Re: [PATCH 1/6] mmu_notifier: add event information to address invalidation v6
From: Jerome Glisse
Date: Mon Jan 12 2015 - 10:40:11 EST
On Sun, Jan 11, 2015 at 02:24:01PM +0200, Oded Gabbay wrote:
>
>
> On 01/06/2015 12:44 AM, j.glisse@xxxxxxxxx wrote:
> > From: Jérôme Glisse <jglisse@xxxxxxxxxx>
> >
> > The event information will be useful for new user of mmu_notifier API.
> > The event argument differentiate between a vma disappearing, a page
> > being write protected or simply a page being unmaped. This allow new
> > user to take different path for different event for instance on unmap
> > the resource used to track a vma are still valid and should stay around.
> > While if the event is saying that a vma is being destroy it means that any
> > resources used to track this vma can be free.
> >
> > Changed since v1:
> > - renamed action into event (updated commit message too).
> > - simplified the event names and clarified their usage
> > also documenting what exceptation the listener can have in
> > respect to each event.
> >
> > Changed since v2:
> > - Avoid crazy name.
> > - Do not move code that do not need to move.
> >
> > Changed since v3:
> > - Separate hugue page split from mlock/munlock and softdirty.
> >
> > Changed since v4:
> > - Rebase (no other changes).
> >
> > Changed since v5:
> > - Typo fix.
> > - Changed zap_page_range from MMU_MUNMAP to MMU_MIGRATE to reflect the
> > fact that the address range is still valid just the page backing it
> > are no longer.
> >
> > Signed-off-by: Jérôme Glisse <jglisse@xxxxxxxxxx>
> > Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/i915_gem_userptr.c | 3 +-
> > drivers/gpu/drm/radeon/radeon_mn.c | 3 +-
> > drivers/infiniband/core/umem_odp.c | 9 ++-
> > drivers/iommu/amd_iommu_v2.c | 3 +-
> > drivers/misc/sgi-gru/grutlbpurge.c | 9 ++-
> > drivers/xen/gntdev.c | 9 ++-
> > fs/proc/task_mmu.c | 6 +-
> > include/linux/mmu_notifier.h | 131 ++++++++++++++++++++++++++------
> > kernel/events/uprobes.c | 10 ++-
> > mm/filemap_xip.c | 2 +-
> > mm/huge_memory.c | 39 ++++++----
> > mm/hugetlb.c | 23 +++---
> > mm/ksm.c | 18 +++--
> > mm/madvise.c | 4 +-
> > mm/memory.c | 27 ++++---
> > mm/migrate.c | 9 ++-
> > mm/mmu_notifier.c | 28 ++++---
> > mm/mprotect.c | 6 +-
> > mm/mremap.c | 6 +-
> > mm/rmap.c | 24 ++++--
> > virt/kvm/kvm_main.c | 12 ++-
> > 21 files changed, 274 insertions(+), 107 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
> > index d182058..20dbd26 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_userptr.c
> > +++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
> > @@ -129,7 +129,8 @@ restart:
> > static void i915_gem_userptr_mn_invalidate_range_start(struct mmu_notifier *_mn,
> > struct mm_struct *mm,
> > unsigned long start,
> > - unsigned long end)
> > + unsigned long end,
> > + enum mmu_event event)
> > {
> > struct i915_mmu_notifier *mn = container_of(_mn, struct i915_mmu_notifier, mn);
> > struct interval_tree_node *it = NULL;
> > diff --git a/drivers/gpu/drm/radeon/radeon_mn.c b/drivers/gpu/drm/radeon/radeon_mn.c
> > index a69bd44..daf53d3 100644
> > --- a/drivers/gpu/drm/radeon/radeon_mn.c
> > +++ b/drivers/gpu/drm/radeon/radeon_mn.c
> > @@ -109,7 +109,8 @@ static void radeon_mn_release(struct mmu_notifier *mn,
> > static void radeon_mn_invalidate_range_start(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > unsigned long start,
> > - unsigned long end)
> > + unsigned long end,
> > + enum mmu_event event)
> > {
> > struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
> > struct interval_tree_node *it;
> > diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c
> > index 6095872..bc36e8c 100644
> > --- a/drivers/infiniband/core/umem_odp.c
> > +++ b/drivers/infiniband/core/umem_odp.c
> > @@ -165,7 +165,8 @@ static int invalidate_page_trampoline(struct ib_umem *item, u64 start,
> >
> > static void ib_umem_notifier_invalidate_page(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > - unsigned long address)
> > + unsigned long address,
> > + enum mmu_event event)
> > {
> > struct ib_ucontext *context = container_of(mn, struct ib_ucontext, mn);
> >
> > @@ -192,7 +193,8 @@ static int invalidate_range_start_trampoline(struct ib_umem *item, u64 start,
> > static void ib_umem_notifier_invalidate_range_start(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > unsigned long start,
> > - unsigned long end)
> > + unsigned long end,
> > + enum mmu_event event)
> > {
> > struct ib_ucontext *context = container_of(mn, struct ib_ucontext, mn);
> >
> > @@ -217,7 +219,8 @@ static int invalidate_range_end_trampoline(struct ib_umem *item, u64 start,
> > static void ib_umem_notifier_invalidate_range_end(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > unsigned long start,
> > - unsigned long end)
> > + unsigned long end,
> > + enum mmu_event event)
> > {
> > struct ib_ucontext *context = container_of(mn, struct ib_ucontext, mn);
> >
> > diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
> > index 90f70d0..31acb07 100644
> > --- a/drivers/iommu/amd_iommu_v2.c
> > +++ b/drivers/iommu/amd_iommu_v2.c
> > @@ -402,7 +402,8 @@ static int mn_clear_flush_young(struct mmu_notifier *mn,
> >
> > static void mn_invalidate_page(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > - unsigned long address)
> > + unsigned long address,
> > + enum mmu_event event)
> > {
> > __mn_flush_page(mn, address);
> > }
> > diff --git a/drivers/misc/sgi-gru/grutlbpurge.c b/drivers/misc/sgi-gru/grutlbpurge.c
> > index 2129274..e67fed1 100644
> > --- a/drivers/misc/sgi-gru/grutlbpurge.c
> > +++ b/drivers/misc/sgi-gru/grutlbpurge.c
> > @@ -221,7 +221,8 @@ void gru_flush_all_tlb(struct gru_state *gru)
> > */
> > static void gru_invalidate_range_start(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > - unsigned long start, unsigned long end)
> > + unsigned long start, unsigned long end,
> > + enum mmu_event event)
> > {
> > struct gru_mm_struct *gms = container_of(mn, struct gru_mm_struct,
> > ms_notifier);
> > @@ -235,7 +236,8 @@ static void gru_invalidate_range_start(struct mmu_notifier *mn,
> >
> > static void gru_invalidate_range_end(struct mmu_notifier *mn,
> > struct mm_struct *mm, unsigned long start,
> > - unsigned long end)
> > + unsigned long end,
> > + enum mmu_event event)
> > {
> > struct gru_mm_struct *gms = container_of(mn, struct gru_mm_struct,
> > ms_notifier);
> > @@ -248,7 +250,8 @@ static void gru_invalidate_range_end(struct mmu_notifier *mn,
> > }
> >
> > static void gru_invalidate_page(struct mmu_notifier *mn, struct mm_struct *mm,
> > - unsigned long address)
> > + unsigned long address,
> > + enum mmu_event event)
> > {
> > struct gru_mm_struct *gms = container_of(mn, struct gru_mm_struct,
> > ms_notifier);
> > diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
> > index 073b4a1..fe9da94 100644
> > --- a/drivers/xen/gntdev.c
> > +++ b/drivers/xen/gntdev.c
> > @@ -428,7 +428,9 @@ static void unmap_if_in_range(struct grant_map *map,
> >
> > static void mn_invl_range_start(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > - unsigned long start, unsigned long end)
> > + unsigned long start,
> > + unsigned long end,
> > + enum mmu_event event)
> > {
> > struct gntdev_priv *priv = container_of(mn, struct gntdev_priv, mn);
> > struct grant_map *map;
> > @@ -445,9 +447,10 @@ static void mn_invl_range_start(struct mmu_notifier *mn,
> >
> > static void mn_invl_page(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > - unsigned long address)
> > + unsigned long address,
> > + enum mmu_event event)
> > {
> > - mn_invl_range_start(mn, mm, address, address + PAGE_SIZE);
> > + mn_invl_range_start(mn, mm, address, address + PAGE_SIZE, event);
> > }
> >
> > static void mn_release(struct mmu_notifier *mn,
> > diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> > index 246eae8..8a79a74 100644
> > --- a/fs/proc/task_mmu.c
> > +++ b/fs/proc/task_mmu.c
> > @@ -875,7 +875,8 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
> > downgrade_write(&mm->mmap_sem);
> > break;
> > }
> > - mmu_notifier_invalidate_range_start(mm, 0, -1);
> > + mmu_notifier_invalidate_range_start(mm, 0,
> > + -1, MMU_ISDIRTY);
> > }
> > for (vma = mm->mmap; vma; vma = vma->vm_next) {
> > cp.vma = vma;
> > @@ -900,7 +901,8 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
> > &clear_refs_walk);
> > }
> > if (type == CLEAR_REFS_SOFT_DIRTY)
> > - mmu_notifier_invalidate_range_end(mm, 0, -1);
> > + mmu_notifier_invalidate_range_end(mm, 0,
> > + -1, MMU_ISDIRTY);
> > flush_tlb_mm(mm);
> > up_read(&mm->mmap_sem);
> > mmput(mm);
> > diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
> > index 95243d2..ac2a121 100644
> > --- a/include/linux/mmu_notifier.h
> > +++ b/include/linux/mmu_notifier.h
> > @@ -9,6 +9,66 @@
> > struct mmu_notifier;
> > struct mmu_notifier_ops;
> >
> > +/* MMU Events report fine-grained information to the callback routine, allowing
> > + * the event listener to make a more informed decision as to what action to
> > + * take. The event types are:
> > + *
> > + * - MMU_HSPLIT huge page split, the memory is the same only the page table
> > + * structure is updated (level added or removed).
> > + *
> > + * - MMU_ISDIRTY need to update the dirty bit of the page table so proper
> > + * dirty accounting can happen.
> > + *
> > + * - MMU_MIGRATE: memory is migrating from one page to another, thus all write
> > + * access must stop after invalidate_range_start callback returns.
> > + * Furthermore, no read access should be allowed either, as a new page can
> > + * be remapped with write access before the invalidate_range_end callback
> > + * happens and thus any read access to old page might read stale data. There
> > + * are several sources for this event, including:
> > + *
> > + * - A page moving to swap (various reasons, including page reclaim),
> > + * - An mremap syscall,
> > + * - migration for NUMA reasons,
> > + * - balancing the memory pool,
> > + * - write fault on COW page,
> > + * - and more that are not listed here.
> > + *
> > + * - MMU_MPROT: memory access protection is changing. Refer to the vma to get
> > + * the new access protection. All memory access are still valid until the
> > + * invalidate_range_end callback.
> > + *
> > + * - MMU_MUNLOCK: unlock memory. Content of page table stays the same but
> > + * page are unlocked.
> > + *
> > + * - MMU_MUNMAP: the range is being unmapped (outcome of a munmap syscall or
> > + * process destruction). However, access is still allowed, up until the
> > + * invalidate_range_free_pages callback. This also implies that secondary
> > + * page table can be trimmed, because the address range is no longer valid.
> > + *
> > + * - MMU_WRITE_BACK: memory is being written back to disk, all write accesses
> > + * must stop after invalidate_range_start callback returns. Read access are
> > + * still allowed.
> > + *
> > + * - MMU_WRITE_PROTECT: memory is being write protected (ie should be mapped
> > + * read only no matter what the vma memory protection allows). All write
> > + * accesses must stop after invalidate_range_start callback returns. Read
> > + * access are still allowed.
> > + *
> > + * If in doubt when adding a new notifier caller, please use MMU_MIGRATE,
> > + * because it will always lead to reasonable behavior, but will not allow the
> > + * listener a chance to optimize its events.
> > + */
> > +enum mmu_event {
> > + MMU_HSPLIT = 0,
> > + MMU_ISDIRTY,
> > + MMU_MIGRATE,
> > + MMU_MPROT,
> > + MMU_MUNLOCK,
> > + MMU_MUNMAP,
> > + MMU_WRITE_BACK,
> > + MMU_WRITE_PROTECT,
> > +};
> > +
> > #ifdef CONFIG_MMU_NOTIFIER
> >
> > /*
> > @@ -82,7 +142,8 @@ struct mmu_notifier_ops {
> > void (*change_pte)(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > unsigned long address,
> > - pte_t pte);
> > + pte_t pte,
> > + enum mmu_event event);
> >
> > /*
> > * Before this is invoked any secondary MMU is still ok to
> > @@ -93,7 +154,8 @@ struct mmu_notifier_ops {
> > */
> > void (*invalidate_page)(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > - unsigned long address);
> > + unsigned long address,
> > + enum mmu_event event);
> >
> > /*
> > * invalidate_range_start() and invalidate_range_end() must be
> > @@ -140,10 +202,14 @@ struct mmu_notifier_ops {
> > */
> > void (*invalidate_range_start)(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > - unsigned long start, unsigned long end);
> > + unsigned long start,
> > + unsigned long end,
> > + enum mmu_event event);
> > void (*invalidate_range_end)(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > - unsigned long start, unsigned long end);
> > + unsigned long start,
> > + unsigned long end,
> > + enum mmu_event event);
> >
> > /*
> > * invalidate_range() is either called between
> > @@ -206,13 +272,20 @@ extern int __mmu_notifier_clear_flush_young(struct mm_struct *mm,
> > extern int __mmu_notifier_test_young(struct mm_struct *mm,
> > unsigned long address);
> > extern void __mmu_notifier_change_pte(struct mm_struct *mm,
> > - unsigned long address, pte_t pte);
> > + unsigned long address,
> > + pte_t pte,
> > + enum mmu_event event);
> > extern void __mmu_notifier_invalidate_page(struct mm_struct *mm,
> > - unsigned long address);
> > + unsigned long address,
> > + enum mmu_event event);
> > extern void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
> > - unsigned long start, unsigned long end);
> > + unsigned long start,
> > + unsigned long end,
> > + enum mmu_event event);
> > extern void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
> > - unsigned long start, unsigned long end);
> > + unsigned long start,
> > + unsigned long end,
> > + enum mmu_event event);
> > extern void __mmu_notifier_invalidate_range(struct mm_struct *mm,
> > unsigned long start, unsigned long end);
> >
> > @@ -240,31 +313,38 @@ static inline int mmu_notifier_test_young(struct mm_struct *mm,
> > }
> >
> > static inline void mmu_notifier_change_pte(struct mm_struct *mm,
> > - unsigned long address, pte_t pte)
> > + unsigned long address,
> > + pte_t pte,
> > + enum mmu_event event)
> > {
> > if (mm_has_notifiers(mm))
> > - __mmu_notifier_change_pte(mm, address, pte);
> > + __mmu_notifier_change_pte(mm, address, pte, event);
> > }
> >
> > static inline void mmu_notifier_invalidate_page(struct mm_struct *mm,
> > - unsigned long address)
> > + unsigned long address,
> > + enum mmu_event event)
> > {
> > if (mm_has_notifiers(mm))
> > - __mmu_notifier_invalidate_page(mm, address);
> > + __mmu_notifier_invalidate_page(mm, address, event);
> > }
> >
> > static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm,
> > - unsigned long start, unsigned long end)
> > + unsigned long start,
> > + unsigned long end,
> > + enum mmu_event event)
> > {
> > if (mm_has_notifiers(mm))
> > - __mmu_notifier_invalidate_range_start(mm, start, end);
> > + __mmu_notifier_invalidate_range_start(mm, start, end, event);
> > }
> >
> > static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm,
> > - unsigned long start, unsigned long end)
> > + unsigned long start,
> > + unsigned long end,
> > + enum mmu_event event)
> > {
> > if (mm_has_notifiers(mm))
> > - __mmu_notifier_invalidate_range_end(mm, start, end);
> > + __mmu_notifier_invalidate_range_end(mm, start, end, event);
> > }
> >
> > static inline void mmu_notifier_invalidate_range(struct mm_struct *mm,
> > @@ -359,13 +439,13 @@ static inline void mmu_notifier_mm_destroy(struct mm_struct *mm)
> > * old page would remain mapped readonly in the secondary MMUs after the new
> > * page is already writable by some CPU through the primary MMU.
> > */
> > -#define set_pte_at_notify(__mm, __address, __ptep, __pte) \
> > +#define set_pte_at_notify(__mm, __address, __ptep, __pte, __event) \
> > ({ \
> > struct mm_struct *___mm = __mm; \
> > unsigned long ___address = __address; \
> > pte_t ___pte = __pte; \
> > \
> > - mmu_notifier_change_pte(___mm, ___address, ___pte); \
> > + mmu_notifier_change_pte(___mm, ___address, ___pte, __event); \
> > set_pte_at(___mm, ___address, __ptep, ___pte); \
> > })
> >
> > @@ -393,22 +473,29 @@ static inline int mmu_notifier_test_young(struct mm_struct *mm,
> > }
> >
> > static inline void mmu_notifier_change_pte(struct mm_struct *mm,
> > - unsigned long address, pte_t pte)
> > + unsigned long address,
> > + pte_t pte,
> > + enum mmu_event event)
> > {
> > }
> >
> > static inline void mmu_notifier_invalidate_page(struct mm_struct *mm,
> > - unsigned long address)
> > + unsigned long address,
> > + enum mmu_event event)
> > {
> > }
> >
> > static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm,
> > - unsigned long start, unsigned long end)
> > + unsigned long start,
> > + unsigned long end,
> > + enum mmu_event event)
> > {
> > }
> >
> > static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm,
> > - unsigned long start, unsigned long end)
> > + unsigned long start,
> > + unsigned long end,
> > + enum mmu_event event)
> > {
> > }
> >
> > diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> > index cb346f2..802828a 100644
> > --- a/kernel/events/uprobes.c
> > +++ b/kernel/events/uprobes.c
> > @@ -176,7 +176,8 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
> > /* For try_to_free_swap() and munlock_vma_page() below */
> > lock_page(page);
> >
> > - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_start(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> > err = -EAGAIN;
> > ptep = page_check_address(page, mm, addr, &ptl, 0);
> > if (!ptep)
> > @@ -194,7 +195,9 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
> >
> > flush_cache_page(vma, addr, pte_pfn(*ptep));
> > ptep_clear_flush_notify(vma, addr, ptep);
> > - set_pte_at_notify(mm, addr, ptep, mk_pte(kpage, vma->vm_page_prot));
> > + set_pte_at_notify(mm, addr, ptep,
> > + mk_pte(kpage, vma->vm_page_prot),
> > + MMU_MIGRATE);
> >
> > page_remove_rmap(page);
> > if (!page_mapped(page))
> > @@ -208,7 +211,8 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
> > err = 0;
> > unlock:
> > mem_cgroup_cancel_charge(kpage, memcg);
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> > unlock_page(page);
> > return err;
> > }
> > diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
> > index 0d105ae..fb97c7c 100644
> > --- a/mm/filemap_xip.c
> > +++ b/mm/filemap_xip.c
> > @@ -193,7 +193,7 @@ retry:
> > BUG_ON(pte_dirty(pteval));
> > pte_unmap_unlock(pte, ptl);
> > /* must invalidate_page _before_ freeing the page */
> > - mmu_notifier_invalidate_page(mm, address);
> > + mmu_notifier_invalidate_page(mm, address, MMU_MIGRATE);
> > page_cache_release(page);
> > }
> > }
> > diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> > index cf3b67b..75eb651 100644
> > --- a/mm/huge_memory.c
> > +++ b/mm/huge_memory.c
> > @@ -1028,7 +1028,8 @@ static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
> >
> > mmun_start = haddr;
> > mmun_end = haddr + HPAGE_PMD_SIZE;
> > - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end,
> > + MMU_MIGRATE);
> >
> > ptl = pmd_lock(mm, pmd);
> > if (unlikely(!pmd_same(*pmd, orig_pmd)))
> > @@ -1062,7 +1063,8 @@ static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
> > page_remove_rmap(page);
> > spin_unlock(ptl);
> >
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> >
> > ret |= VM_FAULT_WRITE;
> > put_page(page);
> > @@ -1072,7 +1074,8 @@ out:
> >
> > out_free_pages:
> > spin_unlock(ptl);
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> > for (i = 0; i < HPAGE_PMD_NR; i++) {
> > memcg = (void *)page_private(pages[i]);
> > set_page_private(pages[i], 0);
> > @@ -1164,7 +1167,8 @@ alloc:
> >
> > mmun_start = haddr;
> > mmun_end = haddr + HPAGE_PMD_SIZE;
> > - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end,
> > + MMU_MIGRATE);
> >
> > spin_lock(ptl);
> > if (page)
> > @@ -1196,7 +1200,8 @@ alloc:
> > }
> > spin_unlock(ptl);
> > out_mn:
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> > out:
> > return ret;
> > out_unlock:
> > @@ -1667,7 +1672,8 @@ static int __split_huge_page_splitting(struct page *page,
> > const unsigned long mmun_start = address;
> > const unsigned long mmun_end = address + HPAGE_PMD_SIZE;
> >
> > - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_start(mm, mmun_start,
> > + mmun_end, MMU_HSPLIT);
> > pmd = page_check_address_pmd(page, mm, address,
> > PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG, &ptl);
> > if (pmd) {
> > @@ -1683,7 +1689,8 @@ static int __split_huge_page_splitting(struct page *page,
> > ret = 1;
> > spin_unlock(ptl);
> > }
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmun_end, MMU_HSPLIT);
> >
> > return ret;
> > }
> > @@ -2504,7 +2511,8 @@ static void collapse_huge_page(struct mm_struct *mm,
> >
> > mmun_start = address;
> > mmun_end = address + HPAGE_PMD_SIZE;
> > - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_start(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> > pmd_ptl = pmd_lock(mm, pmd); /* probably unnecessary */
> > /*
> > * After this gup_fast can't run anymore. This also removes
> > @@ -2514,7 +2522,8 @@ static void collapse_huge_page(struct mm_struct *mm,
> > */
> > _pmd = pmdp_clear_flush(vma, address, pmd);
> > spin_unlock(pmd_ptl);
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> >
> > spin_lock(pte_ptl);
> > isolated = __collapse_huge_page_isolate(vma, address, pte);
> > @@ -2905,24 +2914,28 @@ void __split_huge_page_pmd(struct vm_area_struct *vma, unsigned long address,
> > mmun_start = haddr;
> > mmun_end = haddr + HPAGE_PMD_SIZE;
> > again:
> > - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_start(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> > ptl = pmd_lock(mm, pmd);
> > if (unlikely(!pmd_trans_huge(*pmd))) {
> > spin_unlock(ptl);
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> > return;
> > }
> > if (is_huge_zero_pmd(*pmd)) {
> > __split_huge_zero_page_pmd(vma, haddr, pmd);
> > spin_unlock(ptl);
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> > return;
> > }
> > page = pmd_page(*pmd);
> > VM_BUG_ON_PAGE(!page_count(page), page);
> > get_page(page);
> > spin_unlock(ptl);
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> >
> > split_huge_page(page);
> >
> > diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> > index 85032de..b4770c4 100644
> > --- a/mm/hugetlb.c
> > +++ b/mm/hugetlb.c
> > @@ -2560,7 +2560,8 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
> > mmun_start = vma->vm_start;
> > mmun_end = vma->vm_end;
> > if (cow)
> > - mmu_notifier_invalidate_range_start(src, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_start(src, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> >
> > for (addr = vma->vm_start; addr < vma->vm_end; addr += sz) {
> > spinlock_t *src_ptl, *dst_ptl;
> > @@ -2614,7 +2615,8 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
> > }
> >
> > if (cow)
> > - mmu_notifier_invalidate_range_end(src, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(src, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> >
> > return ret;
> > }
> > @@ -2640,7 +2642,8 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
> > BUG_ON(end & ~huge_page_mask(h));
> >
> > tlb_start_vma(tlb, vma);
> > - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_start(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> > address = start;
> > again:
> > for (; address < end; address += sz) {
> > @@ -2713,7 +2716,8 @@ unlock:
> > if (address < end && !ref_page)
> > goto again;
> > }
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> > tlb_end_vma(tlb, vma);
> > }
> >
> > @@ -2891,8 +2895,8 @@ retry_avoidcopy:
> >
> > mmun_start = address & huge_page_mask(h);
> > mmun_end = mmun_start + huge_page_size(h);
> > - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
> > -
> > + mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end,
> > + MMU_MIGRATE);
> > /*
> > * Retake the page table lock to check for racing updates
> > * before the page tables are altered
> > @@ -2913,7 +2917,8 @@ retry_avoidcopy:
> > new_page = old_page;
> > }
> > spin_unlock(ptl);
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end,
> > + MMU_MIGRATE);
> > out_release_all:
> > page_cache_release(new_page);
> > out_release_old:
> > @@ -3351,7 +3356,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
> > BUG_ON(address >= end);
> > flush_cache_range(vma, address, end);
> >
> > - mmu_notifier_invalidate_range_start(mm, start, end);
> > + mmu_notifier_invalidate_range_start(mm, start, end, MMU_MPROT);
> > i_mmap_lock_write(vma->vm_file->f_mapping);
> > for (; address < end; address += huge_page_size(h)) {
> > spinlock_t *ptl;
> > @@ -3382,7 +3387,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
> > flush_tlb_range(vma, start, end);
> > mmu_notifier_invalidate_range(mm, start, end);
> > i_mmap_unlock_write(vma->vm_file->f_mapping);
> > - mmu_notifier_invalidate_range_end(mm, start, end);
> > + mmu_notifier_invalidate_range_end(mm, start, end, MMU_MPROT);
> >
> > return pages << h->order;
> > }
> > diff --git a/mm/ksm.c b/mm/ksm.c
> > index d247efa..8c3a892 100644
> > --- a/mm/ksm.c
> > +++ b/mm/ksm.c
> > @@ -872,7 +872,8 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
> >
> > mmun_start = addr;
> > mmun_end = addr + PAGE_SIZE;
> > - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end,
> > + MMU_WRITE_PROTECT);
> >
> > ptep = page_check_address(page, mm, addr, &ptl, 0);
> > if (!ptep)
> > @@ -904,7 +905,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
> > if (pte_dirty(entry))
> > set_page_dirty(page);
> > entry = pte_mkclean(pte_wrprotect(entry));
> > - set_pte_at_notify(mm, addr, ptep, entry);
> > + set_pte_at_notify(mm, addr, ptep, entry, MMU_WRITE_PROTECT);
> > }
> > *orig_pte = *ptep;
> > err = 0;
> > @@ -912,7 +913,8 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
> > out_unlock:
> > pte_unmap_unlock(ptep, ptl);
> > out_mn:
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end,
> > + MMU_WRITE_PROTECT);
> > out:
> > return err;
> > }
> > @@ -948,7 +950,8 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
> >
> > mmun_start = addr;
> > mmun_end = addr + PAGE_SIZE;
> > - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end,
> > + MMU_MIGRATE);
> >
> > ptep = pte_offset_map_lock(mm, pmd, addr, &ptl);
> > if (!pte_same(*ptep, orig_pte)) {
> > @@ -961,7 +964,9 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
> >
> > flush_cache_page(vma, addr, pte_pfn(*ptep));
> > ptep_clear_flush_notify(vma, addr, ptep);
> > - set_pte_at_notify(mm, addr, ptep, mk_pte(kpage, vma->vm_page_prot));
> > + set_pte_at_notify(mm, addr, ptep,
> > + mk_pte(kpage, vma->vm_page_prot),
> > + MMU_MIGRATE);
> >
> > page_remove_rmap(page);
> > if (!page_mapped(page))
> > @@ -971,7 +976,8 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
> > pte_unmap_unlock(ptep, ptl);
> > err = 0;
> > out_mn:
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end,
> > + MMU_MIGRATE);
> > out:
> > return err;
> > }
> > diff --git a/mm/madvise.c b/mm/madvise.c
> > index 6fc9b82..d7ac37a 100644
> > --- a/mm/madvise.c
> > +++ b/mm/madvise.c
> > @@ -376,9 +376,9 @@ static int madvise_free_single_vma(struct vm_area_struct *vma,
> > tlb_gather_mmu(&tlb, mm, start, end);
> > update_hiwater_rss(mm);
> >
> > - mmu_notifier_invalidate_range_start(mm, start, end);
> > + mmu_notifier_invalidate_range_start(mm, start, end, MMU_MUNMAP);
> > madvise_free_page_range(&tlb, vma, start, end);
> > - mmu_notifier_invalidate_range_end(mm, start, end);
> > + mmu_notifier_invalidate_range_end(mm, start, end, MMU_MUNMAP);
> > tlb_finish_mmu(&tlb, start, end);
> >
> > return 0;
> > diff --git a/mm/memory.c b/mm/memory.c
> > index eacfafc..c184ee9 100644
> > --- a/mm/memory.c
> > +++ b/mm/memory.c
> > @@ -1050,7 +1050,7 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
> > mmun_end = end;
> > if (is_cow)
> > mmu_notifier_invalidate_range_start(src_mm, mmun_start,
> > - mmun_end);
> > + mmun_end, MMU_MIGRATE);
> >
> > ret = 0;
> > dst_pgd = pgd_offset(dst_mm, addr);
> > @@ -1067,7 +1067,8 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
> > } while (dst_pgd++, src_pgd++, addr = next, addr != end);
> >
> > if (is_cow)
> > - mmu_notifier_invalidate_range_end(src_mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(src_mm, mmun_start, mmun_end,
> > + MMU_MIGRATE);
> > return ret;
> > }
> >
> > @@ -1360,10 +1361,12 @@ void unmap_vmas(struct mmu_gather *tlb,
> > {
> > struct mm_struct *mm = vma->vm_mm;
> >
> > - mmu_notifier_invalidate_range_start(mm, start_addr, end_addr);
> > + mmu_notifier_invalidate_range_start(mm, start_addr,
> > + end_addr, MMU_MUNMAP);
> > for ( ; vma && vma->vm_start < end_addr; vma = vma->vm_next)
> > unmap_single_vma(tlb, vma, start_addr, end_addr, NULL);
> > - mmu_notifier_invalidate_range_end(mm, start_addr, end_addr);
> > + mmu_notifier_invalidate_range_end(mm, start_addr,
> > + end_addr, MMU_MUNMAP);
> > }
> >
> > /**
> > @@ -1385,10 +1388,10 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start,
> > lru_add_drain();
> > tlb_gather_mmu(&tlb, mm, start, end);
> > update_hiwater_rss(mm);
> > - mmu_notifier_invalidate_range_start(mm, start, end);
> > + mmu_notifier_invalidate_range_start(mm, start, end, MMU_MIGRATE);
> > for ( ; vma && vma->vm_start < end; vma = vma->vm_next)
> > unmap_single_vma(&tlb, vma, start, end, details);
> > - mmu_notifier_invalidate_range_end(mm, start, end);
> > + mmu_notifier_invalidate_range_end(mm, start, end, MMU_MIGRATE);
> > tlb_finish_mmu(&tlb, start, end);
> > }
> >
> > @@ -1411,9 +1414,9 @@ static void zap_page_range_single(struct vm_area_struct *vma, unsigned long addr
> > lru_add_drain();
> > tlb_gather_mmu(&tlb, mm, address, end);
> > update_hiwater_rss(mm);
> > - mmu_notifier_invalidate_range_start(mm, address, end);
> > + mmu_notifier_invalidate_range_start(mm, address, end, MMU_MUNMAP);
> > unmap_single_vma(&tlb, vma, address, end, details);
> > - mmu_notifier_invalidate_range_end(mm, address, end);
> > + mmu_notifier_invalidate_range_end(mm, address, end, MMU_MUNMAP);
> > tlb_finish_mmu(&tlb, address, end);
> > }
> >
> > @@ -2198,7 +2201,8 @@ gotten:
> >
> > mmun_start = address & PAGE_MASK;
> > mmun_end = mmun_start + PAGE_SIZE;
> > - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_start(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> >
> > /*
> > * Re-check the pte - we dropped the lock
> > @@ -2230,7 +2234,7 @@ gotten:
> > * mmu page tables (such as kvm shadow page tables), we want the
> > * new page to be mapped directly into the secondary page table.
> > */
> > - set_pte_at_notify(mm, address, page_table, entry);
> > + set_pte_at_notify(mm, address, page_table, entry, MMU_MIGRATE);
> > update_mmu_cache(vma, address, page_table);
> > if (old_page) {
> > /*
> > @@ -2269,7 +2273,8 @@ gotten:
> > unlock:
> > pte_unmap_unlock(page_table, ptl);
> > if (mmun_end > mmun_start)
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> > if (old_page) {
> > /*
> > * Don't let another task, with possibly unlocked vma,
> > diff --git a/mm/migrate.c b/mm/migrate.c
> > index 344cdf6..254d5bf 100644
> > --- a/mm/migrate.c
> > +++ b/mm/migrate.c
> > @@ -1801,12 +1801,14 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
> > WARN_ON(PageLRU(new_page));
> >
> > /* Recheck the target PMD */
> > - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_start(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> > ptl = pmd_lock(mm, pmd);
> > if (unlikely(!pmd_same(*pmd, entry) || page_count(page) != 2)) {
> > fail_putback:
> > spin_unlock(ptl);
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> >
> > /* Reverse changes made by migrate_page_copy() */
> > if (TestClearPageActive(new_page))
> > @@ -1860,7 +1862,8 @@ fail_putback:
> > page_remove_rmap(page);
> >
> > spin_unlock(ptl);
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> >
> > /* Take an "isolate" reference and put new page on the LRU. */
> > get_page(new_page);
> > diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
> > index 3b9b3d0..e51ea02 100644
> > --- a/mm/mmu_notifier.c
> > +++ b/mm/mmu_notifier.c
> > @@ -142,8 +142,10 @@ int __mmu_notifier_test_young(struct mm_struct *mm,
> > return young;
> > }
> >
> > -void __mmu_notifier_change_pte(struct mm_struct *mm, unsigned long address,
> > - pte_t pte)
> > +void __mmu_notifier_change_pte(struct mm_struct *mm,
> > + unsigned long address,
> > + pte_t pte,
> > + enum mmu_event event)
> > {
> > struct mmu_notifier *mn;
> > int id;
> > @@ -151,13 +153,14 @@ void __mmu_notifier_change_pte(struct mm_struct *mm, unsigned long address,
> > id = srcu_read_lock(&srcu);
> > hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) {
> > if (mn->ops->change_pte)
> > - mn->ops->change_pte(mn, mm, address, pte);
> > + mn->ops->change_pte(mn, mm, address, pte, event);
> > }
> > srcu_read_unlock(&srcu, id);
> > }
> >
> > void __mmu_notifier_invalidate_page(struct mm_struct *mm,
> > - unsigned long address)
> > + unsigned long address,
> > + enum mmu_event event)
> > {
> > struct mmu_notifier *mn;
> > int id;
> > @@ -165,13 +168,16 @@ void __mmu_notifier_invalidate_page(struct mm_struct *mm,
> > id = srcu_read_lock(&srcu);
> > hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) {
> > if (mn->ops->invalidate_page)
> > - mn->ops->invalidate_page(mn, mm, address);
> > + mn->ops->invalidate_page(mn, mm, address, event);
> > }
> > srcu_read_unlock(&srcu, id);
> > }
> >
> > void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
> > - unsigned long start, unsigned long end)
> > + unsigned long start,
> > + unsigned long end,
> > + enum mmu_event event)
> > +
> > {
> > struct mmu_notifier *mn;
> > int id;
> > @@ -179,14 +185,17 @@ void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
> > id = srcu_read_lock(&srcu);
> > hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) {
> > if (mn->ops->invalidate_range_start)
> > - mn->ops->invalidate_range_start(mn, mm, start, end);
> > + mn->ops->invalidate_range_start(mn, mm, start,
> > + end, event);
> > }
> > srcu_read_unlock(&srcu, id);
> > }
> > EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_start);
> >
> > void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
> > - unsigned long start, unsigned long end)
> > + unsigned long start,
> > + unsigned long end,
> > + enum mmu_event event)
> > {
> > struct mmu_notifier *mn;
> > int id;
> > @@ -204,7 +213,8 @@ void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
> > if (mn->ops->invalidate_range)
> > mn->ops->invalidate_range(mn, mm, start, end);
> > if (mn->ops->invalidate_range_end)
> > - mn->ops->invalidate_range_end(mn, mm, start, end);
> > + mn->ops->invalidate_range_end(mn, mm, start,
> > + end, event);
> > }
> > srcu_read_unlock(&srcu, id);
> > }
> > diff --git a/mm/mprotect.c b/mm/mprotect.c
> > index ace9345..0f5dbfe 100644
> > --- a/mm/mprotect.c
> > +++ b/mm/mprotect.c
> > @@ -152,7 +152,8 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
> > /* invoke the mmu notifier if the pmd is populated */
> > if (!mni_start) {
> > mni_start = addr;
> > - mmu_notifier_invalidate_range_start(mm, mni_start, end);
> > + mmu_notifier_invalidate_range_start(mm, mni_start,
> > + end, MMU_MPROT);
> > }
> >
> > if (pmd_trans_huge(*pmd)) {
> > @@ -180,7 +181,8 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
> > } while (pmd++, addr = next, addr != end);
> >
> > if (mni_start)
> > - mmu_notifier_invalidate_range_end(mm, mni_start, end);
> > + mmu_notifier_invalidate_range_end(mm, mni_start, end,
> > + MMU_MPROT);
> >
> > if (nr_huge_updates)
> > count_vm_numa_events(NUMA_HUGE_PTE_UPDATES, nr_huge_updates);
> > diff --git a/mm/mremap.c b/mm/mremap.c
> > index 17fa018..1ede220 100644
> > --- a/mm/mremap.c
> > +++ b/mm/mremap.c
> > @@ -177,7 +177,8 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
> >
> > mmun_start = old_addr;
> > mmun_end = old_end;
> > - mmu_notifier_invalidate_range_start(vma->vm_mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_start(vma->vm_mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> >
> > for (; old_addr < old_end; old_addr += extent, new_addr += extent) {
> > cond_resched();
> > @@ -229,7 +230,8 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
> > if (likely(need_flush))
> > flush_tlb_range(vma, old_end-len, old_addr);
> >
> > - mmu_notifier_invalidate_range_end(vma->vm_mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(vma->vm_mm, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> >
> > return len + old_addr - old_end; /* how much done */
> > }
> > diff --git a/mm/rmap.c b/mm/rmap.c
> > index b404783..1d96644 100644
> > --- a/mm/rmap.c
> > +++ b/mm/rmap.c
> > @@ -869,7 +869,7 @@ static int page_mkclean_one(struct page *page, struct vm_area_struct *vma,
> > pte_unmap_unlock(pte, ptl);
> >
> > if (ret) {
> > - mmu_notifier_invalidate_page(mm, address);
> > + mmu_notifier_invalidate_page(mm, address, MMU_WRITE_BACK);
> > (*cleaned)++;
> > }
> > out:
> > @@ -1171,8 +1171,12 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
> > spinlock_t *ptl;
> > int ret = SWAP_AGAIN;
> > enum ttu_flags flags = (enum ttu_flags)arg;
> > + enum mmu_event event = MMU_MIGRATE;
> > int dirty = 0;
> >
> > + if (flags & TTU_MUNLOCK)
> > + event = MMU_MUNLOCK;
> > +
> > pte = page_check_address(page, mm, address, &ptl, 0);
> > if (!pte)
> > goto out;
> > @@ -1292,7 +1296,7 @@ discard:
> > out_unmap:
> > pte_unmap_unlock(pte, ptl);
> > if (ret != SWAP_FAIL && !(flags & TTU_MUNLOCK))
> > - mmu_notifier_invalidate_page(mm, address);
> > + mmu_notifier_invalidate_page(mm, address, event);
> > out:
> > return ret;
> >
> > @@ -1346,7 +1350,9 @@ out_mlock:
> > #define CLUSTER_MASK (~(CLUSTER_SIZE - 1))
> >
> > static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
> > - struct vm_area_struct *vma, struct page *check_page)
> > + struct vm_area_struct *vma,
> > + struct page *check_page,
> > + enum ttu_flags flags)
> > {
> > struct mm_struct *mm = vma->vm_mm;
> > pmd_t *pmd;
> > @@ -1360,6 +1366,10 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
> > unsigned long end;
> > int ret = SWAP_AGAIN;
> > int locked_vma = 0;
> > + enum mmu_event event = MMU_MIGRATE;
> > +
> > + if (flags & TTU_MUNLOCK)
> > + event = MMU_MUNLOCK;
> >
> > address = (vma->vm_start + cursor) & CLUSTER_MASK;
> > end = address + CLUSTER_SIZE;
> > @@ -1374,7 +1384,7 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
> >
> > mmun_start = address;
> > mmun_end = end;
> > - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end, event);
> >
> > /*
> > * If we can acquire the mmap_sem for read, and vma is VM_LOCKED,
> > @@ -1443,7 +1453,7 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
> > (*mapcount)--;
> > }
> > pte_unmap_unlock(pte - 1, ptl);
> > - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
> > + mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end, event);
> > if (locked_vma)
> > up_read(&vma->vm_mm->mmap_sem);
> > return ret;
> > @@ -1499,7 +1509,9 @@ static int try_to_unmap_nonlinear(struct page *page,
> > while (cursor < max_nl_cursor &&
> > cursor < vma->vm_end - vma->vm_start) {
> > if (try_to_unmap_cluster(cursor, &mapcount,
> > - vma, page) == SWAP_MLOCK)
> > + vma, page,
> > + (enum ttu_flags)arg)
> > + == SWAP_MLOCK)
> > ret = SWAP_MLOCK;
> > cursor += CLUSTER_SIZE;
> > vma->vm_private_data = (void *) cursor;
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index 1cc6e2e..bee9357 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -254,7 +254,8 @@ static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
> >
> > static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > - unsigned long address)
> > + unsigned long address,
> > + enum mmu_event event)
> > {
> > struct kvm *kvm = mmu_notifier_to_kvm(mn);
> > int need_tlb_flush, idx;
> > @@ -296,7 +297,8 @@ static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
> > static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > unsigned long address,
> > - pte_t pte)
> > + pte_t pte,
> > + enum mmu_event event)
> > {
> > struct kvm *kvm = mmu_notifier_to_kvm(mn);
> > int idx;
> > @@ -312,7 +314,8 @@ static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
> > static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > unsigned long start,
> > - unsigned long end)
> > + unsigned long end,
> > + enum mmu_event event)
> > {
> > struct kvm *kvm = mmu_notifier_to_kvm(mn);
> > int need_tlb_flush = 0, idx;
> > @@ -338,7 +341,8 @@ static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
> > static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > unsigned long start,
> > - unsigned long end)
> > + unsigned long end,
> > + enum mmu_event event)
> > {
> > struct kvm *kvm = mmu_notifier_to_kvm(mn);
> >
> >
>
> Hi Jerome,
>
> I have a question:
> Don't you need to add the "enum mmu_event event" to the new
> __mmu_notifier_invalidate_range() and to (*invalidate_range)() as well ?
>
> Those new functions were merged to 3.19.
No, well i have no use for invalidate_range() thus i did not add it there.
But if you think you might have a need for that information inside the
invalidate_range() callback then it can easily be added.
Cheers,
Jérôme
>
> Oded
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