Date: Wed, 12 Oct 2016 16:45:50 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Andriy Gapon <avg@FreeBSD.org> Cc: src-committers@FreeBSD.org, svn-src-all@FreeBSD.org, svn-src-head@FreeBSD.org Subject: Re: svn commit: r306680 - in head/sys: amd64/amd64 amd64/include i386/include x86/include x86/x86 Message-ID: <20161012134550.GX68202@kib.kiev.ua> In-Reply-To: <425655dd-ba13-8944-0f31-b1ad6666d90a@FreeBSD.org> References: <201610041701.u94H1OK3061119@repo.freebsd.org> <425655dd-ba13-8944-0f31-b1ad6666d90a@FreeBSD.org>
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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. The examination must start with backtracing the thread which owns the smp_ipi_mtx (shown on the screenshot).
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