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trace: Fix dynamic event state on vCPU hot-unplug

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We need to disable per-vCPU events on a vCPU that is hot-unplugged to
keep the dynamic event state global counters consistent.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Message-id: 148278748055.1404.1570530281528619895.stgit@fimbulvetr.bsc.es
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Lluís Vilanova 2016-12-26 22:24:40 +01:00 committed by Stefan Hajnoczi
parent fff895dfdb
commit 82e95ec847
3 changed files with 26 additions and 0 deletions
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2
qom/cpu.c
View File

@ -348,6 +348,8 @@ static void cpu_common_realizefn(DeviceState *dev, Error **errp)
static void cpu_common_unrealizefn(DeviceState *dev, Error **errp)
{
CPUState *cpu = CPU(dev);
/* NOTE: latest generic point before the cpu is fully unrealized */
trace_fini_vcpu(cpu);
cpu_exec_unrealizefn(cpu);
}

16
trace/control.c
View File

@ -259,6 +259,22 @@ void trace_init_file(const char *file)
#endif
}
void trace_fini_vcpu(CPUState *vcpu)
{
TraceEventIter iter;
TraceEvent *ev;
trace_event_iter_init(&iter, NULL);
while ((ev = trace_event_iter_next(&iter)) != NULL) {
if (trace_event_is_vcpu(ev) &&
trace_event_get_state_static(ev) &&
trace_event_get_vcpu_state_dynamic(vcpu, ev)) {
/* must disable to affect the global counter */
trace_event_set_vcpu_state_dynamic(vcpu, ev, false);
}
}
}
bool trace_init_backends(void)
{
#ifdef CONFIG_TRACE_SIMPLE

8
trace/control.h
View File

@ -201,6 +201,14 @@ void trace_init_file(const char *file);
*/
void trace_init_vcpu(CPUState *vcpu);
/**
* trace_fini_vcpu:
* @vcpu: Removed vCPU.
*
* Disable dynamic event state for a hot-unplugged vCPU.
*/
void trace_fini_vcpu(CPUState *vcpu);
/**
* trace_list_events:
*