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| author | Wu Fengguang <fengguang.wu@intel.com> | 2011-05-25 02:12:25 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 17:39:25 +0200 |
| commit | 7b1de5868b124d8f399d8791ed30a9b679d64d4d (patch) | |
| tree | 3a7d5d7a6ccc3226648cb0e56387614b7066c3ff | |
| parent | mm: check if any page in a pageblock is reserved before marking it MIGRATE_RE... (diff) | |
| download | linux-7b1de5868b124d8f399d8791ed30a9b679d64d4d.tar.xz linux-7b1de5868b124d8f399d8791ed30a9b679d64d4d.zip | |
readahead: readahead page allocations are OK to fail
Pass __GFP_NORETRY|__GFP_NOWARN for readahead page allocations.
readahead page allocations are completely optional. They are OK to fail
and in particular shall not trigger OOM on themselves.
Reported-by: Dave Young <hidave.darkstar@gmail.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/pagemap.h | 6 | ||||
| -rw-r--r-- | mm/readahead.c | 2 |
2 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index ea268080380d..716875e53520 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -219,6 +219,12 @@ static inline struct page *page_cache_alloc_cold(struct address_space *x) return __page_cache_alloc(mapping_gfp_mask(x)|__GFP_COLD); } +static inline struct page *page_cache_alloc_readahead(struct address_space *x) +{ + return __page_cache_alloc(mapping_gfp_mask(x) | + __GFP_COLD | __GFP_NORETRY | __GFP_NOWARN); +} + typedef int filler_t(void *, struct page *); extern struct page * find_get_page(struct address_space *mapping, diff --git a/mm/readahead.c b/mm/readahead.c index 2c0cc489e288..867f9dd82dcd 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -180,7 +180,7 @@ __do_page_cache_readahead(struct address_space *mapping, struct file *filp, if (page) continue; - page = page_cache_alloc_cold(mapping); + page = page_cache_alloc_readahead(mapping); if (!page) break; page->index = page_offset; |