Date: Mon, 25 Mar 2019 08:12:58 -0600 From: Ian Lepore <ian@freebsd.org> To: Cy Schubert <Cy.Schubert@cschubert.com>, Allan Jude <allanjude@FreeBSD.org> Cc: 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: <3398a21318a4a6715609004d569d20de86f1dc7a.camel@freebsd.org> In-Reply-To: <201903251242.x2PCgre6051543@slippy.cwsent.com> References: <201903251242.x2PCgre6051543@slippy.cwsent.com>
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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. -- Ian
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