Re: [PATCH v2 4/5] KVM: selftests: Add a test for KVM_RUN+rseq to detect task migration bugs
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: 2021-08-28 00:06:36
Also in:
kvm, linux-kselftest, linux-mips, linux-s390, linuxppc-dev, lkml
----- On Aug 27, 2021, at 7:23 PM, Sean Christopherson seanjc@google.com wrote:
On Fri, Aug 27, 2021, Mathieu Desnoyers wrote:
[...]
quoted
Does it reproduce if we randomize the delay to have it picked randomly from 0us to 100us (with 1us step) ? It would remove a lot of the needs for arch-specific magic delay value.My less-than-scientific testing shows that it can reproduce at delays up to ~500us, but above ~10us the reproducibility starts to drop. The bug still reproduces reliably, it just takes more iterations, and obviously the test runs a bit slower. Any objection to using a 1-10us delay, e.g. a simple usleep((i % 10) + 1)?
Works for me, thanks! Mathieu -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel