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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2008-04-04 16:03:34 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-04-27 12:01:00 +0300 |
| commit | c71799c1f404c6e4f34fa64e6be39cd6149e5019 (patch) | |
| tree | cfc9b0d49e02156b0b9931363c21e957ff9caae1 /include/asm-s390 | |
| parent | f603f0731f43421403160f5f8b12e90f2e51f064 (diff) | |
| download | linux-c71799c1f404c6e4f34fa64e6be39cd6149e5019.tar.gz linux-c71799c1f404c6e4f34fa64e6be39cd6149e5019.tar.bz2 linux-c71799c1f404c6e4f34fa64e6be39cd6149e5019.zip | |
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>
Diffstat (limited to 'include/asm-s390')
| -rw-r--r-- | include/asm-s390/pgtable.h | 12 |
1 files changed, 6 insertions, 6 deletions
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 |