linux-kernel - [RFC 1/3] mm: Introduce new page flag

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Date:	Tue, 13 Aug 2013 16:05:00 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-mm@...ck.org, k.kozlowski@...sung.com,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Mel Gorman <mgorman@...e.de>, guz.fnst@...fujitsu.com,
	Benjamin LaHaise <bcrl@...ck.org>,
	Dave Hansen <dave.hansen@...el.com>, lliubbo@...il.com,
	aquini@...hat.com, Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan@...nel.org>
Subject: [RFC 1/3] mm: Introduce new page flag

Signed-off-by: Minchan Kim <minchan@...nel.org>
---
 include/linux/page-flags.h |    2 ++
 mm/page_alloc.c            |    1 +
 2 files changed, 3 insertions(+)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 6d53675..75ce843 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -109,6 +109,7 @@ enum pageflags {
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 	PG_compound_lock,
 #endif
+	PG_pin,
 	__NR_PAGEFLAGS,
 
 	/* Filesystems */
@@ -197,6 +198,7 @@ struct page;	/* forward declaration */
 
 TESTPAGEFLAG(Locked, locked)
 PAGEFLAG(Error, error) TESTCLEARFLAG(Error, error)
+PAGEFLAG(Pin, pin) TESTCLEARFLAG(Pin, pin)
 PAGEFLAG(Referenced, referenced) TESTCLEARFLAG(Referenced, referenced)
 PAGEFLAG(Dirty, dirty) TESTSCFLAG(Dirty, dirty) __CLEARPAGEFLAG(Dirty, dirty)
 PAGEFLAG(LRU, lru) __CLEARPAGEFLAG(LRU, lru)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b100255..5dd8b43 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6345,6 +6345,7 @@ static const struct trace_print_flags pageflag_names[] = {
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 	{1UL << PG_compound_lock,	"compound_lock"	},
 #endif
+	{1UL << PG_pin,			"pin"		},
 };
 
 static void dump_page_flags(unsigned long flags)
-- 
1.7.9.5

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