linux-kernel - [PATCH 2/2] fs/aio.c: use get_user_pages_non_movable() to pin ring pages when support memory hotremove

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Date:	Mon, 4 Feb 2013 18:04:08 +0800
From:	Lin Feng <linfeng@...fujitsu.com>
To:	akpm@...ux-foundation.org, mgorman@...e.de, bcrl@...ck.org,
	viro@...iv.linux.org.uk
Cc:	khlebnikov@...nvz.org, walken@...gle.com,
	kamezawa.hiroyu@...fujitsu.com, minchan@...nel.org,
	riel@...hat.com, rientjes@...gle.com,
	isimatu.yasuaki@...fujitsu.com, wency@...fujitsu.com,
	laijs@...fujitsu.com, jiang.liu@...wei.com, linux-mm@...ck.org,
	linux-aio@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Lin Feng <linfeng@...fujitsu.com>
Subject: [PATCH 2/2] fs/aio.c: use get_user_pages_non_movable() to pin ring pages when support memory hotremove

This patch gets around the aio ring pages can't be migrated bug caused by
get_user_pages() via using the new function. It only works as configed with
CONFIG_MEMORY_HOTREMOVE, otherwise it uses the old version of get_user_pages().

Cc: Benjamin LaHaise <bcrl@...ck.org>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Reviewed-by: Tang Chen <tangchen@...fujitsu.com>
Reviewed-by: Gu Zheng <guz.fnst@...fujitsu.com>
Signed-off-by: Lin Feng <linfeng@...fujitsu.com>
---
 fs/aio.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/aio.c b/fs/aio.c
index 71f613c..0e9b30a 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -138,9 +138,15 @@ static int aio_setup_ring(struct kioctx *ctx)
 	}
 
 	dprintk("mmap address: 0x%08lx\n", info->mmap_base);
+#ifdef CONFIG_MEMORY_HOTREMOVE
+	info->nr_pages = get_user_pages_non_movable(current, ctx->mm,
+					info->mmap_base, nr_pages,
+					1, 0, info->ring_pages, NULL);
+#else
 	info->nr_pages = get_user_pages(current, ctx->mm,
 					info->mmap_base, nr_pages, 
 					1, 0, info->ring_pages, NULL);
+#endif
 	up_write(&ctx->mm->mmap_sem);
 
 	if (unlikely(info->nr_pages != nr_pages)) {
-- 
1.7.11.7

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