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Kernel+LibC: Make all SharedBuffers purgeable (default: non-volatile)

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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.
This commit is contained in:
Andreas Kling 2019-12-09 20:06:47 +01:00
parent 65229a4082
commit 0317ca5ccc
6 changed files with 50 additions and 5 deletions
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8
Kernel/SharedBuffer.h
View file

@ -1,8 +1,8 @@
#pragma once
#include <AK/OwnPtr.h>
#include <Kernel/VM/AnonymousVMObject.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/PurgeableVMObject.h>
struct SharedBuffer {
private:
@ -20,7 +20,7 @@ private:
public:
SharedBuffer(int id, int size)
: m_shared_buffer_id(id)
, m_vmobject(AnonymousVMObject::create_with_size(size))
, m_vmobject(PurgeableVMObject::create_with_size(size))
{
#ifdef SHARED_BUFFER_DEBUG
dbgprintf("Created shared buffer %d of size %d\n", m_shared_buffer_id, size);
@ -44,12 +44,14 @@ public:
size_t size() const { return m_vmobject->size(); }
void destroy_if_unused();
void seal();
PurgeableVMObject& vmobject() { return m_vmobject; }
const PurgeableVMObject& vmobject() const { return m_vmobject; }
int id() const { return m_shared_buffer_id; }
int m_shared_buffer_id { -1 };
bool m_writable { true };
bool m_global { false };
NonnullRefPtr<AnonymousVMObject> m_vmobject;
NonnullRefPtr<PurgeableVMObject> m_vmobject;
Vector<Reference, 2> m_refs;
unsigned m_total_refs { 0 };
};