diff options
Diffstat (limited to 'drivers/nvdimm/region.c')
| -rw-r--r-- | drivers/nvdimm/region.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c index 2a5f3f53d79d..eb8aebcd4800 100644 --- a/drivers/nvdimm/region.c +++ b/drivers/nvdimm/region.c @@ -10,6 +10,7 @@ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ +#include <linux/cpumask.h> #include <linux/module.h> #include <linux/device.h> #include <linux/nd.h> @@ -18,10 +19,21 @@ static int nd_region_probe(struct device *dev) { int err; + static unsigned long once; struct nd_region_namespaces *num_ns; struct nd_region *nd_region = to_nd_region(dev); int rc = nd_region_register_namespaces(nd_region, &err); + if (nd_region->num_lanes > num_online_cpus() + && nd_region->num_lanes < num_possible_cpus() + && !test_and_set_bit(0, &once)) { + dev_info(dev, "online cpus (%d) < concurrent i/o lanes (%d) < possible cpus (%d)\n", + num_online_cpus(), nd_region->num_lanes, + num_possible_cpus()); + dev_info(dev, "setting nr_cpus=%d may yield better libnvdimm device performance\n", + nd_region->num_lanes); + } + num_ns = devm_kzalloc(dev, sizeof(*num_ns), GFP_KERNEL); if (!num_ns) return -ENOMEM; |