linux-kernel - [RFC] mm: show message when updating min_free

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Date:	Wed, 1 Jan 2014 08:29:35 +0800
From:	Han Pingtian <hanpt@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Subject: [RFC] mm: show message when updating min_free_kbytes in thp

min_free_kbytes may be updated during thp's initialization. Sometimes,
this will change the value being set by user. Showing message will
clarify this confusion.

Signed-off-by: Han Pingtian <hanpt@...ux.vnet.ibm.com>
---
 mm/huge_memory.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 7de1bf8..46011c6 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -130,8 +130,11 @@ static int set_recommended_min_free_kbytes(void)
 			      (unsigned long) nr_free_buffer_pages() / 20);
 	recommended_min <<= (PAGE_SHIFT-10);
 
-	if (recommended_min > min_free_kbytes)
+	if (recommended_min > min_free_kbytes) {
 		min_free_kbytes = recommended_min;
+		pr_info("min_free_kbytes is updated to %d by enabling transparent hugepage.\n",
+			min_free_kbytes);
+	}
 	setup_per_zone_wmarks();
 	return 0;
 }
-- 
1.7.7.6

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