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| author |   Christoph Hellwig <hch@lst.de> | 2018-09-11 09:51:29 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-10-01 14:16:14 -0700 |
| commit | f333444708f82c4a4d3ccac004da0bfd9cfdfa42 (patch) | |
| tree | a1aace9b855c7d01119f521179babf11eb941f2d /drivers/nvme/host/nvme.h | |
| parent | nvmet: don't split large I/Os unconditionally (diff) | |
| download | linux-dev-f333444708f82c4a4d3ccac004da0bfd9cfdfa42.tar.xz linux-dev-f333444708f82c4a4d3ccac004da0bfd9cfdfa42.zip | |
nvme: take node locality into account when selecting a path
Make current_path an array with an entry for every possible node, and
cache the best path on a per-node basis. Take the node distance into
account when selecting it. This is primarily useful for dual-ported PCIe
devices which are connected to PCIe root ports on different sockets.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/nvme/host/nvme.h | 25 |
1 files changed, 9 insertions, 16 deletions
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 2503f8fd54da..9fefba039d1e 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -277,14 +277,6 @@ struct nvme_ns_ids { * only ever has a single entry for private namespaces. */ struct nvme_ns_head { -#ifdef CONFIG_NVME_MULTIPATH - struct gendisk *disk; - struct nvme_ns __rcu *current_path; - struct bio_list requeue_list; - spinlock_t requeue_lock; - struct work_struct requeue_work; - struct mutex lock; -#endif struct list_head list; struct srcu_struct srcu; struct nvme_subsystem *subsys; @@ -293,6 +285,14 @@ struct nvme_ns_head { struct list_head entry; struct kref ref; int instance; +#ifdef CONFIG_NVME_MULTIPATH + struct gendisk *disk; + struct bio_list requeue_list; + spinlock_t requeue_lock; + struct work_struct requeue_work; + struct mutex lock; + struct nvme_ns __rcu *current_path[]; +#endif }; #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS @@ -474,14 +474,7 @@ void nvme_mpath_remove_disk(struct nvme_ns_head *head); int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id); void nvme_mpath_uninit(struct nvme_ctrl *ctrl); void nvme_mpath_stop(struct nvme_ctrl *ctrl); - -static inline void nvme_mpath_clear_current_path(struct nvme_ns *ns) -{ - struct nvme_ns_head *head = ns->head; - - if (head && ns == rcu_access_pointer(head->current_path)) - rcu_assign_pointer(head->current_path, NULL); -} +void nvme_mpath_clear_current_path(struct nvme_ns *ns); struct nvme_ns *nvme_find_path(struct nvme_ns_head *head); static inline void nvme_mpath_check_last_path(struct nvme_ns *ns) |