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Kernel: Make Heap implementation reusable, and make kmalloc expandable

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Add an ExpandableHeap and switch kmalloc to use it, which allows
for the kmalloc heap to grow as needed.

In order to make heap expansion to work, we keep around a 1 MiB backup
memory region, because creating a region would require space in the
same heap. This means, the heap will grow as soon as the reported
utilization is less than 1 MiB. It will also return memory if an entire
subheap is no longer needed, although that is rarely possible.
This commit is contained in:
Tom 2020-08-29 16:41:30 -06:00 • committed by Andreas Kling
parent 8ecc3d31d1
commit 4b66692a55
7 changed files with 541 additions and 132 deletions
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2
Kernel/Thread.cpp
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@ -60,7 +60,7 @@ Thread::Thread(NonnullRefPtr<Process> process)
dbg() << "Created new thread " << m_process->name() << "(" << m_process->pid().value() << ":" << m_tid.value() << ")";
#endif
set_default_signal_dispositions();
m_fpu_state = (FPUState*)kmalloc_aligned(sizeof(FPUState), 16);
m_fpu_state = (FPUState*)kmalloc_aligned<16>(sizeof(FPUState));
reset_fpu_state();
memset(&m_tss, 0, sizeof(m_tss));
m_tss.iomapbase = sizeof(TSS32);