[PATCH v4 45/66] acct: Use VMA iterator instead of linked list
From: Liam Howlett <hidden>
Date: 2021-12-01 14:37:28
Also in:
lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: "Liam R. Howlett" <redacted> The VMA iterator is faster than the linked list. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Liam R. Howlett <redacted> --- 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(¤t->sighand->siglock);
--
2.30.2