Elide the vm_reserv_free_page() call when PG_PCPU_CACHE is set.
Pages with PG_PCPU_CACHE set cannot have been allocated from a reservation, so as an optimization, skip the call to vm_reserv_free_page() in this case. Otherwise, the access of the corresponding reservation structure often results in a cache miss. Reviewed by: alc, kib Discussed with: jeff MFC after: 2 weeks Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20859
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=349841
@ -3491,7 +3491,12 @@ vm_page_free_prep(vm_page_t m)
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pmap_page_set_memattr(m, VM_MEMATTR_DEFAULT);
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#if VM_NRESERVLEVEL > 0
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if (vm_reserv_free_page(m))
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/*
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* Determine whether the page belongs to a reservation. If the page was
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* allocated from a per-CPU cache, it cannot belong to a reservation, so
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* as an optimization, we avoid the check in that case.
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*/
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if ((m->flags & PG_PCPU_CACHE) == 0 && vm_reserv_free_page(m))
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return (false);
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#endif
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