There is not much of a 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. Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> Signed-off-by: Fengguang Wu <fengguang.wu@xxxxxxxxx> --- mm/filemap.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- linux.orig/mm/filemap.c 2012-03-02 14:06:47.000000000 +0800 +++ linux/mm/filemap.c 2012-03-02 14:07:21.325766507 +0800 @@ -2341,7 +2341,9 @@ struct page *grab_cache_page_write_begin 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: -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>