mirror of
https://github.com/RGBCube/serenity
synced 2025-07-25 23:47:45 +00:00
Kernel: Implement a simple process time profiler
The kernel now supports basic profiling of all the threads in a process by calling profiling_enable(pid_t). You finish the profiling by calling profiling_disable(pid_t). This all works by recording thread stacks when the timer interrupt fires and the current thread is in a process being profiled. Note that symbolication is deferred until profiling_disable() to avoid adding more noise than necessary to the profile. A simple "/bin/profile" command is included here that can be used to start/stop profiling like so: $ profile 10 on ... wait ... $ profile 10 off After a profile has been recorded, it can be fetched in /proc/profile There are various limits (or "bugs") on this mechanism at the moment: - Only one process can be profiled at a time. - We allocate 8MB for the samples, if you use more space, things will not work, and probably break a bit. - Things will probably fall apart if the profiled process dies during profiling, or while extracing /proc/profile
This commit is contained in:
parent
adb1870628
commit
b32e961a84
13 changed files with 388 additions and 135 deletions
26
Kernel/Profiling.h
Normal file
26
Kernel/Profiling.h
Normal file
|
@ -0,0 +1,26 @@
|
|||
#pragma once
|
||||
|
||||
#include <AK/Function.h>
|
||||
#include <AK/String.h>
|
||||
#include <AK/Types.h>
|
||||
|
||||
class Process;
|
||||
|
||||
namespace Profiling {
|
||||
|
||||
constexpr size_t max_stack_frame_count = 30;
|
||||
|
||||
struct Sample {
|
||||
i32 pid;
|
||||
i32 tid;
|
||||
u64 timestamp;
|
||||
u32 frames[max_stack_frame_count];
|
||||
String symbolicated_frames[max_stack_frame_count];
|
||||
};
|
||||
|
||||
Sample& next_sample_slot();
|
||||
void start(Process&);
|
||||
void stop();
|
||||
void for_each_sample(Function<void(Sample&)>);
|
||||
|
||||
}
|
Loading…
Add table
Add a link
Reference in a new issue