From: Andrew Jones <drjones@redhat.com>
To: kvm@vger.kernel.org
Cc: pbonzini@redhat.com, rkrcmar@redhat.com
Subject: [PATCH kvm-unit-tests v2 0/2] arm/arm64: smp: on_cpu improvements
Date: Fri, 2 Jun 2017 17:31:07 +0200 [thread overview]
Message-ID: <20170602153109.2904-1-drjones@redhat.com> (raw)
After posting on_cpu() support yesterday I thought of some potential
issues.
1) cpu0 was the only cpu allowed to call on_cpus, and no cpu was
allowed to call on_cpu on cpu0 (as it'll never idle).
2) deadlocks are easy with this idle state scheduling model, but
also easy to detect, so we should.
v2:
- fix race in cpu_wait() by ordering set/check correctly
Andrew Jones (2):
arm/arm64: smp: cpu0 is special
arm/arm64: smp: add deadlock detection
lib/arm/asm/smp.h | 2 ++
lib/arm/smp.c | 46 ++++++++++++++++++++++++++++++++++++----------
2 files changed, 38 insertions(+), 10 deletions(-)
--
2.9.4
next reply other threads:[~2017-06-02 15:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-02 15:31 Andrew Jones [this message]
2017-06-02 15:31 ` [PATCH kvm-unit-tests v2 1/2] arm/arm64: smp: cpu0 is special Andrew Jones
2017-06-02 15:31 ` [PATCH kvm-unit-tests v2 2/2] arm/arm64: smp: add deadlock detection Andrew Jones
2017-06-03 8:28 ` [PATCH kvm-unit-tests v2 3/2] arm/arm64: smp: detect deadlock cycles Andrew Jones
2017-06-07 15:00 ` [PATCH kvm-unit-tests v2 0/2] arm/arm64: smp: on_cpu improvements Radim Krčmář
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