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Kernel: Add a basic thread boosting mechanism

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This patch introduces a syscall:

    int set_thread_boost(int tid, int amount)

You can use this to add a permanent boost value to the effective thread
priority of any thread with your UID (or any thread in the system if
you are the superuser.)

This is quite crude, but opens up some interesting opportunities. :^)
This commit is contained in:
Andreas Kling 2019-12-30 19:23:13 +01:00
parent 50677bf806
commit 610f3ad12f
7 changed files with 46 additions and 2 deletions
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16
Kernel/Process.cpp
View file

@ -3906,3 +3906,19 @@ int Process::sys$futex(const Syscall::SC_futex_params* params)
return 0;
}
int Process::sys$set_thread_boost(int tid, int amount)
{
if (amount < 0 || amount > 20)
return -EINVAL;
InterruptDisabler disabler;
auto* thread = Thread::from_tid(tid);
if (!thread)
return -ESRCH;
if (thread->state() == Thread::State::Dead || thread->state() == Thread::State::Dying)
return -ESRCH;
if (!is_superuser() && thread->process().uid() != euid())
return -EPERM;
thread->set_priority_boost(amount);
return 0;
}