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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2016-12-12 16:42:40 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 18:55:07 -0800
commit07e326610e5634e5038fce32fff370949eb42101 (patch)
treee5e1e1a421de8302a9de8865663ce1e8923035b0 /arch/powerpc
parentb528e4b6405b9fd656a6a308a7e2aa6afa50e77d (diff)
mm: add tlb_remove_check_page_size_change to track page size change
With commit e77b0852b551 ("mm/mmu_gather: track page size with mmu gather and force flush if page size change") we added the ability to force a tlb flush when the page size change in a mmu_gather loop. We did that by checking for a page size change every time we added a page to mmu_gather for lazy flush/remove. We can improve that by moving the page size change check early and not doing it every time we add a page. This also helps us to do tlb flush when invalidating a range covering dax mapping. Wrt dax mapping we don't have a backing struct page and hence we don't call tlb_remove_page, which earlier forced the tlb flush on page size change. Moving the page size change check earlier means we will do the same even for dax mapping. We also avoid doing this check on architecture other than powerpc. In a later patch we will remove page size check from tlb_remove_page(). Link: http://lkml.kernel.org/r/20161026084839.27299-5-aneesh.kumar@linux.vnet.ibm.com Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/include/asm/tlb.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/tlb.h b/arch/powerpc/include/asm/tlb.h
index 99e1397b71da..609557569f65 100644
--- a/arch/powerpc/include/asm/tlb.h
+++ b/arch/powerpc/include/asm/tlb.h
@@ -28,6 +28,7 @@
#define tlb_start_vma(tlb, vma) do { } while (0)
#define tlb_end_vma(tlb, vma) do { } while (0)
#define __tlb_remove_tlb_entry __tlb_remove_tlb_entry
+#define tlb_remove_check_page_size_change tlb_remove_check_page_size_change
extern void tlb_flush(struct mmu_gather *tlb);
@@ -46,6 +47,21 @@ static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
#endif
}
+static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
+ unsigned int page_size)
+{
+ if (!tlb->page_size)
+ tlb->page_size = page_size;
+ else if (tlb->page_size != page_size) {
+ tlb_flush_mmu(tlb);
+ /*
+ * update the page size after flush for the new
+ * mmu_gather.
+ */
+ tlb->page_size = page_size;
+ }
+}
+
#ifdef CONFIG_SMP
static inline int mm_is_core_local(struct mm_struct *mm)
{