adventures in booting
Kyrre Ness Sjobak
kyrre at solution-forge.net
Sat Dec 4 14:16:27 UTC 2004
tor, 02.12.2004 kl. 18.59 skrev Colin Walters:
> On Thu, 2004-12-02 at 12:40 -0500, David Zeuthen wrote:
>
> > I'm almost positive it requires kernel changes to do this the right way;
> > one naive idea is to have a userspace daemon, capturing what blocks are
> > read when (kernel tells this daemon using the kernel events layer). This
> > would run in the first three minutes on each and every boot. When the
> > system is idle (and only when running on AC power!) another daemon
> > rearranges blocks on the disk. What blocks to rearrange could be the
> > result of a computation involving several three-minute result sets.
>
> Rearranging sounds complex and dangerous, since it requires deep
> integration with the filesystem. The online resizing took quite a long
> time to appear and that is conceptually much simpler. Why not do it on
> the block device layer (without knowledge of the filesystem) and just
> copy those blocks to a reserved area of the block device? Disks are
> big, duplicating say 100MB for this purpose wouldn't be bad. We would
> need to ensure that mkfs.ext3 would leave enough space for this though
> (and probably whatever does the copying would have to make sure that the
> filesystem wasn't in the way; perhaps an ext flag).
>
Hmm... /boot is usually quite "overbig", and must be situated within a
booting (ie. not at the end) part of the disk...
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