d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

If we seem to be out of VM, don't allow the pagedaemon to kill

Browse Source 
processes in the first pass.  Among other things, this will give
us a chance to launder vnode-backed pages before concluding that
we need more swap.  This is particularly useful for systems that
have no swap.

While here, update a comment and remove some long-unused code.

Reported by:	Lucky Green <shamrock@cypherpunks.to>
Suggested by:	dillon
Approved by:	re (rwatson)
This commit is contained in:
das 2003-05-19 00:51:07 +00:00
parent 81cba5c034
commit c901b56d8d
1 changed files with 8 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
sys/vm/vm_pageout.c
View File

@ -1162,8 +1162,11 @@ vm_pageout_scan(int pass)
}
/*
* If we are out of swap and were not able to reach our paging
* target, kill the largest process.
* If we are critically low on one of RAM or swap and low on
* the other, kill the largest process. However, we avoid
* doing this on the first pass in order to give ourselves a
* chance to flush out dirty vnode-backed pages and to allow
* active pages to be moved to the inactive queue and reclaimed.
*
* We keep the process bigproc locked once we find it to keep anyone
* from messing with it; however, there is a possibility of
@ -1172,11 +1175,9 @@ vm_pageout_scan(int pass)
* lock while walking this list. To avoid this, we don't block on
* the process lock but just skip a process if it is already locked.
*/
if ((vm_swap_size < 64 && vm_page_count_min()) ||
(swap_pager_full && vm_paging_target() > 0)) {
#if 0
if ((vm_swap_size < 64 || swap_pager_full) && vm_page_count_min()) {
#endif
if (pass != 0 &&
((vm_swap_size < 64 && vm_page_count_min()) ||
(swap_pager_full && vm_paging_target() > 0))) {
bigproc = NULL;
bigsize = 0;
sx_slock(&allproc_lock);