svn commit: r194123 - head/sys/powerpc/booke

[Alan Cox]

Author: alc
Date: Sat Jun 13 18:35:29 2009
New Revision: 194123
URL: http://svn.freebsd.org/changeset/base/194123

Log:
  Correct the method of waking the page daemon when the number of allocated
  pv entries surpasses the high water mark.  The problem was that the page
  daemon would only be awakened the first time that the high water mark was
  surpassed.  (The variable "pagedaemon_waken" is a non-working vestige of
  FreeBSD 4.x, in which it was external and reset by the page daemon whenever
  it ran.  This reset allowed subsequent wakeups by the pv entry allocator.)

Modified:
  head/sys/powerpc/booke/pmap.c

Modified: head/sys/powerpc/booke/pmap.c
==============================================================================
--- head/sys/powerpc/booke/pmap.c	Sat Jun 13 17:09:31 2009	(r194122)
+++ head/sys/powerpc/booke/pmap.c	Sat Jun 13 18:35:29 2009	(r194123)
@@ -156,8 +156,6 @@ static void mmu_booke_enter_locked(mmu_t
 unsigned int kptbl_min;		/* Index of the first kernel ptbl. */
 unsigned int kernel_ptbls;	/* Number of KVA ptbls. */
 
-static int pagedaemon_waken;
-
 /*
  * If user pmap is processed with mmu_booke_remove and the resident count
  * drops to 0, there are no more pages to remove, so we need not continue.
@@ -712,11 +710,8 @@ pv_alloc(void)
 	pv_entry_t pv;
 
 	pv_entry_count++;
-	if ((pv_entry_count > pv_entry_high_water) &&
-	    (pagedaemon_waken == 0)) {
-		pagedaemon_waken = 1;
-		wakeup(&vm_pages_needed);
-	}
+	if (pv_entry_count > pv_entry_high_water)
+		pagedaemon_wakeup();
 	pv = uma_zalloc(pvzone, M_NOWAIT);
 
 	return (pv);