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[kernel] Replace buffer_cache with vm_area_buffers

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In order to reduce the amount of tracked state, now use the
vm_area_buffers instead of a VMA with buffer_cache on top.
This commit is contained in:
Justin C. Miller
2020-09-27 15:34:24 -07:00
parent 67ebc58812
commit f7f8bb3f45
14 changed files with 161 additions and 120 deletions
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48
src/kernel/objects/vm_area.cpp
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@@ -211,3 +211,51 @@ vm_area_open::uncommit(uintptr_t offset, size_t count)
m_mapper.unmap(offset, count);
}
vm_area_buffers::vm_area_buffers(size_t size, vm_space &space, vm_flags flags, size_t buf_pages) :
m_mapper {*this, space},
m_pages {buf_pages},
m_next {memory::frame_size},
vm_area {size, flags}
{
}
uintptr_t
vm_area_buffers::get_buffer()
{
if (m_cache.count() > 0) {
return m_cache.pop();
}
uintptr_t addr = m_next;
m_next += (m_pages + 1) * memory::frame_size;
return m_mapper.space().lookup(*this, addr);
}
void
vm_area_buffers::return_buffer(uintptr_t addr)
{
m_cache.append(addr);
}
bool
vm_area_buffers::allowed(uintptr_t offset) const
{
if (offset >= m_next) return false;
// Buffers are m_pages big plus 1 leading guard page
return memory::page_align_down(offset) % (m_pages+1);
}
void
vm_area_buffers::commit(uintptr_t phys, uintptr_t offset, size_t count)
{
m_mapper.map(offset, count, phys);
}
void
vm_area_buffers::uncommit(uintptr_t offset, size_t count)
{
m_mapper.unmap(offset, count);
}