aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorZach Brown <zach.brown@oracle.com>2010-07-06 15:09:56 -0700
committerAndy Grover <andy.grover@oracle.com>2010-09-08 18:16:34 -0700
commit515e079dab19cf774d1eec6e5f4ed65509e31ef1 (patch)
tree1dcc0f211946c47cd19b6823574aaa1a32982ffa
parentRDS/IB: destroy connections on rmmod (diff)
downloadlinux-dev-515e079dab19cf774d1eec6e5f4ed65509e31ef1.tar.xz
linux-dev-515e079dab19cf774d1eec6e5f4ed65509e31ef1.zip
RDS/IB: create a work queue for FMR flushing
This patch moves the FMR flushing work in to its own mult-threaded work queue. This is to maintain performance in preparation for returning the main krdsd work queue back to a single threaded work queue to avoid deep-rooted concurrency bugs. This is also good because it further separates FMRs, which might be removed some day, from the rest of the code base. Signed-off-by: Zach Brown <zach.brown@oracle.com>
-rw-r--r--net/rds/ib.c9
-rw-r--r--net/rds/ib.h2
-rw-r--r--net/rds/ib_rdma.c25
3 files changed, 33 insertions, 3 deletions
diff --git a/net/rds/ib.c b/net/rds/ib.c
index af1ef18b6ff0..d2007b931616 100644
--- a/net/rds/ib.c
+++ b/net/rds/ib.c
@@ -351,6 +351,7 @@ void rds_ib_exit(void)
rds_ib_sysctl_exit();
rds_ib_recv_exit();
rds_trans_unregister(&rds_ib_transport);
+ rds_ib_fmr_exit();
}
struct rds_transport rds_ib_transport = {
@@ -386,10 +387,14 @@ int __init rds_ib_init(void)
INIT_LIST_HEAD(&rds_ib_devices);
- ret = ib_register_client(&rds_ib_client);
+ ret = rds_ib_fmr_init();
if (ret)
goto out;
+ ret = ib_register_client(&rds_ib_client);
+ if (ret)
+ goto out_fmr_exit;
+
ret = rds_ib_sysctl_init();
if (ret)
goto out_ibreg;
@@ -412,6 +417,8 @@ out_sysctl:
rds_ib_sysctl_exit();
out_ibreg:
rds_ib_unregister_client();
+out_fmr_exit:
+ rds_ib_fmr_exit();
out:
return ret;
}
diff --git a/net/rds/ib.h b/net/rds/ib.h
index e9f9ddf440ca..fd4ea69d2443 100644
--- a/net/rds/ib.h
+++ b/net/rds/ib.h
@@ -308,6 +308,8 @@ void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
void rds_ib_sync_mr(void *trans_private, int dir);
void rds_ib_free_mr(void *trans_private, int invalidate);
void rds_ib_flush_mrs(void);
+int __init rds_ib_fmr_init(void);
+void __exit rds_ib_fmr_exit(void);
/* ib_recv.c */
int __init rds_ib_recv_init(void);
diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c
index 00f3995351c8..0eb597670c5b 100644
--- a/net/rds/ib_rdma.c
+++ b/net/rds/ib_rdma.c
@@ -691,6 +691,26 @@ out_nolock:
return ret;
}
+struct workqueue_struct *rds_ib_fmr_wq;
+
+int __init rds_ib_fmr_init(void)
+{
+ rds_ib_fmr_wq = create_workqueue("rds_fmr_flushd");
+ if (!rds_ib_fmr_wq)
+ return -ENOMEM;
+ return 0;
+}
+
+/*
+ * By the time this is called all the IB devices should have been torn down and
+ * had their pools freed. As each pool is freed its work struct is waited on,
+ * so the pool flushing work queue should be idle by the time we get here.
+ */
+void __exit rds_ib_fmr_exit(void)
+{
+ destroy_workqueue(rds_ib_fmr_wq);
+}
+
static void rds_ib_mr_pool_flush_worker(struct work_struct *work)
{
struct rds_ib_mr_pool *pool = container_of(work, struct rds_ib_mr_pool, flush_worker.work);
@@ -718,7 +738,7 @@ void rds_ib_free_mr(void *trans_private, int invalidate)
/* If we've pinned too many pages, request a flush */
if (atomic_read(&pool->free_pinned) >= pool->max_free_pinned ||
atomic_read(&pool->dirty_count) >= pool->max_items / 10)
- queue_delayed_work(rds_wq, &pool->flush_worker, 10);
+ queue_delayed_work(rds_ib_fmr_wq, &pool->flush_worker, 10);
if (invalidate) {
if (likely(!in_interrupt())) {
@@ -726,7 +746,8 @@ void rds_ib_free_mr(void *trans_private, int invalidate)
} else {
/* We get here if the user created a MR marked
* as use_once and invalidate at the same time. */
- queue_delayed_work(rds_wq, &pool->flush_worker, 10);
+ queue_delayed_work(rds_ib_fmr_wq,
+ &pool->flush_worker, 10);
}
}