diff mbox series

[v6,2/7] vhost: fix missing guest pages table NUMA realloc

Message ID 20210618140357.255995-3-maxime.coquelin@redhat.com (mailing list archive)
State Superseded
Delegated to: Maxime Coquelin
Headers show
Series vhost: Fix and improve NUMA reallocation | expand

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Maxime Coquelin June 18, 2021, 2:03 p.m. UTC
When the guest allocates virtqueues on a different NUMA node
than the one the Vhost metadata are allocated, both the Vhost
device struct and the virtqueues struct are reallocated.

However, reallocating the guest pages table was missing, which
likely causes at least one cross-NUMA accesses for every burst
of packets.

This patch reallocates this table on the same NUMA node as the
other metadata.

Fixes: e246896178e6 ("vhost: get guest/host physical address mappings")
Cc: stable@dpdk.org

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 lib/vhost/vhost_user.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

Comments

Chenbo Xia June 25, 2021, 2:26 a.m. UTC | #1
> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin@redhat.com>
> Sent: Friday, June 18, 2021 10:04 PM
> To: dev@dpdk.org; david.marchand@redhat.com; Xia, Chenbo <chenbo.xia@intel.com>
> Cc: Maxime Coquelin <maxime.coquelin@redhat.com>; stable@dpdk.org
> Subject: [PATCH v6 2/7] vhost: fix missing guest pages table NUMA realloc
> 
> When the guest allocates virtqueues on a different NUMA node
> than the one the Vhost metadata are allocated, both the Vhost
> device struct and the virtqueues struct are reallocated.
> 
> However, reallocating the guest pages table was missing, which
> likely causes at least one cross-NUMA accesses for every burst
> of packets.
> 
> This patch reallocates this table on the same NUMA node as the
> other metadata.
> 
> Fixes: e246896178e6 ("vhost: get guest/host physical address mappings")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>  lib/vhost/vhost_user.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
> index b5a84f3dcd..5fb055ea2e 100644
> --- a/lib/vhost/vhost_user.c
> +++ b/lib/vhost/vhost_user.c
> @@ -558,7 +558,8 @@ numa_realloc(struct virtio_net *dev, int index)
>  	}
>  	if (oldnode != newnode) {
>  		struct rte_vhost_memory *old_mem;
> -		ssize_t mem_size;
> +		struct guest_page *old_gp;
> +		ssize_t mem_size, gp_size;
> 
>  		VHOST_LOG_CONFIG(INFO,
>  			"reallocate dev from %d to %d node\n",
> @@ -583,6 +584,17 @@ numa_realloc(struct virtio_net *dev, int index)
> 
>  		memcpy(dev->mem, old_mem, mem_size);
>  		rte_free(old_mem);
> +
> +		gp_size = dev->max_guest_pages * sizeof(*dev->guest_pages);
> +		old_gp = dev->guest_pages;
> +		dev->guest_pages = rte_malloc_socket(NULL, gp_size,
> RTE_CACHE_LINE_SIZE, newnode);
> +		if (!dev->guest_pages) {
> +			dev->guest_pages = old_gp;
> +			goto out;
> +		}
> +
> +		memcpy(dev->guest_pages, old_gp, gp_size);
> +		rte_free(old_gp);
>  	}
> 
>  out:
> --
> 2.31.1


Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
diff mbox series

Patch

diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
index b5a84f3dcd..5fb055ea2e 100644
--- a/lib/vhost/vhost_user.c
+++ b/lib/vhost/vhost_user.c
@@ -558,7 +558,8 @@  numa_realloc(struct virtio_net *dev, int index)
 	}
 	if (oldnode != newnode) {
 		struct rte_vhost_memory *old_mem;
-		ssize_t mem_size;
+		struct guest_page *old_gp;
+		ssize_t mem_size, gp_size;
 
 		VHOST_LOG_CONFIG(INFO,
 			"reallocate dev from %d to %d node\n",
@@ -583,6 +584,17 @@  numa_realloc(struct virtio_net *dev, int index)
 
 		memcpy(dev->mem, old_mem, mem_size);
 		rte_free(old_mem);
+
+		gp_size = dev->max_guest_pages * sizeof(*dev->guest_pages);
+		old_gp = dev->guest_pages;
+		dev->guest_pages = rte_malloc_socket(NULL, gp_size, RTE_CACHE_LINE_SIZE, newnode);
+		if (!dev->guest_pages) {
+			dev->guest_pages = old_gp;
+			goto out;
+		}
+
+		memcpy(dev->guest_pages, old_gp, gp_size);
+		rte_free(old_gp);
 	}
 
 out: