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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-01-29 04:33:37 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-01-29 04:33:37 +0400 |
| commit | dfd0436ad0ce139467b124c646fa65ee2635e14a (patch) | |
| tree | abf9d83c704417cdd484243c12aeffee6b185aba /mm/migrate.c | |
| parent | b9818c3312da66f4b83a4a2e8650628be1237cb5 (diff) | |
| parent | 689dfa894c57842a05bf6dc9f97e6bb71ec5f386 (diff) | |
| download | linux-dfd0436ad0ce139467b124c646fa65ee2635e14a.tar.xz | |
Merge branch 'merge' into next
Merge "merge" branch to bring in various bug fixes that are
going into 3.8
Diffstat (limited to 'mm/migrate.c')
| -rw-r--r-- | mm/migrate.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 3b676b0c5c3e..c38778610aa8 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1679,9 +1679,21 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm, page_xchg_last_nid(new_page, page_last_nid(page)); isolated = numamigrate_isolate_page(pgdat, page); - if (!isolated) { + + /* + * Failing to isolate or a GUP pin prevents migration. The expected + * page count is 2. 1 for anonymous pages without a mapping and 1 + * for the callers pin. If the page was isolated, the page will + * need to be put back on the LRU. + */ + if (!isolated || page_count(page) != 2) { count_vm_events(PGMIGRATE_FAIL, HPAGE_PMD_NR); put_page(new_page); + if (isolated) { + putback_lru_page(page); + isolated = 0; + goto out; + } goto out_keep_locked; } |