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authorPaolo Bonzini <pbonzini@redhat.com>2016-08-31 21:33:58 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2016-09-27 11:57:30 +0200
commitc265e976f4669fd65f5b47e6865f50d1cb66bd02 (patch)
treeb80f5c8500bd6ad92ee0474bce2b4186dd2540c5 /tcg
parent3359baad36889b83df40b637ed993a4b816c4906 (diff)
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cpus-common: lock-free fast path for cpu_exec_start/end
Set cpu->running without taking the cpu_list lock, only requiring it if there is a concurrent exclusive section. This requires adding a new field to CPUState, which records whether a running CPU is being counted in pending_cpus. When an exclusive section is started concurrently with cpu_exec_start, cpu_exec_start can use the new field to determine if it has to wait for the end of the exclusive section. Likewise, cpu_exec_end can use it to see if start_exclusive is waiting for that CPU. This a separate patch for easier bisection of issues. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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