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Profiler: Fix loading profiles which previously would crash the profiler

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The profiler tried to be clever when handling process_exit events by
subtracting one from the timestamp. This was supposed to ensure that
events after a process' death would be attributed to the new process
in case the old process used execve(). However, if there was another
event (e.g. a CPU sample) at the exact same time the process_exit
event was recorded the profile would fail to load because we
didn't find the process anymore.

This changes introduces a new problem where samples would be attributed
to the incorrect process if a CPU sample for the old process, a
process_exit as well as a process_create event plus another CPU sample
event for the new process happened at the exact same time. I think
it's a reasonable compromise though.
This commit is contained in:
Gunnar Beutner 2021-06-01 17:22:23 +02:00 • committed by Andreas Kling
parent 21a62fe836
commit 15b69eef66
1 changed files with 2 additions and 2 deletions
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4
Userland/DevTools/Profiler/Profile.cpp
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@ -267,7 +267,7 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
event.executable = perf_event.get("executable").to_string();
auto old_process = current_processes.get(event.pid).value();
old_process->end_valid = event.timestamp - 1;
old_process->end_valid = event.timestamp;
current_processes.remove(event.pid);
@ -282,7 +282,7 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
continue;
} else if (event.type == "process_exit"sv) {
auto old_process = current_processes.get(event.pid).value();
old_process->end_valid = event.timestamp - 1;
old_process->end_valid = event.timestamp;
current_processes.remove(event.pid);
continue;