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linux清除cache方法

關於drop_caches檔案:系統預設為0


在Documentation/sysctl/vm.txt中有如下描述:

drop_caches

Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free.

To free pagecache:僅清除頁面快取(PageCache)
 echo 1 > /proc/sys/vm/drop_caches

To free dentries and inodes:清除目錄項和inode
 echo 2 > /proc/sys/vm/drop_caches

To free pagecache, dentries and inodes:清除頁面快取,目錄項和inode
 echo 3 > /proc/sys/vm/drop_caches

As this is a non-destructive operation and dirty objects are not freeable, the user should run `sync' first.