Messages in this thread Patch in this message | | | From | Balbir Singh <> | Date | Fri, 20 Jul 2007 13:54:54 +0530 | Subject | [RFC][-mm PATCH 5/8] Memory controller task migration (v3) |
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Allow tasks to migrate from one container to the other. We migrate mm_struct's mem_container only when the thread group id migrates.
Signed-off-by: <balbir@linux.vnet.ibm.com> ---
mm/memcontrol.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+)
diff -puN mm/memcontrol.c~mem-control-task-migration mm/memcontrol.c --- linux-2.6.22-rc6/mm/memcontrol.c~mem-control-task-migration 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/memcontrol.c 2007-07-20 13:13:25.000000000 +0530 @@ -309,11 +309,46 @@ err: return rc; } +static void mem_container_move_task(struct container_subsys *ss, + struct container *cont, + struct container *old_cont, + struct task_struct *p) +{ + struct mm_struct *mm; + struct mem_container *mem, *old_mem; + + mm = get_task_mm(p); + if (mm == NULL) + return; + + mem = mem_container_from_cont(cont); + old_mem = mem_container_from_cont(old_cont); + + if (mem == old_mem) + goto out; + + /* + * Only thread group leaders are allowed to migrate, the mm_struct is + * in effect owned by the leader + */ + if (p->tgid != p->pid) + goto out; + + css_get(&mem->css); + rcu_assign_pointer(mm->mem_container, mem); + css_put(&old_mem->css); + +out: + mmput(mm); + return; +} + struct container_subsys mem_container_subsys = { .name = "mem_container", .subsys_id = mem_container_subsys_id, .create = mem_container_create, .destroy = mem_container_destroy, .populate = mem_container_populate, + .attach = mem_container_move_task, .early_init = 1, }; _ -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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