linux-kernel - [POC 09/12] fs/inode.c: access inode_cachep via rai

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Date:   Thu, 18 Oct 2018 00:33:29 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     linux-kernel@...r.kernel.org
Cc:     x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        Ingo Molnar <mingo@...nel.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [POC 09/12] fs/inode.c: access inode_cachep via rai_load

This avoids a cacheline access to get the value of the inode_cachep
pointer in the places that do a kmem_cache_*(inode_cachep, ...);

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 fs/inode.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/inode.c b/fs/inode.c
index 42f6d25f32a5..f1e9f548494e 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -19,6 +19,7 @@
 #include <linux/ratelimit.h>
 #include <linux/list_lru.h>
 #include <linux/iversion.h>
+#include <linux/rai.h>
 #include <trace/events/writeback.h>
 #include "internal.h"
 
@@ -74,7 +75,8 @@ struct inodes_stat_t inodes_stat;
 static DEFINE_PER_CPU(unsigned long, nr_inodes);
 static DEFINE_PER_CPU(unsigned long, nr_unused);
 
-static struct kmem_cache *inode_cachep __read_mostly;
+static struct kmem_cache *__inode_cachep __read_mostly;
+#define inode_cachep rai_load(__inode_cachep)
 
 static long get_nr_inodes(void)
 {
@@ -1951,7 +1953,7 @@ void __init inode_init_early(void)
 void __init inode_init(void)
 {
 	/* inode slab cache */
-	inode_cachep = kmem_cache_create("inode_cache",
+	__inode_cachep = kmem_cache_create("inode_cache",
 					 sizeof(struct inode),
 					 0,
 					 (SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|
-- 
2.19.1.6.gbde171bbf5