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Date: Mon, 30 Jun 2014 12:00:37 -0400
From: Jerome Glisse <j.glisse@...il.com>
To: John Hubbard <jhubbard@...dia.com>
Cc: akpm@...ux-foundation.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, mgorman@...e.de, hpa@...or.com,
peterz@...raread.org, aarcange@...hat.com, riel@...hat.com,
jweiner@...hat.com, torvalds@...ux-foundation.org,
Mark Hairgrove <mhairgrove@...dia.com>,
Jatin Kumar <jakumar@...dia.com>,
Subhash Gutti <sgutti@...dia.com>,
Lucien Dunning <ldunning@...dia.com>,
Cameron Buschardt <cabuschardt@...dia.com>,
Arvind Gopalakrishnan <arvindg@...dia.com>,
Sherry Cheung <SCheung@...dia.com>,
Duncan Poole <dpoole@...dia.com>,
Oded Gabbay <Oded.Gabbay@....com>,
Alexander Deucher <Alexander.Deucher@....com>,
Andrew Lewycky <Andrew.Lewycky@....com>,
Jérôme Glisse <jglisse@...hat.com>
Subject: Re: [PATCH 4/6] mmu_notifier: pass through vma to invalidate_range
and invalidate_page
On Sun, Jun 29, 2014 at 08:29:01PM -0700, John Hubbard wrote:
> On Fri, 27 Jun 2014, Jérôme Glisse wrote:
>
> > From: Jérôme Glisse <jglisse@...hat.com>
> >
> > New user of the mmu_notifier interface need to lookup vma in order to
> > perform the invalidation operation. Instead of redoing a vma lookup
> > inside the callback just pass through the vma from the call site where
> > it is already available.
> >
> > This needs small refactoring in memory.c to call invalidate_range on
> > vma boundary the overhead should be low enough.
> >
> > Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
> > ---
> > drivers/gpu/drm/i915/i915_gem_userptr.c | 1 +
> > drivers/iommu/amd_iommu_v2.c | 3 +++
> > drivers/misc/sgi-gru/grutlbpurge.c | 6 ++++-
> > drivers/xen/gntdev.c | 4 +++-
> > fs/proc/task_mmu.c | 16 ++++++++-----
> > include/linux/mmu_notifier.h | 19 ++++++++++++---
> > kernel/events/uprobes.c | 4 ++--
> > mm/filemap_xip.c | 3 ++-
> > mm/huge_memory.c | 26 ++++++++++----------
> > mm/hugetlb.c | 16 ++++++-------
> > mm/ksm.c | 8 +++----
> > mm/memory.c | 42 +++++++++++++++++++++------------
> > mm/migrate.c | 6 ++---
> > mm/mmu_notifier.c | 9 ++++---
> > mm/mprotect.c | 5 ++--
> > mm/mremap.c | 4 ++--
> > mm/rmap.c | 9 +++----
> > virt/kvm/kvm_main.c | 3 +++
> > 18 files changed, 116 insertions(+), 68 deletions(-)
> >
>
> Hi Jerome, considering that you have to change every call site already, it
> seems to me that it would be ideal to just delete the mm argument from all
> of these invalidate_range* callbacks. In other words, replace the mm
> argument with the new vma argument. I don't see much point in passing
> them both around, and while it would make the patch a *bit* larger, it's
> mostly just an extra line or two per call site:
>
> mm = vma->vm_mm;
Yes probably is.
>
> Also, passing the vma around really does seem like a good approach, but it
> does cause a bunch of additional calls to the invalidate_range* routines,
> because we generate a call per vma, instead of just one for the entire mm.
> So that brings up a couple questions:
>
> 1) Is there any chance that this could cause measurable performance
> regressions?
>
> 2) Should you put a little note in the commit message, mentioning this
> point?
>
I pointed that out in my introduction mail to the patchset. I think those
code path are mostly use during process destruction and hence is fine but
at same time being able to spin and destroy quickly many process by be
considered a features and an important use case that should not regress.
> > diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
> > index ed6f35e..191ac71 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_userptr.c
> > +++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
> > @@ -55,6 +55,7 @@ struct i915_mmu_object {
> >
> > static void i915_gem_userptr_mn_invalidate_range_start(struct mmu_notifier *_mn,
> > struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event)
>
> That routine has a local variable named vma, so it might be polite to
> rename the local variable, to make it more obvious to the reader that they
> are different. Of course, since the compiler knows which is which, feel
> free to ignore this comment.
>
> > diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
> > index 2bb9771..9f9e706 100644
> > --- a/drivers/iommu/amd_iommu_v2.c
> > +++ b/drivers/iommu/amd_iommu_v2.c
> > @@ -422,6 +422,7 @@ static void mn_change_pte(struct mmu_notifier *mn,
> >
> > static void mn_invalidate_page(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long address,
> > enum mmu_event event)
> > {
> > @@ -430,6 +431,7 @@ static void mn_invalidate_page(struct mmu_notifier *mn,
> >
> > static void mn_invalidate_range_start(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event)
> > @@ -453,6 +455,7 @@ static void mn_invalidate_range_start(struct mmu_notifier *mn,
> >
> > static void mn_invalidate_range_end(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event)
> > diff --git a/drivers/misc/sgi-gru/grutlbpurge.c b/drivers/misc/sgi-gru/grutlbpurge.c
> > index e67fed1..d02e4c7 100644
> > --- a/drivers/misc/sgi-gru/grutlbpurge.c
> > +++ b/drivers/misc/sgi-gru/grutlbpurge.c
> > @@ -221,6 +221,7 @@ void gru_flush_all_tlb(struct gru_state *gru)
> > */
> > static void gru_invalidate_range_start(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start, unsigned long end,
> > enum mmu_event event)
> > {
> > @@ -235,7 +236,9 @@ 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,
> > + struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > + unsigned long start,
> > unsigned long end,
> > enum mmu_event event)
> > {
> > @@ -250,6 +253,7 @@ static void gru_invalidate_range_end(struct mmu_notifier *mn,
> > }
> >
> > static void gru_invalidate_page(struct mmu_notifier *mn, struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long address,
> > enum mmu_event event)
> > {
> > diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
> > index fe9da94..219928b 100644
> > --- a/drivers/xen/gntdev.c
> > +++ b/drivers/xen/gntdev.c
> > @@ -428,6 +428,7 @@ static void unmap_if_in_range(struct grant_map *map,
> >
> > static void mn_invl_range_start(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event)
> > @@ -447,10 +448,11 @@ static void mn_invl_range_start(struct mmu_notifier *mn,
> >
> > static void mn_invl_page(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long address,
> > enum mmu_event event)
> > {
> > - mn_invl_range_start(mn, mm, address, address + PAGE_SIZE, event);
> > + mn_invl_range_start(mn, mm, vma, 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 e9e79f7..8b0f25d 100644
> > --- a/fs/proc/task_mmu.c
> > +++ b/fs/proc/task_mmu.c
> > @@ -829,13 +829,15 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
> > .private = &cp,
> > };
> > down_read(&mm->mmap_sem);
> > - if (type == CLEAR_REFS_SOFT_DIRTY)
> > - mmu_notifier_invalidate_range_start(mm, 0,
> > - -1, MMU_STATUS);
> > for (vma = mm->mmap; vma; vma = vma->vm_next) {
> > cp.vma = vma;
> > if (is_vm_hugetlb_page(vma))
> > continue;
> > + if (type == CLEAR_REFS_SOFT_DIRTY)
> > + mmu_notifier_invalidate_range_start(mm, vma,
> > + vma->vm_start,
> > + vma->vm_end,
> > + MMU_STATUS);
> > /*
> > * Writing 1 to /proc/pid/clear_refs affects all pages.
> > *
> > @@ -857,10 +859,12 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
> > }
> > walk_page_range(vma->vm_start, vma->vm_end,
> > &clear_refs_walk);
> > + if (type == CLEAR_REFS_SOFT_DIRTY)
> > + mmu_notifier_invalidate_range_end(mm, vma,
> > + vma->vm_start,
> > + vma->vm_end,
> > + MMU_STATUS);
> > }
> > - if (type == CLEAR_REFS_SOFT_DIRTY)
> > - mmu_notifier_invalidate_range_end(mm, 0,
> > - -1, MMU_STATUS);
> > 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 82e9577..8907e5d 100644
> > --- a/include/linux/mmu_notifier.h
> > +++ b/include/linux/mmu_notifier.h
> > @@ -137,6 +137,7 @@ struct mmu_notifier_ops {
> > */
> > void (*invalidate_page)(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long address,
> > enum mmu_event event);
> >
> > @@ -185,11 +186,13 @@ struct mmu_notifier_ops {
> > */
> > void (*invalidate_range_start)(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event);
> > void (*invalidate_range_end)(struct mmu_notifier *mn,
> > struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event);
> > @@ -233,13 +236,16 @@ extern void __mmu_notifier_change_pte(struct mm_struct *mm,
> > pte_t pte,
> > enum mmu_event event);
> > extern void __mmu_notifier_invalidate_page(struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long address,
> > enum mmu_event event);
> > extern void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event);
> > extern void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event);
> > @@ -276,29 +282,33 @@ static inline void mmu_notifier_change_pte(struct mm_struct *mm,
> > }
> >
> > static inline void mmu_notifier_invalidate_page(struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long address,
> > enum mmu_event event)
> > {
> > if (mm_has_notifiers(mm))
> > - __mmu_notifier_invalidate_page(mm, address, event);
> > + __mmu_notifier_invalidate_page(mm, vma, address, event);
> > }
> >
> > static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event)
> > {
> > if (mm_has_notifiers(mm))
> > - __mmu_notifier_invalidate_range_start(mm, start, end, event);
> > + __mmu_notifier_invalidate_range_start(mm, vma, start,
> > + end, event);
> > }
> >
> > static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event)
> > {
> > if (mm_has_notifiers(mm))
> > - __mmu_notifier_invalidate_range_end(mm, start, end, event);
> > + __mmu_notifier_invalidate_range_end(mm, vma, start, end, event);
> > }
> >
> > static inline void mmu_notifier_mm_init(struct mm_struct *mm)
> > @@ -380,12 +390,14 @@ static inline void mmu_notifier_change_pte(struct mm_struct *mm,
> > }
> >
> > static inline void mmu_notifier_invalidate_page(struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long address,
> > enum mmu_event event)
> > {
> > }
> >
> > static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event)
> > @@ -393,6 +405,7 @@ static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm,
> > }
> >
> > static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event)
> > diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> > index 296f81e..0f552bc 100644
> > --- a/kernel/events/uprobes.c
> > +++ b/kernel/events/uprobes.c
> > @@ -177,7 +177,7 @@ 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,
> > + mmu_notifier_invalidate_range_start(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> > err = -EAGAIN;
> > ptep = page_check_address(page, mm, addr, &ptl, 0);
> > @@ -212,7 +212,7 @@ 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,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> > unlock_page(page);
> > return err;
> > diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
> > index a2b3f09..f0113df 100644
> > --- a/mm/filemap_xip.c
> > +++ b/mm/filemap_xip.c
> > @@ -198,7 +198,8 @@ 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_MIGRATE);
> > + mmu_notifier_invalidate_page(mm, vma, address,
> > + MMU_MIGRATE);
> > page_cache_release(page);
> > }
> > }
> > diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> > index fa30857..cc74b60 100644
> > --- a/mm/huge_memory.c
> > +++ b/mm/huge_memory.c
> > @@ -1022,7 +1022,7 @@ 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,
> > + mmu_notifier_invalidate_range_start(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> >
> > for (i = 0; i < HPAGE_PMD_NR; i++) {
> > @@ -1064,7 +1064,7 @@ 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,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> >
> > ret |= VM_FAULT_WRITE;
> > @@ -1075,7 +1075,7 @@ out:
> >
> > out_free_pages:
> > spin_unlock(ptl);
> > - mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> > for (i = 0; i < HPAGE_PMD_NR; i++) {
> > memcg = (void *)page_private(pages[i]);
> > @@ -1162,7 +1162,7 @@ alloc:
> >
> > mmun_start = haddr;
> > mmun_end = haddr + HPAGE_PMD_SIZE;
> > - mmu_notifier_invalidate_range_start(mm, mmun_start,
> > + mmu_notifier_invalidate_range_start(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> >
> > if (!page)
> > @@ -1201,7 +1201,7 @@ alloc:
> > }
> > spin_unlock(ptl);
> > out_mn:
> > - mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> > out:
> > return ret;
> > @@ -1637,7 +1637,7 @@ 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,
> > + mmu_notifier_invalidate_range_start(mm, vma, mmun_start,
> > mmun_end, MMU_STATUS);
> > pmd = page_check_address_pmd(page, mm, address,
> > PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG, &ptl);
> > @@ -1653,7 +1653,7 @@ static int __split_huge_page_splitting(struct page *page,
> > ret = 1;
> > spin_unlock(ptl);
> > }
> > - mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_STATUS);
> >
> > return ret;
> > @@ -2453,7 +2453,7 @@ 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,
> > + mmu_notifier_invalidate_range_start(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> > pmd_ptl = pmd_lock(mm, pmd); /* probably unnecessary */
> > /*
> > @@ -2464,7 +2464,7 @@ 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,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> >
> > spin_lock(pte_ptl);
> > @@ -2854,19 +2854,19 @@ 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,
> > + mmu_notifier_invalidate_range_start(mm, vma, 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,
> > + mmu_notifier_invalidate_range_end(mm, vma, 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,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> > return;
> > }
> > @@ -2874,7 +2874,7 @@ again:
> > VM_BUG_ON_PAGE(!page_count(page), page);
> > get_page(page);
> > spin_unlock(ptl);
> > - mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> >
> > split_huge_page(page);
> > diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> > index 73e1576..15f0123 100644
> > --- a/mm/hugetlb.c
> > +++ b/mm/hugetlb.c
> > @@ -2565,7 +2565,7 @@ 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,
> > + mmu_notifier_invalidate_range_start(src, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> >
> > for (addr = vma->vm_start; addr < vma->vm_end; addr += sz) {
> > @@ -2616,7 +2616,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
> > }
> >
> > if (cow)
> > - mmu_notifier_invalidate_range_end(src, mmun_start,
> > + mmu_notifier_invalidate_range_end(src, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> >
> > return ret;
> > @@ -2643,7 +2643,7 @@ 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,
> > + mmu_notifier_invalidate_range_start(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> > again:
> > for (address = start; address < end; address += sz) {
> > @@ -2715,7 +2715,7 @@ unlock:
> > if (address < end && !ref_page)
> > goto again;
> > }
> > - mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> > tlb_end_vma(tlb, vma);
> > }
> > @@ -2903,7 +2903,7 @@ 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,
> > + mmu_notifier_invalidate_range_start(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> > /*
> > * Retake the page table lock to check for racing updates
> > @@ -2924,7 +2924,7 @@ retry_avoidcopy:
> > new_page = old_page;
> > }
> > spin_unlock(ptl);
> > - mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> > page_cache_release(new_page);
> > page_cache_release(old_page);
> > @@ -3363,7 +3363,7 @@ 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, event);
> > + mmu_notifier_invalidate_range_start(mm, vma, start, end, event);
> > mutex_lock(&vma->vm_file->f_mapping->i_mmap_mutex);
> > for (; address < end; address += huge_page_size(h)) {
> > spinlock_t *ptl;
> > @@ -3393,7 +3393,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
> > */
> > flush_tlb_range(vma, start, end);
> > mutex_unlock(&vma->vm_file->f_mapping->i_mmap_mutex);
> > - mmu_notifier_invalidate_range_end(mm, start, end, event);
> > + mmu_notifier_invalidate_range_end(mm, vma, start, end, event);
> >
> > return pages << h->order;
> > }
> > diff --git a/mm/ksm.c b/mm/ksm.c
> > index 4b659f1..1f3c4d7 100644
> > --- a/mm/ksm.c
> > +++ b/mm/ksm.c
> > @@ -873,7 +873,7 @@ 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,
> > + mmu_notifier_invalidate_range_start(mm, vma, mmun_start,
> > mmun_end, MMU_MPROT_RONLY);
> >
> > ptep = page_check_address(page, mm, addr, &ptl, 0);
> > @@ -914,7 +914,7 @@ 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,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_MPROT_RONLY);
> > out:
> > return err;
> > @@ -951,7 +951,7 @@ 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,
> > + mmu_notifier_invalidate_range_start(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> >
> > ptep = pte_offset_map_lock(mm, pmd, addr, &ptl);
> > @@ -977,7 +977,7 @@ 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,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> > out:
> > return err;
> > diff --git a/mm/memory.c b/mm/memory.c
> > index d3908f0..4717579 100644
> > --- a/mm/memory.c
> > +++ b/mm/memory.c
> > @@ -1049,7 +1049,7 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
> > mmun_start = addr;
> > mmun_end = end;
> > if (is_cow)
> > - mmu_notifier_invalidate_range_start(src_mm, mmun_start,
> > + mmu_notifier_invalidate_range_start(src_mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> >
> > ret = 0;
> > @@ -1067,8 +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_MIGRATE);
> > + mmu_notifier_invalidate_range_end(src_mm, vma, mmun_start,
> > + mmun_end, MMU_MIGRATE);
> > return ret;
> > }
> >
> > @@ -1372,12 +1372,17 @@ 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_MUNMAP);
> > - for ( ; vma && vma->vm_start < end_addr; vma = vma->vm_next)
> > + for ( ; vma && vma->vm_start < end_addr; vma = vma->vm_next) {
> > + mmu_notifier_invalidate_range_start(mm, vma,
> > + max(start_addr, vma->vm_start),
> > + min(end_addr, vma->vm_end),
> > + MMU_MUNMAP);
> > unmap_single_vma(tlb, vma, start_addr, end_addr, NULL);
> > - mmu_notifier_invalidate_range_end(mm, start_addr,
> > - end_addr, MMU_MUNMAP);
> > + mmu_notifier_invalidate_range_end(mm, vma,
> > + max(start_addr, vma->vm_start),
> > + min(end_addr, vma->vm_end),
> > + MMU_MUNMAP);
> > + }
> > }
> >
> > /**
> > @@ -1399,10 +1404,17 @@ 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_MUNMAP);
> > - for ( ; vma && vma->vm_start < end; vma = vma->vm_next)
> > + for ( ; vma && vma->vm_start < end; vma = vma->vm_next) {
> > + mmu_notifier_invalidate_range_start(mm, vma,
> > + max(start, vma->vm_start),
> > + min(end, vma->vm_end),
> > + MMU_MUNMAP);
> > unmap_single_vma(&tlb, vma, start, end, details);
> > - mmu_notifier_invalidate_range_end(mm, start, end, MMU_MUNMAP);
> > + mmu_notifier_invalidate_range_end(mm, vma,
> > + max(start, vma->vm_start),
> > + min(end, vma->vm_end),
> > + MMU_MUNMAP);
> > + }
> > tlb_finish_mmu(&tlb, start, end);
> > }
> >
> > @@ -1425,9 +1437,9 @@ 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_MUNMAP);
> > + mmu_notifier_invalidate_range_start(mm, vma, address, end, MMU_MUNMAP);
> > unmap_single_vma(&tlb, vma, address, end, details);
> > - mmu_notifier_invalidate_range_end(mm, address, end, MMU_MUNMAP);
> > + mmu_notifier_invalidate_range_end(mm, vma, address, end, MMU_MUNMAP);
> > tlb_finish_mmu(&tlb, address, end);
> > }
> >
> > @@ -2211,7 +2223,7 @@ gotten:
> >
> > mmun_start = address & PAGE_MASK;
> > mmun_end = mmun_start + PAGE_SIZE;
> > - mmu_notifier_invalidate_range_start(mm, mmun_start,
> > + mmu_notifier_invalidate_range_start(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> >
> > /*
> > @@ -2283,7 +2295,7 @@ gotten:
> > unlock:
> > pte_unmap_unlock(page_table, ptl);
> > if (mmun_end > mmun_start)
> > - mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> > if (old_page) {
> > /*
> > diff --git a/mm/migrate.c b/mm/migrate.c
> > index b526c72..0c61aa9 100644
> > --- a/mm/migrate.c
> > +++ b/mm/migrate.c
> > @@ -1820,13 +1820,13 @@ 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,
> > + mmu_notifier_invalidate_range_start(mm, vma, 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,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> >
> > /* Reverse changes made by migrate_page_copy() */
> > @@ -1880,7 +1880,7 @@ fail_putback:
> > page_remove_rmap(page);
> >
> > spin_unlock(ptl);
> > - mmu_notifier_invalidate_range_end(mm, mmun_start,
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> >
> > /* Take an "isolate" reference and put new page on the LRU. */
> > diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
> > index 9decb88..87e6bc5 100644
> > --- a/mm/mmu_notifier.c
> > +++ b/mm/mmu_notifier.c
> > @@ -139,6 +139,7 @@ void __mmu_notifier_change_pte(struct mm_struct *mm,
> > }
> >
> > void __mmu_notifier_invalidate_page(struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long address,
> > enum mmu_event event)
> > {
> > @@ -148,12 +149,13 @@ 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, event);
> > + mn->ops->invalidate_page(mn, mm, vma, address, event);
> > }
> > srcu_read_unlock(&srcu, id);
> > }
> >
> > void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event)
> > @@ -165,7 +167,7 @@ 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,
> > + mn->ops->invalidate_range_start(mn, vma, mm, start,
> > end, event);
> > }
> > srcu_read_unlock(&srcu, id);
> > @@ -173,6 +175,7 @@ void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
> > EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_start);
> >
> > void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event)
> > @@ -183,7 +186,7 @@ void __mmu_notifier_invalidate_range_end(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_end)
> > - mn->ops->invalidate_range_end(mn, mm, start,
> > + mn->ops->invalidate_range_end(mn, vma, mm, start,
> > end, event);
> > }
> > srcu_read_unlock(&srcu, id);
> > diff --git a/mm/mprotect.c b/mm/mprotect.c
> > index 6ce6c23..16ce504 100644
> > --- a/mm/mprotect.c
> > +++ b/mm/mprotect.c
> > @@ -158,7 +158,7 @@ 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,
> > + mmu_notifier_invalidate_range_start(mm, vma, mni_start,
> > end, event);
> > }
> >
> > @@ -187,7 +187,8 @@ 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, event);
> > + mmu_notifier_invalidate_range_end(mm, vma, mni_start,
> > + end, event);
> >
> > 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 6827d2f..9bee6de 100644
> > --- a/mm/mremap.c
> > +++ b/mm/mremap.c
> > @@ -177,7 +177,7 @@ 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,
> > + mmu_notifier_invalidate_range_start(vma->vm_mm, vma, mmun_start,
> > mmun_end, MMU_MIGRATE);
> >
> > for (; old_addr < old_end; old_addr += extent, new_addr += extent) {
> > @@ -229,7 +229,7 @@ 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,
> > + mmu_notifier_invalidate_range_end(vma->vm_mm, vma, 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 bd7e6d7..f1be50d 100644
> > --- a/mm/rmap.c
> > +++ b/mm/rmap.c
> > @@ -840,7 +840,7 @@ 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_WB);
> > + mmu_notifier_invalidate_page(mm, vma, address, MMU_WB);
> > (*cleaned)++;
> > }
> > out:
> > @@ -1237,7 +1237,7 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
> > out_unmap:
> > pte_unmap_unlock(pte, ptl);
> > if (ret != SWAP_FAIL && !(flags & TTU_MUNLOCK))
> > - mmu_notifier_invalidate_page(mm, address, event);
> > + mmu_notifier_invalidate_page(mm, vma, address, event);
> > out:
> > return ret;
> >
> > @@ -1325,7 +1325,8 @@ 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, event);
> > + mmu_notifier_invalidate_range_start(mm, vma, mmun_start,
> > + mmun_end, event);
> >
> > /*
> > * If we can acquire the mmap_sem for read, and vma is VM_LOCKED,
> > @@ -1390,7 +1391,7 @@ 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, event);
> > + mmu_notifier_invalidate_range_end(mm, vma, mmun_start, mmun_end, event);
> > if (locked_vma)
> > up_read(&vma->vm_mm->mmap_sem);
> > return ret;
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index 6e1992f..c4b7bf9 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -262,6 +262,7 @@ 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,
> > + struct vm_area_struct *vma,
> > unsigned long address,
> > enum mmu_event event)
> > {
> > @@ -318,6 +319,7 @@ 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,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event)
> > @@ -345,6 +347,7 @@ 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,
> > + struct vm_area_struct *vma,
> > unsigned long start,
> > unsigned long end,
> > enum mmu_event event)
> > --
> > 1.9.0
> >
> > --
> > To unsubscribe, send a message with 'unsubscribe linux-mm' in
> > the body to majordomo@...ck.org. For more info on Linux MM,
> > see: http://www.linux-mm.org/ .
> > Don't email: <a href=mailto:"dont@...ck.org"> email@...ck.org </a>
> >
>
> Other than the refinements suggested above, I can't seem to find anything
> wrong with this patch, so:
>
> Reviewed-by: John Hubbard <jhubbard@...dia.com>
>
> thanks,
> John H.
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