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Subject[PATCH 20/32] aio: Give shared kioctx fields their own cachelines
Date
Signed-off-by: Kent Overstreet <koverstreet@google.com>
---
fs/aio.c | 27 +++++++++++++++------------
1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/fs/aio.c b/fs/aio.c
index 96fbd6b..fa87732 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -67,13 +67,6 @@ struct kioctx {
unsigned long user_id;
struct hlist_node list;

- wait_queue_head_t wait;
-
- spinlock_t ctx_lock;
-
- atomic_t reqs_active;
- struct list_head active_reqs; /* used for cancellation */
-
unsigned nr;

/* sys_io_setup currently limits this to an unsigned int */
@@ -85,19 +78,29 @@ struct kioctx {
struct page **ring_pages;
long nr_pages;

+ struct rcu_head rcu_head;
+ struct work_struct rcu_work;
+
struct {
- struct mutex ring_lock;
+ atomic_t reqs_active;
} ____cacheline_aligned;

struct {
+ spinlock_t ctx_lock;
+ struct list_head active_reqs; /* used for cancellation */
+ } ____cacheline_aligned_in_smp;
+
+ struct {
+ struct mutex ring_lock;
+ wait_queue_head_t wait;
+ } ____cacheline_aligned_in_smp;
+
+ struct {
unsigned tail;
spinlock_t completion_lock;
- } ____cacheline_aligned;
+ } ____cacheline_aligned_in_smp;

struct page *internal_pages[AIO_RING_PAGES];
-
- struct rcu_head rcu_head;
- struct work_struct rcu_work;
};

/*------ sysctl variables----*/
--
1.7.12


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