Date: Mon, 25 Mar 2019 12:17:29 -0700 From: Cy Schubert <Cy.Schubert@cschubert.com> To: Ian Lepore <ian@freebsd.org> Cc: Cy Schubert <Cy.Schubert@cschubert.com>, Allan Jude <allanjude@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r345491 - in head/sys: conf fs/tmpfs modules/tmpfs Message-ID: <201903251917.x2PJHTnc068310@slippy.cwsent.com> In-Reply-To: Message from Ian Lepore <ian@freebsd.org> of "Mon, 25 Mar 2019 08:12:58 -0600." <3398a21318a4a6715609004d569d20de86f1dc7a.camel@freebsd.org>
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In message <3398a21318a4a6715609004d569d20de86f1dc7a.camel@freebsd.org> , Ian Le pore writes: > On Mon, 2019-03-25 at 05:42 -0700, Cy Schubert wrote: > > In message <201903250746.x2P7kKUu019786@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@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@cschubert.com> FreeBSD UNIX: <cy@FreeBSD.org> Web: http://www.FreeBSD.org The need of the many outweighs the greed of the few.
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