linux-kernel - [PATCH] mm, swap_state.c: declare a few variables as __read

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Message-Id: <1507802349-5554-1-git-send-email-changbin.du@intel.com>
Date:   Thu, 12 Oct 2017 17:59:09 +0800
From:   changbin.du@...el.com
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Changbin Du <changbin.du@...el.com>
Subject: [PATCH] mm, swap_state.c: declare a few variables as __read_mostly

From: Changbin Du <changbin.du@...el.com>

These global variables are only set during initialization or rarely
change, so declare them as __read_mostly.

Signed-off-by: Changbin Du <changbin.du@...el.com>
---
 mm/swap_state.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/swap_state.c b/mm/swap_state.c
index ed91091..71e667d 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -35,13 +35,13 @@ static const struct address_space_operations swap_aops = {
 #endif
 };
 
-struct address_space *swapper_spaces[MAX_SWAPFILES];
-static unsigned int nr_swapper_spaces[MAX_SWAPFILES];
-bool swap_vma_readahead = true;
+struct address_space *swapper_spaces[MAX_SWAPFILES] __read_mostly;
+static unsigned int nr_swapper_spaces[MAX_SWAPFILES] __read_mostly;
+bool swap_vma_readahead __read_mostly = true;
 
 #define SWAP_RA_MAX_ORDER_DEFAULT	3
 
-static int swap_ra_max_order = SWAP_RA_MAX_ORDER_DEFAULT;
+static int swap_ra_max_order __read_mostly = SWAP_RA_MAX_ORDER_DEFAULT;
 
 #define SWAP_RA_WIN_SHIFT	(PAGE_SHIFT / 2)
 #define SWAP_RA_HITS_MASK	((1UL << SWAP_RA_WIN_SHIFT) - 1)
-- 
2.7.4