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重庆思庄Linux技术分享- AnonPages 内存怎么释放

  • 2026-01-27 09:15:47
重庆思庄Linux技术分享- AnonPages 内存怎么释放
AnonPages(匿名页面)的释放由 Linux 内核自动管理,主要通过进程退出回收和内存紧张时的 LRU 回收(写入 Swap) 实现,用户无法直接手动释放。但可通过排查异常占用、优化进程行为等方式,间接减少 AnonPages 占用,避免内存浪费。
一、核心原理:为什么不能 “手动释放” AnonPages?
AnonPages 存储的是进程的动态数据(堆、栈、匿名映射),这些数据是进程运行的必要资源 —— 只要进程未退出,其正在使用的 AnonPages 就无法强制释放(否则会导致进程崩溃或数据损坏)。内核仅在两种场景下自动释放 AnonPages:
进程退出:进程终止后,内核会回收其所有 AnonPages(包括堆、栈内存)。
内存紧张时的 LRU 回收:当系统物理内存不足,内核通过 LRU 算法,将 “近期未使用” 的 AnonPages 写入 Swap 分区,释放物理内存;若进程再次访问这些页面,会从 Swap 读回(触发 “缺页中断”)。
二、减少 AnonPages 占用的关键操作(按优先级)
1. 排查并终止 “异常占用 AnonPages 的进程”(最直接)
AnonPages 过高通常是个别进程 “内存泄漏” 或 “过度分配内存” 导致,需先定位这类进程并处理。
步骤 1:定位高 AnonPages 进程通过 /proc/[PID]/smaps 查看单个进程的匿名内存占用,按占用大小排序:
bash
# 遍历所有进程,统计每个进程的 AnonPages 总和,按大小降序排列
for pid in $(ls /proc | grep -E '^[0-9]+$'); do
  if [ -f /proc/$pid/smaps ]; then
    anon=$(grep -E '^Anonymous:' /proc/$pid/smaps | awk '{sum+=$2} END{print sum " KB"}')
    name=$(cat /proc/$pid/comm 2>/dev/null)
    echo "$pid $name $anon"
  fi
done | sort -k3 -nr | head -10  # 显示前10个高 AnonPages 进程
步骤 2:处理异常进程
若进程是 “无用后台进程”(如僵尸进程、冗余服务):直接终止,释放其 AnonPages。
bash
kill -9 <异常进程PID>  # 强制终止进程
若进程是 “业务进程但内存泄漏”:需修复代码(如未释放的 malloc/new 内存),或临时重启进程缓解(治标)。
2. 优化进程内存分配逻辑(根治内存泄漏)
若高 AnonPages 是 “内存泄漏” 导致(进程运行时间越长,AnonPages 越大),需从代码层面优化:
开发阶段:用 valgrind --tool=memcheck 检测未释放的内存块,定位泄漏代码(如忘记 free/delete 的动态内存)。
bash
valgrind --tool=memcheck --leak-check=full ./your_program  # 运行程序并检测泄漏
生产阶段:用 gcore 生成进程内存快照,结合 gdb 分析堆内存结构,定位持续增长的内存区域(如无限循环分配内存)。
3. 配置 Swap 分区,辅助内核回收 AnonPages
若系统未配置 Swap,内核无法回收 “非活跃 AnonPages”(只能杀死进程释放内存),需确保 Swap 正常启用:
检查 Swap 状态:
bash
swapon --show  # 查看已启用的 Swap
free -h        # 确认 Swap 可用
临时启用 Swap 文件(若未配置):
bash
# 创建 4GB Swap 文件
dd if=/dev/zero of=/swapfile bs=1G count=4
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile
注意:Swap 是 “物理内存的补充”,频繁写入 Swap 会导致 I/O 瓶颈,需结合步骤 1-2 减少 AnonPages 占用,而非依赖 Swap。
4. 启用 AnonHugePages,减少页表开销(间接优化)
AnonHugePages 是 AnonPages 的 “大页版本”(默认 2MB/1GB),虽不直接减少 AnonPages 总量,但能减少页表数量(降低内核内存开销),间接提升内存管理效率:
检查 AnonHugePages 状态:
bash
cat /sys/kernel/mm/transparent_hugepage/enabled  # 显示 [always] 表示已启用
临时启用(若未启用):
bash
echo always > /sys/kernel/mm/transparent_hugepage/enabled
永久启用:在 /etc/rc.local 或内核参数中添加配置(需重启生效)。
三、常见误区:避免无效操作
不要尝试 “手动清空缓存” 释放 AnonPages:
echo 3 > /proc/sys/vm/drop_caches 仅能释放 “文件缓存(Page Cache)”,无法释放 AnonPages(文件缓存与 AnonPages 是完全不同的内存类型)。
不要强制杀死 “必要业务进程”:
终止核心进程会导致业务中断,需优先排查内存泄漏或优化代码,而非简单重启。
总结
AnonPages 的释放依赖 “进程退出” 和 “内核自动回收”,用户无法直接手动释放。核心解决思路是:定位异常占用进程→处理内存泄漏→配置 Swap 辅助回收。通过工具排查高 AnonPages 进程,结合代码优化或进程重启,可有效减少 AnonPages 占用,避免内存紧张。

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  1. CONNECT:[ UseTime:0.000616s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000908s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000896s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001065s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000444s ]
  6. SELECT * FROM `set` [ RunTime:0.000228s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000620s ]
  8. SELECT * FROM `article` WHERE `id` = 460365 LIMIT 1 [ RunTime:0.000578s ]
  9. UPDATE `article` SET `lasttime` = 1770575699 WHERE `id` = 460365 [ RunTime:0.013359s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000229s ]
  11. SELECT * FROM `article` WHERE `id` < 460365 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001732s ]
  12. SELECT * FROM `article` WHERE `id` > 460365 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000703s ]
  13. SELECT * FROM `article` WHERE `id` < 460365 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005201s ]
  14. SELECT * FROM `article` WHERE `id` < 460365 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000648s ]
  15. SELECT * FROM `article` WHERE `id` < 460365 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002248s ]
0.096314s