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Consider the zero-copy transmission of a page that was wired by mlock(2).

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If a copy-on-write fault occurs on the page, the new copy should inherit
a part of the original page's wire count.

Submitted by: tegge
MFC after: 1 week
This commit is contained in:
Alan Cox 2005-11-01 04:30:21 +00:00
parent 7bde374872
commit 674b706ea0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=151918
1 changed files with 2 additions and 0 deletions
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2
sys/vm/vm_page.c
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@ -1677,6 +1677,8 @@ vm_page_cowfault(vm_page_t m)
mnew->valid = VM_PAGE_BITS_ALL;
vm_page_dirty(mnew);
vm_page_flag_clear(mnew, PG_BUSY);
mnew->wire_count = m->wire_count - m->cow;
m->wire_count = m->cow;
}
}