diff options
| author | Hannes Reinecke <hare@suse.de> | 2019-02-18 11:43:26 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-02-20 07:17:49 -0700 |
| commit | 75c10e73272484bc3a940a9c8e4ec39a7a1b8c21 (patch) | |
| tree | c0c20ba4d5600d531bf0ed2c362888fa963097a6 /drivers/nvme/host/core.c | |
| parent | 49b1f22b567ba1d7d8174950be4398a69d0effb7 (diff) | |
nvme-multipath: round-robin I/O policy
Implement a simple round-robin I/O policy for multipathing. Path
selection is done in two rounds, first iterating across all optimized
paths, and if that doesn't return any valid paths, iterate over all
optimized and non-optimized paths. If no paths are found, use the
existing algorithm. Also add a sysfs attribute 'iopolicy' to switch
between the current NUMA-aware I/O policy and the 'round-robin' I/O
policy.
Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme/host/core.c')
| -rw-r--r-- | drivers/nvme/host/core.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 34758cca7836..cba58d995b30 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -2328,6 +2328,9 @@ static struct attribute *nvme_subsys_attrs[] = { &subsys_attr_serial.attr, &subsys_attr_firmware_rev.attr, &subsys_attr_subsysnqn.attr, +#ifdef CONFIG_NVME_MULTIPATH + &subsys_attr_iopolicy.attr, +#endif NULL, }; @@ -2380,6 +2383,9 @@ static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) memcpy(subsys->firmware_rev, id->fr, sizeof(subsys->firmware_rev)); subsys->vendor_id = le16_to_cpu(id->vid); subsys->cmic = id->cmic; +#ifdef CONFIG_NVME_MULTIPATH + subsys->iopolicy = NVME_IOPOLICY_NUMA; +#endif subsys->dev.class = nvme_subsys_class; subsys->dev.release = nvme_release_subsystem; |