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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2016-07-27 01:24:09 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-27 02:19:19 +0300
commite9d55e157034a9efd99405c99c1565d64619d82b (patch)
treed97dfd0c54d5a9fd1c7b6292c64c83791f9f5278 /arch
parent31d49da5ad01728e48a1bb2b43795598b23de68a (diff)
downloadlinux-e9d55e157034a9efd99405c99c1565d64619d82b.tar.xz
mm: change the interface for __tlb_remove_page()
This updates the generic and arch specific implementation to return true if we need to do a tlb flush. That means if a __tlb_remove_page indicate a flush is needed, the page we try to remove need to be tracked and added again after the flush. We need to track it because we have already update the pte to none and we can't just loop back. This change is done to enable us to do a tlb_flush when we try to flush a range that consists of different page sizes. For architectures like ppc64, we can do a range based tlb flush and we need to track page size for that. When we try to remove a huge page, we will force a tlb flush and starts a new mmu gather. [aneesh.kumar@linux.vnet.ibm.com: mm-change-the-interface-for-__tlb_remove_page-v3] Link: http://lkml.kernel.org/r/1465049193-22197-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1464860389-29019-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Hugh Dickins <hughd@google.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Mel Gorman <mgorman@suse.de> Cc: David Rientjes <rientjes@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/include/asm/tlb.h17
-rw-r--r--arch/ia64/include/asm/tlb.h19
-rw-r--r--arch/s390/include/asm/tlb.h9
-rw-r--r--arch/sh/include/asm/tlb.h8
-rw-r--r--arch/um/include/asm/tlb.h8
5 files changed, 48 insertions, 13 deletions
diff --git a/arch/arm/include/asm/tlb.h b/arch/arm/include/asm/tlb.h
index 3cadb726ec88..a9d2aee3826f 100644
--- a/arch/arm/include/asm/tlb.h
+++ b/arch/arm/include/asm/tlb.h
@@ -209,17 +209,26 @@ tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
tlb_flush(tlb);
}
-static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
+static inline bool __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
+ if (tlb->nr == tlb->max)
+ return true;
tlb->pages[tlb->nr++] = page;
- VM_BUG_ON(tlb->nr > tlb->max);
- return tlb->max - tlb->nr;
+ return false;
}
static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
- if (!__tlb_remove_page(tlb, page))
+ if (__tlb_remove_page(tlb, page)) {
tlb_flush_mmu(tlb);
+ __tlb_remove_page(tlb, page);
+ }
+}
+
+static inline bool __tlb_remove_pte_page(struct mmu_gather *tlb,
+ struct page *page)
+{
+ return __tlb_remove_page(tlb, page);
}
static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
diff --git a/arch/ia64/include/asm/tlb.h b/arch/ia64/include/asm/tlb.h
index 39d64e0df1de..e7da41aa9110 100644
--- a/arch/ia64/include/asm/tlb.h
+++ b/arch/ia64/include/asm/tlb.h
@@ -205,17 +205,18 @@ tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
* must be delayed until after the TLB has been flushed (see comments at the beginning of
* this file).
*/
-static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
+static inline bool __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
+ if (tlb->nr == tlb->max)
+ return true;
+
tlb->need_flush = 1;
if (!tlb->nr && tlb->pages == tlb->local)
__tlb_alloc_page(tlb);
tlb->pages[tlb->nr++] = page;
- VM_BUG_ON(tlb->nr > tlb->max);
-
- return tlb->max - tlb->nr;
+ return false;
}
static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
@@ -235,8 +236,16 @@ static inline void tlb_flush_mmu(struct mmu_gather *tlb)
static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
- if (!__tlb_remove_page(tlb, page))
+ if (__tlb_remove_page(tlb, page)) {
tlb_flush_mmu(tlb);
+ __tlb_remove_page(tlb, page);
+ }
+}
+
+static inline bool __tlb_remove_pte_page(struct mmu_gather *tlb,
+ struct page *page)
+{
+ return __tlb_remove_page(tlb, page);
}
/*
diff --git a/arch/s390/include/asm/tlb.h b/arch/s390/include/asm/tlb.h
index 7a92e69c50bc..30759b560849 100644
--- a/arch/s390/include/asm/tlb.h
+++ b/arch/s390/include/asm/tlb.h
@@ -87,10 +87,10 @@ static inline void tlb_finish_mmu(struct mmu_gather *tlb,
* tlb_ptep_clear_flush. In both flush modes the tlb for a page cache page
* has already been freed, so just do free_page_and_swap_cache.
*/
-static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
+static inline bool __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
free_page_and_swap_cache(page);
- return 1; /* avoid calling tlb_flush_mmu */
+ return false; /* avoid calling tlb_flush_mmu */
}
static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
@@ -98,6 +98,11 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
free_page_and_swap_cache(page);
}
+static inline bool __tlb_remove_pte_page(struct mmu_gather *tlb,
+ struct page *page)
+{
+ return __tlb_remove_page(tlb, page);
+}
/*
* pte_free_tlb frees a pte table and clears the CRSTE for the
* page table from the tlb.
diff --git a/arch/sh/include/asm/tlb.h b/arch/sh/include/asm/tlb.h
index 62f80d2a9df9..21ae8f5546b2 100644
--- a/arch/sh/include/asm/tlb.h
+++ b/arch/sh/include/asm/tlb.h
@@ -101,7 +101,7 @@ static inline void tlb_flush_mmu(struct mmu_gather *tlb)
static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
free_page_and_swap_cache(page);
- return 1; /* avoid calling tlb_flush_mmu */
+ return false; /* avoid calling tlb_flush_mmu */
}
static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
@@ -109,6 +109,12 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
__tlb_remove_page(tlb, page);
}
+static inline bool __tlb_remove_pte_page(struct mmu_gather *tlb,
+ struct page *page)
+{
+ return __tlb_remove_page(tlb, page);
+}
+
#define pte_free_tlb(tlb, ptep, addr) pte_free((tlb)->mm, ptep)
#define pmd_free_tlb(tlb, pmdp, addr) pmd_free((tlb)->mm, pmdp)
#define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp)
diff --git a/arch/um/include/asm/tlb.h b/arch/um/include/asm/tlb.h
index 16eb63fac57d..3dc4cbb3c2c0 100644
--- a/arch/um/include/asm/tlb.h
+++ b/arch/um/include/asm/tlb.h
@@ -102,7 +102,7 @@ static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
tlb->need_flush = 1;
free_page_and_swap_cache(page);
- return 1; /* avoid calling tlb_flush_mmu */
+ return false; /* avoid calling tlb_flush_mmu */
}
static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
@@ -110,6 +110,12 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
__tlb_remove_page(tlb, page);
}
+static inline bool __tlb_remove_pte_page(struct mmu_gather *tlb,
+ struct page *page)
+{
+ return __tlb_remove_page(tlb, page);
+}
+
/**
* tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation.
*