From: Mel Gorman <mgorman@suse.de>
Date: Fri, 2 Dec 2011 03:11:40 +0000 (+1100)
Subject: mm-do-not-stall-in-synchronous-compaction-for-thp-allocations-v3
X-Git-Tag: next-20111205~1^2~157
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=517277adeb036d90905e42d26ac6e66b953fe491;p=karo-tx-linux.git

mm-do-not-stall-in-synchronous-compaction-for-thp-allocations-v3

Cc: Andy Isaacson <adi@hexapodia.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 1f862447ea79..82d30fafed6b 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -89,6 +89,9 @@ struct vm_area_struct;
  * 1. Do not wake kswapd (hence the flag name)
  * 2. Do not use stall in synchronous compaction for high-order allocations
  *    as this may cause the caller to stall writing out pages
+ *
+ * This flag it primarily intended for use with transparent hugepage support.
+ * If the flag is used outside the VM, linux-mm should be cc'd for review.
  */
 #define __GFP_NO_KSWAPD	((__force gfp_t)___GFP_NO_KSWAPD)