diff options
| author | Mark Brown <broonie@kernel.org> | 2018-06-01 11:40:46 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2018-06-01 11:40:46 +0100 |
| commit | 1e82572e5f806782cc1bf06e6d22905c28b0a9f5 (patch) | |
| tree | c428a640fca2ee5c6bfe259482b941f5e0ece927 /mm/khugepaged.c | |
| parent | 29e8549d35499289ce6211a553f956a2ab9a3905 (diff) | |
| parent | 86a04ba0955e3c806ed301cf178f1e130f1cb785 (diff) | |
Merge branch 'linux-linaro-lsk-v4.9' into linux-linaro-lsk-v4.9-rtlsk-v4.9-18.05-rt
Diffstat (limited to 'mm/khugepaged.c')
| -rw-r--r-- | mm/khugepaged.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 898eb26f5dc8..1df37ee996d5 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -963,7 +963,9 @@ static void collapse_huge_page(struct mm_struct *mm, goto out_nolock; } - if (unlikely(mem_cgroup_try_charge(new_page, mm, gfp, &memcg, true))) { + /* Do not oom kill for khugepaged charges */ + if (unlikely(mem_cgroup_try_charge(new_page, mm, gfp | __GFP_NORETRY, + &memcg, true))) { result = SCAN_CGROUP_CHARGE_FAIL; goto out_nolock; } @@ -1323,7 +1325,9 @@ static void collapse_shmem(struct mm_struct *mm, goto out; } - if (unlikely(mem_cgroup_try_charge(new_page, mm, gfp, &memcg, true))) { + /* Do not oom kill for khugepaged charges */ + if (unlikely(mem_cgroup_try_charge(new_page, mm, gfp | __GFP_NORETRY, + &memcg, true))) { result = SCAN_CGROUP_CHARGE_FAIL; goto out; } @@ -1678,10 +1682,14 @@ 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++; |