[PATCH 1/3] scsi: use NUMA-local allocation for sdev and starget

[Sumit Saxena <sumit.saxena@broadcom.com>]

From: James Rizzo <james.rizzo@broadcom.com>

Allocate scsi_device and scsi_target on the same NUMA node as the host
adapter's DMA device to improve memory locality and reduce cross-node
traffic.

Signed-off-by: James Rizzo <james.rizzo@broadcom.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
---
 drivers/scsi/scsi_scan.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index efcaf85ff699..b98c5b7d8018 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -34,6 +34,7 @@
 #include <linux/kthread.h>
 #include <linux/spinlock.h>
 #include <linux/async.h>
+#include <linux/topology.h>
 #include <linux/slab.h>
 #include <linux/unaligned.h>
 
@@ -286,9 +287,10 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
 	int display_failure_msg = 1, ret;
 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 	struct queue_limits lim;
+	int node = dev_to_node(shost->dma_dev);
 
-	sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
-		       GFP_KERNEL);
+	sdev = kzalloc_node(sizeof(*sdev) + shost->transportt->device_size,
+		       GFP_KERNEL, node);
 	if (!sdev)
 		goto out;
 
@@ -504,8 +506,9 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
 	struct scsi_target *starget;
 	struct scsi_target *found_target;
 	int error, ref_got;
+	int node = dev_to_node(shost->dma_dev);
 
-	starget = kzalloc(size, GFP_KERNEL);
+	starget = kzalloc_node(size, GFP_KERNEL, node);
 	if (!starget) {
 		printk(KERN_ERR "%s: allocation failure\n", __func__);
 		return NULL;
-- 
2.43.7