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When mdstart_swap() accesses a page that is already in the active queue,

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mark the page as referenced rather than calling vm_page_activate().  This
allows the page's act_count to grow beyond ACT_INIT and better reflect
its usage.  (See also r324146, which modified a function used by tmpfs,
uiomove_object_page(), to behave in the same way.)

Reviewed by:	kib, markj
MFC after:	2 weeks
This commit is contained in:
Alan Cox 2017-10-02 07:14:32 +00:00
parent 10b980e75b
commit d9ccb9a89f
1 changed files with 4 additions and 1 deletions
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5
sys/dev/md/md.c
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@ -1111,7 +1111,10 @@ mdstart_swap(struct md_s *sc, struct bio *bp)
if (m != NULL) { if (m != NULL) {
vm_page_xunbusy(m); vm_page_xunbusy(m);
vm_page_lock(m); vm_page_lock(m);
vm_page_activate(m); if (vm_page_active(m))
vm_page_reference(m);
else
vm_page_activate(m);
vm_page_unlock(m); vm_page_unlock(m);
} }