On Fri, Feb 8, 2013 at 5:49 PM, H. Peter Anvin <h...@zytor.com> wrote: > Yes, but you can't umount rootfs.
But that was not a rootfs, but tmpfs/ramfs mounted to /root folder. > > "Kasatkin, Dmitry" <dmitry.kasat...@intel.com> wrote: > >>On Wed, Feb 6, 2013 at 6:41 PM, H. Peter Anvin <h...@zytor.com> wrote: >>> The cleanup is not a umount, it is actually a tree walk unlinking the >>contents. >>> >> >>Please see that umounting ramfs releases the memory. >>There was no forced cleanup. >>"cp" copied about 2GB of content. >>After umounting we got 2GB back to free RAM... >> >>kds@kds:~$ sudo mount -t ramfs testramfs /test >>kds@kds:~$ sudo cp -r /usr/ /test >>kds@kds:~$ du -sm /test >>2154 /test >>kds@kds:~$ free >> total used free shared >>buffers cached >>Mem: 8058600 7855780 202820 0 24768 >>4819136 >>-/+ buffers/cache: 3011876 5046724 >>Swap: 0 0 0 >>kds@kds:~$ sudo umount /test >>kds@kds:~$ free >> total used free shared >>buffers cached >>Mem: 8058600 5644864 2413736 0 25268 >>2623956 >>-/+ buffers/cache: 2995640 5062960 >>Swap: 0 0 0 >> >>The same happens also with tmpfs. >> >>- Dmitry >> >>> "Kasatkin, Dmitry" <dmitry.kasat...@intel.com> wrote: >>> >>>>On Wed, Feb 6, 2013 at 7:04 AM, H. Peter Anvin <h...@zytor.com> wrote: >>>>> On 02/05/2013 02:09 PM, Kasatkin, Dmitry wrote: >>>>>> >>>>>> >>>>>> It should not be like that. Actually when pre-init exits, cleanup >>>>code >>>>>> umount tmpfs, which in turn cleanups the RAM. >>>>>> >>>>> >>>>> It doesn't quite... the rootfs is permanent. This is also only one >>>>usage >>>>> mode: there are quite a few Linux systems running directly out of >>>>initramfs. >>>>> >>>> >>>>rootfs is not permanent when it is ramfs. It is cleaned up on switch >>>>root. >>>>It is easy to find out that it is empty by mounting : mount -t ramfs >>>>rootfs /mnt/ >>>> >>>>In the case of running from normal storage, of course, there is >>>>ridicules remove the content. >>>> >>>>- Dmitry >>>> >>>> >>>>> -hpa >>>>> >>>>> >>>>> -- >>>>> H. Peter Anvin, Intel Open Source Technology Center >>>>> I work for Intel. I don't speak on their behalf. >>>>> >>> >>> -- >>> Sent from my mobile phone. Please excuse brevity and lack of >>formatting. > > -- > Sent from my mobile phone. Please excuse brevity and lack of formatting. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
