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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_PERFORMANCE_MANAGER_MECHANISMS_USERSPACE_SWAP_CHROMEOS_H_
#define CHROME_BROWSER_PERFORMANCE_MANAGER_MECHANISMS_USERSPACE_SWAP_CHROMEOS_H_
#include "chromeos/ash/components/memory/userspace_swap/userspace_swap.mojom.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
namespace performance_manager {
class ProcessNode;
namespace mechanism {
namespace userspace_swap {
// NOTE: All of the following methods MUST be called from the PM sequence.
// The policy must query the mechanism IsEligibleToSwap because the mechanism
// knows things that the policy doesn't related to the swap file and
// userfaultfd, this method will return false if an unexpected event that
// prevents swapping occurred.
bool IsEligibleToSwap(const ProcessNode* process_node);
// Swap a |process_node|.
void SwapProcessNode(const ProcessNode* process_node);
// Returns the number of bytes available on the device which is backing the swap
// files.
uint64_t GetSwapDeviceFreeSpaceBytes();
// Returns the number of bytes currently in use by the swap file for
// |process_node|.
uint64_t GetProcessNodeSwapFileUsageBytes(const ProcessNode* process_node);
// Returns the number of bytes that this process node has had reclaimed. Reclaim
// refers to physical memory which were swapped.
uint64_t GetProcessNodeReclaimedBytes(const ProcessNode* process_node);
// Returns the total number of bytes currently in use across all swap files.
uint64_t GetTotalSwapFileUsageBytes();
// Returns the total number of bytes which have been reclaimed.
uint64_t GetTotalReclaimedBytes();
class UserspaceSwapInitializationImpl
: public ::userspace_swap::mojom::UserspaceSwapInitialization {
public:
using MemoryRegionPtr = ::userspace_swap::mojom::MemoryRegionPtr;
explicit UserspaceSwapInitializationImpl(int render_process_host_id);
UserspaceSwapInitializationImpl(const UserspaceSwapInitializationImpl&) =
delete;
UserspaceSwapInitializationImpl& operator=(
const UserspaceSwapInitializationImpl&) = delete;
~UserspaceSwapInitializationImpl() override;
static bool UserspaceSwapSupportedAndEnabled();
static void Create(
int render_process_host_id,
mojo::PendingReceiver<
::userspace_swap::mojom::UserspaceSwapInitialization> receiver);
// UserspaceSwapInitialization impl:
void TransferUserfaultFD(uint64_t uffd_error,
mojo::PlatformHandle uffd_handle,
uint64_t mmap_error,
MemoryRegionPtr swap_area,
TransferUserfaultFDCallback cb) override;
private:
int render_process_host_id_ = 0;
bool received_transfer_cb_ = false;
};
} // namespace userspace_swap
} // namespace mechanism
} // namespace performance_manager
#endif // CHROME_BROWSER_PERFORMANCE_MANAGER_MECHANISMS_USERSPACE_SWAP_CHROMEOS_H_
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