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nonresident_rotate: avoid too long loops which can happen on some workloads.

This commit is contained in:
yamt 2008-02-07 12:27:38 +00:00
parent 46fa39e270
commit 79c62b78b6
1 changed files with 12 additions and 7 deletions
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19
sys/uvm/uvm_pdpolicy_clockpro.c
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_pdpolicy_clockpro.c,v 1.12 2008/01/18 10:48:23 yamt Exp $ */
/* $NetBSD: uvm_pdpolicy_clockpro.c,v 1.13 2008/02/07 12:27:38 yamt Exp $ */
/*-
* Copyright (c)2005, 2006 YAMAMOTO Takashi,
@ -43,7 +43,7 @@
#else /* defined(PDSIM) */
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_pdpolicy_clockpro.c,v 1.12 2008/01/18 10:48:23 yamt Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_pdpolicy_clockpro.c,v 1.13 2008/02/07 12:27:38 yamt Exp $");
#include "opt_ddb.h"
@ -440,12 +440,17 @@ nonresident_getbucket(objid_t obj, off_t idx)
static void
nonresident_rotate(struct bucket *b)
{
int cycle;
const int target = cycle_target;
const int cycle = b->cycle;
int cur;
int todo;
cycle = b->cycle;
todo = target - cycle;
if (todo >= BUCKETSIZE * 2) {
todo = (todo % BUCKETSIZE) + BUCKETSIZE;
}
cur = b->cur;
while (cycle - cycle_target < 0) {
while (todo > 0) {
if (b->pages[cur] != NONRES_COOKIE_INVAL) {
PDPOL_EVCNT_INCR(nreshandhot);
COLDTARGET_ADJ(-1);
@ -455,9 +460,9 @@ nonresident_rotate(struct bucket *b)
if (cur == BUCKETSIZE) {
cur = 0;
}
cycle++;
todo--;
}
b->cycle = cycle;
b->cycle = target;
b->cur = cur;
}