在 2012年2月16日 下午9:33，黄小伟 <jingle2422@163.com> 写道：
I know this, but I want to reclaim dynamically. Say in a shout time, several seconds.
http://www.kernel.org/doc/Documentation/sysctl/vm.txt 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. So the left thing, you could write down scripts or codes to do the action above while detecting the operation of the device.
在 2012-02-16 21:21:11，"Manish Katiyar" <mkatiyar@gmail.com> 写道：
2012/2/16 黄小伟 <jingle2422@163.com>:
Hi I encounter a problem recentely. My system supports USB strorage and other network applications. But after I put a file to usb storage, it will consume some many momory. (buffer + cache). And these buffered memory can not be reclaimed(use free command). So I want to know how to reclaim the buffer memory in a short time.
Google for ./sys/vm/drop_caches
-- Thanks - Manish
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-- Best Regards Lin