SMR question

[Amit Kulkarni]

Hi,
Is the purpose of smr_grace_wait() to round robin the curproc through
all CPUs, to make sure all CPUs have passed the quiescent state? Is
this line of thinking correct or flawed?

I was preparing a diff and wanted to know if it is safe to disable the
SMR kthread by commenting it out for testing purposes on amd64. Just a
simple yes/no would do!

Thanks

/*
 * Block until all CPUs have crossed quiescent state.
 */
void
smr_grace_wait(void)
{
#ifdef MULTIPROCESSOR
    CPU_INFO_ITERATOR cii;
    struct cpu_info *ci, *ci_start;

    ci_start = curcpu();
    CPU_INFO_FOREACH(cii, ci) {
        if (ci == ci_start)
            continue;
        sched_peg_curproc(ci);
    }
    atomic_clearbits_int(&curproc->p_flag, P_CPUPEG);
#endif /* MULTIPROCESSOR */
}