From: 黄涛 <huangtao@rock-chips.com>
Date: Mon, 19 Sep 2011 04:04:27 +0000 (+0800)
Subject: mm: add _GFP_NO_KSWAPD flag
X-Git-Tag: firefly_0821_release~9767^2~25^2~4
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6befb4f40fdcb1c64296cfbcda8d3526b847b2a9;p=firefly-linux-kernel-4.4.55.git

mm: add _GFP_NO_KSWAPD flag

commit 32dba98e085f8b2b4345887df9abf5e0e93bfc12 upstream.
---

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 557bdad320b6..64d72e58f8e0 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -59,13 +59,15 @@ struct vm_area_struct;
 #define __GFP_NOTRACK	((__force gfp_t)0)
 #endif
 
+#define __GFP_NO_KSWAPD	((__force gfp_t)0x400000u)
+
 /*
  * This may seem redundant, but it's a way of annotating false positives vs.
  * allocations that simply cannot be supported (e.g. page tables).
  */
 #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)
 
-#define __GFP_BITS_SHIFT 22	/* Room for 22 __GFP_FOO bits */
+#define __GFP_BITS_SHIFT 23	/* Room for 23 __GFP_FOO bits */
 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
 
 /* This equals 0, but use constants in case they ever change */
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e1881454831f..033218c33378 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1833,7 +1833,8 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
 		goto nopage;
 
 restart:
-	wake_all_kswapd(order, zonelist, high_zoneidx);
+	if (!(gfp_mask & __GFP_NO_KSWAPD))
+		wake_all_kswapd(order, zonelist, high_zoneidx);
 
 	/*
 	 * OK, we're below the kswapd watermark and have kicked background