Commit 160c8200 authored Sep 06, 2022 by Matthew Wilcox (Oracle) Committed by Andrew Morton Sep 26, 2022

acct: use VMA iterator instead of linked list

The VMA iterator is faster than the linked list.

Link: https://lkml.kernel.org/r/20220906194824.2110408-47-Liam.Howlett@oracle.com


Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Tested-by: Yu Zhao <yuzhao@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

parent 01293a62

kernel/acct.c

+5 −6

Original line number	Diff line number	Diff line
		@@ -555,15 +555,14 @@ 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);