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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/dbus_memory_pressure_evaluator_linux.h"
#include <utility>
#include "base/containers/contains.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/memory/memory_pressure_listener.h"
#include "base/memory/scoped_refptr.h"
#include "chrome/common/chrome_features.h"
#include "components/dbus/thread_linux/dbus_thread_linux.h"
#include "components/dbus/utils/check_for_service_and_start.h"
#include "dbus/message.h"
#include "dbus/object_path.h"
#include "dbus/object_proxy.h"
const char DbusMemoryPressureEvaluatorLinux::kLmmService[] =
"org.freedesktop.LowMemoryMonitor";
const char DbusMemoryPressureEvaluatorLinux::kLmmObject[] =
"/org/freedesktop/LowMemoryMonitor";
const char DbusMemoryPressureEvaluatorLinux::kLmmInterface[] =
"org.freedesktop.LowMemoryMonitor";
const char DbusMemoryPressureEvaluatorLinux::kXdgPortalService[] =
"org.freedesktop.portal.Desktop";
const char DbusMemoryPressureEvaluatorLinux::kXdgPortalObject[] =
"/org/freedesktop/portal/desktop";
const char
DbusMemoryPressureEvaluatorLinux::kXdgPortalMemoryMonitorInterface[] =
"org.freedesktop.portal.MemoryMonitor";
const char DbusMemoryPressureEvaluatorLinux::kLowMemoryWarningSignal[] =
"LowMemoryWarning";
// LMM emits signals every 15 seconds on pressure, so if we've been quiet for 20
// seconds, the pressure is likely cleared up.
const base::TimeDelta DbusMemoryPressureEvaluatorLinux::kResetVotePeriod =
base::Seconds(20);
DbusMemoryPressureEvaluatorLinux::DbusMemoryPressureEvaluatorLinux(
std::unique_ptr<memory_pressure::MemoryPressureVoter> voter)
: DbusMemoryPressureEvaluatorLinux(std::move(voter), nullptr, nullptr) {
// Only start the service checks in the public constructor, so the tests can
// have time to set up mocks first when using the private constructor.
CheckIfLmmIsAvailable();
}
DbusMemoryPressureEvaluatorLinux::DbusMemoryPressureEvaluatorLinux(
std::unique_ptr<memory_pressure::MemoryPressureVoter> voter,
scoped_refptr<dbus::Bus> system_bus,
scoped_refptr<dbus::Bus> session_bus)
: memory_pressure::SystemMemoryPressureEvaluator(std::move(voter)),
system_bus_(system_bus),
session_bus_(session_bus) {
moderate_level_ = features::kLinuxLowMemoryMonitorModerateLevel.Get();
critical_level_ = features::kLinuxLowMemoryMonitorCriticalLevel.Get();
CHECK(critical_level_ > moderate_level_);
}
DbusMemoryPressureEvaluatorLinux::~DbusMemoryPressureEvaluatorLinux() {
if (system_bus_) {
system_bus_->ShutdownOnDBusThreadAndBlock();
system_bus_.reset();
}
if (session_bus_) {
session_bus_->ShutdownOnDBusThreadAndBlock();
session_bus_.reset();
}
}
void DbusMemoryPressureEvaluatorLinux::CheckIfLmmIsAvailable() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!system_bus_) {
system_bus_ = dbus_thread_linux::GetSharedSystemBus();
}
dbus_utils::CheckForServiceAndStart(
system_bus_, kLmmService,
base::BindOnce(
&DbusMemoryPressureEvaluatorLinux::CheckIfLmmIsAvailableResponse,
weak_ptr_factory_.GetWeakPtr()));
}
void DbusMemoryPressureEvaluatorLinux::CheckIfLmmIsAvailableResponse(
std::optional<bool> is_available) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (is_available.value_or(false)) {
VLOG(1) << "LMM is available, using " << kLmmInterface;
object_proxy_ =
system_bus_->GetObjectProxy(kLmmService, dbus::ObjectPath(kLmmObject));
object_proxy_->ConnectToSignal(
kLmmInterface, kLowMemoryWarningSignal,
base::BindRepeating(
&DbusMemoryPressureEvaluatorLinux::OnLowMemoryWarning,
weak_ptr_factory_.GetWeakPtr()),
base::BindOnce(&DbusMemoryPressureEvaluatorLinux::OnSignalConnected,
weak_ptr_factory_.GetWeakPtr()));
} else {
VLOG(1) << "LMM is not available, checking for portal";
system_bus_.reset();
CheckIfPortalIsAvailable();
}
}
void DbusMemoryPressureEvaluatorLinux::CheckIfPortalIsAvailable() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!session_bus_) {
session_bus_ = dbus_thread_linux::GetSharedSessionBus();
}
dbus_utils::CheckForServiceAndStart(
session_bus_, kXdgPortalService,
base::BindOnce(
&DbusMemoryPressureEvaluatorLinux::CheckIfPortalIsAvailableResponse,
weak_ptr_factory_.GetWeakPtr()));
}
void DbusMemoryPressureEvaluatorLinux::CheckIfPortalIsAvailableResponse(
std::optional<bool> is_available) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (is_available.value_or(false)) {
VLOG(1) << "Portal is available, using "
<< kXdgPortalMemoryMonitorInterface;
object_proxy_ = session_bus_->GetObjectProxy(
kXdgPortalService, dbus::ObjectPath(kXdgPortalObject));
object_proxy_->ConnectToSignal(
kXdgPortalMemoryMonitorInterface, kLowMemoryWarningSignal,
base::BindRepeating(
&DbusMemoryPressureEvaluatorLinux::OnLowMemoryWarning,
weak_ptr_factory_.GetWeakPtr()),
base::BindOnce(&DbusMemoryPressureEvaluatorLinux::OnSignalConnected,
weak_ptr_factory_.GetWeakPtr()));
} else {
VLOG(1) << "No memory monitor found";
session_bus_.reset();
}
}
void DbusMemoryPressureEvaluatorLinux::OnSignalConnected(
const std::string& interface,
const std::string& signal,
bool connected) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!connected) {
LOG(WARNING) << "Failed to connect to " << interface << '.' << signal;
system_bus_.reset();
session_bus_.reset();
}
}
void DbusMemoryPressureEvaluatorLinux::OnLowMemoryWarning(
dbus::Signal* signal) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
dbus::MessageReader reader(signal);
uint8_t lmm_level;
if (!reader.PopByte(&lmm_level)) {
LOG(WARNING) << "Failed to parse low memory level";
return;
}
// static_cast is needed as lmm_level is a uint8_t, which is often an alias to
// char, meaning that sending it to the output stream would just print the
// character representation rather than the numeric representation.
VLOG(1) << "Monitor sent memory pressure level: "
<< static_cast<int>(lmm_level);
base::MemoryPressureListener::MemoryPressureLevel new_level =
LmmToBasePressureLevel(lmm_level);
VLOG(1) << "MemoryPressureLevel: " << new_level;
UpdateLevel(new_level);
}
base::MemoryPressureListener::MemoryPressureLevel
DbusMemoryPressureEvaluatorLinux::LmmToBasePressureLevel(uint8_t lmm_level) {
if (lmm_level >= critical_level_) {
return base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL;
}
if (lmm_level >= moderate_level_) {
return base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE;
}
return base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE;
}
void DbusMemoryPressureEvaluatorLinux::UpdateLevel(
base::MemoryPressureListener::MemoryPressureLevel new_level) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
reset_vote_timer_.Stop();
SetCurrentVote(new_level);
switch (new_level) {
case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE:
// By convention no notifications are sent when returning to NONE level.
SendCurrentVote(false);
break;
case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE:
case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL:
SendCurrentVote(true);
reset_vote_timer_.Start(
FROM_HERE, kResetVotePeriod,
base::BindOnce(
&DbusMemoryPressureEvaluatorLinux::UpdateLevel,
weak_ptr_factory_.GetWeakPtr(),
base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE));
break;
}
}
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