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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2016-12-13 03:42:40 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-13 05:55:07 +0300
commit07e326610e5634e5038fce32fff370949eb42101 (patch)
treee5e1e1a421de8302a9de8865663ce1e8923035b0 /mm/memory.c
parentb528e4b6405b9fd656a6a308a7e2aa6afa50e77d (diff)
downloadlinux-07e326610e5634e5038fce32fff370949eb42101.tar.xz
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 'mm/memory.c')
-rw-r--r--mm/memory.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c
index d86b7b4afd7d..eae20eb66bfc 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -528,7 +528,11 @@ void free_pgd_range(struct mmu_gather *tlb,
end -= PMD_SIZE;
if (addr > end - 1)
return;
-
+ /*
+ * We add page table cache pages with PAGE_SIZE,
+ * (see pte_free_tlb()), flush the tlb if we need
+ */
+ tlb_remove_check_page_size_change(tlb, PAGE_SIZE);
pgd = pgd_offset(tlb->mm, addr);
do {
next = pgd_addr_end(addr, end);
@@ -1120,6 +1124,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
swp_entry_t entry;
struct page *pending_page = NULL;
+ tlb_remove_check_page_size_change(tlb, PAGE_SIZE);
again:
init_rss_vec(rss);
start_pte = pte_offset_map_lock(mm, pmd, addr, &ptl);