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Date: Tue, 30 Oct 2012 18:50:44 +0900 From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com> To: Lai Jiangshan <laijs@...fujitsu.com> CC: Mel Gorman <mgorman@...e.de>, David Rientjes <rientjes@...gle.com>, LKML <linux-kernel@...r.kernel.org>, x86 maintainers <x86@...nel.org>, Jiang Liu <jiang.liu@...wei.com>, Rusty Russell <rusty@...tcorp.com.au>, Yinghai Lu <yinghai@...nel.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [V5 PATCH 00/26] mm, memory-hotplug: dynamic configure movable memory and introduce movable node HI Lai, The patch-set is huge. Therefore, we hesitate to read the patch-set. I think the patch-set has multiple feature developments. - Development of online_movable [PATCH 1 - 3] - Cleanup node_state_attr [PATCH 4] - Introduce N_MEMORY [PATCH 5 - 18] - Development of kernelcore_max_addr [PATCH 19 - 25] - Bug fix [PATCH 26] Why don't you separate the patch-set into each feature development? By separating the patch-set, many people can easily participate in your development. Thanks, Yasuaki Ishimatsu 2012/10/30 0:07, Lai Jiangshan wrote: > Movable memory is a very important concept of memory-management, > we need to consolidate it and make use of it on systems. > > Movable memory is needed for > o anti-fragmentation(hugepage, big-order allocation...) > o logic hot-remove(virtualization, Memory capacity on Demand) > o physic hot-remove(power-saving, hardware partitioning, hardware fault management) > > All these require dynamic configuring the memory and making better utilities of memories > and safer. We also need physic hot-remove, so we need movable node too. > (Although some systems support physic-memory-migration, we don't require all > memory on physic-node is movable, but movable node is still needed here > for logic-node if we want to make physic-migration is transparent) > > We add dynamic configuration commands "online_movalbe" and "online_kernel". > We also add non-dynamic boot option kernelcore_max_addr. > We may add some more dynamic/non-dynamic configuration in future. > > > The patchset is based on 3.7-rc3 with these three patches already applied: > https://lkml.org/lkml/2012/10/24/151 > https://lkml.org/lkml/2012/10/26/150 > > You can also simply pull all the patches from: > git pull https://github.com/laijs/linux.git hotplug-next > > > > Issues): > > mempolicy(M_BIND) don't act well when the nodemask has movable nodes only, > the kernel allocation will fail and the task can't create new task or other > kernel objects. > > So we change the strategy/policy > when the bound nodemask has movable node(s) only, we only > apply mempolicy for userspace allocation, don't apply it > for kernel allocation. > > CPUSET also has the same problem, but the code spread in page_alloc.c, > and we doesn't fix it yet, we can/will change allocation strategy to one of > these 3 strategies: > 1) the same strategy as mempolicy > 2) change cpuset, make nodemask always has at least a normal node > 3) split nodemask: nodemask_user and nodemask_kernel > > Thoughts? > > > > Patches): > > patch1-3: add online_movable and online_kernel, bot don't result movable node > Patch4 cleanup for node_state_attr > Patch5 introduce N_MEMORY > Patch6-17 use N_MEMORY instead N_HIGH_MEMORY. > The patches are separated by subsystem, > Patch18 also changes the node_states initialization > Patch18-20 Add MOVABLE-dedicated node > Patch21-25 Add kernelcore_max_addr > patch26: mempolicy handle movable node > > > > > Changes): > > change V5-V4: > consolidate online_movable/online_kernel > nodemask management > > change V4-v3 > rebase. > online_movable/online_kernel can create a zone from empty > or empyt a zone > > change V3-v2: > Proper nodemask management > > change V2-V1: > > The original V1 patchset of MOVABLE-dedicated node is here: > http://comments.gmane.org/gmane.linux.kernel.mm/78122 > > The new V2 adds N_MEMORY and a notion of "MOVABLE-dedicated node". > And fix some related problems. > > The orignal V1 patchset of "add online_movable" is here: > https://lkml.org/lkml/2012/7/4/145 > > The new V2 discards the MIGRATE_HOTREMOVE approach, and use a more straight > implementation(only 1 patch). > > > > Lai Jiangshan (22): > mm, memory-hotplug: dynamic configure movable memory and portion > memory > memory_hotplug: handle empty zone when online_movable/online_kernel > memory_hotplug: ensure every online node has NORMAL memory > node: cleanup node_state_attr > 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 > numa: add CONFIG_MOVABLE_NODE for movable-dedicated node > memory_hotplug: allow online/offline memory to result movable node > page_alloc: add kernelcore_max_addr > mempolicy: fix is_valid_nodemask() > > Yasuaki Ishimatsu (4): > x86: get pg_data_t's memory from other node > x86: use memblock_set_current_limit() to set memblock.current_limit > memblock: limit memory address from memblock > memblock: compare current_limit with end variable at > memblock_find_in_range_node() > > Documentation/cgroups/cpusets.txt | 2 +- > Documentation/kernel-parameters.txt | 9 + > Documentation/memory-hotplug.txt | 19 ++- > arch/x86/kernel/setup.c | 4 +- > arch/x86/mm/init_64.c | 4 +- > arch/x86/mm/numa.c | 8 +- > drivers/base/memory.c | 27 ++-- > drivers/base/node.c | 28 ++-- > fs/proc/kcore.c | 2 +- > fs/proc/task_mmu.c | 4 +- > include/linux/cpuset.h | 2 +- > include/linux/memblock.h | 1 + > include/linux/memory.h | 1 + > include/linux/memory_hotplug.h | 13 ++- > include/linux/nodemask.h | 5 + > init/main.c | 2 +- > kernel/cpuset.c | 32 ++-- > kernel/kthread.c | 2 +- > mm/Kconfig | 8 + > mm/hugetlb.c | 24 ++-- > mm/memblock.c | 10 +- > mm/memcontrol.c | 18 +- > mm/memory_hotplug.c | 283 +++++++++++++++++++++++++++++++++-- > mm/mempolicy.c | 48 ++++--- > mm/migrate.c | 2 +- > mm/oom_kill.c | 2 +- > mm/page_alloc.c | 76 +++++++--- > mm/page_cgroup.c | 2 +- > mm/vmscan.c | 4 +- > mm/vmstat.c | 4 +- > 30 files changed, 508 insertions(+), 138 deletions(-) > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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