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// Copyright 2017 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package bcache provides access to statistics exposed by the bcache (Linux
// block cache).
package bcache
// Stats contains bcache runtime statistics, parsed from /sys/fs/bcache/.
//
// The names and meanings of each statistic were taken from bcache.txt and
// files in drivers/md/bcache in the Linux kernel source. Counters are uint64
// (in-kernel counters are mostly unsigned long).
type Stats struct {
// The name of the bcache used to source these statistics.
Name string
Bcache BcacheStats
Bdevs []BdevStats
Caches []CacheStats
}
// BcacheStats contains statistics tied to a bcache ID.
type BcacheStats struct { // nolint:revive
AverageKeySize uint64
BtreeCacheSize uint64
CacheAvailablePercent uint64
Congested uint64
RootUsagePercent uint64
TreeDepth uint64
Internal InternalStats
FiveMin PeriodStats
Total PeriodStats
}
// BdevStats contains statistics for one backing device.
type BdevStats struct {
Name string
DirtyData uint64
FiveMin PeriodStats
Total PeriodStats
WritebackRateDebug WritebackRateDebugStats
}
// CacheStats contains statistics for one cache device.
type CacheStats struct {
Name string
IOErrors uint64
MetadataWritten uint64
Written uint64
Priority PriorityStats
}
// PriorityStats contains statistics from the priority_stats file.
type PriorityStats struct {
UnusedPercent uint64
MetadataPercent uint64
}
// InternalStats contains internal bcache statistics.
type InternalStats struct {
ActiveJournalEntries uint64
BtreeNodes uint64
BtreeReadAverageDurationNanoSeconds uint64
CacheReadRaces uint64
}
// PeriodStats contains statistics for a time period (5 min or total).
type PeriodStats struct {
Bypassed uint64
CacheBypassHits uint64
CacheBypassMisses uint64
CacheHits uint64
CacheMissCollisions uint64
CacheMisses uint64
CacheReadaheads uint64
}
// WritebackRateDebugStats contains bcache writeback statistics.
type WritebackRateDebugStats struct {
Rate uint64
Dirty uint64
Target uint64
Proportional int64
Integral int64
Change int64
NextIO int64
}