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// Copyright 2019 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 procfs
import (
"bufio"
"bytes"
"fmt"
"io"
"strconv"
"strings"
"github.com/prometheus/procfs/internal/util"
)
// Fscacheinfo represents fscache statistics.
type Fscacheinfo struct {
// Number of index cookies allocated
IndexCookiesAllocated uint64
// data storage cookies allocated
DataStorageCookiesAllocated uint64
// Number of special cookies allocated
SpecialCookiesAllocated uint64
// Number of objects allocated
ObjectsAllocated uint64
// Number of object allocation failures
ObjectAllocationsFailure uint64
// Number of objects that reached the available state
ObjectsAvailable uint64
// Number of objects that reached the dead state
ObjectsDead uint64
// Number of objects that didn't have a coherency check
ObjectsWithoutCoherencyCheck uint64
// Number of objects that passed a coherency check
ObjectsWithCoherencyCheck uint64
// Number of objects that needed a coherency data update
ObjectsNeedCoherencyCheckUpdate uint64
// Number of objects that were declared obsolete
ObjectsDeclaredObsolete uint64
// Number of pages marked as being cached
PagesMarkedAsBeingCached uint64
// Number of uncache page requests seen
UncachePagesRequestSeen uint64
// Number of acquire cookie requests seen
AcquireCookiesRequestSeen uint64
// Number of acq reqs given a NULL parent
AcquireRequestsWithNullParent uint64
// Number of acq reqs rejected due to no cache available
AcquireRequestsRejectedNoCacheAvailable uint64
// Number of acq reqs succeeded
AcquireRequestsSucceeded uint64
// Number of acq reqs rejected due to error
AcquireRequestsRejectedDueToError uint64
// Number of acq reqs failed on ENOMEM
AcquireRequestsFailedDueToEnomem uint64
// Number of lookup calls made on cache backends
LookupsNumber uint64
// Number of negative lookups made
LookupsNegative uint64
// Number of positive lookups made
LookupsPositive uint64
// Number of objects created by lookup
ObjectsCreatedByLookup uint64
// Number of lookups timed out and requeued
LookupsTimedOutAndRequed uint64
InvalidationsNumber uint64
InvalidationsRunning uint64
// Number of update cookie requests seen
UpdateCookieRequestSeen uint64
// Number of upd reqs given a NULL parent
UpdateRequestsWithNullParent uint64
// Number of upd reqs granted CPU time
UpdateRequestsRunning uint64
// Number of relinquish cookie requests seen
RelinquishCookiesRequestSeen uint64
// Number of rlq reqs given a NULL parent
RelinquishCookiesWithNullParent uint64
// Number of rlq reqs waited on completion of creation
RelinquishRequestsWaitingCompleteCreation uint64
// Relinqs rtr
RelinquishRetries uint64
// Number of attribute changed requests seen
AttributeChangedRequestsSeen uint64
// Number of attr changed requests queued
AttributeChangedRequestsQueued uint64
// Number of attr changed rejected -ENOBUFS
AttributeChangedRejectDueToEnobufs uint64
// Number of attr changed failed -ENOMEM
AttributeChangedFailedDueToEnomem uint64
// Number of attr changed ops given CPU time
AttributeChangedOps uint64
// Number of allocation requests seen
AllocationRequestsSeen uint64
// Number of successful alloc reqs
AllocationOkRequests uint64
// Number of alloc reqs that waited on lookup completion
AllocationWaitingOnLookup uint64
// Number of alloc reqs rejected -ENOBUFS
AllocationsRejectedDueToEnobufs uint64
// Number of alloc reqs aborted -ERESTARTSYS
AllocationsAbortedDueToErestartsys uint64
// Number of alloc reqs submitted
AllocationOperationsSubmitted uint64
// Number of alloc reqs waited for CPU time
AllocationsWaitedForCPU uint64
// Number of alloc reqs aborted due to object death
AllocationsAbortedDueToObjectDeath uint64
// Number of retrieval (read) requests seen
RetrievalsReadRequests uint64
// Number of successful retr reqs
RetrievalsOk uint64
// Number of retr reqs that waited on lookup completion
RetrievalsWaitingLookupCompletion uint64
// Number of retr reqs returned -ENODATA
RetrievalsReturnedEnodata uint64
// Number of retr reqs rejected -ENOBUFS
RetrievalsRejectedDueToEnobufs uint64
// Number of retr reqs aborted -ERESTARTSYS
RetrievalsAbortedDueToErestartsys uint64
// Number of retr reqs failed -ENOMEM
RetrievalsFailedDueToEnomem uint64
// Number of retr reqs submitted
RetrievalsRequests uint64
// Number of retr reqs waited for CPU time
RetrievalsWaitingCPU uint64
// Number of retr reqs aborted due to object death
RetrievalsAbortedDueToObjectDeath uint64
// Number of storage (write) requests seen
StoreWriteRequests uint64
// Number of successful store reqs
StoreSuccessfulRequests uint64
// Number of store reqs on a page already pending storage
StoreRequestsOnPendingStorage uint64
// Number of store reqs rejected -ENOBUFS
StoreRequestsRejectedDueToEnobufs uint64
// Number of store reqs failed -ENOMEM
StoreRequestsFailedDueToEnomem uint64
// Number of store reqs submitted
StoreRequestsSubmitted uint64
// Number of store reqs granted CPU time
StoreRequestsRunning uint64
// Number of pages given store req processing time
StorePagesWithRequestsProcessing uint64
// Number of store reqs deleted from tracking tree
StoreRequestsDeleted uint64
// Number of store reqs over store limit
StoreRequestsOverStoreLimit uint64
// Number of release reqs against pages with no pending store
ReleaseRequestsAgainstPagesWithNoPendingStorage uint64
// Number of release reqs against pages stored by time lock granted
ReleaseRequestsAgainstPagesStoredByTimeLockGranted uint64
// Number of release reqs ignored due to in-progress store
ReleaseRequestsIgnoredDueToInProgressStore uint64
// Number of page stores cancelled due to release req
PageStoresCancelledByReleaseRequests uint64
VmscanWaiting uint64
// Number of times async ops added to pending queues
OpsPending uint64
// Number of times async ops given CPU time
OpsRunning uint64
// Number of times async ops queued for processing
OpsEnqueued uint64
// Number of async ops cancelled
OpsCancelled uint64
// Number of async ops rejected due to object lookup/create failure
OpsRejected uint64
// Number of async ops initialised
OpsInitialised uint64
// Number of async ops queued for deferred release
OpsDeferred uint64
// Number of async ops released (should equal ini=N when idle)
OpsReleased uint64
// Number of deferred-release async ops garbage collected
OpsGarbageCollected uint64
// Number of in-progress alloc_object() cache ops
CacheopAllocationsinProgress uint64
// Number of in-progress lookup_object() cache ops
CacheopLookupObjectInProgress uint64
// Number of in-progress lookup_complete() cache ops
CacheopLookupCompleteInPorgress uint64
// Number of in-progress grab_object() cache ops
CacheopGrabObjectInProgress uint64
CacheopInvalidations uint64
// Number of in-progress update_object() cache ops
CacheopUpdateObjectInProgress uint64
// Number of in-progress drop_object() cache ops
CacheopDropObjectInProgress uint64
// Number of in-progress put_object() cache ops
CacheopPutObjectInProgress uint64
// Number of in-progress attr_changed() cache ops
CacheopAttributeChangeInProgress uint64
// Number of in-progress sync_cache() cache ops
CacheopSyncCacheInProgress uint64
// Number of in-progress read_or_alloc_page() cache ops
CacheopReadOrAllocPageInProgress uint64
// Number of in-progress read_or_alloc_pages() cache ops
CacheopReadOrAllocPagesInProgress uint64
// Number of in-progress allocate_page() cache ops
CacheopAllocatePageInProgress uint64
// Number of in-progress allocate_pages() cache ops
CacheopAllocatePagesInProgress uint64
// Number of in-progress write_page() cache ops
CacheopWritePagesInProgress uint64
// Number of in-progress uncache_page() cache ops
CacheopUncachePagesInProgress uint64
// Number of in-progress dissociate_pages() cache ops
CacheopDissociatePagesInProgress uint64
// Number of object lookups/creations rejected due to lack of space
CacheevLookupsAndCreationsRejectedLackSpace uint64
// Number of stale objects deleted
CacheevStaleObjectsDeleted uint64
// Number of objects retired when relinquished
CacheevRetiredWhenReliquished uint64
// Number of objects culled
CacheevObjectsCulled uint64
}
// Fscacheinfo returns information about current fscache statistics.
// See https://www.kernel.org/doc/Documentation/filesystems/caching/fscache.txt
func (fs FS) Fscacheinfo() (Fscacheinfo, error) {
b, err := util.ReadFileNoStat(fs.proc.Path("fs/fscache/stats"))
if err != nil {
return Fscacheinfo{}, err
}
m, err := parseFscacheinfo(bytes.NewReader(b))
if err != nil {
return Fscacheinfo{}, fmt.Errorf("%s: Cannot parse %v: %w", ErrFileParse, m, err)
}
return *m, nil
}
func setFSCacheFields(fields []string, setFields ...*uint64) error {
var err error
if len(fields) < len(setFields) {
return fmt.Errorf("%s: Expected %d, but got %d: %w", ErrFileParse, len(setFields), len(fields), err)
}
for i := range setFields {
*setFields[i], err = strconv.ParseUint(strings.Split(fields[i], "=")[1], 0, 64)
if err != nil {
return err
}
}
return nil
}
func parseFscacheinfo(r io.Reader) (*Fscacheinfo, error) {
var m Fscacheinfo
s := bufio.NewScanner(r)
for s.Scan() {
fields := strings.Fields(s.Text())
if len(fields) < 2 {
return nil, fmt.Errorf("%w: malformed Fscacheinfo line: %q", ErrFileParse, s.Text())
}
switch fields[0] {
case "Cookies:":
err := setFSCacheFields(fields[1:], &m.IndexCookiesAllocated, &m.DataStorageCookiesAllocated,
&m.SpecialCookiesAllocated)
if err != nil {
return &m, err
}
case "Objects:":
err := setFSCacheFields(fields[1:], &m.ObjectsAllocated, &m.ObjectAllocationsFailure,
&m.ObjectsAvailable, &m.ObjectsDead)
if err != nil {
return &m, err
}
case "ChkAux":
err := setFSCacheFields(fields[2:], &m.ObjectsWithoutCoherencyCheck, &m.ObjectsWithCoherencyCheck,
&m.ObjectsNeedCoherencyCheckUpdate, &m.ObjectsDeclaredObsolete)
if err != nil {
return &m, err
}
case "Pages":
err := setFSCacheFields(fields[2:], &m.PagesMarkedAsBeingCached, &m.UncachePagesRequestSeen)
if err != nil {
return &m, err
}
case "Acquire:":
err := setFSCacheFields(fields[1:], &m.AcquireCookiesRequestSeen, &m.AcquireRequestsWithNullParent,
&m.AcquireRequestsRejectedNoCacheAvailable, &m.AcquireRequestsSucceeded, &m.AcquireRequestsRejectedDueToError,
&m.AcquireRequestsFailedDueToEnomem)
if err != nil {
return &m, err
}
case "Lookups:":
err := setFSCacheFields(fields[1:], &m.LookupsNumber, &m.LookupsNegative, &m.LookupsPositive,
&m.ObjectsCreatedByLookup, &m.LookupsTimedOutAndRequed)
if err != nil {
return &m, err
}
case "Invals":
err := setFSCacheFields(fields[2:], &m.InvalidationsNumber, &m.InvalidationsRunning)
if err != nil {
return &m, err
}
case "Updates:":
err := setFSCacheFields(fields[1:], &m.UpdateCookieRequestSeen, &m.UpdateRequestsWithNullParent,
&m.UpdateRequestsRunning)
if err != nil {
return &m, err
}
case "Relinqs:":
err := setFSCacheFields(fields[1:], &m.RelinquishCookiesRequestSeen, &m.RelinquishCookiesWithNullParent,
&m.RelinquishRequestsWaitingCompleteCreation, &m.RelinquishRetries)
if err != nil {
return &m, err
}
case "AttrChg:":
err := setFSCacheFields(fields[1:], &m.AttributeChangedRequestsSeen, &m.AttributeChangedRequestsQueued,
&m.AttributeChangedRejectDueToEnobufs, &m.AttributeChangedFailedDueToEnomem, &m.AttributeChangedOps)
if err != nil {
return &m, err
}
case "Allocs":
if strings.Split(fields[2], "=")[0] == "n" {
err := setFSCacheFields(fields[2:], &m.AllocationRequestsSeen, &m.AllocationOkRequests,
&m.AllocationWaitingOnLookup, &m.AllocationsRejectedDueToEnobufs, &m.AllocationsAbortedDueToErestartsys)
if err != nil {
return &m, err
}
} else {
err := setFSCacheFields(fields[2:], &m.AllocationOperationsSubmitted, &m.AllocationsWaitedForCPU,
&m.AllocationsAbortedDueToObjectDeath)
if err != nil {
return &m, err
}
}
case "Retrvls:":
if strings.Split(fields[1], "=")[0] == "n" {
err := setFSCacheFields(fields[1:], &m.RetrievalsReadRequests, &m.RetrievalsOk, &m.RetrievalsWaitingLookupCompletion,
&m.RetrievalsReturnedEnodata, &m.RetrievalsRejectedDueToEnobufs, &m.RetrievalsAbortedDueToErestartsys,
&m.RetrievalsFailedDueToEnomem)
if err != nil {
return &m, err
}
} else {
err := setFSCacheFields(fields[1:], &m.RetrievalsRequests, &m.RetrievalsWaitingCPU, &m.RetrievalsAbortedDueToObjectDeath)
if err != nil {
return &m, err
}
}
case "Stores":
if strings.Split(fields[2], "=")[0] == "n" {
err := setFSCacheFields(fields[2:], &m.StoreWriteRequests, &m.StoreSuccessfulRequests,
&m.StoreRequestsOnPendingStorage, &m.StoreRequestsRejectedDueToEnobufs, &m.StoreRequestsFailedDueToEnomem)
if err != nil {
return &m, err
}
} else {
err := setFSCacheFields(fields[2:], &m.StoreRequestsSubmitted, &m.StoreRequestsRunning,
&m.StorePagesWithRequestsProcessing, &m.StoreRequestsDeleted, &m.StoreRequestsOverStoreLimit)
if err != nil {
return &m, err
}
}
case "VmScan":
err := setFSCacheFields(fields[2:], &m.ReleaseRequestsAgainstPagesWithNoPendingStorage,
&m.ReleaseRequestsAgainstPagesStoredByTimeLockGranted, &m.ReleaseRequestsIgnoredDueToInProgressStore,
&m.PageStoresCancelledByReleaseRequests, &m.VmscanWaiting)
if err != nil {
return &m, err
}
case "Ops":
if strings.Split(fields[2], "=")[0] == "pend" {
err := setFSCacheFields(fields[2:], &m.OpsPending, &m.OpsRunning, &m.OpsEnqueued, &m.OpsCancelled, &m.OpsRejected)
if err != nil {
return &m, err
}
} else {
err := setFSCacheFields(fields[2:], &m.OpsInitialised, &m.OpsDeferred, &m.OpsReleased, &m.OpsGarbageCollected)
if err != nil {
return &m, err
}
}
case "CacheOp:":
if strings.Split(fields[1], "=")[0] == "alo" {
err := setFSCacheFields(fields[1:], &m.CacheopAllocationsinProgress, &m.CacheopLookupObjectInProgress,
&m.CacheopLookupCompleteInPorgress, &m.CacheopGrabObjectInProgress)
if err != nil {
return &m, err
}
} else if strings.Split(fields[1], "=")[0] == "inv" {
err := setFSCacheFields(fields[1:], &m.CacheopInvalidations, &m.CacheopUpdateObjectInProgress,
&m.CacheopDropObjectInProgress, &m.CacheopPutObjectInProgress, &m.CacheopAttributeChangeInProgress,
&m.CacheopSyncCacheInProgress)
if err != nil {
return &m, err
}
} else {
err := setFSCacheFields(fields[1:], &m.CacheopReadOrAllocPageInProgress, &m.CacheopReadOrAllocPagesInProgress,
&m.CacheopAllocatePageInProgress, &m.CacheopAllocatePagesInProgress, &m.CacheopWritePagesInProgress,
&m.CacheopUncachePagesInProgress, &m.CacheopDissociatePagesInProgress)
if err != nil {
return &m, err
}
}
case "CacheEv:":
err := setFSCacheFields(fields[1:], &m.CacheevLookupsAndCreationsRejectedLackSpace, &m.CacheevStaleObjectsDeleted,
&m.CacheevRetiredWhenReliquished, &m.CacheevObjectsCulled)
if err != nil {
return &m, err
}
}
}
return &m, nil
}