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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
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13 changed files with 388 additions and 135 deletions
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@ -28,6 +28,7 @@
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#include <Kernel/Net/Socket.h>
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#include <Kernel/Process.h>
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#include <Kernel/ProcessTracer.h>
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#include <Kernel/Profiling.h>
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#include <Kernel/RTC.h>
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#include <Kernel/Scheduler.h>
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#include <Kernel/SharedBuffer.h>
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@ -3701,3 +3702,29 @@ int Process::sys$module_unload(const char* name, size_t name_length)
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g_modules->remove(it);
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return 0;
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}
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int Process::sys$profiling_enable(pid_t pid)
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{
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InterruptDisabler disabler;
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auto* process = Process::from_pid(pid);
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if (!process)
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return -ESRCH;
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if (!is_superuser() && process->uid() != m_uid)
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return -EPERM;
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Profiling::start(*process);
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process->set_profiling(true);
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return 0;
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}
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int Process::sys$profiling_disable(pid_t pid)
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{
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InterruptDisabler disabler;
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auto* process = Process::from_pid(pid);
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if (!process)
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return -ESRCH;
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if (!is_superuser() && process->uid() != m_uid)
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return -EPERM;
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process->set_profiling(false);
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Profiling::stop();
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return 0;
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}
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