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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>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-09-06 19:48:58 +00:00 committed by Andrew Morton
parent 01293a62ba
commit 160c820023
1 changed files with 5 additions and 6 deletions
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11
kernel/acct.c
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@ -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);