Date: Sun, 19 May 2019 22:44:13 +0200 From: Niclas Zeising <zeising@freebsd.org> To: Dmitry Chagin <dchagin@freebsd.org>, Konstantin Belousov <kostikbel@gmail.com> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers <src-committers@freebsd.org> Subject: Re: svn commit: r347695 - in head/sys: amd64/amd64 amd64/include kern Message-ID: <342813b3-e7a9-4654-3945-b0105e582ab6@freebsd.org> In-Reply-To: <CAC0jpUBXsxQxKqW%2BcUKF-BWyXrTrscCqo3L1oAVbPdTWtnXBNg@mail.gmail.com> References: <201905161328.x4GDSmMd072071@repo.freebsd.org> <CAC0jpUD8kkK01fmagYBS9Tb%2Bfz0VqjCpdv-zZqi=mGR2XT-Eiw@mail.gmail.com> <20190518084406.GX2748@kib.kiev.ua> <CAC0jpUBXsxQxKqW%2BcUKF-BWyXrTrscCqo3L1oAVbPdTWtnXBNg@mail.gmail.com>
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On 2019-05-19 10:11, Dmitry Chagin wrote: > =D1=81=D0=B1, 18 =D0=BC=D0=B0=D1=8F 2019 =D0=B3. =D0=B2 11:44, Konstant= in Belousov <kostikbel@gmail.com>: >=20 >> 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, Konsta= ntin 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 v= ery >>>> early Athlons, provide lockless implementation of delayed >>>> invalidation. >>>> >>>> The implementation maintains lock-less single-linked list with th= e >>>> 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 eleme= nt >>>> +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 ? >> >=20 >=20 > I use pkg, but after your mail, yes, compiled drm-current-kmod >=20 > 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:~ >=20 > so, I'll ping freebsd-x11 Hi! drm-current-kmod was updated to the 20190519 snapshot, can you try that?=20 If it still fails, please send a message to x11@freebsd.org . Thanks! Regards --=20 Niclas Zeising
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