linux-kernel - Re: [PATCH v1 01/29] virtio-mem: determine nid only once using memory_add_physaddr_to

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Date:   Thu, 15 Oct 2020 11:56:39 +0800
From:   Wei Yang <richard.weiyang@...ux.alibaba.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        virtualization@...ts.linux-foundation.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>
Subject: Re: [PATCH v1 01/29] virtio-mem: determine nid only once using
 memory_add_physaddr_to_nid()

On Mon, Oct 12, 2020 at 02:52:55PM +0200, David Hildenbrand wrote:
>Let's determine the target nid only once in case we have none specified -
>usually, we'll end up with node 0 either way.
>
>Cc: "Michael S. Tsirkin" <mst@...hat.com>
>Cc: Jason Wang <jasowang@...hat.com>
>Cc: Pankaj Gupta <pankaj.gupta.linux@...il.com>
>Signed-off-by: David Hildenbrand <david@...hat.com>

Reviewed-by: Wei Yang <richard.weiyang@...ux.alibaba.com>

>---
> drivers/virtio/virtio_mem.c | 28 +++++++++++-----------------
> 1 file changed, 11 insertions(+), 17 deletions(-)
>
>diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
>index ba4de598f663..a1f5bf7a571a 100644
>--- a/drivers/virtio/virtio_mem.c
>+++ b/drivers/virtio/virtio_mem.c
>@@ -70,7 +70,7 @@ struct virtio_mem {
> 
> 	/* The device block size (for communicating with the device). */
> 	uint64_t device_block_size;
>-	/* The translated node id. NUMA_NO_NODE in case not specified. */
>+	/* The determined node id for all memory of the device. */
> 	int nid;
> 	/* Physical start address of the memory region. */
> 	uint64_t addr;
>@@ -406,10 +406,6 @@ static int virtio_mem_sb_bitmap_prepare_next_mb(struct virtio_mem *vm)
> static int virtio_mem_mb_add(struct virtio_mem *vm, unsigned long mb_id)
> {
> 	const uint64_t addr = virtio_mem_mb_id_to_phys(mb_id);
>-	int nid = vm->nid;
>-
>-	if (nid == NUMA_NO_NODE)
>-		nid = memory_add_physaddr_to_nid(addr);
> 
> 	/*
> 	 * When force-unloading the driver and we still have memory added to
>@@ -423,7 +419,8 @@ static int virtio_mem_mb_add(struct virtio_mem *vm, unsigned long mb_id)
> 	}
> 
> 	dev_dbg(&vm->vdev->dev, "adding memory block: %lu\n", mb_id);
>-	return add_memory_driver_managed(nid, addr, memory_block_size_bytes(),
>+	return add_memory_driver_managed(vm->nid, addr,
>+					 memory_block_size_bytes(),
> 					 vm->resource_name,
> 					 MEMHP_MERGE_RESOURCE);
> }
>@@ -440,13 +437,9 @@ static int virtio_mem_mb_add(struct virtio_mem *vm, unsigned long mb_id)
> static int virtio_mem_mb_remove(struct virtio_mem *vm, unsigned long mb_id)
> {
> 	const uint64_t addr = virtio_mem_mb_id_to_phys(mb_id);
>-	int nid = vm->nid;
>-
>-	if (nid == NUMA_NO_NODE)
>-		nid = memory_add_physaddr_to_nid(addr);
> 
> 	dev_dbg(&vm->vdev->dev, "removing memory block: %lu\n", mb_id);
>-	return remove_memory(nid, addr, memory_block_size_bytes());
>+	return remove_memory(vm->nid, addr, memory_block_size_bytes());
> }
> 
> /*
>@@ -461,14 +454,11 @@ static int virtio_mem_mb_offline_and_remove(struct virtio_mem *vm,
> 					    unsigned long mb_id)
> {
> 	const uint64_t addr = virtio_mem_mb_id_to_phys(mb_id);
>-	int nid = vm->nid;
>-
>-	if (nid == NUMA_NO_NODE)
>-		nid = memory_add_physaddr_to_nid(addr);
> 
> 	dev_dbg(&vm->vdev->dev, "offlining and removing memory block: %lu\n",
> 		mb_id);
>-	return offline_and_remove_memory(nid, addr, memory_block_size_bytes());
>+	return offline_and_remove_memory(vm->nid, addr,
>+					 memory_block_size_bytes());
> }
> 
> /*
>@@ -1659,6 +1649,10 @@ static int virtio_mem_init(struct virtio_mem *vm)
> 	virtio_cread_le(vm->vdev, struct virtio_mem_config, region_size,
> 			&vm->region_size);
> 
>+	/* Determine the nid for the device based on the lowest address. */
>+	if (vm->nid == NUMA_NO_NODE)
>+		vm->nid = memory_add_physaddr_to_nid(vm->addr);
>+
> 	/*
> 	 * We always hotplug memory in memory block granularity. This way,
> 	 * we have to wait for exactly one memory block to online.
>@@ -1707,7 +1701,7 @@ static int virtio_mem_init(struct virtio_mem *vm)
> 		 memory_block_size_bytes());
> 	dev_info(&vm->vdev->dev, "subblock size: 0x%llx",
> 		 (unsigned long long)vm->subblock_size);
>-	if (vm->nid != NUMA_NO_NODE)
>+	if (vm->nid != NUMA_NO_NODE && IS_ENABLED(CONFIG_NUMA))
> 		dev_info(&vm->vdev->dev, "nid: %d", vm->nid);
> 
> 	return 0;
>-- 
>2.26.2

-- 
Wei Yang
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