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freebsd_amp_hwpstate
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vm_page_queue_free_mtx is a spin mutex, not a normal sleep mutex. 

I do not know why this didn't panic my box, but I have most certainly
been using it:
peter@overcee[3:14pm]~src/sys/i386/i386-110> sysctl -a | grep zero
vm.stats.misc.zero_page_count: 2235
vm.stats.misc.cnt_prezero: 638951
vm.idlezero_enable: 1
vm.idlezero_maxrun: 16

Submitted by:	Tor.Egge@cvsup.no.freebsd.org
Approved by:	Tor's patches are never wrong. :-)
This commit is contained in:
Peter Wemm 2002-07-08 23:12:37 +00:00
parent b428c5fd23
commit 5e13bcd6c4
1 changed files with 4 additions and 4 deletions
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8
sys/vm/vm_zeroidle.c
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@ -79,18 +79,18 @@ vm_page_zero_idle(void)
vm_page_t m;
mtx_lock(&Giant);
mtx_lock(&vm_page_queue_free_mtx);
mtx_lock_spin(&vm_page_queue_free_mtx);
zero_state = 0;
m = vm_pageq_find(PQ_FREE, free_rover, FALSE);
if (m != NULL && (m->flags & PG_ZERO) == 0) {
vm_page_queues[m->queue].lcnt--;
TAILQ_REMOVE(&vm_page_queues[m->queue].pl, m, pageq);
m->queue = PQ_NONE;
mtx_unlock(&vm_page_queue_free_mtx);
mtx_unlock_spin(&vm_page_queue_free_mtx);
mtx_unlock(&Giant);
pmap_zero_page_idle(m);
mtx_lock(&Giant);
mtx_lock(&vm_page_queue_free_mtx);
mtx_lock_spin(&vm_page_queue_free_mtx);
vm_page_flag_set(m, PG_ZERO);
m->queue = PQ_FREE + m->pc;
vm_page_queues[m->queue].lcnt++;
@ -102,7 +102,7 @@ vm_page_zero_idle(void)
zero_state = 1;
}
free_rover = (free_rover + PQ_PRIME2) & PQ_L2_MASK;
mtx_unlock(&vm_page_queue_free_mtx);
mtx_unlock_spin(&vm_page_queue_free_mtx);
mtx_unlock(&Giant);
return 1;
}