mirror of
https://github.com/RGBCube/serenity
synced 2025-07-25 14:07:46 +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
29
Userland/profile.cpp
Normal file
29
Userland/profile.cpp
Normal file
|
@ -0,0 +1,29 @@
|
|||
#include <serenity.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
int main(int argc, char** argv)
|
||||
{
|
||||
if (argc != 3) {
|
||||
printf("usage: profile <pid> <on|off>\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
pid_t pid = atoi(argv[1]);
|
||||
bool enabled = !strcmp(argv[2], "on");
|
||||
|
||||
if (enabled) {
|
||||
if (profiling_enable(pid) < 0) {
|
||||
perror("profiling_enable");
|
||||
return 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (profiling_disable(pid) < 0) {
|
||||
perror("profiling_disable");
|
||||
return 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
Loading…
Add table
Add a link
Reference in a new issue