This patch is part3 of the following patchset: https://lkml.org/lkml/2012/10/29/319 Part1 is here: https://lkml.org/lkml/2012/10/31/30 Part2 is here: https://lkml.org/lkml/2012/10/31/73 Part4 is here: https://lkml.org/lkml/2012/10/31/129 Part5 is here: https://lkml.org/lkml/2012/10/31/145 Part6 is here: https://lkml.org/lkml/2012/10/31/248 You can apply this patchset without the other parts. Note: part1 and part2 are in mm tree now. part5 are being reimplemented(We will post it some days later). We need a node which only contains movable memory. This feature is very important for node hotplug. So we will add a new nodemask for all memory. N_MEMORY contains movable memory but N_HIGH_MEMORY doesn't contain it. The meaning of N_MEMORY and N_HIGH_MEMORY nodemask: 1. N_HIGH_MEMORY: the node contains the memory that kernel can use. movable node aren't in this nodemask. 2. N_MEMORY: the node contains memory. Why we intrdouce a new nodemask, not rename N_HIGH_MEMORY to N_MEMORY? See the following two codes: 1. ========================== static void *__meminit alloc_page_cgroup(size_t size, int nid) { gfp_t flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN; void *addr = NULL; addr = alloc_pages_exact_nid(nid, size, flags); if (addr) { kmemleak_alloc(addr, size, 1, flags); return addr; } if (node_state(nid, N_HIGH_MEMORY)) addr = vzalloc_node(size, nid); else addr = vzalloc(size); return addr; } ========================== If the node only has ZONE_MOVABLE memory, we should use vzalloc(). So we should have a mask that stores the node which has memory that the kernel can use. 2. ========================== static int mpol_set_nodemask(struct mempolicy *pol, const nodemask_t *nodes, struct nodemask_scratch *nsc) { int ret; /* if mode is MPOL_DEFAULT, pol is NULL. This is right. */ if (pol == NULL) return 0; /* Check N_HIGH_MEMORY */ nodes_and(nsc->mask1, cpuset_current_mems_allowed, node_states[N_HIGH_MEMORY]); ... if (pol->flags & MPOL_F_RELATIVE_NODES) mpol_relative_nodemask(&nsc->mask2, nodes,&nsc->mask1); else nodes_and(nsc->mask2, *nodes, nsc->mask1); ... } ========================== If the user specifies 2 nodes: one has ZONE_MOVABLE memory, and the other one doesn't. The cpuset for this task contains all nodes. nsc->mask2 should contain these 2 nodes. So we should hava a mask that store the node which has memory, and use this mask to calculate nsc->mask1. The movable node will implemtent in part4. So N_MEMORY is equal to N_HIGH_MEMORY now. Changes from v1 to v2: 1. add your Signed-off-by, because I am on the the patch delivery path. Andrew Morton tells me this. 2. patch13: The newest kernel adds some codes which use N_HIGH_MEMORY. It shoule be N_MEMORY now. Lai Jiangshan (14): node_states: introduce N_MEMORY cpuset: use N_MEMORY instead N_HIGH_MEMORY procfs: use N_MEMORY instead N_HIGH_MEMORY memcontrol: use N_MEMORY instead N_HIGH_MEMORY oom: use N_MEMORY instead N_HIGH_MEMORY mm,migrate: use N_MEMORY instead N_HIGH_MEMORY mempolicy: use N_MEMORY instead N_HIGH_MEMORY hugetlb: use N_MEMORY instead N_HIGH_MEMORY vmstat: use N_MEMORY instead N_HIGH_MEMORY kthread: use N_MEMORY instead N_HIGH_MEMORY init: use N_MEMORY instead N_HIGH_MEMORY vmscan: use N_MEMORY instead N_HIGH_MEMORY page_alloc: use N_MEMORY instead N_HIGH_MEMORY change the node_states initialization hotplug: update nodemasks management Documentation/cgroups/cpusets.txt | 2 +- Documentation/memory-hotplug.txt | 5 ++- arch/x86/mm/init_64.c | 4 +- drivers/base/node.c | 2 +- fs/proc/kcore.c | 2 +- fs/proc/task_mmu.c | 4 +- include/linux/cpuset.h | 2 +- include/linux/memory.h | 1 + include/linux/nodemask.h | 1 + init/main.c | 2 +- kernel/cpuset.c | 32 +++++++------- kernel/kthread.c | 2 +- mm/hugetlb.c | 24 +++++------ mm/memcontrol.c | 18 ++++---- mm/memory_hotplug.c | 87 ++++++++++++++++++++++++++++++++------- mm/mempolicy.c | 12 +++--- mm/migrate.c | 2 +- mm/oom_kill.c | 2 +- mm/page_alloc.c | 42 ++++++++++--------- mm/page_cgroup.c | 2 +- mm/vmscan.c | 4 +- mm/vmstat.c | 4 +- 22 files changed, 162 insertions(+), 94 deletions(-) -- 1.8.0 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html