Date: Sun, 19 May 2019 11:11:59 +0300 From: Dmitry Chagin <dchagin@freebsd.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: Dmitry Chagin <dchagin@freebsd.org>, 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: <CAC0jpUBXsxQxKqW%2BcUKF-BWyXrTrscCqo3L1oAVbPdTWtnXBNg@mail.gmail.com> In-Reply-To: <20190518084406.GX2748@kib.kiev.ua> References: <201905161328.x4GDSmMd072071@repo.freebsd.org> <CAC0jpUD8kkK01fmagYBS9Tb%2Bfz0VqjCpdv-zZqi=mGR2XT-Eiw@mail.gmail.com> <20190518084406.GX2748@kib.kiev.ua>
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=D1=81=D0=B1, 18 =D0=BC=D0=B0=D1=8F 2019 =D0=B3. =D0=B2 11:44, Konstantin B= elousov <kostikbel@gmail.com>: > On Sat, May 18, 2019 at 11:35:29AM +0300, Dmitry Chagin wrote: > > =D1=87=D1=82, 16 =D0=BC=D0=B0=D1=8F 2019 =D0=B3. =D0=B2 16:29, Konstant= in 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 ver= y > > > 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 an= d > > > generation. New thread starting DI appends itself to the end of th= e > > > 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 ? > I use pkg, but after your mail, yes, compiled drm-current-kmod root@mordor:~ # kldstat Id Refs Address Size Name 1 4 0xffffffff80200000 1d536e0 kernel 2 1 0xffffffff81f54000 11e8 acpi_call.ko root@mordor:~ # kldload i915kms sysctl_warn_reuse: can't re-use a leaf (compat.linuxkpi.debug)! drmn1: <drmn> on vgapci1 device_attach: drmn1 attach returned 19 root@mordor:~ so, I'll ping freebsd-x11
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