blob: a32b61d3f394e15456261cc187b2483ac6a2c60b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_MEMORY_TAB_MANAGER_DELEGATE_CHROMEOS_H_
#define CHROME_BROWSER_MEMORY_TAB_MANAGER_DELEGATE_CHROMEOS_H_
#include <utility>
#include <vector>
#include "base/containers/hash_tables.h"
#include "base/gtest_prod_util.h"
#include "base/process/process.h"
#include "base/timer/timer.h"
#include "chrome/browser/memory/tab_manager.h"
#include "chrome/browser/memory/tab_stats.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
namespace memory {
// The Chrome OS TabManagerDelegate is responsible for keeping the
// renderers' scores up to date in /proc/<pid>/oom_score_adj.
//
// Note that AdjustOomPriorities will be called on the UI thread by
// TabManager, but the actual work will take place on the file thread
// (see implementation of AdjustOomPriorities).
class TabManagerDelegate : public content::NotificationObserver {
public:
TabManagerDelegate();
~TabManagerDelegate() override;
// Return the score of a process.
int GetOomScore(int child_process_host_id);
// Called when the timer fires, sets oom_adjust_score for all renderers.
void AdjustOomPriorities(const TabStatsList& stats_list);
private:
FRIEND_TEST_ALL_PREFIXES(TabManagerDelegateTest, GetProcessHandles);
// content::NotificationObserver:
void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) override;
// Pair to hold child process host id and ProcessHandle.
typedef std::pair<int, base::ProcessHandle> ProcessInfo;
// Returns a list of child process host ids and ProcessHandles from
// |stats_list| with unique pids. If multiple tabs use the same process,
// returns the first child process host id and corresponding pid. This implies
// that the processes are selected based on their "most important" tab.
static std::vector<ProcessInfo> GetChildProcessInfos(
const TabStatsList& stats_list);
// Called by AdjustOomPriorities.
void AdjustOomPrioritiesOnFileThread(TabStatsList stats_list);
// Posts AdjustFocusedTabScore task to the file thread.
void OnFocusTabScoreAdjustmentTimeout();
// Sets the score of the focused tab to the least value.
void AdjustFocusedTabScoreOnFileThread();
// Registrar to receive renderer notifications.
content::NotificationRegistrar registrar_;
// Timer to guarantee that the tab is focused for a certain amount of time.
base::OneShotTimer focus_tab_score_adjust_timer_;
// This lock is for |oom_score_map_| and |focused_tab_process_info_|.
base::Lock oom_score_lock_;
// Map maintaining the child process host id - oom_score mapping.
typedef base::hash_map<int, int> ProcessScoreMap;
ProcessScoreMap oom_score_map_;
// Holds the focused tab's child process host id.
ProcessInfo focused_tab_process_info_;
DISALLOW_COPY_AND_ASSIGN(TabManagerDelegate);
};
} // namespace memory
#endif // CHROME_BROWSER_MEMORY_TAB_MANAGER_DELEGATE_CHROMEOS_H_
|
