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Kernel+LibC: Make all SharedBuffers purgeable (default: non-volatile)
This patch makes SharedBuffer use a PurgeableVMObject as its underlying memory object. A new syscall is added to control the volatile flag of a SharedBuffer.
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6 changed files with 50 additions and 5 deletions
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@ -1,8 +1,8 @@
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#pragma once
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#include <AK/OwnPtr.h>
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#include <Kernel/VM/AnonymousVMObject.h>
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#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/VM/PurgeableVMObject.h>
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struct SharedBuffer {
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private:
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@ -20,7 +20,7 @@ private:
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public:
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SharedBuffer(int id, int size)
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: m_shared_buffer_id(id)
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, m_vmobject(AnonymousVMObject::create_with_size(size))
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, m_vmobject(PurgeableVMObject::create_with_size(size))
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{
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#ifdef SHARED_BUFFER_DEBUG
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dbgprintf("Created shared buffer %d of size %d\n", m_shared_buffer_id, size);
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@ -44,12 +44,14 @@ public:
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size_t size() const { return m_vmobject->size(); }
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void destroy_if_unused();
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void seal();
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PurgeableVMObject& vmobject() { return m_vmobject; }
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const PurgeableVMObject& vmobject() const { return m_vmobject; }
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int id() const { return m_shared_buffer_id; }
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int m_shared_buffer_id { -1 };
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bool m_writable { true };
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bool m_global { false };
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NonnullRefPtr<AnonymousVMObject> m_vmobject;
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NonnullRefPtr<PurgeableVMObject> m_vmobject;
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Vector<Reference, 2> m_refs;
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unsigned m_total_refs { 0 };
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};
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