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Kernel: Start work on full system profiling :^)

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The superuser can now call sys$profiling_enable() with PID -1 to enable
profiling of all running threads in the system. The perf events are
collected in a global PerformanceEventBuffer (currently 32 MiB in size.)

The events can be accessed via /proc/profile
This commit is contained in:
Andreas Kling 2021-03-02 17:19:35 +01:00
parent b425c2602c
commit ea500dd3e3
5 changed files with 91 additions and 23 deletions
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24
Kernel/Syscalls/profiling.cpp
View file

@ -32,9 +32,25 @@
namespace Kernel {
PerformanceEventBuffer* g_global_perf_events;
bool g_profiling_all_threads;
KResultOr<int> Process::sys$profiling_enable(pid_t pid)
{
REQUIRE_NO_PROMISES;
if (pid == -1) {
if (!is_superuser())
return EPERM;
ScopedCritical critical;
if (g_global_perf_events)
g_global_perf_events->clear();
else
g_global_perf_events = PerformanceEventBuffer::try_create_with_size(32 * MiB).leak_ptr();
g_profiling_all_threads = true;
return 0;
}
ScopedSpinLock lock(g_processes_lock);
auto process = Process::from_pid(pid);
if (!process)
@ -51,6 +67,14 @@ KResultOr<int> Process::sys$profiling_enable(pid_t pid)
KResultOr<int> Process::sys$profiling_disable(pid_t pid)
{
if (pid == -1) {
if (!is_superuser())
return EPERM;
ScopedCritical critical;
g_profiling_all_threads = false;
return 0;
}
ScopedSpinLock lock(g_processes_lock);
auto process = Process::from_pid(pid);
if (!process)