svn commit: r345491 - in head/sys: conf fs/tmpfs modules/tmpfs

Cy Schubert Cy.Schubert at cschubert.com
Mon Mar 25 19:17:39 UTC 2019


In message <3398a21318a4a6715609004d569d20de86f1dc7a.camel at freebsd.org>
, Ian Le
pore writes:
> 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.

Yes, I should have been more clear. I can see using a tuneable on a 2 
GB or 4 GB Intel pandaboard. (Perfect for a firewall or a UPS 
management station.)


-- 
Cheers,
Cy Schubert <Cy.Schubert at cschubert.com>
FreeBSD UNIX:  <cy at FreeBSD.org>   Web:  http://www.FreeBSD.org

	The need of the many outweighs the greed of the few.




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