前言 这篇文章的全称应该叫:[在某些内核版本上,cgroup 的 kmem account 特性有内存泄露问题],如果你遇到过 pod 的 cannot allocated memory 报错,node...内核日志的 SLUB: Unable to allocate memory on node -1 报错,那么恭喜你中招了。...2、节点上执行 dmesg 有日志显示:slub无法分配内存:SLUB: Unable to allocate memory on node -1 ?...,memory=100Mi' --limits="cpu=200m,memory=200Mi" 然后 docker ps | grep nginx-1 得到容器 id find /sys/fs/cgroup...slub 分配机制 因为节点 dmesg 的报错是:SLUB: Unable to allocate memory on node -1 cgroup 限制下,当用户空间使用 malloc 等系统调用申请内存时
Bug #1: 诊断修复不稳定的 Kmem Accounting 关键词:SLUB: Unable to allocate memory on node -1 社区相关 Issue: https://github.com...: Unable to allocate memory on node -1” 信息。...同时捕获到性能抖动的前后,在 node 内存资源充足的情况下,dmesg 返回的结果也会出现大量 “SLUB: Unable to allocate memory on node -1” 的信息。...//memory.kmem.slabinfo cat: memory.kmem.slabinfo: Input/output error Bug #2:诊断修复网络设备引用计数泄漏问题...1 .
Kubernetes中Cgroup泄漏问题 Cgorup文档: https://www.kernel.org/doc/Documentation/cgroup-v1/memory.txt 绝大多数的...memory unable to ensure pod container exists: failed to create container for [kubepods burstable podd5dafc96...90fd-c75758746a7a: cannot allocate memory 使用dmesg查看系统日志的错误内容信息 SLUB: Unable to allocate memory on node...-b1ae-c0d27925aa84: cannot allocate memory #96701 (comment) Set cgroup.memory=nokmem in grub: see application...kernel memory accounting 机制为 cgroup 的内存限制增加了 stack pages(例如新进程创建)、slab pages(SLAB/SLUB分配器使用的内存)、sockets
GFP_ZERO) && object) memset(object, 0, s->object_size); slab_post_alloc_hook(s, gfpflags, 1,...If we mistakenly see no partial slabs then we * just allocate an empty slab....static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) { struct page *page...); flags |= s->allocflags; /* * Let the initial higher-order allocation fail under memory...page->freelist = fixup_red_left(s, start); } page->inuse = page->objects; page->frozen = 1;
1G内存的低配机器使用yum安装软件时报“[Errno 5] [Errno 12] Cannot allocate memory”通过增加swap解决 yum安装报错“[Errno 5] [Errno...12] Cannot allocate memory” free -m查看可用内存(available)很少了并且swap是0 # fallocate -l 512M /swapfile # chmod
freelist)) { // 如果伙伴系统中无法分配 slub 所需的 page,那么就提示内存不足,分配失败,返回 null slab_out_of_memory(s.../* * Try to allocate a partial slab from a specific node. */ static void *get_partial_node(struct kmem_cache...static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node) { return allocate_slab(...kmem_cache_node 中包含的 slub 个数加 1,包含的总对象个数加 page->objects inc_slabs_node(s, page_to_nid(page), page...static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) { // 获取 slab 的起始内存地址
that we're going to allocate will be freeable * or/and it will be released eventually, so to avoid...; unsigned int compact_defer_shift; int compact_order_failed; #endif ZONE_PADDING(_pad1_...wait_table_hash_nr_entries -- the size of the hash table array * wait_table_bits -- wait_table_size == (1...()/unlock_memory_hotplug()....unsigned inuse:16; unsigned objects:15; unsigned frozen:1;
但是现实中很多时候却以字节为单位,不然申请10Bytes内存还要给1页的话就太浪费了。slab分配器就是为小内存分配而生的。slab分配器分配内存以Byte为单位。...(void) { int ret = -1; slub_test = kmem_cache_create("slub_test", sizeof(struct student), 0,...struct kmem_cache_node:是对共享内存缓存池的描述,用于管理每个Node的slab页面; ?...allocate_slab else get_freepointer_safe //1.先从 kmem_cache_cpu->freelist...接着去 kmem_cache_node->partital链表分配,如果此链表为null ? 重新分配一个slab。
报错详细描述 在搭建 HDFS 高可用集群的过程中,执行 hdfs namenode -bootstrapStandby 进行同步的时候出现报错: FATAL ha.BootstrapStandby: Unable...to fetch namespace information from active NN at node1/192.168.146.111:8020: Call From node2/192.168.146.112...to node1:8020 failed on connection excep tion: java.net.ConnectException: Connection refused; For more...解决步骤(详细剖析) 20/11/21 01:34:16 INFO ipc.Client: Retrying connect to server: node1/192.168.146.111:8020....依旧无法感受到 node1 已经启动 NameNode 并处于 active 状态——Unable to fetch namespace information from active NN at node1
再上一节了解了SLUB是如何申请一个object的,其中涉及了从当前的freelist申请,以及kmem_cache_cpu->partital链表申请,以及到最后的kmem_cache_cpu→node...* The @flags argument may be one of: * * %GFP_USER - Allocate memory on behalf of user. May sleep...* * %GFP_KERNEL - Allocate normal kernel ram. May sleep....* * %GFP_HIGHUSER - Allocate pages from high memory....* * %__GFP_THISNODE - Allocate node-local memory only. static __always_inline void *kmalloc(size_t
xxxxx (1)ORA-04031: unable to allocate 3896 bytes of shared memory ("shared pool","select inst_id, reg_id...xxxxx (1)ORA-04031: unable to allocate 3896 bytes of shared memory ("shared pool","select inst_id, reg_id...xxxxx (1)ORA-04031: unable to allocate 3896 bytes of shared memory ("shared pool","select inst_id, reg_id...xxxxx (1)ORA-04031: unable to allocate 3896 bytes of shared memory ("shared pool","select inst_id, reg_id...xxxxx (1)ORA-04031: unable to allocate 3896 bytes of shared memory ("shared pool","select inst_id, reg_id
file /u01/app/grid/diag/asm/+asm/+ASM2/trace/+ASM2_lmd0_2032294.trc (incident=186256): ORA-04031: unable...TO allocate 3768 bytes OF shared memory ("shared pool","unknown object","sga heap(1,0)","ges enqueues...TO allocate 3768 bytes OF shared memory ("shared pool","unknown object","sga heap(1,0)","ges enqueues...obtained FROM CSS = 2, checking FOR the existence OF node 0...ORACLE_HOME = /u01/app/11.2.0.3/grid System name: AIX Node name: orcldb2 Release: 1 Version: 6 Machine
一、术语 1、索引(index) 相当于关系数据库当中的数据库 2、文档(document) 相当于MySQL中的一行记录,但是ES中的文档没有固定结构 3、文档类型(type) 一个索引当中可以用不同的文档类型代表不同的数据集合...二、配置 //文件elasticsearch.yml #集群名称 cluster.name: elasticsearch_dev #节点名称 node.name: node-102 #节点属性.../es/logs #设置内存锁 bootstrap.memory_lock: true #绑定的IP地址,默认为0.0.0.0 network.host: 192.168.56.102 #对外服务的...Unable to lock JVM Memory: error=12, reason=Cannot allocate memory 解决办法:设置配置当中 bootstrap.memory_lock...-102", "cluster_name": "elasticsearch_dev", "cluster_uuid": "PUxoA1mSTsGzGBZB7S6ZHQ", "version
*/ struct list_head list; /* List of slab caches */ struct kmem_cache_node *node[MAX_NUMNODES.../= 2; } min_objects--; } /* * We were unable to place multiple objects...Now * lets see if we can place a single object there. */ order = slab_order(size, 1, slub_max_order..., 1); if (order <= slub_max_order) return order; /* * Doh this slab cannot be...placed using slub_max_order. */ order = slab_order(size, 1, MAX_ORDER, 1); if (order < MAX_ORDER
oo:低16位代表一个slab中所有object的数量(oo & ((1 << 16) - 1)),高16位代表一个slab管理的page数量((2^(oo 16)) pages)。..., the buf points to 16 bytes of memory*/ char*buf = kmeme_cache_alloc(kmem_cache_16, GFP_KERNEL); /*...* do something what you what, don't forget to release the memory after use */ kmem_cache_free...4. slub分配内存原理 当调用kmem_cache_alloc()分配内存的时候,我们可以从正在使用slab分配,也可以从per cpu partial分配,同样还可以从per node partial...Needed because the compiler may complain */ return-1; }
failed; error='Cannot allocate memory' (errno=12) # # There is insufficient memory for the Java Runtime...image.png 现在我再次启动发现“Cannot allocate memory”问题解决了,但是又抛出一个新的异常。...image.png 切换到elasticsearch用户,然后启动elasticserach,发现还是抛出"Unable to access 'path.data' "异常。...1.[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]...------------------------------------ # # Use a descriptive name for the node: # node.name: node-1 #
操作系统中可以通过procfs查看伙伴系统的分配情况,如下: $ cat /proc/buddyinfo Node 0, zone DMA 1 1 0...0 2 1 1 0 1 1 3 Node 0, zone DMA32 3416 4852 3098 3205...此slab处于冻结状态,将p1链入p3->freelist中; p3位于kmem_cache_node->partial链表中,此时释放分为两种情况: 3.1 释放p1后,p3的状态为半满。...此时除了将p1链入p3的freelist以外,还需要判断node中slab数是否超过规定值(node->nr_partial >= min_partial)。...参考文章 Buddy memory allocation 图解SLUB/lukuen 图解SLUB/smcdef The Linux kernel memory allocators from an exploitation
需要特别注意的地方是,对字节码的修改需要开辟出一块新的内存空间,因此就像向操作系统申请内存空间使用如malloc一样,你需要使用(*jvmti)->Allocate在JVM内部申请出一块内存空间,参考如下代码...class_data_len; *new_class_data_len = size; //为新的class字节码数据区分配JVM内存 error = (*jvmti)->Allocate...*node, void *key) { struct method_t *t = container_of(node, struct method_t, node); int i = hash_test...*node = hashmap_get(&map, key); if (node == NULL) { printf("%s not found\n", key...我们可以记录该线程的执行和CPU-Time,参考代码如下: #include #include #include #include <jvmti.h
功能比SLUB DEBUG齐全并且支持实时检测。越界访问的严重性和危害性通过我之前的文章(SLUB DEBUG技术)应该有所了解。正是由于SLUB DEBUG缺陷,因此我们需要一种更加强大的检测工具。...这部分额外的内存被称作shadow memory(影子区)。KASAN将1/8的内存用作shadow memory。...首先看一下伙伴系统allocate page(s)函数填充shadow memory情况。 ? 假设我们从buddy system分配4 pages。...SLUB分配对象的内存的shadow memory值如何填充? 当我们打开KASAN的时候,SLUB Allocator管理的object layout将会放生一定的变化。如下图所示。 ?...输出的信息很丰富,包含了bug发生的类型、SLUB输出的object内存信息、Call Trace以及shadow memory的状态值。其中红色信息都是比较重要的信息。
", "transport_address" : "xx.0.96.9:9300", "node_attributes" : { "ml.machine_memory...", "transport_address" : "xx.0.96.20:9300", "node_attributes" : { "ml.machine_memory..."explanation" : "a copy of this shard is already allocated to this node [[wr_index_1][1], node[yvtpqeypTke6aFxxwYSjjA...: { "root_cause" : [ { "type" : "illegal_argument_exception", "reason" : "unable...=false]" } ], "type" : "illegal_argument_exception", "reason" : "unable to find any
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