[driver-core,v5,9/9] libnvdimm: Schedule device registration on node local to the device
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Message ID 154145234526.29224.2575533246153120029.stgit@ahduyck-desk1.jf.intel.com
State Superseded
Headers show
Series
  • Add NUMA aware async_schedule calls
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Commit Message

Alexander Duyck Nov. 5, 2018, 9:12 p.m. UTC
This patch is meant to force the device registration for nvdimm devices to
be closer to the actual device. This is achieved by using either the NUMA
node ID of the region, or of the parent. By doing this we can have
everything above the region based on the region, and everything below the
region based on the nvdimm bus.

By guaranteeing NUMA locality I see an improvement of as high as 25% for
per-node init of a system with 12TB of persistent memory.

Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
---
 drivers/nvdimm/bus.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

Comments

Bart Van Assche Nov. 7, 2018, 12:26 a.m. UTC | #1
On Mon, 2018-11-05 at 13:12 -0800, Alexander Duyck wrote:
> This patch is meant to force the device registration for nvdimm devices to
> be closer to the actual device. This is achieved by using either the NUMA
> node ID of the region, or of the parent. By doing this we can have
> everything above the region based on the region, and everything below the
> region based on the nvdimm bus.
> 
> By guaranteeing NUMA locality I see an improvement of as high as 25% for
> per-node init of a system with 12TB of persistent memory.

Thank you for having included the performance numbers.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

Patch
diff mbox series

diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index f1fb39921236..b1e193541874 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -23,6 +23,7 @@ 
 #include <linux/ndctl.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
+#include <linux/cpu.h>
 #include <linux/fs.h>
 #include <linux/io.h>
 #include <linux/mm.h>
@@ -513,11 +514,15 @@  void __nd_device_register(struct device *dev)
 		set_dev_node(dev, to_nd_region(dev)->numa_node);
 
 	dev->bus = &nvdimm_bus_type;
-	if (dev->parent)
+	if (dev->parent) {
 		get_device(dev->parent);
+		if (dev_to_node(dev) == NUMA_NO_NODE)
+			set_dev_node(dev, dev_to_node(dev->parent));
+	}
 	get_device(dev);
-	async_schedule_domain(nd_async_device_register, dev,
-			&nd_async_domain);
+
+	async_schedule_dev_domain(nd_async_device_register, dev,
+				  &nd_async_domain);
 }
 
 void nd_device_register(struct device *dev)