linux-kernel - [PATCH 2/4] zswap: use GFP_NOIO instead of GFP

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Message-ID: <CAL1ERfNdZX_j2Qg-fb9g1U4Wjv8qZwKgUX=JGGjOa6q0zOWEEA@mail.gmail.com>
Date:	Fri, 23 Aug 2013 19:06:20 +0800
From:	Weijie Yang <weijie.yang.kh@...il.com>
To:	Minchan Kim <minchan@...nel.org>, Bob Liu <bob.liu@...cle.com>,
	sjenning@...ux.vnet.ibm.com
Cc:	weijie.yang@...sung.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] zswap: use GFP_NOIO instead of GFP_KERNEL

avoid zswap store and reclaim functions called recursively.

---
 mm/zswap.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index 1cf1c07..5f97f4f 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -427,7 +427,7 @@ static int zswap_get_swap_cache_page(swp_entry_t entry,
 		 * Get a new page to read into from swap.
 		 */
 		if (!new_page) {
-			new_page = alloc_page(GFP_KERNEL);
+			new_page = alloc_page(GFP_NOIO);
 			if (!new_page)
 				break; /* Out of memory */
 		}
@@ -435,7 +435,7 @@ static int zswap_get_swap_cache_page(swp_entry_t entry,
 		/*
 		 * call radix_tree_preload() while we can wait.
 		 */
-		err = radix_tree_preload(GFP_KERNEL);
+		err = radix_tree_preload(GFP_NOIO);
 		if (err)
 			break;

@@ -628,7 +628,7 @@ static int zswap_frontswap_store(unsigned type,
pgoff_t offset,
 	}

 	/* allocate entry */
-	entry = zswap_entry_cache_alloc(GFP_KERNEL);
+	entry = zswap_entry_cache_alloc(GFP_NOIO);
 	if (!entry) {
 		zswap_reject_kmemcache_fail++;
 		ret = -ENOMEM;
-- 
1.7.0.4
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