ OPTIONS
         Prefixing with ! shows all syscalls but the ones specified.  You may
         need to escape it.
 
+-D msecs::
+--delay msecs::
+After starting the program, wait msecs before measuring. This is useful to
+filter out the startup phase of the program, which is often very different.
+
 -o::
 --output=::
         Output file name.
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index c298bd3e1d90..0bae454e8efa 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2310,12 +2310,17 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
         if (err < 0)
                 goto out_error_mmap;
 
-        if (!target__none(&trace->opts.target))
+        if (!target__none(&trace->opts.target) && !trace->opts.initial_delay)
                 perf_evlist__enable(evlist);
 
         if (forks)
                 perf_evlist__start_workload(evlist);
 
+        if (trace->opts.initial_delay) {
+                usleep(trace->opts.initial_delay * 1000);
+                perf_evlist__enable(evlist);
+        }
+
         trace->multiple_threads = thread_map__pid(evlist->threads, 0) == -1 ||
                                   evlist->threads->nr > 1 ||
                                   perf_evlist__first(evlist)->attr.inherit;
@@ -2816,6 +2821,9 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
                      "Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
         OPT_UINTEGER(0, "proc-map-timeout", &trace.opts.proc_map_timeout,
                         "per thread proc mmap processing timeout in ms"),
+        OPT_UINTEGER('D', "delay", &trace.opts.initial_delay,
+                     "ms to wait before starting measurement after program "
+                     "start"),
         OPT_END()
         };
         bool __maybe_unused max_stack_user_set = true;