From: Gerald Schaefer <gerald.schaefer@de.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Andi Kleen <ak@linux.intel.com>, Hugh Dickins <hughd@google.com>,
Hillf Danton <dhillf@gmail.com>
Cc: linux-kernel@vger.kernel.org,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Gerald Schaefer <gerald.schaefer@de.ibm.com>
Subject: [RFC v2 PATCH 2/7] thp: introduce pmdp_invalidate()
Date: Wed, 29 Aug 2012 17:32:59 +0200 [thread overview]
Message-ID: <1346254384-30046-3-git-send-email-gerald.schaefer@de.ibm.com> (raw)
In-Reply-To: <1346254384-30046-1-git-send-email-gerald.schaefer@de.ibm.com>
On s390, a valid page table entry must not be changed while it is
attached to any CPU. So instead of pmd_mknotpresent() and set_pmd_at(),
an IDTE operation would be necessary there. This patch introduces the
pmdp_invalidate() function, to allow architecture-specific
implementations.
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
---
include/asm-generic/pgtable.h | 5 +++++
mm/huge_memory.c | 3 +--
mm/pgtable-generic.c | 11 +++++++++++
3 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index f756f60..47519ef 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -170,6 +170,11 @@ extern void pgtable_deposit(struct mm_struct *mm, pgtable_t pgtable);
extern pgtable_t pgtable_withdraw(struct mm_struct *mm);
#endif
+#ifndef __HAVE_ARCH_PMDP_INVALIDATE
+extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
+ pmd_t *pmdp);
+#endif
+
#ifndef __HAVE_ARCH_PTE_SAME
static inline int pte_same(pte_t pte_a, pte_t pte_b)
{
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 6805328..8bac516 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1374,8 +1374,7 @@ static int __split_huge_page_map(struct page *page,
* SMP TLB and finally we write the non-huge version
* of the pmd entry with pmd_populate.
*/
- set_pmd_at(mm, address, pmd, pmd_mknotpresent(*pmd));
- flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
+ pmdp_invalidate(vma, address, pmd);
pmd_populate(mm, pmd, pgtable);
ret = 1;
}
diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
index 308f1fb..ca01b4b 100644
--- a/mm/pgtable-generic.c
+++ b/mm/pgtable-generic.c
@@ -159,3 +159,14 @@ pgtable_t pgtable_withdraw(struct mm_struct *mm)
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif
+
+#ifndef __HAVE_ARCH_PMDP_INVALIDATE
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
+ pmd_t *pmdp)
+{
+ set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp));
+ flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+#endif
--
1.7.11.5
next prev parent reply other threads:[~2012-08-29 15:35 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-29 15:32 [RFC v2 PATCH 0/7] thp: transparent hugepages on s390 Gerald Schaefer
2012-08-29 15:32 ` [RFC v2 PATCH 1/7] thp: remove assumptions on pgtable_t type Gerald Schaefer
2012-08-31 5:29 ` Aneesh Kumar K.V
2012-08-31 7:10 ` Martin Schwidefsky
2012-09-04 22:56 ` Andrea Arcangeli
2012-09-05 17:12 ` Gerald Schaefer
2012-08-29 15:32 ` Gerald Schaefer [this message]
2012-08-29 15:33 ` [RFC v2 PATCH 3/7] thp: make MADV_HUGEPAGE check for mm->def_flags Gerald Schaefer
2012-08-29 15:33 ` [RFC v2 PATCH 4/7] thp, s390: thp splitting backend for s390 Gerald Schaefer
2012-08-29 15:33 ` [RFC v2 PATCH 5/7] thp, s390: thp pagetable pre-allocation " Gerald Schaefer
2012-08-29 15:33 ` [RFC v2 PATCH 6/7] thp, s390: disable thp for kvm host on s390 Gerald Schaefer
2012-08-29 15:33 ` [RFC v2 PATCH 7/7] thp, s390: architecture backend for thp " Gerald Schaefer
2012-08-30 19:54 ` [RFC v2 PATCH 0/7] thp: transparent hugepages " Andrew Morton
2012-08-31 7:07 ` Martin Schwidefsky
2012-08-31 19:47 ` Andrew Morton
2012-09-04 22:40 ` Andrea Arcangeli
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