svn commit: r347695 - in head/sys: amd64/amd64 amd64/include kern

[Dmitry Chagin]

сб, 18 мая 2019 г. в 11:44, Konstantin Belousov <kostikbel at gmail.com>:

> On Sat, May 18, 2019 at 11:35:29AM +0300, Dmitry Chagin wrote:
> > чт, 16 мая 2019 г. в 16:29, Konstantin Belousov <kib at 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 ?
>


I use pkg, but after your mail, yes, compiled drm-current-kmod

root at mordor:~ # kldstat
Id Refs Address                Size Name
 1    4 0xffffffff80200000  1d536e0 kernel
 2    1 0xffffffff81f54000     11e8 acpi_call.ko
root at 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 at mordor:~

so, I'll ping freebsd-x11