From: Heiko Carstens Date: Fri, 4 Apr 2008 14:03:34 +0000 (+0200) Subject: KVM: s390: Improve pgste accesses X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c71799c1f404c6e4f34fa64e6be39cd6149e5019;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git 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 Signed-off-by: Carsten Otte Signed-off-by: Avi Kivity --- diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h index 7fe5c4b6d82d..4c0698c0dda5 100644 --- a/include/asm-s390/pgtable.h +++ b/include/asm-s390/pgtable.h @@ -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