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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/indexed_db/instance/leveldb/cleanup_scheduler.h"
#include "base/feature_list.h"
#include "base/metrics/histogram_functions.h"
#include "content/browser/indexed_db/instance/leveldb/compaction_task.h"
#include "content/browser/indexed_db/instance/leveldb/tombstone_sweeper.h"
#include "third_party/blink/public/common/indexeddb/indexeddb_metadata.h"
namespace content::indexed_db::level_db {
BASE_FEATURE(kIdbInSessionDbCleanup,
"IdbInSessionDbCleanup",
base::FEATURE_DISABLED_BY_DEFAULT);
namespace {
constexpr base::TimeDelta kMaximumTimeBetweenRuns = base::Minutes(50);
constexpr base::TimeDelta kMinimumTimeBetweenRuns = base::Minutes(30);
// To ensure the sweeper runs for database connections with a shorter
// timespan, run the first sweep after `kMinimumTimeBeforeInitialForcedRun`
// minutes.
// The last_run_ is initialized to 40 minutes in the past so short lived apps
// which accrue a lot of tombstones will get a chance to have their tombstones
// cleaned. The first sweep can be happen if there are no active transactions in
// last 4 seconds and can get postponed for another 10 minutues due to database
// activity. But after the 10 minute mark, the cleanup will be forced once the
// current transaction count reaches zero.
constexpr base::TimeDelta kMinimumTimeBeforeInitialForcedRun =
base::Minutes(10);
} // namespace
LevelDBCleanupScheduler::LevelDBCleanupScheduler(leveldb::DB* database,
Delegate* delegate)
: database_(database),
delegate_(delegate),
last_run_(base::TimeTicks::Now() - kMaximumTimeBetweenRuns +
kMinimumTimeBeforeInitialForcedRun) {}
LevelDBCleanupScheduler::~LevelDBCleanupScheduler() {
if (running_state_) {
base::UmaHistogramEnumeration(
"IndexedDB.LevelDBCleanupScheduler.PrematureTerminationPhase",
running_state_->cleanup_phase);
base::UmaHistogramCounts10000(
"IndexedDB.LevelDBCleanupScheduler.CleanerPostponedCount",
running_state_->postpone_count);
}
}
void LevelDBCleanupScheduler::OnTransactionStart() {
++active_transactions_count_;
// Do not stop the cleanup if it's past `kMaximumTimeBetweenRuns`
if (running_state_ &&
running_state_->clean_up_scheduling_timer_.IsRunning() &&
(base::TimeTicks::Now() - last_run_) < kMaximumTimeBetweenRuns) {
++running_state_->postpone_count;
running_state_->clean_up_scheduling_timer_.Stop();
}
}
void LevelDBCleanupScheduler::OnTransactionComplete() {
--active_transactions_count_;
bool scheduler_waiting_to_schedule =
running_state_ && !running_state_->clean_up_scheduling_timer_.IsRunning();
if (scheduler_waiting_to_schedule) {
// Schedule a run if there are no active transactions or the upper bound has
// been exceeded.
if (active_transactions_count_ == 0 ||
(base::TimeTicks::Now() - last_run_) > kMaximumTimeBetweenRuns) {
ScheduleNextCleanupTask(kDeferTimeAfterLastTransaction);
}
}
}
void LevelDBCleanupScheduler::Initialize() {
if (!base::FeatureList::IsEnabled(kIdbInSessionDbCleanup)) {
return;
}
if (running_state_) {
return;
}
// Initialize the `running_state` if it has been more than
// `kMinimumTimeBetweenRuns` since the last run.
if ((base::TimeTicks::Now() - last_run_) > kMinimumTimeBetweenRuns) {
running_state_.emplace();
}
}
void LevelDBCleanupScheduler::ScheduleNextCleanupTask(
const base::TimeDelta& defer_time) {
CHECK(running_state_);
running_state_->clean_up_scheduling_timer_.Start(
FROM_HERE, defer_time,
base::BindRepeating(&LevelDBCleanupScheduler::RunCleanupTask,
base::Unretained(this)));
}
void LevelDBCleanupScheduler::RunCleanupTask() {
CHECK(running_state_);
bool tombstone_sweeper_run_complete = false;
base::TimeTicks time_before_round = base::TimeTicks::Now();
switch (running_state_->cleanup_phase) {
case Phase::kRunScheduled:
running_state_->cleanup_phase = Phase::kTombstoneSweeper;
ABSL_FALLTHROUGH_INTENDED;
case Phase::kTombstoneSweeper:
tombstone_sweeper_run_complete = RunTombstoneSweeper();
running_state_->tombstone_sweeper_duration +=
base::TimeTicks::Now() - time_before_round;
// If not `tombstone_sweeper_run_complete`, we stay in this
// `kTombstoneSweeper` phase and schedule another round of tombstone
// sweeper. If done, we reset the timer and move to db compaction.
if (tombstone_sweeper_run_complete) {
base::UmaHistogramTimes(
"IndexedDB.LevelDBCleanupScheduler.TombstoneSweeperDuration",
running_state_->tombstone_sweeper_duration);
running_state_->cleanup_phase = Phase::kDatabaseCompaction;
}
ScheduleNextCleanupTask(kDeferTimeOnNoTransactions);
break;
case Phase::kDatabaseCompaction:
IndexedDBCompactionTask(database_).RunRound();
running_state_->db_compaction_duration =
base::TimeTicks::Now() - time_before_round;
base::UmaHistogramTimes(
"IndexedDB.LevelDBCleanupScheduler.DBCompactionDuration",
running_state_->db_compaction_duration);
running_state_->cleanup_phase = Phase::kLoggingAndCleanup;
ScheduleNextCleanupTask(kDeferTimeOnNoTransactions);
break;
case Phase::kLoggingAndCleanup:
LogAndResetState();
break;
}
}
void LevelDBCleanupScheduler::LogAndResetState() {
CHECK(running_state_);
base::UmaHistogramCounts10000(
"IndexedDB.LevelDBCleanupScheduler.CleanerPostponedCount",
running_state_->postpone_count);
// Reset the cleanup state
last_run_ = base::TimeTicks::Now();
running_state_.reset();
// Update the timers for traditional sweeper.
delegate_->UpdateEarliestSweepTime();
delegate_->UpdateEarliestCompactionTime();
}
bool LevelDBCleanupScheduler::RunTombstoneSweeper() {
CHECK(running_state_);
if (!running_state_->tombstone_sweeper) {
delegate_->GetCompleteMetadata(&running_state_->metadata_vector);
running_state_->tombstone_sweeper =
std::make_unique<LevelDbTombstoneSweeper>(database_);
running_state_->tombstone_sweeper->SetMetadata(
&running_state_->metadata_vector);
}
return running_state_->tombstone_sweeper->RunRound();
}
LevelDBCleanupScheduler::RunningState::RunningState() = default;
LevelDBCleanupScheduler::RunningState::~RunningState() = default;
} // namespace content::indexed_db::level_db
|
