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清理内存

1. drop_caches

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:echo 1 > /proc/sys/vm/drop_caches
# To free dentries and inodes:echo 2 > /proc/sys/vm/drop_caches
# To free pagecache, dentries and inodes: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.
2. c

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