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trace: Immediately apply per-vCPU state changes if a vCPU is being created

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Right now, function trace_event_set_vcpu_state_dynamic() asynchronously enables
events in the case a vCPU is executing TCG code. If the vCPU is being created
this makes some events like "guest_cpu_enter" to not be traced.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Reviewed-by: Emilio G. Cota <cota@braap.org>
Message-id: 150525662577.19850.13767570977540117247.stgit@frigg.lan
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Lluís Vilanova 2017-09-13 01:50:25 +03:00 committed by Stefan Hajnoczi
parent 3dabde1128
commit f99b38fc7c
1 changed files with 11 additions and 7 deletions
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18
trace/control-target.c
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@ -88,13 +88,17 @@ void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
clear_bit(vcpu_id, vcpu->trace_dstate_delayed);
(*ev->dstate)--;
}
/*
* Delay changes until next TB; we want all TBs to be built from a
* single set of dstate values to ensure consistency of generated
* tracing code.
*/
async_run_on_cpu(vcpu, trace_event_synchronize_vcpu_state_dynamic,
RUN_ON_CPU_NULL);
if (vcpu->created) {
/*
* Delay changes until next TB; we want all TBs to be built from a
* single set of dstate values to ensure consistency of generated
* tracing code.
*/
async_run_on_cpu(vcpu, trace_event_synchronize_vcpu_state_dynamic,
RUN_ON_CPU_NULL);
} else {
trace_event_synchronize_vcpu_state_dynamic(vcpu, RUN_ON_CPU_NULL);
}
}
}