diff options
| -rw-r--r-- | mm/filemap.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index d1fb0b12bff2..1a388b11cfa9 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -3323,9 +3323,17 @@ static struct file *do_async_mmap_readahead(struct vm_fault *vmf, if (vmf->vma->vm_flags & VM_RAND_READ || !ra->ra_pages) return fpin; - mmap_miss = READ_ONCE(ra->mmap_miss); - if (mmap_miss) - WRITE_ONCE(ra->mmap_miss, --mmap_miss); + /* + * If the folio is locked, we're likely racing against another fault. + * Don't touch the mmap_miss counter to avoid decreasing it multiple + * times for a single folio and break the balance with mmap_miss + * increase in do_sync_mmap_readahead(). + */ + if (likely(!folio_test_locked(folio))) { + mmap_miss = READ_ONCE(ra->mmap_miss); + if (mmap_miss) + WRITE_ONCE(ra->mmap_miss, --mmap_miss); + } if (folio_test_readahead(folio)) { fpin = maybe_unlock_mmap_for_io(vmf, fpin); |