dp_config_rwlock.xd

#!/usr/sbin/dtrace -s

#pragma D option quiet
#pragma D option nspec=1000

dsl_pool_config_enter:return
{
	self->enter = timestamp;
	self->spec = speculation();
}

sched:::off-cpu
/self->enter/
{
	self->sleeptime = timestamp;
}

sched:::on-cpu
/self->sleeptime/
{
	this->ms = (timestamp - self->sleeptime) / 1000 / 1000;
	if (this->ms > 50) {
		speculate(self->spec);
		stack();
		printf("%d\n\n", this->ms);
	}
	self->sleeptime = 0;
}

dsl_pool_config_exit:entry
/self->enter/
{
	this->ms = (timestamp - self->enter) / 1000 / 1000;
	if (this->ms > 1000) {
		printf("%Y held config lock for %ums from:\n",
		    walltimestamp, this->ms);
		stack();
		printf("slept from:\n");
		if (1)
			commit(self->spec);
	} else {
		discard(self->spec);
	}
	self->enter = 0;
}