linux-kernel - [PATCH V2 3/3] Drivers: hv: vmbus: Allocate ring buffer memory in NUMA aware fashion

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Message-Id: <1433054269-22278-3-git-send-email-kys@microsoft.com>
Date:	Sat, 30 May 2015 23:37:49 -0700
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	vkuznets@...hat.com, jasowang@...hat.com
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH V2 3/3] Drivers: hv: vmbus: Allocate ring buffer memory in NUMA aware fashion

Allocate ring buffer memory from the NUMA node assigned to the channel.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 drivers/hv/channel.c |   14 ++++++++++++--
 1 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 7a1c2db..603ce97 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -73,6 +73,7 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
 	unsigned long flags;
 	int ret, err = 0;
 	unsigned long t;
+	struct page *page;
 
 	spin_lock_irqsave(&newchannel->lock, flags);
 	if (newchannel->state == CHANNEL_OPEN_STATE) {
@@ -87,8 +88,17 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
 	newchannel->channel_callback_context = context;
 
 	/* Allocate the ring buffer */
-	out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
-		get_order(send_ringbuffer_size + recv_ringbuffer_size));
+	page = alloc_pages_node(cpu_to_node(newchannel->target_cpu),
+				GFP_KERNEL|__GFP_ZERO,
+				get_order(send_ringbuffer_size +
+				recv_ringbuffer_size));
+
+	if (!page)
+		out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
+					       get_order(send_ringbuffer_size +
+					       recv_ringbuffer_size));
+	else
+		out = (void *)page_address(page);
 
 	if (!out) {
 		err = -ENOMEM;
-- 
1.7.4.1

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