On Sun, Jun 24, 2018 at 12:20 PM, MikeB said:
> So, I created a block-based root disk and started using
> switch_root early in boot. So far, so good.
>
> However, I see almost no difference in memory usage after the
> switch_root (looking at slabtop and /proc/meminfo).
I drop caches right before I switch_root with this line:
echo 3 > /proc/sys/vm/drop_caches
You could see if that helps.
> Am I correct in unmounting/switch_root/re-mounting for these
> filesystems?
I mount them all again under the new root directory before I
switch_root. I imagine mounting them after switch_root would
work too. Doing it before allows me to chroot before I
switch_root. I only bother with umounting /dev/pts/. I would
be surprised if switch_root moved or remounted the pseudo
filesystems for you automatically.
Peace, James
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