svn commit: r345491 - in head/sys: conf fs/tmpfs modules/tmpfs
Ian Lepore
ian at freebsd.org
Mon Mar 25 14:13:04 UTC 2019
On Mon, 2019-03-25 at 05:42 -0700, Cy Schubert wrote:
> In message <201903250746.x2P7kKUu019786 at repo.freebsd.org>, Allan
> Jude
> writes:
> > Author: allanjude
> > Date: Mon Mar 25 07:46:20 2019
> > New Revision: 345491
> > URL: https://svnweb.freebsd.org/changeset/base/345491
> >
> > Log:
> > Make TMPFS_PAGES_MINRESERVED a kernel option
> >
> > TMPFS_PAGES_MINRESERVED controls how much memory is reserved for
> > the system
> > and not used by tmpfs.
> >
> > On very small memory systems, the default value may be too high
> > and this
> > prevents these small memory systems from using reroot, which is
> > required
> > for them to install firmware updates.
> >
> > Submitted by: Hiroki Mori <yamori813 at yahoo.co.jp>
> > Reviewed by: mizhka
> > Differential Revision: https://reviews.freebsd.org/D13583
> >
> > Modified:
> > head/sys/conf/options
> > head/sys/fs/tmpfs/tmpfs.h
> > head/sys/fs/tmpfs/tmpfs_vfsops.c
> > head/sys/modules/tmpfs/Makefile
> >
>
> Would this be a good candidate for a sysctl or tuneable?
>
The small-memory embedded systems most affected by this often don't use
loader(8) at all, so tunables aren't an option, and sysctl may be too
late. No reason it can't be a tunable as well, but it'll probably need
to remain as a compile-time option too.
-- Ian
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