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Date: Mon, 24 Oct 2016 10:01:57 +0530 From: Anshuman Khandual <khandual@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org, linux-mm@...ck.org Cc: mhocko@...e.com, js1304@...il.com, vbabka@...e.cz, mgorman@...e.de, minchan@...nel.org, akpm@...ux-foundation.org, aneesh.kumar@...ux.vnet.ibm.com, bsingharora@...il.com Subject: [RFC 8/8] mm: Add N_COHERENT_DEVICE node type into node_states[] Add a new member N_COHERENT_DEVICE into node_states[] nodemask array to enlist all those nodes which contain only coherent device memory. Also creates a new sysfs interface /sys/devices/system/node/is_coherent_device to list down all those nodes which has coherent device memory. Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com> --- Documentation/ABI/stable/sysfs-devices-node | 7 +++++++ drivers/base/node.c | 6 ++++++ include/linux/nodemask.h | 3 +++ mm/memory_hotplug.c | 10 ++++++++++ 4 files changed, 26 insertions(+) diff --git a/Documentation/ABI/stable/sysfs-devices-node b/Documentation/ABI/stable/sysfs-devices-node index 5b2d0f0..5538791 100644 --- a/Documentation/ABI/stable/sysfs-devices-node +++ b/Documentation/ABI/stable/sysfs-devices-node @@ -29,6 +29,13 @@ Description: Nodes that have regular or high memory. Depends on CONFIG_HIGHMEM. +What: /sys/devices/system/node/is_coherent_device +Date: October 2016 +Contact: Linux Memory Management list <linux-mm@...ck.org> +Description: + Lists the nodemask of nodes that have coherent memory. + Depends on CONFIG_COHERENT_DEVICE. + What: /sys/devices/system/node/nodeX Date: October 2002 Contact: Linux Memory Management list <linux-mm@...ck.org> diff --git a/drivers/base/node.c b/drivers/base/node.c index 5548f96..5b5dd89 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -661,6 +661,9 @@ static struct node_attr node_state_attr[] = { [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY), #endif [N_CPU] = _NODE_ATTR(has_cpu, N_CPU), +#ifdef CONFIG_COHERENT_DEVICE + [N_COHERENT_DEVICE] = _NODE_ATTR(is_coherent_device, N_COHERENT_DEVICE), +#endif }; static struct attribute *node_state_attrs[] = { @@ -674,6 +677,9 @@ static struct attribute *node_state_attrs[] = { &node_state_attr[N_MEMORY].attr.attr, #endif &node_state_attr[N_CPU].attr.attr, +#ifdef CONFIG_COHERENT_DEVICE + &node_state_attr[N_COHERENT_DEVICE].attr.attr, +#endif NULL }; diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h index f746e44..605cb0d 100644 --- a/include/linux/nodemask.h +++ b/include/linux/nodemask.h @@ -393,6 +393,9 @@ enum node_states { N_MEMORY = N_HIGH_MEMORY, #endif N_CPU, /* The node has one or more cpus */ +#ifdef CONFIG_COHERENT_DEVICE + N_COHERENT_DEVICE, /* The node has coherent device memory */ +#endif NR_NODE_STATES }; diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 9629273..8f03962 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1044,6 +1044,11 @@ static void node_states_set_node(int node, struct memory_notify *arg) if (arg->status_change_nid_high >= 0) node_set_state(node, N_HIGH_MEMORY); +#ifdef CONFIG_COHERENT_DEVICE + if (isolated_cdm_node(node)) + node_set_state(node, N_COHERENT_DEVICE); +#endif + node_set_state(node, N_MEMORY); } @@ -1858,6 +1863,11 @@ static void node_states_clear_node(int node, struct memory_notify *arg) if ((N_MEMORY != N_HIGH_MEMORY) && (arg->status_change_nid >= 0)) node_clear_state(node, N_MEMORY); + +#ifdef CONFIG_COHERENT_DEVICE + if (isolated_cdm_node(node)) + node_clear_state(node, N_COHERENT_DEVICE); +#endif } static int __ref __offline_pages(unsigned long start_pfn, -- 2.1.0
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