KVM: s390: Improve pgste accesses
There is no need to use interlocked updates when the rcp lock is held. Therefore the simple bitops variants can be used. This should improve performance. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Carsten Otte <cotte@de.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
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@ -553,12 +553,12 @@ static inline void ptep_rcp_copy(pte_t *ptep)
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skey = page_get_storage_key(page_to_phys(page));
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skey = page_get_storage_key(page_to_phys(page));
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if (skey & _PAGE_CHANGED)
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if (skey & _PAGE_CHANGED)
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set_bit(RCP_GC_BIT, pgste);
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set_bit_simple(RCP_GC_BIT, pgste);
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if (skey & _PAGE_REFERENCED)
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if (skey & _PAGE_REFERENCED)
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set_bit(RCP_GR_BIT, pgste);
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set_bit_simple(RCP_GR_BIT, pgste);
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if (test_and_clear_bit(RCP_HC_BIT, pgste))
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if (test_and_clear_bit_simple(RCP_HC_BIT, pgste))
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SetPageDirty(page);
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SetPageDirty(page);
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if (test_and_clear_bit(RCP_HR_BIT, pgste))
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if (test_and_clear_bit_simple(RCP_HR_BIT, pgste))
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SetPageReferenced(page);
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SetPageReferenced(page);
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#endif
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#endif
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}
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}
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@ -732,8 +732,8 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
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young = ((page_get_storage_key(physpage) & _PAGE_REFERENCED) != 0);
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young = ((page_get_storage_key(physpage) & _PAGE_REFERENCED) != 0);
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rcp_lock(ptep);
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rcp_lock(ptep);
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if (young)
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if (young)
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set_bit(RCP_GR_BIT, pgste);
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set_bit_simple(RCP_GR_BIT, pgste);
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young |= test_and_clear_bit(RCP_HR_BIT, pgste);
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young |= test_and_clear_bit_simple(RCP_HR_BIT, pgste);
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rcp_unlock(ptep);
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rcp_unlock(ptep);
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return young;
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return young;
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#endif
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#endif
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