Date: Sat, 18 May 2019 11:44:06 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Dmitry Chagin <dchagin@freebsd.org> Cc: src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r347695 - in head/sys: amd64/amd64 amd64/include kern Message-ID: <20190518084406.GX2748@kib.kiev.ua> In-Reply-To: <CAC0jpUD8kkK01fmagYBS9Tb%2Bfz0VqjCpdv-zZqi=mGR2XT-Eiw@mail.gmail.com> References: <201905161328.x4GDSmMd072071@repo.freebsd.org> <CAC0jpUD8kkK01fmagYBS9Tb%2Bfz0VqjCpdv-zZqi=mGR2XT-Eiw@mail.gmail.com>
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On Sat, May 18, 2019 at 11:35:29AM +0300, Dmitry Chagin wrote: > чт, 16 мая 2019 г. в 16:29, Konstantin Belousov <kib@freebsd.org>: > > > Author: kib > > Date: Thu May 16 13:28:48 2019 > > New Revision: 347695 > > URL: https://svnweb.freebsd.org/changeset/base/347695 > > > > Log: > > amd64 pmap: rework delayed invalidation, removing global mutex. > > > > For machines having cmpxcgh16b instruction, i.e. everything but very > > early Athlons, provide lockless implementation of delayed > > invalidation. > > > > The implementation maintains lock-less single-linked list with the > > trick from the T.L. Harris article about volatile mark of the elements > > being removed. Double-CAS is used to atomically update both link and > > generation. New thread starting DI appends itself to the end of the > > queue, setting the generation to the generation of the last element > > +1. On DI finish, thread donates its generation to the previous > > element. The generation of the fake head of the list is the last > > passed DI generation. Basically, the implementation is a queued > > spinlock but without spinlock. > > > > > > Hi, Kostik! First of all thanks for the previous help. > Second, this commit broke i915kms module. Unfortunatelly, > I can't give you a lot of information becouse I see only black screen, > but I can help with testing Did you recompiled the module ?
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