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Profiler: Use sequential serial numbers for profiling events

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Previously Profiler was using timestamps to distinguish processes.
However it is possible that separate processes with the same PID exist
at the exact same timestamp (e.g. for execve). This changes Profiler
to use unique serial numbers for each event instead.
This commit is contained in:
Gunnar Beutner 2021-06-02 21:16:57 +02:00 • committed by Linus Groh
parent af72b5ec82
commit a607f13fc7
8 changed files with 125 additions and 47 deletions
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23
Userland/DevTools/Profiler/Process.h
View file

@ -6,6 +6,7 @@
#pragma once
#include "EventSerialNumber.h"
#include <AK/HashMap.h>
#include <AK/MappedFile.h>
#include <AK/OwnPtr.h>
@ -42,12 +43,12 @@ private:
struct Thread {
pid_t tid;
u64 start_valid;
u64 end_valid { 0 };
EventSerialNumber start_valid;
EventSerialNumber end_valid;
bool valid_at(u64 timestamp) const
bool valid_at(EventSerialNumber serial) const
{
return timestamp >= start_valid && (end_valid == 0 || timestamp <= end_valid);
return serial >= start_valid && (end_valid == EventSerialNumber {} || serial <= end_valid);
}
};
@ -57,16 +58,16 @@ struct Process {
String basename;
HashMap<int, Vector<Thread>> threads {};
LibraryMetadata library_metadata {};
u64 start_valid;
u64 end_valid { 0 };
EventSerialNumber start_valid;
EventSerialNumber end_valid;
Thread* find_thread(pid_t tid, u64 timestamp);
void handle_thread_create(pid_t tid, u64 timestamp);
void handle_thread_exit(pid_t tid, u64 timestamp);
Thread* find_thread(pid_t tid, EventSerialNumber serial);
void handle_thread_create(pid_t tid, EventSerialNumber serial);
void handle_thread_exit(pid_t tid, EventSerialNumber serial);
bool valid_at(u64 timestamp) const
bool valid_at(EventSerialNumber serial) const
{
return timestamp >= start_valid && (end_valid == 0 || timestamp <= end_valid);
return serial >= start_valid && (end_valid == EventSerialNumber {} || serial <= end_valid);
}
};