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    Subject[PATCH v4 45/66] acct: Use VMA iterator instead of linked list
    Date
    From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>

    The VMA iterator is faster than the linked list.

    Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
    Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
    ---
    kernel/acct.c | 11 +++++------
    1 file changed, 5 insertions(+), 6 deletions(-)

    diff --git a/kernel/acct.c b/kernel/acct.c
    index 3df53cf1dcd5..2e7bf8d41f04 100644
    --- a/kernel/acct.c
    +++ b/kernel/acct.c
    @@ -535,15 +535,14 @@ void acct_collect(long exitcode, int group_dead)
    unsigned long vsize = 0;

    if (group_dead && current->mm) {
    + struct mm_struct *mm = current->mm;
    + VMA_ITERATOR(vmi, mm, 0);
    struct vm_area_struct *vma;

    - mmap_read_lock(current->mm);
    - vma = current->mm->mmap;
    - while (vma) {
    + mmap_read_lock(mm);
    + for_each_vma(vmi, vma)
    vsize += vma->vm_end - vma->vm_start;
    - vma = vma->vm_next;
    - }
    - mmap_read_unlock(current->mm);
    + mmap_read_unlock(mm);
    }

    spin_lock_irq(&current->sighand->siglock);
    --
    2.30.2
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