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s390/pgtable: skip pgste updates on full flush

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On process exit there is no more need for the pgste information.
Skip the expensive storage key operations which should speed up
termination of KVM processes.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2013-07-19 10:31:55 +02:00
parent e509861105
commit a055f66a3a
1 changed files with 3 additions and 4 deletions
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7
arch/s390/include/asm/pgtable.h
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@ -1144,10 +1144,9 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
pgste_t pgste;
pte_t pte;
if (mm_has_pgste(mm)) {
if (!full && mm_has_pgste(mm)) {
pgste = pgste_get_lock(ptep);
if (!full)
pgste = pgste_ipte_notify(mm, address, ptep, pgste);
pgste = pgste_ipte_notify(mm, address, ptep, pgste);
}
pte = *ptep;
@ -1155,7 +1154,7 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
__ptep_ipte(address, ptep);
pte_val(*ptep) = _PAGE_INVALID;
if (mm_has_pgste(mm)) {
if (!full && mm_has_pgste(mm)) {
pgste = pgste_update_all(&pte, pgste);
pgste_set_unlock(ptep, pgste);
}