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-rw-r--r--mm/khugepaged.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 1cd18e4347fe..b7e2268dfc9a 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1673,10 +1673,14 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
spin_unlock(&khugepaged_mm_lock);
mm = mm_slot->mm;
- down_read(&mm->mmap_sem);
- if (unlikely(khugepaged_test_exit(mm)))
- vma = NULL;
- else
+ /*
+ * Don't wait for semaphore (to avoid long wait times). Just move to
+ * the next mm on the list.
+ */
+ vma = NULL;
+ if (unlikely(!down_read_trylock(&mm->mmap_sem)))
+ goto breakouterloop_mmap_sem;
+ if (likely(!khugepaged_test_exit(mm)))
vma = find_vma(mm, khugepaged_scan.address);
progress++;