On 11/17/2011 10:21 PM, Dave Reisner wrote:
On Fri, Nov 18, 2011 at 11:42:43AM +1100, Tom Gundersen wrote:
On Fri, Nov 18, 2011 at 5:23 AM, Thomas Bächler<[email protected]> wrote:
Am 17.11.2011 18:07, schrieb Tom Gundersen:
I see two potential issues: boot speed and memory use. Moving stuff
around in memory should be pretty much instantaneous, and the memory
(a couple of MB) will be swapped out quick enough so it shouldn't make
a difference.
I'd be happy to write a new patch where this is optional, but I don't
think we should optimize for stuff unless we know it is a measurable
problem.
Depending on what's in there, it could be big. For example, I once wrote
a hook that extracted a tarfile that was stored inside initramfs (that
tarfile was the whole root filesystem IIRC).
That's something to take into consideration. I think it would be best
if we were able to optimize the cases that need it by adding some
exceptions to the copying, but still keep the bits needed for
shutdown++, rather than disabling it altogether. Having huge
initramfs' being a corner case, any workaround should of course be
unintrusive (if that is not possible then I agree on just allowing
this stuff to be switched off).
[untested: would bindmounting a directory (like say /lib/modules) to
itself exclude it from "cp -ax"?]
No, it won't. Generally, detection of crossing onto another mount is
done by comparing the devno of '.' to the devno of '..'. Bind mounts
aren't special in this regard -- they'll just expose the underlying
physical mount.
Mmm no, you can not access to files in underliying mount from such path.
Anyway the rootfs is the HEAD of vfsmount, so you can not
bind/move/pivot. :P
But supose that you can do a bindmount... -a is used that implies -d,
that implies --preserve=links, in that case cp will fails because will
try to create a link to directory. ;)
Why no just copy the needed files? Yes needs more steps...
Other than that, people WILL complain.
Undoubtedly. They always do.
Always.
d
--
Gerardo Exequiel Pozzi
\cos^2\alpha + \sin^2\alpha = 1
