From 909177e227a00404bc8c412d1a3cb60f2b4b4262 Mon Sep 17 00:00:00 2001
From: alc <alc@FreeBSD.org>
Date: Sun, 11 Feb 2007 05:18:40 +0000
Subject: Use the free page queue mutex instead of the page queue mutex to
 synchronize sleeping and waking of the zero idle thread.

---
 sys/vm/vm_page.c     |  2 +-
 sys/vm/vm_zeroidle.c | 11 +++++------
 2 files changed, 6 insertions(+), 7 deletions(-)

(limited to 'sys/vm')

diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index 4e96e2f..a73d76d 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -486,7 +486,6 @@ vm_page_free(vm_page_t m)
 {
 	vm_page_flag_clear(m, PG_ZERO);
 	vm_page_free_toq(m);
-	vm_page_zero_idle_wakeup();
 }
 
 /*
@@ -1164,6 +1163,7 @@ vm_page_free_toq(vm_page_t m)
 		++vm_page_zero_count;
 	} else {
 		TAILQ_INSERT_HEAD(&pq->pl, m, pageq);
+		vm_page_zero_idle_wakeup();
 	}
 	vm_page_free_wakeup();
 	mtx_unlock(&vm_page_queue_free_mtx);
diff --git a/sys/vm/vm_zeroidle.c b/sys/vm/vm_zeroidle.c
index 252f8d5..5af84e0 100644
--- a/sys/vm/vm_zeroidle.c
+++ b/sys/vm/vm_zeroidle.c
@@ -103,7 +103,7 @@ vm_page_zero_idle(void)
 	static int free_rover;
 	vm_page_t m;
 
-	mtx_lock(&vm_page_queue_free_mtx);
+	mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
 	zero_state = 0;
 	m = vm_pageq_find(PQ_FREE, free_rover, FALSE);
 	if (m != NULL && (m->flags & PG_ZERO) == 0) {
@@ -119,7 +119,6 @@ vm_page_zero_idle(void)
 			zero_state = 1;
 	}
 	free_rover = (free_rover + PQ_PRIME2) & PQ_COLORMASK;
-	mtx_unlock(&vm_page_queue_free_mtx);
 }
 
 /* Called by vm_page_free to hint that a new page is available. */
@@ -127,7 +126,7 @@ void
 vm_page_zero_idle_wakeup(void)
 {
 
-	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
 	if (wakeup_needed && vm_page_zero_check()) {
 		wakeup_needed = FALSE;
 		wakeup(&zero_state);
@@ -140,6 +139,7 @@ vm_pagezero(void __unused *arg)
 
 	idlezero_enable = idlezero_enable_default;
 
+	mtx_lock(&vm_page_queue_free_mtx);
 	for (;;) {
 		if (vm_page_zero_check()) {
 			vm_page_zero_idle();
@@ -151,10 +151,9 @@ vm_pagezero(void __unused *arg)
 			}
 #endif
 		} else {
-			vm_page_lock_queues();
 			wakeup_needed = TRUE;
-			msleep(&zero_state, &vm_page_queue_mtx,
-			    PDROP, "pgzero", hz * 300);
+			msleep(&zero_state, &vm_page_queue_free_mtx, 0,
+			    "pgzero", hz * 300);
 		}
 	}
 }
-- 
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