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[S390] add support for nonquiescing sske

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Improve performance of the sske operation by using the nonquiescing
variant if the affected page has no mappings established. On machines
with no support for the new sske variant the mask bit will be ignored.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2010-10-25 16:10:14 +02:00
committed by Martin Schwidefsky
parent 92f842eac7
commit e2b8d7af0e
7 changed files with 18 additions and 12 deletions
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8
arch/s390/include/asm/pgtable.h
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@@ -590,7 +590,7 @@ static inline void rcp_unlock(pte_t *ptep)
}
/* forward declaration for SetPageUptodate in page-flags.h*/
static inline void page_clear_dirty(struct page *page);
static inline void page_clear_dirty(struct page *page, int mapped);
#include <linux/page-flags.h>
static inline void ptep_rcp_copy(pte_t *ptep)
@@ -800,7 +800,7 @@ static inline int kvm_s390_test_and_clear_page_dirty(struct mm_struct *mm,
}
dirty = test_and_clear_bit_simple(KVM_UD_BIT, pgste);
if (skey & _PAGE_CHANGED)
page_clear_dirty(page);
page_clear_dirty(page, 1);
rcp_unlock(ptep);
return dirty;
}
@@ -975,9 +975,9 @@ static inline int page_test_dirty(struct page *page)
}
#define __HAVE_ARCH_PAGE_CLEAR_DIRTY
static inline void page_clear_dirty(struct page *page)
static inline void page_clear_dirty(struct page *page, int mapped)
{
page_set_storage_key(page_to_phys(page), PAGE_DEFAULT_KEY);
page_set_storage_key(page_to_phys(page), PAGE_DEFAULT_KEY, mapped);
}
/*