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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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10
Kernel/FileSystem/ProcFS.cpp
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@ -474,6 +474,15 @@ static bool procfs$modules(InodeIdentifier, KBufferBuilder& builder)
return true;
}
static bool procfs$profile(InodeIdentifier, KBufferBuilder& builder)
{
extern PerformanceEventBuffer* g_global_perf_events;
if (!g_global_perf_events)
return false;
return g_global_perf_events->to_json(builder);
}
static bool procfs$pid_perf_events(InodeIdentifier identifier, KBufferBuilder& builder)
{
auto process = Process::from_pid(to_pid(identifier));
@ -1703,6 +1712,7 @@ ProcFS::ProcFS()
m_entries[FI_Root_uptime] = { "uptime", FI_Root_uptime, false, procfs$uptime };
m_entries[FI_Root_cmdline] = { "cmdline", FI_Root_cmdline, true, procfs$cmdline };
m_entries[FI_Root_modules] = { "modules", FI_Root_modules, true, procfs$modules };
m_entries[FI_Root_profile] = { "profile", FI_Root_profile, true, procfs$profile };
m_entries[FI_Root_sys] = { "sys", FI_Root_sys, true };
m_entries[FI_Root_net] = { "net", FI_Root_net, false };