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Date: Fri, 2 Mar 2012 14:10:35 +0800 From: Fengguang Wu <fengguang.wu@...el.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Johannes Weiner <hannes@...xchg.org>, Jan Kara <jack@...e.cz>, Greg Thelen <gthelen@...gle.com>, Ying Han <yinghan@...gle.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan.kim@...il.com>, Linux Memory Management List <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org> Subject: [PATCH] mm: don't set __GFP_WRITE on ramfs/sysfs writes 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@...xchg.org> Signed-off-by: Fengguang Wu <fengguang.wu@...el.com> --- 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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