On 12/1/21 15:30, Liam Howlett wrote:
> From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
>
> Use the maple tree or VMA iterator instead. This is faster and will
> allow us to shrink the VMA.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
> Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
But I think some fixup needed:
> @@ -1456,12 +1458,14 @@ void exit_mmap(struct mm_struct *mm)
>
> mm->total_vm = 0;
>
> - while ((vma = mm->mmap)) {
> - mm->mmap = vma->vm_next;
> + mmap_write_lock(mm);
If locking was missing, should have been added sooner than now?
> + for_each_vma(vmi, vma) {
> delete_vma_from_mm(vma);
> delete_vma(mm, vma);
> cond_resched();
> }
> + __mt_destroy(&mm->mm_mt);
And this at the point mm_mt was added?
> + mmap_write_unlock(mm);
> }
>
> int vm_brk(unsigned long addr, unsigned long len)
