svn commit: r303820 - user/alc/PQ_LAUNDRY/sys/vm
Alan Cox
alc at FreeBSD.org
Mon Aug 8 01:01:06 UTC 2016
Author: alc
Date: Mon Aug 8 01:01:05 2016
New Revision: 303820
URL: https://svnweb.freebsd.org/changeset/base/303820
Log:
Avoid division by zero without putting a stop to laundering.
Discussed with: markj
Modified:
user/alc/PQ_LAUNDRY/sys/vm/vm_pageout.c
Modified: user/alc/PQ_LAUNDRY/sys/vm/vm_pageout.c
==============================================================================
--- user/alc/PQ_LAUNDRY/sys/vm/vm_pageout.c Sun Aug 7 23:04:46 2016 (r303819)
+++ user/alc/PQ_LAUNDRY/sys/vm/vm_pageout.c Mon Aug 8 01:01:05 2016 (r303820)
@@ -1130,7 +1130,7 @@ vm_pageout_laundry_worker(void *arg)
ninact = vm_cnt.v_inactive_count;
nlaundry = vm_cnt.v_laundry_count;
wakeups = VM_METER_PCPU_CNT(v_pdwakeups);
- if (target == 0 && ninact > 0 && wakeups != gen &&
+ if (target == 0 && wakeups != gen &&
nlaundry * bkgrd_launder_ratio >= ninact) {
gen = wakeups;
@@ -1152,6 +1152,8 @@ vm_pageout_laundry_worker(void *arg)
*/
target = vm_cnt.v_free_target -
vm_pageout_wakeup_thresh;
+ if (ninact == 0)
+ ninact = 1;
target = nlaundry * (u_int)target / ninact / 10;
if (target == 0)
target = 1;
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