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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>
This commit is contained in:
Heiko Carstens 2008-04-04 16:03:34 +02:00 committed by Avi Kivity
parent f603f0731f
commit c71799c1f4
1 changed files with 6 additions and 6 deletions
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12
include/asm-s390/pgtable.h
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@ -553,12 +553,12 @@ static inline void ptep_rcp_copy(pte_t *ptep)
skey = page_get_storage_key(page_to_phys(page));
if (skey & _PAGE_CHANGED)
set_bit(RCP_GC_BIT, pgste);
set_bit_simple(RCP_GC_BIT, pgste);
if (skey & _PAGE_REFERENCED)
set_bit(RCP_GR_BIT, pgste);
if (test_and_clear_bit(RCP_HC_BIT, pgste))
set_bit_simple(RCP_GR_BIT, pgste);
if (test_and_clear_bit_simple(RCP_HC_BIT, pgste))
SetPageDirty(page);
if (test_and_clear_bit(RCP_HR_BIT, pgste))
if (test_and_clear_bit_simple(RCP_HR_BIT, pgste))
SetPageReferenced(page);
#endif
}
@ -732,8 +732,8 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
young = ((page_get_storage_key(physpage) & _PAGE_REFERENCED) != 0);
rcp_lock(ptep);
if (young)
set_bit(RCP_GR_BIT, pgste);
young |= test_and_clear_bit(RCP_HR_BIT, pgste);
set_bit_simple(RCP_GR_BIT, pgste);
young |= test_and_clear_bit_simple(RCP_HR_BIT, pgste);
rcp_unlock(ptep);
return young;
#endif