From owner-freebsd-hackers@freebsd.org Tue Nov 6 02:05:00 2018 Return-Path: Delivered-To: freebsd-hackers@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 F25F01128F15 for ; Tue, 6 Nov 2018 02:04:59 +0000 (UTC) (envelope-from rwmaillists@googlemail.com) Received: from mail-wr1-x42c.google.com (mail-wr1-x42c.google.com [IPv6:2a00:1450:4864:20::42c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 192F084CA9 for ; Tue, 6 Nov 2018 02:04:59 +0000 (UTC) (envelope-from rwmaillists@googlemail.com) Received: by mail-wr1-x42c.google.com with SMTP id y15-v6so11663941wru.9 for ; Mon, 05 Nov 2018 18:04:59 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:subject:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=2VwX7TAoUYMVeaYl+8btEEeLy1FYSPsxpSfgcnh5fwY=; b=jcmE8XP5cs4iKwJ5LTZ2RsDvTGcsuzJHNNZUaQDYS4zkml46xuBFLU2xTnld1uzxW5 hMIZlamvx4RcdRVVggAFsnxNJLo/Maxp/UOuUgZ0Y5T3dGM7dg1ZP59MtA8q9ynjUUfN g6pE+lMhCtZbNAuLTQ9GEx893RfdtGrjQmecT13h+G4BqLZyOeSw2QKEhBPvwoDMGkxq ZX/VT2HG05sVqC4idNEdGhexVkF5KtQzu/4Lo+xcaYaJzK9OgMmXn3Hrukszp5M3X/GL P++WeXYoC11P3jyJjsZ7CvXlXSUB820f9iJWQuCYffS/nMkJdoXXptZj7WWjx3O84JB6 hpFg== X-Gm-Message-State: AGRZ1gKvHnBuQQuplG+VoGdSVWKvhpLtvkHw+U8w16DeUl4MKIIh1LpL xz53CeOD7MlP2B3nf/adJBnl4IeSEN4= X-Google-Smtp-Source: AJdET5cQ2WJjEIj+GVgI0ofm2tYvoLH8anKn7raqymaksuZLE/rmj4qtBhyIQXnodlTuFxqdMps+QQ== X-Received: by 2002:a5d:46ce:: with SMTP id g14-v6mr21166373wrs.263.1541469897690; Mon, 05 Nov 2018 18:04:57 -0800 (PST) Received: from gumby.homeunix.com ([2.121.229.57]) by smtp.gmail.com with ESMTPSA id l9-v6sm328308wme.36.2018.11.05.18.04.56 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 05 Nov 2018 18:04:57 -0800 (PST) Date: Tue, 6 Nov 2018 02:04:54 +0000 From: RW To: freebsd-hackers@freebsd.org Subject: Re: Sudden grow of memory in "Laundry" state Message-ID: <20181106020454.1200f69c@gumby.homeunix.com> In-Reply-To: <3F9246AC-0CBA-4C73-A39E-A1F6149BA079@yahoo.com> References: <20180911150849.GD92634@raichu> <104be96a-c16b-7e7c-7d0d-00338ab5a106@gmail.com> <20180928152550.GA3609@raichu> <20181024211237.302b72d9@gmail.com> <981C887D-78EB-46D2-AEE5-877E269AF066@yahoo.com> <42f6544f-830c-18c5-e1a8-0acc4c3f09cc@gmail.com> <20181027043819.GX5335@kib.kiev.ua> <20181106012107.2898f093@gmail.com> <20181106005347.2f035e34@gumby.homeunix.com> <3F9246AC-0CBA-4C73-A39E-A1F6149BA079@yahoo.com> X-Mailer: Claws Mail 3.16.0 (GTK+ 2.24.32; amd64-portbld-freebsd11.1) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 192F084CA9 X-Spamd-Result: default: False [-4.61 / 200.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_DKIM_ALLOW(-0.20)[googlemail.com]; NEURAL_HAM_MEDIUM(-1.00)[-0.998,0]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; FREEMAIL_FROM(0.00)[googlemail.com]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; TO_DN_NONE(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-0.997,0]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_TRACE(0.00)[googlemail.com:+]; MX_GOOD(-0.01)[cached: alt3.gmail-smtp-in.l.google.com]; DMARC_POLICY_ALLOW(-0.50)[googlemail.com,quarantine]; RCVD_IN_DNSWL_NONE(0.00)[c.2.4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0]; NEURAL_HAM_SHORT(-0.92)[-0.919,0]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_LAST(0.00)[]; FREEMAIL_ENVFROM(0.00)[googlemail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; IP_SCORE(-0.68)[ipnet: 2a00:1450::/32(-1.97), asn: 15169(-1.36), country: US(-0.07)]; RECEIVED_SPAMHAUS_PBL(0.00)[57.229.121.2.zen.spamhaus.org : 127.0.0.10] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Nov 2018 02:05:00 -0000 On Mon, 5 Nov 2018 17:30:42 -0800 Mark Millard wrote: > On 2018-Nov-5, at 16:53, RW via freebsd-hackers freebsd.org> wrote: > > >> Unfortunately, the wording of this message is a misnomer for what > >> drives the kills: it is actually driven by being unable to gain > >> more free memory but FreeBSD will not swap-out processes that stay > >> runnable (or are running), only ones that are waiting. > > > > When you say it wont swap-out processes, do you mean that > > literally, or do you mean it wont page-out from runable processes? > > Swapping processes shouldn't be an essential part of recovering > > memory, Linux doesn't even support it. > > Paging is a different issue as I understand. Without paging, > no process could have a memory area bigger than RAM. Modern VM manages memory at the page level, and paging replaced true process swapping a long time ago. In FreeBSD a form of swapping was recreated on top of paging. Under low memory conditions the recovery of memory from whole processes is accelerated allowing more memory into the running/runable processes. This is a relatively minor tweak to ordinary paging - AFAIK it shouldn't prevent normal memory management at the page level.