blob: 689db4ddd946b03defdedd06eaa45504b9e54613 [file] [log] [blame]
// Copyright (c) 2011 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.
#include "webkit/quota/quota_temporary_storage_evictor.h"
#include <algorithm>
#include "base/bind.h"
#include "base/metrics/histogram.h"
#include "googleurl/src/gurl.h"
#include "webkit/quota/quota_manager.h"
#define UMA_HISTOGRAM_MBYTES(name, sample) \
UMA_HISTOGRAM_CUSTOM_COUNTS( \
(name), static_cast<int>((sample) / kMBytes), \
1, 10 * 1024 * 1024 /* 10TB */, 100)
#define UMA_HISTOGRAM_MINUTES(name, sample) \
UMA_HISTOGRAM_CUSTOM_TIMES( \
(name), (sample), \
base::TimeDelta::FromMinutes(1), \
base::TimeDelta::FromDays(1), 50)
namespace {
const int64 kMBytes = 1024 * 1024;
const double kUsageRatioToStartEviction = 0.7;
const int kThresholdOfErrorsToStopEviction = 5;
const int kHistogramReportIntervalMinutes = 60;
}
namespace quota {
const int QuotaTemporaryStorageEvictor::
kMinAvailableDiskSpaceToStartEvictionNotSpecified = -1;
QuotaTemporaryStorageEvictor::QuotaTemporaryStorageEvictor(
QuotaEvictionHandler* quota_eviction_handler,
int64 interval_ms)
: min_available_disk_space_to_start_eviction_(
kMinAvailableDiskSpaceToStartEvictionNotSpecified),
quota_eviction_handler_(quota_eviction_handler),
interval_ms_(interval_ms),
repeated_eviction_(true),
weak_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
DCHECK(quota_eviction_handler);
}
QuotaTemporaryStorageEvictor::~QuotaTemporaryStorageEvictor() {
}
void QuotaTemporaryStorageEvictor::GetStatistics(
std::map<std::string, int64>* statistics) {
DCHECK(statistics);
(*statistics)["errors-on-evicting-origin"] =
statistics_.num_errors_on_evicting_origin;
(*statistics)["errors-on-getting-usage-and-quota"] =
statistics_.num_errors_on_getting_usage_and_quota;
(*statistics)["evicted-origins"] =
statistics_.num_evicted_origins;
(*statistics)["eviction-rounds"] =
statistics_.num_eviction_rounds;
(*statistics)["skipped-eviction-rounds"] =
statistics_.num_skipped_eviction_rounds;
}
void QuotaTemporaryStorageEvictor::ReportPerRoundHistogram() {
DCHECK(round_statistics_.in_round);
DCHECK(round_statistics_.is_initialized);
base::Time now = base::Time::Now();
UMA_HISTOGRAM_TIMES("Quota.TimeSpentToAEvictionRound",
now - round_statistics_.start_time);
if (!time_of_end_of_last_round_.is_null())
UMA_HISTOGRAM_MINUTES("Quota.TimeDeltaOfEvictionRounds",
now - time_of_end_of_last_round_);
UMA_HISTOGRAM_MBYTES("Quota.UsageOverageOfTemporaryGlobalStorage",
round_statistics_.usage_overage_at_round);
UMA_HISTOGRAM_MBYTES("Quota.DiskspaceShortage",
round_statistics_.diskspace_shortage_at_round);
UMA_HISTOGRAM_MBYTES("Quota.EvictedBytesPerRound",
round_statistics_.usage_on_beginning_of_round -
round_statistics_.usage_on_end_of_round);
UMA_HISTOGRAM_COUNTS("Quota.NumberOfEvictedOriginsPerRound",
round_statistics_.num_evicted_origins_in_round);
}
void QuotaTemporaryStorageEvictor::ReportPerHourHistogram() {
Statistics stats_in_hour(statistics_);
stats_in_hour.subtract_assign(previous_statistics_);
previous_statistics_ = statistics_;
UMA_HISTOGRAM_COUNTS("Quota.ErrorsOnEvictingOriginPerHour",
stats_in_hour.num_errors_on_evicting_origin);
UMA_HISTOGRAM_COUNTS("Quota.ErrorsOnGettingUsageAndQuotaPerHour",
stats_in_hour.num_errors_on_getting_usage_and_quota);
UMA_HISTOGRAM_COUNTS("Quota.EvictedOriginsPerHour",
stats_in_hour.num_evicted_origins);
UMA_HISTOGRAM_COUNTS("Quota.EvictionRoundsPerHour",
stats_in_hour.num_eviction_rounds);
UMA_HISTOGRAM_COUNTS("Quota.SkippedEvictionRoundsPerHour",
stats_in_hour.num_skipped_eviction_rounds);
}
void QuotaTemporaryStorageEvictor::OnEvictionRoundStarted() {
if (round_statistics_.in_round)
return;
round_statistics_.in_round = true;
round_statistics_.start_time = base::Time::Now();
++statistics_.num_eviction_rounds;
}
void QuotaTemporaryStorageEvictor::OnEvictionRoundFinished() {
// Check if skipped round
if (round_statistics_.num_evicted_origins_in_round) {
ReportPerRoundHistogram();
time_of_end_of_last_nonskipped_round_ = base::Time::Now();
} else {
++statistics_.num_skipped_eviction_rounds;
}
// Reset stats for next round.
round_statistics_ = EvictionRoundStatistics();
}
void QuotaTemporaryStorageEvictor::Start() {
DCHECK(CalledOnValidThread());
StartEvictionTimerWithDelay(0);
if (histogram_timer_.IsRunning())
return;
histogram_timer_.Start(
FROM_HERE, base::TimeDelta::FromMinutes(kHistogramReportIntervalMinutes),
this, &QuotaTemporaryStorageEvictor::ReportPerHourHistogram);
}
void QuotaTemporaryStorageEvictor::StartEvictionTimerWithDelay(int delay_ms) {
if (eviction_timer_.IsRunning())
return;
eviction_timer_.Start(FROM_HERE, base::TimeDelta::FromMilliseconds(delay_ms),
this, &QuotaTemporaryStorageEvictor::ConsiderEviction);
}
void QuotaTemporaryStorageEvictor::ConsiderEviction() {
OnEvictionRoundStarted();
// Get usage and disk space, then continue.
quota_eviction_handler_->GetUsageAndQuotaForEviction(
base::Bind(&QuotaTemporaryStorageEvictor::OnGotUsageAndQuotaForEviction,
weak_factory_.GetWeakPtr()));
}
void QuotaTemporaryStorageEvictor::OnGotUsageAndQuotaForEviction(
QuotaStatusCode status,
const QuotaAndUsage& qau) {
DCHECK(CalledOnValidThread());
// unlimited_usage is a subset of usage
DCHECK_GE(qau.usage, qau.unlimited_usage);
int64 usage = qau.usage - qau.unlimited_usage;
if (status != kQuotaStatusOk)
++statistics_.num_errors_on_getting_usage_and_quota;
int64 usage_overage = std::max(
static_cast<int64>(0),
usage - static_cast<int64>(qau.quota * kUsageRatioToStartEviction));
// min_available_disk_space_to_start_eviction_ might be < 0 if no value
// is explicitly configured yet.
int64 diskspace_shortage = std::max(
static_cast<int64>(0),
min_available_disk_space_to_start_eviction_ - qau.available_disk_space);
if (!round_statistics_.is_initialized) {
round_statistics_.usage_overage_at_round = usage_overage;
round_statistics_.diskspace_shortage_at_round = diskspace_shortage;
round_statistics_.usage_on_beginning_of_round = usage;
round_statistics_.is_initialized = true;
}
round_statistics_.usage_on_end_of_round = usage;
int64 amount_to_evict = std::max(usage_overage, diskspace_shortage);
if (status == kQuotaStatusOk && amount_to_evict > 0) {
// Space is getting tight. Get the least recently used origin and continue.
// TODO(michaeln): if the reason for eviction is low physical disk space,
// make 'unlimited' origins subject to eviction too.
quota_eviction_handler_->GetLRUOrigin(
kStorageTypeTemporary,
base::Bind(&QuotaTemporaryStorageEvictor::OnGotLRUOrigin,
weak_factory_.GetWeakPtr()));
} else {
if (repeated_eviction_) {
// No action required, sleep for a while and check again later.
if (statistics_.num_errors_on_getting_usage_and_quota <
kThresholdOfErrorsToStopEviction) {
StartEvictionTimerWithDelay(interval_ms_);
} else {
// TODO(dmikurube): Try restarting eviction after a while.
LOG(WARNING) << "Stopped eviction of temporary storage due to errors "
"in GetUsageAndQuotaForEviction.";
}
}
OnEvictionRoundFinished();
}
// TODO(dmikurube): Add error handling for the case status != kQuotaStatusOk.
}
void QuotaTemporaryStorageEvictor::OnGotLRUOrigin(const GURL& origin) {
DCHECK(CalledOnValidThread());
if (origin.is_empty()) {
if (repeated_eviction_)
StartEvictionTimerWithDelay(interval_ms_);
OnEvictionRoundFinished();
return;
}
quota_eviction_handler_->EvictOriginData(origin, kStorageTypeTemporary,
base::Bind(
&QuotaTemporaryStorageEvictor::OnEvictionComplete,
weak_factory_.GetWeakPtr()));
}
void QuotaTemporaryStorageEvictor::OnEvictionComplete(
QuotaStatusCode status) {
DCHECK(CalledOnValidThread());
// Just calling ConsiderEviction() or StartEvictionTimerWithDelay() here is
// ok. No need to deal with the case that all of the Delete operations fail
// for a certain origin. It doesn't result in trying to evict the same
// origin permanently. The evictor skips origins which had deletion errors
// a few times.
if (status == kQuotaStatusOk) {
++statistics_.num_evicted_origins;
++round_statistics_.num_evicted_origins_in_round;
// We many need to get rid of more space so reconsider immediately.
ConsiderEviction();
} else {
++statistics_.num_errors_on_evicting_origin;
if (repeated_eviction_) {
// Sleep for a while and retry again until we see too many errors.
StartEvictionTimerWithDelay(interval_ms_);
}
OnEvictionRoundFinished();
}
}
} // namespace quota