https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223059
Bug ID: 223059
Summary: [patch] consider skipped 2 pages in sw_nblks and add
size check before blist_alloc
Product: Base System
Version: 11.0-STABLE
Hardware: Any
OS: Any
Status: New
Keywords: patch
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Keywords: patch
Created attachment 187229
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=187229&action=edit
sw_nblks offset by 2
As also noted in the patch,
swaponsomething() skips the first 2 pages.
Subtract these 2 pages from sw_nblcks as well as from swap_pager_avail and
swap_total to keep track the correct numbers.
Given sw_used and sw_nblcks now keeps track of correct pages,
we can use these to check remaining pages blist_alloc().
This improves situation where some of swap devices are filled.
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