/proc/sys/vm/drop_caches (since Linux 2.6.16)
Writing to this file causes the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free.
To free pagecache, use echo 1 > /proc/sys/vm/drop_caches
to free dentries and inodes, use echo 2 > /proc/sys/vm/drop_caches
to free pagecache, dentries and inodes, use echo 3 > /proc/sys/vm/drop_caches.
本文介绍如何通过写入/proc/sys/vm/drop_caches来释放Linux系统的内存缓存,包括页缓存、目录项和inode。为了确保数据一致性,建议在执行此操作前先同步文件系统。
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