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libnvdimm: Debug probe times

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Instrument nvdimm_bus_probe() to emit timestamps for the start and end
of libnvdimm device probing. This is useful for identifying sources of
libnvdimm sub-system initialization latency.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2018-06-01 14:10:58 -07:00
parent 254a4cd50b
commit 3f46833df9
1 changed files with 4 additions and 1 deletions
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5
drivers/nvdimm/bus.c
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@ -100,6 +100,9 @@ static int nvdimm_bus_probe(struct device *dev)
if (!try_module_get(provider))
return -ENXIO;
dev_dbg(&nvdimm_bus->dev, "START: %s.probe(%s)\n",
dev->driver->name, dev_name(dev));
nvdimm_bus_probe_start(nvdimm_bus);
rc = nd_drv->probe(dev);
if (rc == 0)
@ -108,7 +111,7 @@ static int nvdimm_bus_probe(struct device *dev)
nd_region_disable(nvdimm_bus, dev);
nvdimm_bus_probe_end(nvdimm_bus);
dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name,
dev_dbg(&nvdimm_bus->dev, "END: %s.probe(%s) = %d\n", dev->driver->name,
dev_name(dev), rc);
if (rc != 0)