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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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@ -1,4 +1,5 @@
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#include <AK/kmalloc.h>
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#include <Kernel/Syscall.h>
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#include <SharedBuffer.h>
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#include <stdio.h>
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#include <unistd.h>
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@ -64,3 +65,19 @@ void SharedBuffer::seal()
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ASSERT_NOT_REACHED();
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}
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}
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void SharedBuffer::set_volatile()
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{
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u32 rc = syscall(SC_set_shared_buffer_volatile, m_shared_buffer_id, true);
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ASSERT(rc == 0);
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}
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bool SharedBuffer::set_nonvolatile()
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{
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u32 rc = syscall(SC_set_shared_buffer_volatile, m_shared_buffer_id, false);
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if (rc == 0)
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return true;
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if (rc == 1)
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return false;
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ASSERT_NOT_REACHED();
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}
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@ -1,7 +1,7 @@
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#pragma once
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#include <AK/RefPtr.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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class SharedBuffer : public RefCounted<SharedBuffer> {
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public:
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@ -15,6 +15,8 @@ public:
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int size() const { return m_size; }
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void* data() { return m_data; }
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const void* data() const { return m_data; }
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void set_volatile();
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[[nodiscard]] bool set_nonvolatile();
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private:
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SharedBuffer(int shared_buffer_id, int size, void*);
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