Bug 15420
| Summary: | 3.3-RELEASE Kernel freeze | ||||||
|---|---|---|---|---|---|---|---|
| Product: | Base System | Reporter: | mitja <mitja> | ||||
| Component: | kern | Assignee: | freebsd-bugs (Nobody) <bugs> | ||||
| Status: | Closed FIXED | ||||||
| Severity: | Affects Only Me | ||||||
| Priority: | Normal | ||||||
| Version: | 3.3-RELEASE | ||||||
| Hardware: | Any | ||||||
| OS: | Any | ||||||
| Attachments: |
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In the last bug report I sent the wrong patch. Sorry for the inconvenience.
The right patch is this:
--------------------------------->8--------------------------------
--- vm_pageout.c.orig Mon Aug 30 00:42:11 1999
+++ vm_pageout.c Sun Dec 12 18:16:38 1999
@@ -1136,8 +1136,9 @@
* make sure that we have swap space -- if we are low on memory and
* swap -- then kill the biggest process.
*/
- if ((vm_swap_size == 0 || swap_pager_full) &&
- ((cnt.v_free_count + cnt.v_cache_count) < cnt.v_free_min)) {
+ if (vm_swap_size == 0 &&
+ (cnt.v_free_count + cnt.v_cache_count) < cnt.v_free_min ||
+ swap_pager_full) {
bigproc = NULL;
bigsize = 0;
for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
--------------------------------->8--------------------------------
Regards,
Mitja
After rerunning the tests with more processes (10+) I noticed that random
kernel freezes were still happening. After digging a bit around the swapper
code I came up with a third patch. My machine with this patch applied is
stable although running for three hours with 15 memory hogs.
-------------------------------->8-------------------------------------------
diff -u sys.orig/vm/vm_pageout.c sys/vm/vm_pageout.c
--- sys.orig/vm/vm_pageout.c Sun Aug 29 18:33:38 1999
+++ sys/vm/vm_pageout.c Mon Dec 13 17:20:38 1999
@@ -1136,8 +1136,9 @@
* make sure that we have swap space -- if we are low on memory and
* swap -- then kill the biggest process.
*/
- if ((vm_swap_size == 0 || swap_pager_full) &&
- ((cnt.v_free_count + cnt.v_cache_count) < cnt.v_free_min)) {
+ if (vm_swap_size == 0 &&
+ (cnt.v_free_count + cnt.v_cache_count) < cnt.v_free_min ||
+ swap_pager_full) {
bigproc = NULL;
bigsize = 0;
for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
@@ -1174,7 +1175,7 @@
bigproc->p_nice = PRIO_MIN;
resetpriority(bigproc);
wakeup(&cnt.v_free_count);
- }
+ }
}
return force_wakeup;
}
-------------------------------->8-------------------------------------------
Regards,
Mitja
Hi again, in the previous post I appended the wrong patch again.
Please forgive me, I have a lot of other things to do besides this ;)
The patch is now uuencoded.
Regards,
Distracted Mitja ;)
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end
State Changed From-To: open->closed timed out |
Kernel freezes under heavy VM load. Fix: The following kernel patch fixes the problem for me, but since this is my first FreeBSD hacking attempt, I'm not sure if it's OK. --------------------------------->8-------------------------------- How-To-Repeat: Spawn few programs that chew up all memory. The bug may not show up immediately, so run the programs few times. This script triggers the problem on two PCs I tested on: --------------------------------->8-------------------------------- #!/bin/sh cat << EOF > qq.c void main(void) { for(;;) memset(malloc(1000000), 0, 1000000); } EOF cc qq.c -o qq ./qq & ./qq & ./qq & ./qq & wait rm -f qq qq.c --------------------------------->8--------------------------------