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readahead: readahead page allocations are OK to fail

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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>
This commit is contained in:
Wu Fengguang 2011-05-24 17:12:25 -07:00 committed by Linus Torvalds
parent 6d3163ce86
commit 7b1de5868b
2 changed files with 7 additions and 1 deletions
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6
include/linux/pagemap.h
View File

@ -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,

2
mm/readahead.c
View File

@ -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;