GENERIC make buildkernel error / fails - posix_fadvise

[Joe Ennis]

On Thu, 12 Jan 2012 19:11:54 -0800
Garrett Cooper <yanegomi at gmail.com> wrote:

> On Thu, Jan 12, 2012 at 5:52 PM, Doug Barton <dougb at freebsd.org>
> wrote:
> >
> >>> chflags -R noschg /usr/obj/usr
> >>> rm -rf /usr/obj/usr
> >
> > It's much faster to do:
> >
> > /bin/rm -rf ${obj}/* 2> /dev/null || /bin/chflags -R 0 ${obj}/* &&
> > /bin/rm -rf ${obj}/*
> 
> +1. And it's faster yet when you can run parallel copies of rm on
> different portions of the directory tree (e.g. xargs, find [..] -exec)
> as rm is O(n).
> Cheers,
> -Garrett
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What I've been doing just before I do a make buildworld/buildkernel
is:

mdmfs -s2g md1 /usr/obj

on a clean /usr/obj . If I need to recompile before a boot, just umount
and recreate.

Provides a little performance boost too.

Regards,

--
joe