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At the most recent Xen Summit, Thomas Friebel presented a paper ("Preventing Guests from Spinning Around", http://xen.org/files/xensummitboston08/LHP.pdf) investigating the interactions between spinlocks and virtual machines. Specifically, he looked at what happens when a lock-holding VCPU gets involuntarily preempted. The obvious first order effect is that while the VCPU is not

At the most recent Xen Summit, Thomas Friebel presented a paper ("Preventing Guests from Spinning Around", http://xen.org/files/xensummitboston08/LHP.pdf) investigating the interactions between spinlocks and virtual machines. Specifically, he looked at what happens when a lock-holding VCPU gets involuntarily preempted. The obvious first order effect is that while the VCPU is not

At the most recent Xen Summit, Thomas Friebel presented a paper ("Preventing Guests from Spinning Around", http://xen.org/files/xensummitboston08/LHP.pdf) investigating the interactions between spinlocks and virtual machines. Specifically, he looked at what happens when a lock-holding VCPU gets involuntarily preempted. The obvious first order effect is that while the VCPU is not

...ds [ 1.273507] audit: initializing netlink socket (disabled) [ 1.278929] type=2000 audit(1249306819.370:1): initialized [ 1.293287] Testing tracer sched_switch: PASSED [ 1.396782] Testing tracer sysprof: PASSED [ 1.504844] Testing tracer function: PASSED [ 1.617431] Testing tracer irqsoff: PASSED [ 1.621818] Testing tracer wakeup: PASSED [ 1.936759] Testing tracer wakeup_rt: PASSED [ 2.248770] Testing tracer function_graph: <3>BUG: scheduling while atomic: swapper/1/0xdf803480 [ 2.253478] BUG: unable to handle kernel paging request at 3e87ab40 [ 2.253478] IP: [&...