[RFC 8/8] mm: Add N_COHERENT_DEVICE node type into node_states[]
From: Anshuman Khandual <hidden>
Date: 2016-10-24 04:32:43
Also in:
lkml
Subsystem:
bitmap api, driver core, kobjects, debugfs and sysfs, memory hot(un)plug, memory management, the rest · Maintainers:
Yury Norov, Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, David Hildenbrand, Oscar Salvador, Andrew Morton, Linus Torvalds
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 <redacted> --- 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@kvack.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@kvack.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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