Re: [RFC v8 PATCH 3/5] mm: mmap: zap pages with read mmap_sem in munmap

[Matthew Wilcox]

On Wed, Aug 15, 2018 at 02:54:13PM -0700, Yang Shi wrote:
> 
> 
> On 8/15/18 2:09 PM, Matthew Wilcox wrote:
> > On Wed, Aug 15, 2018 at 12:16:06PM -0700, Matthew Wilcox wrote:
> > > (not even compiled, and I can see a good opportunity for combining the
> > > VM_LOCKED loop with the has_uprobes loop)
> > I was rushing to get that sent earlier.  Here it is tidied up to
> > actually compile.
> 
> Thanks for the example. Yes, I believe the code still can be compacted to
> save some lines. However, the cover letter and the commit log of this patch
> has elaborated the discussion in the earlier reviews about why we do it in
> this way.

You mean the other callers which need to hold mmap_sem write-locked for
longer?  I hadn't really considered those; how about this?

 mmap.c |   47 +++++++++++++++++++++++++++++------------------
 1 file changed, 29 insertions(+), 18 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index de699523c0b7..06dc31d1da8c 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2798,11 +2798,11 @@ int split_vma(struct mm_struct *mm, struct vm_area_struct *vma,
  * work.  This now handles partial unmappings.
  * Jeremy Fitzhardinge <jeremy@xxxxxxxx>
  */
-int do_munmap(struct mm_struct *mm, unsigned long start, size_t len,
-	      struct list_head *uf)
+static int __do_munmap(struct mm_struct *mm, unsigned long start, size_t len,
+	      struct list_head *uf, bool downgrade)
 {
 	unsigned long end;
-	struct vm_area_struct *vma, *prev, *last;
+	struct vm_area_struct *vma, *prev, *last, *tmp;
 
 	if ((offset_in_page(start)) || start > TASK_SIZE || len > TASK_SIZE-start)
 		return -EINVAL;
@@ -2816,7 +2816,7 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len,
 	if (!vma)
 		return 0;
 	prev = vma->vm_prev;
-	/* we have  start < vma->vm_end  */
+	/* we have start < vma->vm_end  */
 
 	/* if it doesn't overlap, we have nothing.. */
 	end = start + len;
@@ -2873,18 +2873,22 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len,
 
 	/*
 	 * unlock any mlock()ed ranges before detaching vmas
+	 * and check to see if there's any reason we might have to hold
+	 * the mmap_sem write-locked while unmapping regions.
 	 */
-	if (mm->locked_vm) {
-		struct vm_area_struct *tmp = vma;
-		while (tmp && tmp->vm_start < end) {
-			if (tmp->vm_flags & VM_LOCKED) {
-				mm->locked_vm -= vma_pages(tmp);
-				munlock_vma_pages_all(tmp);
-			}
-			tmp = tmp->vm_next;
+	for (tmp = vma; tmp && tmp->vm_start < end; tmp = tmp->vm_next) {
+		if (tmp->vm_flags & VM_LOCKED) {
+			mm->locked_vm -= vma_pages(tmp);
+			munlock_vma_pages_all(tmp);
 		}
+		if (tmp->vm_file &&
+				has_uprobes(tmp, tmp->vm_start, tmp->vm_end))
+			downgrade = false;
 	}
 
+	if (downgrade)
+		downgrade_write(&mm->mmap_sem);
+
 	/*
 	 * Remove the vma's, and unmap the actual pages
 	 */
@@ -2896,7 +2900,13 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len,
 	/* Fix up all other VM information */
 	remove_vma_list(mm, vma);
 
-	return 0;
+	return downgrade ? 1 : 0;
+}
+
+int do_unmap(struct mm_struct *mm, unsigned long start, size_t len,
+		struct list_head *uf)
+{
+	return __do_munmap(mm, start, len, uf, false);
 }
 
 int vm_munmap(unsigned long start, size_t len)
@@ -2905,11 +2915,12 @@ int vm_munmap(unsigned long start, size_t len)
 	struct mm_struct *mm = current->mm;
 	LIST_HEAD(uf);
 
-	if (down_write_killable(&mm->mmap_sem))
-		return -EINTR;
-
-	ret = do_munmap(mm, start, len, &uf);
-	up_write(&mm->mmap_sem);
+	down_write(&mm->mmap_sem);
+	ret = __do_munmap(mm, start, len, &uf, true);
+	if (ret == 1)
+		up_read(&mm->mmap_sem);
+	else
+		up_write(&mm->mmap_sem);
 	userfaultfd_unmap_complete(mm, &uf);
 	return ret;
 }