Commit c37e20ea authored Jan 22, 2019 by Alexander Duyck Committed by Greg Kroah-Hartman Jan 31, 2019

driver core: Attach devices on CPU local to device node

Call the asynchronous probe routines on a CPU local to the device node. By
doing this we should be able to improve our initialization time
significantly as we can avoid having to access the device from a remote
node which may introduce higher latency.

For example, in the case of initializing memory for NVDIMM this can have a
significant impact as initialing 3TB on remote node can take up to 39
seconds while initialing it on a local node only takes 23 seconds. It is
situations like this where we will see the biggest improvement.

Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 6be9238e

drivers/base/dd.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -829,7 +829,7 @@ static int __device_attach(struct device *dev, bool allow_async)
		*/
		dev_dbg(dev, "scheduling asynchronous probe\n");
		get_device(dev);
		async_schedule(__device_attach_async_helper, dev);
		async_schedule_dev(__device_attach_async_helper, dev);
		} else {
		pm_request_idle(dev);
		}
		@@ -989,7 +989,7 @@ static int __driver_attach(struct device dev, void data)
		if (!dev->driver) {
		get_device(dev);
		dev->p->async_driver = drv;
		async_schedule(__driver_attach_async_helper, dev);
		async_schedule_dev(__driver_attach_async_helper, dev);
		}
		device_unlock(dev);
		return 0;

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