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Linux内存的VM参数

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[root@buildroot ~]# sysctl -a | grep "vm"
sysctl: error reading key 'net.ipv4.route.flush': Permission denied
vm.admin_reserve_kbytes = 8192
vm.block_dump = 0
vm.dirty_background_bytes = 0
vm.dirty_background_ratio = 10
vm.dirty_bytes = 0
vm.dirty_expire_centisecs = 3000
vm.dirty_ratio = 20
vm.dirty_writeback_centisecs = 500
vm.drop_caches = 0
vm.extra_free_kbytes = 0
vm.highmem_is_dirtyable = 0
vm.laptop_mode = 0
vm.legacy_va_layout = 0
vm.lowmem_reserve_ratio = 32 32
vm.max_map_count = 65530
vm.min_free_kbytes = 1970
vm.min_free_order_shift = 1
vm.mmap_min_addr = 4096
vm.nr_pdflush_threads = 0
vm.oom_dump_tasks = 1
vm.oom_kill_allocating_task = 0
vm.overcommit_memory = 0
vm.overcommit_ratio = 50
vm.page-cluster = 3
vm.panic_on_oom = 0
vm.percpu_pagelist_fraction = 0
vm.scan_unevictable_pages = 0
vm.stat_interval = 1
vm.swappiness = 60
vm.user_reserve_kbytes = 15712
vm.vfs_cache_pressure = 100

proc文件系统:ls /proc/sys/vm/

overcommit_memory

内核分配内存的策略,有0,1,2三种

overcommit_memory说明
0表示内核将检查是否有足够的可用内存供应用进程使用;如果有足够的可用内存,内存申请允许;否则,内存申请失败,并把错误返回给应用进程。
1表示内核允许分配所有的物理内存,而不管当前的内存状态如何
2表示内核允许分配超过所有物理内存和交换空间总和的内存
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  • 本文作者: Winddoing
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