Messages in this thread | | | Date | Wed, 27 Jul 2005 01:21:14 +0200 | From | Marc Ballarin <> | Subject | Re: Reclaim space from unused ramdisk? |
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On Tue, 26 Jul 2005 15:16:58 -0700 Mike Mohr <akihana@gmail.com> wrote:
> I wonder if it would be possible to somehow reclaim space that has > been previously reserved for a ramdisk without rebooting. I read the > ramdisk docs in the latest kernel source and it seems that it is not > currently possible. However, the kernel keeps track of the memory > allocated for said ramdisks; would it not be possible with root (or > even kernel) permissions to remove the flag that prevents the VM > subsystem from reclaiming that space? I realize that rot permissions > may not be high enough. In that case, could a module be written that > takes a device name as a parameter then uses it to look up the > reserved memory that device uses, then resets the necessary flag and > finally unloads itself? It would have to check that the filesystem > was unmounted, of course. > > How difficult would this be to write?
Hi,
ramfs (always there) and tmpfs (optional) already do this. tmpfs can be swapped out, ramfs always uses physical memory.
mount -t ramfs none /mnt/blah mount -t tmpfs none /mnt/blah
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