From owner-svn-src-all@freebsd.org Wed Mar 27 08:44:48 2019 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 5859D15481F3; Wed, 27 Mar 2019 08:44:48 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [IPv6:2a01:4f8:d12:604::2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 6DA456BA5D; Wed, 27 Mar 2019 08:44:47 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (eg.sd.rdtc.ru [IPv6:2a03:3100:c:13:0:0:0:5]) by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id x2R8iZJM039865 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 27 Mar 2019 09:44:36 +0100 (CET) (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: ian@freebsd.org Received: from [10.58.0.4] ([10.58.0.4]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id x2R8iZBk071780 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Wed, 27 Mar 2019 15:44:35 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: svn commit: r345491 - in head/sys: conf fs/tmpfs modules/tmpfs To: Ian Lepore , Cy Schubert , Allan Jude References: <201903251242.x2PCgre6051543@slippy.cwsent.com> <3398a21318a4a6715609004d569d20de86f1dc7a.camel@freebsd.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org From: Eugene Grosbein Message-ID: <0ad7cbbb-0037-8f40-cd74-11514a9e2201@grosbein.net> Date: Wed, 27 Mar 2019 15:44:29 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <3398a21318a4a6715609004d569d20de86f1dc7a.camel@freebsd.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=0.3 required=5.0 tests=BAYES_00,LOCAL_FROM,SPF_PASS autolearn=no autolearn_force=no version=3.4.2 X-Spam-Report: * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * -0.0 SPF_PASS SPF: sender matches SPF record * 2.6 LOCAL_FROM From my domains X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on hz.grosbein.net X-Rspamd-Queue-Id: 6DA456BA5D X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; spf=permerror (mx1.freebsd.org: domain of eugen@grosbein.net uses mechanism not recognized by this client) smtp.mailfrom=eugen@grosbein.net X-Spamd-Result: default: False [-3.60 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.99)[-0.990,0]; MX_INVALID(0.50)[cached]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[grosbein.net]; RCPT_COUNT_FIVE(0.00)[6]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; R_SPF_PERMFAIL(0.00)[]; NEURAL_HAM_SHORT(-0.89)[-0.886,0]; IP_SCORE(-1.13)[ip: (-1.56), ipnet: 2a01:4f8::/29(-2.11), asn: 24940(-1.97), country: DE(-0.01)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:24940, ipnet:2a01:4f8::/29, country:DE]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[] X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 27 Mar 2019 08:44:48 -0000 25.03.2019 21:12, Ian Lepore wrote: > 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 >>> 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. Despite of absense of loader(8), such system still can use our device.hints(5) compiled in-kernel. For example, geom_map(4) is useful for embedded systems booted with U-Boot and geom_map uses hints extensively.