mirror of
https://github.com/ethereum/go-ethereum.git
synced 2026-06-19 13:21:37 +00:00
internal/memlimit: respect cgroup memory cap (#34947)
Currently geth ignores the docker `--memory` directive and doesn't adjust its cache size downward when necessary, potentially running into OOM. while gopsutil has functions like `docker/CgroupMem()` they are rather for reading cgroup memory limit of a container from the host.
This commit is contained in:
Sina M
GitHub
parent
906727089b
commit
d93dda49c8
6 changed files with 452 additions and 11 deletions
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@ -58,6 +58,7 @@ import (
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"github.com/ethereum/go-ethereum/graphql"
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"github.com/ethereum/go-ethereum/internal/ethapi"
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"github.com/ethereum/go-ethereum/internal/flags"
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"github.com/ethereum/go-ethereum/internal/memlimit"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/metrics"
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"github.com/ethereum/go-ethereum/metrics/exp"
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@ -74,7 +75,6 @@ import (
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"github.com/ethereum/go-ethereum/triedb/hashdb"
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"github.com/ethereum/go-ethereum/triedb/pathdb"
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pcsclite "github.com/gballet/go-libpcsclite"
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gopsutil "github.com/shirou/gopsutil/mem"
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"github.com/urfave/cli/v2"
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)
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@ -1726,16 +1726,18 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
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setMiner(ctx, &cfg.Miner)
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setRequiredBlocks(ctx, cfg)
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// Cap the cache allowance and tune the garbage collector
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mem, err := gopsutil.VirtualMemory()
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if err == nil {
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if 32<<(^uintptr(0)>>63) == 32 && mem.Total > 2*1024*1024*1024 {
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log.Warn("Lowering memory allowance on 32bit arch", "available", mem.Total/1024/1024, "addressable", 2*1024)
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mem.Total = 2 * 1024 * 1024 * 1024
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// Cap the cache allowance and tune the garbage collector against
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// the effective memory limit (cgroup-imposed when running in a
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// container, total system memory otherwise).
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total, source := memlimit.Limit()
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if total > 0 {
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if 32<<(^uintptr(0)>>63) == 32 && total > 2*1024*1024*1024 {
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log.Warn("Lowering memory allowance on 32bit arch", "available", total/1024/1024, "addressable", 2*1024)
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total = 2 * 1024 * 1024 * 1024
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}
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allowance := int(mem.Total / 1024 / 1024 / 3)
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allowance := int(total / 1024 / 1024 / 3)
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if cache := ctx.Int(CacheFlag.Name); cache > allowance {
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log.Warn("Sanitizing cache to Go's GC limits", "provided", cache, "updated", allowance)
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log.Warn("Sanitizing cache to Go's GC limits", "source", source, "provided", cache, "updated", allowance)
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ctx.Set(CacheFlag.Name, strconv.Itoa(allowance))
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}
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}
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@ -1750,14 +1752,14 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
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cfg.SyncMode = ethconfig.FullSync // dev sync target forces full sync
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} else if ctx.IsSet(SyncModeFlag.Name) {
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value := ctx.String(SyncModeFlag.Name)
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if err = cfg.SyncMode.UnmarshalText([]byte(value)); err != nil {
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if err := cfg.SyncMode.UnmarshalText([]byte(value)); err != nil {
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Fatalf("--%v: %v", SyncModeFlag.Name, err)
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}
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}
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if ctx.IsSet(ChainHistoryFlag.Name) {
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value := ctx.String(ChainHistoryFlag.Name)
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if err = cfg.HistoryMode.UnmarshalText([]byte(value)); err != nil {
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if err := cfg.HistoryMode.UnmarshalText([]byte(value)); err != nil {
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Fatalf("--%s: %v", ChainHistoryFlag.Name, err)
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}
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}
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59
internal/memlimit/probe.go
Normal file
59
internal/memlimit/probe.go
Normal file
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@ -0,0 +1,59 @@
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// Copyright 2026 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package memlimit detects the effective memory limit of the current
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// process. On Linux the cgroup limit is consulted first, with total
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// system memory as the fallback on all platforms.
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package memlimit
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import (
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gopsutil "github.com/shirou/gopsutil/mem"
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)
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// Source identifies which mechanism produced the limit value.
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type Source int
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const (
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SourceUnknown Source = iota
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SourceCgroupV2
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SourceCgroupV1
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SourceSystem
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)
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func (s Source) String() string {
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switch s {
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case SourceCgroupV2:
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return "cgroup-v2"
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case SourceCgroupV1:
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return "cgroup-v1"
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case SourceSystem:
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return "system"
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default:
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return "unknown"
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}
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}
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// Limit returns the memory limit visible to this process in bytes and
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// the source that produced it.
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func Limit() (bytes uint64, source Source) {
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if v, src, ok := platformLimit(); ok {
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return v, src
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}
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if mem, err := gopsutil.VirtualMemory(); err == nil {
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return mem.Total, SourceSystem
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}
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return 0, SourceUnknown
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}
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155
internal/memlimit/probe_linux.go
Normal file
155
internal/memlimit/probe_linux.go
Normal file
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@ -0,0 +1,155 @@
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// Copyright 2026 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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//go:build linux
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package memlimit
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import (
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"os"
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"path"
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"strconv"
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"strings"
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)
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// cgroupV1UnlimitedThreshold detects the v1 "no limit" sentinel, which
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// is LONG_MAX rounded down to the kernel page size. Anything above 1<<62
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// is treated as unlimited regardless of page size.
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const cgroupV1UnlimitedThreshold = uint64(1) << 62
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// fileReader abstracts os.ReadFile for testing.
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type fileReader func(path string) ([]byte, error)
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// platformLimit returns the cgroup limit (v2 memory.max or v1
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// memory.limit_in_bytes) of the current process. The cgroup limit is
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// the authoritative budget in a container, where /proc/meminfo
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// reports the host's RAM.
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func platformLimit() (uint64, Source, bool) {
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if v, ok := cgroupV2Limit(os.ReadFile); ok {
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return v, SourceCgroupV2, true
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}
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if v, ok := cgroupV1Limit(os.ReadFile); ok {
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return v, SourceCgroupV1, true
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}
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return 0, SourceUnknown, false
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}
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// cgroupV2Limit reads the cgroup v2 memory.max for the current process.
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// It probes /sys/fs/cgroup directly first (the effective root inside a
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// cgroup-namespaced container), then the path from /proc/self/cgroup
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// for the bare-metal case where the limit sits on a systemd slice.
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func cgroupV2Limit(read fileReader) (uint64, bool) {
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if v, ok := readCgroupV2At("/sys/fs/cgroup", "/", read); ok {
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return v, true
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}
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procPath, ok := readProcSelfCgroupV2(read)
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if !ok || procPath == "/" {
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return 0, false
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}
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return readCgroupV2At("/sys/fs/cgroup", procPath, read)
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}
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// readCgroupV2At reads memory.max under root+rel, walking up parents
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// until a numeric value is found or the path bottoms out.
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func readCgroupV2At(root, rel string, read fileReader) (uint64, bool) {
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// cgroup.controllers exists only on v2; if absent, v2 is not mounted here.
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if _, err := read(path.Join(root, "cgroup.controllers")); err != nil {
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return 0, false
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}
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for {
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raw, err := read(path.Join(root, rel, "memory.max"))
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if err == nil {
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s := strings.TrimSpace(string(raw))
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if s != "max" {
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// Zero is legal to write but degenerate; treat it like
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// "max" and keep walking up.
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if n, err := strconv.ParseUint(s, 10, 64); err == nil && n != 0 {
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return n, true
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}
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}
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}
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if rel == "/" || rel == "" {
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return 0, false
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}
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rel = path.Dir(rel)
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}
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}
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// readProcSelfCgroupV2 returns the cgroup path from the v2 line
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// ("0::<path>") of /proc/self/cgroup.
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func readProcSelfCgroupV2(read fileReader) (string, bool) {
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raw, err := read("/proc/self/cgroup")
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if err != nil {
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return "", false
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}
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for line := range strings.SplitSeq(strings.TrimSpace(string(raw)), "\n") {
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// v2 unified line: "0::<path>"
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if strings.HasPrefix(line, "0::") {
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return strings.TrimPrefix(line, "0::"), true
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}
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}
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return "", false
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}
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// cgroupV1Limit reads memory.limit_in_bytes from the v1 memory
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// controller, walking up parents when a node reports the unlimited
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// sentinel.
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func cgroupV1Limit(read fileReader) (uint64, bool) {
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rel, ok := readProcSelfCgroupV1Memory(read)
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if !ok {
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return 0, false
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}
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root := "/sys/fs/cgroup/memory"
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if _, err := read(path.Join(root, "memory.limit_in_bytes")); err != nil {
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return 0, false
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}
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for {
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raw, err := read(path.Join(root, rel, "memory.limit_in_bytes"))
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if err == nil {
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if n, err := strconv.ParseUint(strings.TrimSpace(string(raw)), 10, 64); err == nil {
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if n != 0 && n < cgroupV1UnlimitedThreshold {
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return n, true
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}
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}
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}
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if rel == "/" || rel == "" {
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return 0, false
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}
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rel = path.Dir(rel)
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}
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}
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// readProcSelfCgroupV1Memory parses /proc/self/cgroup for the v1 memory
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// controller line ("<id>:memory:<path>" or "<id>:...,memory,...:<path>").
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func readProcSelfCgroupV1Memory(read fileReader) (string, bool) {
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raw, err := read("/proc/self/cgroup")
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if err != nil {
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return "", false
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}
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for line := range strings.SplitSeq(strings.TrimSpace(string(raw)), "\n") {
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// Format: "<hierarchy-id>:<comma-separated-controllers>:<path>"
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parts := strings.SplitN(line, ":", 3)
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if len(parts) != 3 {
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continue
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}
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for ctrl := range strings.SplitSeq(parts[1], ",") {
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if ctrl == "memory" {
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return parts[2], true
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}
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}
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}
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return "", false
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}
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172
internal/memlimit/probe_linux_test.go
Normal file
172
internal/memlimit/probe_linux_test.go
Normal file
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@ -0,0 +1,172 @@
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// Copyright 2026 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
|
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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//go:build linux
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package memlimit
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import (
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"os"
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"testing"
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)
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// fakeFS is a fileReader backed by an in-memory map. Missing keys
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// return os.ErrNotExist.
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type fakeFS map[string]string
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func (f fakeFS) read(path string) ([]byte, error) {
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v, ok := f[path]
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if !ok {
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return nil, os.ErrNotExist
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}
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return []byte(v), nil
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}
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func TestCgroupV2Container(t *testing.T) {
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// Namespaced container (Docker default since 20.10): memory.max
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// sits directly at the cgroup root.
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fs := fakeFS{
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"/sys/fs/cgroup/cgroup.controllers": "memory cpu io",
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"/sys/fs/cgroup/memory.max": "536870912",
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"/proc/self/cgroup": "0::/",
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}
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bytes, ok := cgroupV2Limit(fs.read)
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if !ok || bytes != 536870912 {
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t.Errorf("got (%d, %v), want (536870912, true)", bytes, ok)
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}
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}
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func TestCgroupV2Unlimited(t *testing.T) {
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fs := fakeFS{
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"/sys/fs/cgroup/cgroup.controllers": "memory cpu io",
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"/sys/fs/cgroup/memory.max": "max",
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"/proc/self/cgroup": "0::/",
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}
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if _, ok := cgroupV2Limit(fs.read); ok {
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t.Errorf("expected ok=false for fully unlimited v2 hierarchy")
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}
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}
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func TestCgroupV2LimitOnAncestor(t *testing.T) {
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// Bare-metal systemd: the leaf has no limit but the containing
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// slice does.
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fs := fakeFS{
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"/sys/fs/cgroup/cgroup.controllers": "memory cpu io",
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"/sys/fs/cgroup/memory.max": "max",
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"/sys/fs/cgroup/system.slice/memory.max": "8589934592",
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"/sys/fs/cgroup/system.slice/geth.service/memory.max": "max",
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"/proc/self/cgroup": "0::/system.slice/geth.service",
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}
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bytes, ok := cgroupV2Limit(fs.read)
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if !ok || bytes != 8589934592 {
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t.Errorf("got (%d, %v), want (8589934592, true)", bytes, ok)
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}
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}
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func TestCgroupV2PrefersDirectRoot(t *testing.T) {
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// In a namespaced container /proc/self/cgroup may show a host-side
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// path; the direct probe at the root must win.
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fs := fakeFS{
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"/sys/fs/cgroup/cgroup.controllers": "memory cpu io",
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"/sys/fs/cgroup/memory.max": "536870912",
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"/sys/fs/cgroup/system.slice/memory.max": "max",
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"/proc/self/cgroup": "0::/system.slice/docker-abc.scope",
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}
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bytes, ok := cgroupV2Limit(fs.read)
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if !ok || bytes != 536870912 {
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t.Errorf("got (%d, ok=%v), want (536870912, true)", bytes, ok)
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}
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}
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func TestCgroupV2ZeroWalksUp(t *testing.T) {
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// memory.max="0" is legal but degenerate; walk up like "max".
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fs := fakeFS{
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"/sys/fs/cgroup/cgroup.controllers": "memory cpu io",
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"/sys/fs/cgroup/memory.max": "max",
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"/sys/fs/cgroup/system.slice/memory.max": "536870912",
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"/sys/fs/cgroup/system.slice/geth.service/memory.max": "0",
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"/proc/self/cgroup": "0::/system.slice/geth.service",
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}
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bytes, ok := cgroupV2Limit(fs.read)
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if !ok || bytes != 536870912 {
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t.Errorf("got (%d, ok=%v), want (536870912, true)", bytes, ok)
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}
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}
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func TestCgroupV1(t *testing.T) {
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fs := fakeFS{
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// no v2 hallmark file
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"/sys/fs/cgroup/memory/memory.limit_in_bytes": "9223372036854771712",
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"/sys/fs/cgroup/memory/docker/abc/memory.limit_in_bytes": "1073741824",
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"/proc/self/cgroup": "12:memory:/docker/abc\n11:cpu:/docker/abc",
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}
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if _, ok := cgroupV2Limit(fs.read); ok {
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t.Errorf("expected v2 probe to fail on a v1-only host")
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}
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bytes, ok := cgroupV1Limit(fs.read)
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if !ok || bytes != 1073741824 {
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t.Errorf("got (%d, %v), want (1073741824, true)", bytes, ok)
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}
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}
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func TestCgroupV1Unlimited(t *testing.T) {
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fs := fakeFS{
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"/sys/fs/cgroup/memory/memory.limit_in_bytes": "9223372036854771712",
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"/sys/fs/cgroup/memory/docker/abc/memory.limit_in_bytes": "9223372036854771712",
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"/proc/self/cgroup": "12:memory:/docker/abc",
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}
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if _, ok := cgroupV1Limit(fs.read); ok {
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t.Errorf("expected ok=false when v1 reports the unlimited sentinel everywhere")
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}
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}
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func TestCgroupV1NonDefaultPageSize(t *testing.T) {
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// The unlimited sentinel is LONG_MAX aligned to the local page
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// size, so it differs on 16 KiB and 64 KiB page kernels.
|
||||
fs := fakeFS{
|
||||
"/sys/fs/cgroup/memory/memory.limit_in_bytes": "9223372036854710272", // 64 KiB-page sentinel
|
||||
"/sys/fs/cgroup/memory/foo/memory.limit_in_bytes": "9223372036854767616", // 16 KiB-page sentinel
|
||||
"/proc/self/cgroup": "12:memory:/foo",
|
||||
}
|
||||
if _, ok := cgroupV1Limit(fs.read); ok {
|
||||
t.Errorf("expected ok=false: both values are page-aligned LONG_MAX")
|
||||
}
|
||||
}
|
||||
|
||||
func TestCgroupV1CombinedControllers(t *testing.T) {
|
||||
// Some kernels list multiple controllers per line.
|
||||
fs := fakeFS{
|
||||
"/sys/fs/cgroup/memory/memory.limit_in_bytes": "9223372036854771712",
|
||||
"/sys/fs/cgroup/memory/foo/memory.limit_in_bytes": "2147483648",
|
||||
"/proc/self/cgroup": "8:cpu,memory,blkio:/foo",
|
||||
}
|
||||
bytes, ok := cgroupV1Limit(fs.read)
|
||||
if !ok || bytes != 2147483648 {
|
||||
t.Errorf("got (%d, ok=%v), want (2147483648, true)", bytes, ok)
|
||||
}
|
||||
}
|
||||
|
||||
func TestNoCgroup(t *testing.T) {
|
||||
fs := fakeFS{
|
||||
"/proc/self/cgroup": "0::/",
|
||||
}
|
||||
if _, ok := cgroupV2Limit(fs.read); ok {
|
||||
t.Errorf("expected v2 ok=false when v2 is not mounted")
|
||||
}
|
||||
if _, ok := cgroupV1Limit(fs.read); ok {
|
||||
t.Errorf("expected v1 ok=false when v1 is not mounted")
|
||||
}
|
||||
}
|
||||
25
internal/memlimit/probe_other.go
Normal file
25
internal/memlimit/probe_other.go
Normal file
|
|
@ -0,0 +1,25 @@
|
|||
// Copyright 2026 The go-ethereum Authors
|
||||
// This file is part of the go-ethereum library.
|
||||
//
|
||||
// The go-ethereum library is free software: you can redistribute it and/or modify
|
||||
// it under the terms of the GNU Lesser General Public License as published by
|
||||
// the Free Software Foundation, either version 3 of the License, or
|
||||
// (at your option) any later version.
|
||||
//
|
||||
// The go-ethereum library is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU Lesser General Public License for more details.
|
||||
//
|
||||
// You should have received a copy of the GNU Lesser General Public License
|
||||
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
//go:build !linux
|
||||
|
||||
package memlimit
|
||||
|
||||
// platformLimit reports no platform-specific limit on non-Linux
|
||||
// systems; the caller falls back to total system memory.
|
||||
func platformLimit() (uint64, Source, bool) {
|
||||
return 0, SourceUnknown, false
|
||||
}
|
||||
28
internal/memlimit/probe_test.go
Normal file
28
internal/memlimit/probe_test.go
Normal file
|
|
@ -0,0 +1,28 @@
|
|||
// Copyright 2026 The go-ethereum Authors
|
||||
// This file is part of the go-ethereum library.
|
||||
//
|
||||
// The go-ethereum library is free software: you can redistribute it and/or modify
|
||||
// it under the terms of the GNU Lesser General Public License as published by
|
||||
// the Free Software Foundation, either version 3 of the License, or
|
||||
// (at your option) any later version.
|
||||
//
|
||||
// The go-ethereum library is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU Lesser General Public License for more details.
|
||||
//
|
||||
// You should have received a copy of the GNU Lesser General Public License
|
||||
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
package memlimit
|
||||
|
||||
import "testing"
|
||||
|
||||
// TestLimitSmoke asserts that Limit() returns a non-zero value,
|
||||
// exercising the real probe and the gopsutil fallback.
|
||||
func TestLimitSmoke(t *testing.T) {
|
||||
bytes, src := Limit()
|
||||
if bytes == 0 {
|
||||
t.Errorf("Limit() returned 0 bytes (source=%s); expected non-zero on any sane host", src)
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue