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Trigger exit from cpu_exec_all on pending IO events

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Except for timer events, we currently do not leave the loop over all
VCPUs if an IO event was filed. That may cause unexpected IO latencies
under !CONFIG_IOTHREAD in SMP scenarios. Fix it by setting the global
exit_request which breaks the loop.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2011-02-01 22:15:45 +01:00 • committed by Marcelo Tosatti
parent 1745eaaa7c
commit 38145df24c
1 changed files with 1 additions and 0 deletions
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cpus.c
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@ -307,6 +307,7 @@ void qemu_notify_event(void)
if (next_cpu && env != next_cpu) {
cpu_exit(next_cpu);
}
exit_request = 1;
}
void qemu_mutex_lock_iothread(void) {}