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authorFengguang Wu <fengguang.wu@intel.com>2012-03-21 16:34:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-21 17:54:58 -0700
commit1010bb1b80edb0713415dfe1f97114d320f58c4f (patch)
tree70aeaba13b61aa442e0c48c99a1035e204910982 /mm/filemap.c
parenta05b0855fd15504972dba2358e5faa172a1e50ba (diff)
downloadblackbird-op-linux-1010bb1b80edb0713415dfe1f97114d320f58c4f.tar.gz
blackbird-op-linux-1010bb1b80edb0713415dfe1f97114d320f58c4f.zip
mm: don't set __GFP_WRITE on ramfs/sysfs writes
There is not much point in skipping zones during allocation based on the dirty usage which they'll never contribute to. And we'd like to avoid page reclaim waits when writing to ramfs/sysfs etc. Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Jan Kara <jack@suse.cz> Cc: Greg Thelen <gthelen@google.com> Cc: Ying Han <yinghan@google.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Acked-by: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 2f8165075a5a..e8cf8aefd6f6 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2341,7 +2341,9 @@ struct page *grab_cache_page_write_begin(struct address_space *mapping,
struct page *page;
gfp_t gfp_notmask = 0;
- gfp_mask = mapping_gfp_mask(mapping) | __GFP_WRITE;
+ gfp_mask = mapping_gfp_mask(mapping);
+ if (mapping_cap_account_dirty(mapping))
+ gfp_mask |= __GFP_WRITE;
if (flags & AOP_FLAG_NOFS)
gfp_notmask = __GFP_FS;
repeat:
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