From 533cc72122c01245efe79510fae1dd11e90dc405 Mon Sep 17 00:00:00 2001 From: Fan Du Date: Wed, 21 Jul 2021 17:43:07 +0800 Subject: [PATCH] mm: export node type {pmem|dram} under /sys/bus/node euleros inclusion category: feature feature: etmem bugzilla: 48246 ------------------------------------------------- User space migration daemon could check /sys/bus/node/devices/nodeX/type for node type. Software can interrogate node type for node memory type and distance to get desirable target node in migration. grep -r . /sys/devices/system/node/*/type /sys/devices/system/node/node0/type:dram /sys/devices/system/node/node1/type:dram /sys/devices/system/node/node2/type:pmem /sys/devices/system/node/node3/type:pmem Along with next patch which export `peer_node`, migration daemon could easily find the memory type of current node, and the target node in case of migration. grep -r . /sys/devices/system/node/*/peer_node /sys/devices/system/node/node0/peer_node:2 /sys/devices/system/node/node1/peer_node:3 /sys/devices/system/node/node2/peer_node:0 /sys/devices/system/node/node3/peer_node:1 Signed-off-by: Fan Du Signed-off-by: Fengguang Wu Signed-off-by: Kemeng Shi Reviewed-by: louhongxiang --- drivers/base/node.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/base/node.c b/drivers/base/node.c index 21965de8538b..4014a98be61d 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -549,6 +549,15 @@ static ssize_t node_read_distance(struct device *dev, } static DEVICE_ATTR(distance, 0444, node_read_distance, NULL); +static ssize_t type_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int nid = dev->id; + + return sprintf(buf, is_node_pmem(nid) ? "pmem\n" : "dram\n"); +} +static DEVICE_ATTR_RO(type); + static struct attribute *node_dev_attrs[] = { &dev_attr_cpumap.attr, &dev_attr_cpulist.attr, @@ -556,6 +565,7 @@ static struct attribute *node_dev_attrs[] = { &dev_attr_numastat.attr, &dev_attr_distance.attr, &dev_attr_vmstat.attr, + &dev_attr_type.attr, NULL }; ATTRIBUTE_GROUPS(node_dev); -- GitLab