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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2016-02-09 06:50:31 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2016-02-15 21:10:04 +1100
commitc777e2a8b65420b31dac28a453e35be984f5808b (patch)
parent1bc74f1ccd457832dc515fc1febe6655985fdcd2 (diff)
powerpc/mm: Fix Multi hit ERAT cause by recent THP update
With ppc64 we use the deposited pgtable_t to store the hash pte slot information. We should not withdraw the deposited pgtable_t without marking the pmd none. This ensure that low level hash fault handling will skip this huge pte and we will handle them at upper levels. Recent change to pmd splitting changed the above in order to handle the race between pmd split and exit_mmap. The race is explained below. Consider following race: CPU0 CPU1 shrink_page_list() add_to_swap() split_huge_page_to_list() __split_huge_pmd_locked() pmdp_huge_clear_flush_notify() // pmd_none() == true exit_mmap() unmap_vmas() zap_pmd_range() // no action on pmd since pmd_none() == true pmd_populate() As result the THP will not be freed. The leak is detected by check_mm(): BUG: Bad rss-counter state mm:ffff880058d2e580 idx:1 val:512 The above required us to not mark pmd none during a pmd split. The fix for ppc is to clear the huge pte of _PAGE_USER, so that low level fault handling code skip this pte. At higher level we do take ptl lock. That should serialze us against the pmd split. Once the lock is acquired we do check the pmd again using pmd_same. That should always return false for us and hence we should retry the access. We do the pmd_same check in all case after taking plt with THP (do_huge_pmd_wp_page, do_huge_pmd_numa_page and huge_pmd_set_accessed) Also make sure we wait for irq disable section in other cpus to finish before flipping a huge pte entry with a regular pmd entry. Code paths like find_linux_pte_or_hugepte depend on irq disable to get a stable pte_t pointer. A parallel thp split need to make sure we don't convert a pmd pte to a regular pmd entry without waiting for the irq disable section to finish. Fixes: eef1b3ba053a ("thp: implement split_huge_pmd()") Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
4 files changed, 45 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 8d1c41d28318..ac07a30a7934 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -281,6 +281,10 @@ extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp);
+extern void pmdp_huge_split_prepare(struct vm_area_struct *vma,
+ unsigned long address, pmd_t *pmdp);
#define pmd_move_must_withdraw pmd_move_must_withdraw
struct spinlock;
static inline int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl,
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 3124a20d0fab..cdf2123d46db 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -646,6 +646,28 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
return pgtable;
+void pmdp_huge_split_prepare(struct vm_area_struct *vma,
+ unsigned long address, pmd_t *pmdp)
+ VM_BUG_ON(address & ~HPAGE_PMD_MASK);
+ /*
+ * We can't mark the pmd none here, because that will cause a race
+ * against exit_mmap. We need to continue mark pmd TRANS HUGE, while
+ * we spilt, but at the same time we wan't rest of the ppc64 code
+ * not to insert hash pte on this, because we will be modifying
+ * the deposited pgtable in the caller of this function. Hence
+ * clear the _PAGE_USER so that we move the fault handling to
+ * higher level function and that will serialize against ptl.
+ * We need to flush existing hash pte entries here even though,
+ * the translation is still valid, because we will withdraw
+ * pgtable_t after this.
+ */
+ pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_USER, 0);
* set a new huge pmd. We should not be called for updating
* an existing pmd entry. That should go via pmd_hugepage_update.
@@ -663,10 +685,20 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr,
return set_pte_at(mm, addr, pmdp_ptep(pmdp), pmd_pte(pmd));
+ * We use this to invalidate a pmdp entry before switching from a
+ * hugepte to regular pmd entry.
+ */
void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp)
pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, 0);
+ /*
+ * This ensures that generic code that rely on IRQ disabling
+ * to prevent a parallel THP split work as expected.
+ */
+ kick_all_cpus_sync();
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 0b3c0d39ef75..c370b261c720 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -239,6 +239,14 @@ extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp);
+static inline void pmdp_huge_split_prepare(struct vm_area_struct *vma,
+ unsigned long address, pmd_t *pmdp)
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 b1cf73bc3b12..de3f43cde129 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2856,6 +2856,7 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
young = pmd_young(*pmd);
dirty = pmd_dirty(*pmd);
+ pmdp_huge_split_prepare(vma, haddr, pmd);
pgtable = pgtable_trans_huge_withdraw(mm, pmd);
pmd_populate(mm, &_pmd, pgtable);