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Linux开发必看|内存调试常用命令,从查看总量到排查泄漏全搞定

  • 2026-07-02 02:51:36
Linux开发必看|内存调试常用命令,从查看总量到排查泄漏全搞定
本文档介绍 Linux 开发过程中内存的常用命令,查看内存总大小信息、使用情况以及内存预留大小
1. total 内存信息
1.1 meminfo
cat /proc/meminfo
MemTotal1497696 kB      Memtotal = MemFree + Buffers + CachedMemFree590524 kBMemAvailable773252 kBBuffers768 kBCached216892 kBSwapCached14204 kBActive260884 kBInactive176744 kBActive(anon): 120620 kBInactive(anon): 106688 kBActive(file): 140264 kBInactive(file): 70056 kBUnevictable3224 kBMlocked3224 kBSwapTotal748844 kB      SwapTotal/SwapFree:是系统脚本中通过 swap 命令启用、分配SwapFree346156 kBDirty776 kBWriteback0 kBAnonPages220804 kBMapped194276 kBShmem4968 kBKReclaimable43900 kBSlab111060 kB             Slab 当前使用大小,如果增长太大可能内存泄漏SReclaimable40648 kB      Slab 可回收内存SUnreclaim70412 kB        Slab 不可回收内存KernelStack18496 kBPageTables42096 kBNFS_Unstable0 kBBounce0 kBWritebackTmp0 kBCommitLimit1497692 kBCommitted_AS41751048 kBVmallocTotal263061440 kB   Vmalloc 总大小VmallocUsed30368 kB        Vmalloc 已用大小VmallocChunk0 kBPercpu2528 kBCmaTotal532480 kBCmaFree0 kB                注:CMA 被系统借用,也属于被使用,CmaFree 会减小 
1.2 sysrq-trigger
sysrq-trigger 是 Linux 内核提供的紧急调试接口,不用重启就能获取系统底层信息。
echo m > /proc/sysrq-trigger
执行上述命令,内核会把所有内存统计数据打印出来
作用:排查内存泄漏、OOM(内存溢出)、系统卡顿、内核内存占用异常。

2 kernel 内存信息
2.1 slab
内核申请的内存调试接口,编译需要打开两个宏定义:
CONFIG_SLUB_SYSFS=yCONFIG_SLUB_DEBUG=y
统计 slab 总大小命令:
echo `cat /proc/slabinfo |awk 'BEGIN{sum=0;}{sum=sum+$3*$4;}END{printsum/1024/1024}'` MB
2.2 memblock
系统预留内存调试接口,编译需要在 bootargs 中添加 memblock=debug:
chosen {    bootargs = "earlycon=uart8250,mmio32,0xff570000 console=ttyFIQ0memblock=debug";};
2.3 zoneinfo
打印 Linux 内核内存物理分区(内存域 Zone)。
内存域(Zone):Linux 把物理内存按硬件寻址、用途分成多个区域,DMA、DMA32、Normal、HighMem、Movable,执行以下命令打印这些区域详细信息:
cat /proc/zoneinfo

3 空闲内存
3.1 free
total:内核页管理的总内存;
used:正在被使用的内存;
free:空闲的内存;
shared:共享的内存,如匿名页;
buffers:缓冲内存数;
cached:缓存内存数;
注:buffers是把分散写入操作保存到内存中,当达到一定程度集中写入硬盘;cached是读取数据保存到内存,当再次读取硬盘数据则直接从内存读取;

4 清除缓存
4.1 drop_caches
清空 pagecache
echo 1 > /proc/sys/vm/drop_caches
清空 dentries 和 inodes
echo 2 > /proc/sys/vm/drop_caches
清空所有缓冲(pagecache、dentries 和 inodes)
echo 3 > /proc/sys/vm/drop_caches

5 虚拟内存使用情况
5.1 vmallocinfo
执行以下命令查看:
cat /proc/vmallocinfo
5.2 vmstat
执行以下命令查看:
cat /proc/vmstat

6 内存压力
6.1 pressure
执行以下命令查看:
cat /proc/pressure/memory- VSS- Virtual Set Size 虚拟耗用内存(包含共享库占用的内存)- RSS- Resident Set Size 实际使用物理内存(包含共享库占用的内存)- PSS- Proportional Set Size 实际使用的物理内存(比例分配共享库占用的内存)- USS- Unique Set Size 进程独自占用的物理内存(不包含共享库占用的内存)一般来说内存占用大小有如下规律:VSS >= RSS >= PSS >= USS

以上就是Linux开发中最常用的内存相关命令,如果你在使用这些命令时遇到疑问,或者有其他高频内存命令补充,欢迎在评论区留言交流,一起提升调试效率!

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  1. CONNECT:[ UseTime:0.000845s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000665s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.015294s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006589s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000614s ]
  6. SELECT * FROM `set` [ RunTime:0.002224s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000596s ]
  8. SELECT * FROM `article` WHERE `id` = 492129 LIMIT 1 [ RunTime:0.001570s ]
  9. UPDATE `article` SET `lasttime` = 1783086242 WHERE `id` = 492129 [ RunTime:0.012119s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000343s ]
  11. SELECT * FROM `article` WHERE `id` < 492129 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001775s ]
  12. SELECT * FROM `article` WHERE `id` > 492129 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001849s ]
  13. SELECT * FROM `article` WHERE `id` < 492129 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004487s ]
  14. SELECT * FROM `article` WHERE `id` < 492129 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001060s ]
  15. SELECT * FROM `article` WHERE `id` < 492129 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001923s ]
0.189620s