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RDS/IB: create a work queue for FMR flushing

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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>
This commit is contained in:
Zach Brown 2010-07-06 15:09:56 -07:00 committed by Andy Grover
parent 8aeb1ba663
commit 515e079dab
3 changed files with 33 additions and 3 deletions
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9
net/rds/ib.c
View file

@ -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 @@ int __init rds_ib_init(void)
rds_ib_sysctl_exit();
out_ibreg:
rds_ib_unregister_client();
out_fmr_exit:
rds_ib_fmr_exit();
out:
return ret;
}

2
net/rds/ib.h
View file

@ -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);

25
net/rds/ib_rdma.c
View file

@ -691,6 +691,26 @@ static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool,
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);
}
}