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// Copyright 2019 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/performance_manager/mechanisms/working_set_trimmer_chromeos.h"
#include <string>
#include <utility>
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/metrics/histogram_functions.h"
#include "base/metrics/histogram_macros.h"
#include "base/sequence_checker.h"
#include "base/strings/stringprintf.h"
#include "base/task/thread_pool.h"
#include "chrome/browser/ash/arc/session/arc_session_manager.h"
#include "chrome/browser/ash/arc/vmm/arcvm_working_set_trim_executor.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chromeos/ash/experiences/arc/memory/arc_memory_bridge.h"
#include "components/performance_manager/public/graph/process_node.h"
#include "content/public/browser/browser_thread.h"
namespace performance_manager {
namespace mechanism {
namespace {
// The chromeos kernel supports per-process reclaim if there exists a /reclaim
// file in a procfs node. We will simply stat /proc/self/reclaim to detect this
// support.
bool KernelSupportsReclaim() {
return base::PathExists(base::FilePath("/proc/self/reclaim"));
}
void ReclaimWorkingSet(base::ProcessId pid) {
const std::string reclaim_file = base::StringPrintf("/proc/%d/reclaim", pid);
const std::string kReclaimMode = "all";
bool success = base::WriteFile(base::FilePath(reclaim_file), kReclaimMode);
// We won't log an error if reclaim failed due to the process being dead.
PLOG_IF(ERROR, !success && errno != ENOENT)
<< "Write failed on " << reclaim_file << " mode: " << kReclaimMode;
}
content::BrowserContext* GetContext() {
// For production, always use the primary user profile. ARCVM does not
// support non-primary profiles. |g_browser_process| can be nullptr during
// browser shutdown.
if (g_browser_process && g_browser_process->profile_manager())
return g_browser_process->profile_manager()->GetPrimaryUserProfile();
return nullptr;
}
} // namespace
// static
std::unique_ptr<WorkingSetTrimmerChromeOS>
WorkingSetTrimmerChromeOS::CreateForTesting(content::BrowserContext* context) {
auto* policy = new WorkingSetTrimmerChromeOS();
policy->context_for_testing_ = context;
return base::WrapUnique(policy);
}
WorkingSetTrimmerChromeOS::WorkingSetTrimmerChromeOS() = default;
WorkingSetTrimmerChromeOS::~WorkingSetTrimmerChromeOS() = default;
bool WorkingSetTrimmerChromeOS::PlatformSupportsWorkingSetTrim() {
static const bool kPlatformSupported = KernelSupportsReclaim();
return kPlatformSupported;
}
void WorkingSetTrimmerChromeOS::TrimWorkingSet(base::ProcessId pid) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Main thread is not allowed to block.
base::ThreadPool::PostTask(FROM_HERE, {base::MayBlock()},
base::BindOnce(&ReclaimWorkingSet, pid));
}
void WorkingSetTrimmerChromeOS::TrimArcVmWorkingSet(
TrimArcVmWorkingSetCallback callback,
ArcVmReclaimType reclaim_type,
int page_limit) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
arc::ArcVmWorkingSetTrimExecutor::Trim(
context_for_testing_ ? context_for_testing_.get() : GetContext(),
std::move(callback), reclaim_type, page_limit);
}
void WorkingSetTrimmerChromeOS::TrimWorkingSet(
const ProcessNode* process_node) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (process_node->GetProcess().IsValid()) {
TrimWorkingSet(process_node->GetProcessId());
}
}
} // namespace mechanism
} // namespace performance_manager
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