Date: Wed, 25 Jun 2014 13:58:29 +0200 From: Attilio Rao <attilio@freebsd.org> To: =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= <royger@freebsd.org>, Alan Cox <alc@freebsd.org> Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org> Subject: Re: svn commit: r267858 - in head/sys/dev: virtio/balloon xen/balloon Message-ID: <CAJ-FndD4M8QkejyTv4R_9qoThqvFinYbHP4YSby6mQS9EKSYPA@mail.gmail.com> In-Reply-To: <201406250951.s5P9p8YR017159@svn.freebsd.org> References: <201406250951.s5P9p8YR017159@svn.freebsd.org>
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On Wed, Jun 25, 2014 at 11:51 AM, Roger Pau Monn=C3=A9 <royger@freebsd.org>= wrote: > Author: royger > Date: Wed Jun 25 09:51:08 2014 > New Revision: 267858 > URL: http://svnweb.freebsd.org/changeset/base/267858 > > Log: > xen/virtio: fix balloon drivers to not mark pages as WIRED > > Prevent the Xen and VirtIO balloon drivers from marking pages as > wired. This prevents them from increasing the system wired page count, > which can lead to mlock failing because of hitting the limit in > vm.max_wired. This change is conceptually wrong. The pages balloon is allocating are unmanaged and they should be wired by definition. Alan and I are considering enforcing this (mandatory wired pages for unmanaged pages allocation) directly in the KPI. This in practice just seem an artifact to deal with scarce wired memory limit. I suggest that for the XEN case this limit gets bumped rather relying on similar type of hacks. Attilio --=20 Peace can only be achieved by understanding - A. Einstein
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