Author: markj
Date: Sat Jul 27 16:33:34 2019
New Revision: 350375
URL: https://svnweb.freebsd.org/changeset/base/350375
Log:
MFC r349841:
Elide the vm_reserv_free_page() call when PG_PCPU_CACHE is set.
Modified:
stable/12/sys/vm/vm_page.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/vm/vm_page.c
==============================================================================
--- stable/12/sys/vm/vm_page.c Sat Jul 27 16:33:11 2019 (r350374)
+++ stable/12/sys/vm/vm_page.c Sat Jul 27 16:33:34 2019 (r350375)
@@ -3461,7 +3461,12 @@ vm_page_free_prep(vm_page_t m)
pmap_page_set_memattr(m, VM_MEMATTR_DEFAULT);
#if VM_NRESERVLEVEL > 0
- if (vm_reserv_free_page(m))
+ /*
+ * Determine whether the page belongs to a reservation. If the page was
+ * allocated from a per-CPU cache, it cannot belong to a reservation, so
+ * as an optimization, we avoid the check in that case.
+ */
+ if ((m->flags & PG_PCPU_CACHE) == 0 && vm_reserv_free_page(m))
return (false);
#endif
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