svn commit: r306680 - in head/sys: amd64/amd64 amd64/include i386/include x86/include x86/x86

[Slawa Olhovchenkov]

On Wed, Oct 12, 2016 at 06:30:09PM +0300, Andriy Gapon wrote:

> On 12/10/2016 16:45, Konstantin Belousov wrote:
> > On Wed, Oct 12, 2016 at 04:25:00PM +0300, Andriy Gapon wrote:
> >> On 04/10/2016 20:01, Konstantin Belousov wrote:
> >>> Author: kib
> >>> Date: Tue Oct  4 17:01:24 2016
> >>> New Revision: 306680
> >>> URL: https://svnweb.freebsd.org/changeset/base/306680
> >>>
> >>> Log:
> >>>   Re-apply r306516 (by cem):
> >>>   
> >>>   Reduce the cost of TLB invalidation on x86 by using per-CPU completion flags
> >>>   
> >>>   Reduce contention during TLB invalidation operations by using a per-CPU
> >>>   completion flag, rather than a single atomically-updated variable.
> >>
> >> Kostik,
> >>
> >> could this commit cause a problem reported in the below links?
> >> https://bz-attachments.freebsd.org/attachment.cgi?id=175614
> >> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213371
> > 
> > If I am reading the report right, the problem appears on the
> > 11.0-RELEASE system. The patch you reference was only applied to HEAD a
> > week ago and was not merged even to stable/11.
> 
> Sorry for the noise, then.  Somehow I thought that this went into the release
> branch, but obviously there was too little time for that.
> 
> > The examination must start with backtracing the thread which owns the
> > smp_ipi_mtx (shown on the screenshot).
> 
> It looks like DDB is not in GENERIC in 11.0?

Yes, DDB is absent in GENERIC 11.0

> Not sure if the reporter would be able to configure a dump device and then save
> the dump given that the panic happens in the installer.
> If anyone could provide them with instructions that would be great.
> 
> -- 
> Andriy Gapon
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