Arjan van de Ven (arjan(a)fenrus.demon.nl) said:
Another one is __log_buf; this is currently 128Kb. Arguably it's
important for debugging to get 128Kb of dmesg info, but I wonder if 64Kb
would be enough as well, it's another easy save by setting
CONFIG_LOG_BUF_SHIFT to 16.
64k of savings I'm not sure is enough - you can get more by whacking
userspace. The 2+MB from NR_CPUS looks worthwhile.
A third one is disabling CPU hotplug. CPU hotplug keeps quite a bit
of
code in the kernel, that otherwise is boot-time only and gets evicted
right after boot..... You could argue the same for PCI hotplug but
cardbus is sort of the party spoiler there I suppose.
Xen and other virt stuff trips you up here.
Bill