X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/d0ffc37686edcc803601f76ab51fdfed5fc2f241..e56688e01d046ac64bcdcc723e21b8663b9c2f61:/src/msg/msg_vm.c diff --git a/src/msg/msg_vm.c b/src/msg/msg_vm.c index d5bff3559c..7909bb5d63 100644 --- a/src/msg/msg_vm.c +++ b/src/msg/msg_vm.c @@ -1,227 +1,1151 @@ -/* Copyright (c) 2012-2013. The SimGrid Team. +/* Copyright (c) 2012-2014. The SimGrid Team. * All rights reserved. */ /* This program is free software; you can redistribute it and/or modify it * under the terms of the license (GNU LGPL) which comes with this package. */ +/* TODO: + * 1. add the support of trace + * 2. use parallel tasks to simulate CPU overhead and remove the very + * experimental code generating micro computation tasks + */ + + + #include "msg_private.h" #include "xbt/sysdep.h" #include "xbt/log.h" +#include "simgrid/platf.h" XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_vm, msg, "Cloud-oriented parts of the MSG API"); -/** @brief Create a new (empty) VMs. - * @ingroup msg_VMs + +/* **** ******** GENERAL ********* **** */ + +/** \ingroup m_vm_management + * \brief Returns the value of a given vm property * - * @bug it is expected that in the future, the coreAmount parameter will be used - * to add extra constraints on the execution, but the argument is ignored for now. + * \param vm a vm + * \param name a property name + * \return value of a property (or NULL if property not set) */ -msg_vm_t MSG_vm_start(msg_host_t location, const char *name, int coreAmount) { - msg_vm_t res = xbt_new0(s_msg_vm_t,1); - res->all_vms_hookup.prev = NULL; - res->host_vms_hookup.prev = NULL; - res->state = msg_vm_state_running; - res->location = location; - res->coreAmount = coreAmount; - res->name = xbt_strdup(name); - res->processes = xbt_dynar_new(sizeof(msg_process_t),NULL); +const char *MSG_vm_get_property_value(msg_vm_t vm, const char *name) +{ + return MSG_host_get_property_value(vm, name); +} + +/** \ingroup m_vm_management + * \brief Returns a xbt_dict_t consisting of the list of properties assigned to this host + * + * \param vm a vm + * \return a dict containing the properties + */ +xbt_dict_t MSG_vm_get_properties(msg_vm_t vm) +{ + xbt_assert((vm != NULL), "Invalid parameters (vm is NULL)"); - xbt_swag_insert(res,msg_global->vms); - xbt_swag_insert(res, MSG_host_priv(location)->vms); + return (simcall_host_get_properties(vm)); +} - #ifdef HAVE_TRACING - TRACE_msg_vm_create(name, location); - #endif +/** \ingroup m_host_management + * \brief Change the value of a given host property + * + * \param vm a vm + * \param name a property name + * \param value what to change the property to + * \param free_ctn the freeing function to use to kill the value on need + */ +void MSG_vm_set_property_value(msg_vm_t vm, const char *name, void *value, void_f_pvoid_t free_ctn) +{ + xbt_dict_set(MSG_host_get_properties(vm), name, value, free_ctn); +} +/** \ingroup msg_vm_management + * \brief Finds a msg_vm_t using its name. + * + * This is a name directory service + * \param name the name of a vm. + * \return the corresponding vm + * + * Please note that a VM is a specific host. Hence, you should give a different name + * for each VM/PM. + */ - return res; +msg_vm_t MSG_vm_get_by_name(const char *name) +{ + return MSG_get_host_by_name(name); } -/** @brief Returns a newly constructed dynar containing all existing VMs in the system. - * @ingroup msg_VMs + +/** \ingroup m_vm_management + * + * \brief Return the name of the #msg_host_t. * - * Don't forget to free the dynar after use. + * This functions checks whether \a host is a valid pointer or not and return + its name. */ -xbt_dynar_t MSG_vms_as_dynar(void) { - xbt_dynar_t res = xbt_dynar_new(sizeof(msg_vm_t),NULL); - msg_vm_t vm; - xbt_swag_foreach(vm,msg_global->vms) { - xbt_dynar_push(res,&vm); - } - return res; +const char *MSG_vm_get_name(msg_vm_t vm) +{ + return MSG_host_get_name(vm); } -/** @brief Returns whether the given VM is currently suspended + +/* **** Check state of a VM **** */ +static inline int __MSG_vm_is_state(msg_vm_t vm, e_surf_vm_state_t state) +{ + return simcall_vm_get_state(vm) == state; +} + +/** @brief Returns whether the given VM has just created, not running. * @ingroup msg_VMs */ -int MSG_vm_is_suspended(msg_vm_t vm) { - return vm->state == msg_vm_state_suspended; +int MSG_vm_is_created(msg_vm_t vm) +{ + return __MSG_vm_is_state(vm, SURF_VM_STATE_CREATED); } + /** @brief Returns whether the given VM is currently running * @ingroup msg_VMs */ -int MSG_vm_is_running(msg_vm_t vm) { - return vm->state == msg_vm_state_running; +int MSG_vm_is_running(msg_vm_t vm) +{ + return __MSG_vm_is_state(vm, SURF_VM_STATE_RUNNING); +} + +/** @brief Returns whether the given VM is currently migrating + * @ingroup msg_VMs + */ +int MSG_vm_is_migrating(msg_vm_t vm) +{ + msg_host_priv_t priv = msg_host_resource_priv(vm); + return priv->is_migrating; +} + +/** @brief Returns whether the given VM is currently suspended, not running. + * @ingroup msg_VMs + */ +int MSG_vm_is_suspended(msg_vm_t vm) +{ + return __MSG_vm_is_state(vm, SURF_VM_STATE_SUSPENDED); +} + +/** @brief Returns whether the given VM is being saved (FIXME: live saving or not?). + * @ingroup msg_VMs + */ +int MSG_vm_is_saving(msg_vm_t vm) +{ + return __MSG_vm_is_state(vm, SURF_VM_STATE_SAVING); +} + +/** @brief Returns whether the given VM has been saved, not running. + * @ingroup msg_VMs + */ +int MSG_vm_is_saved(msg_vm_t vm) +{ + return __MSG_vm_is_state(vm, SURF_VM_STATE_SAVED); } -/** @brief Add the given process into the VM. + +/** @brief Returns whether the given VM is being restored, not running. * @ingroup msg_VMs + */ +int MSG_vm_is_restoring(msg_vm_t vm) +{ + return __MSG_vm_is_state(vm, SURF_VM_STATE_RESTORING); +} + + + +/* ------------------------------------------------------------------------- */ +/* ------------------------------------------------------------------------- */ + +/* **** ******** MSG vm actions ********* **** */ + +/** @brief Create a new VM with specified parameters. + * @ingroup msg_VMs* + * All parameters are in MBytes * - * Afterward, when the VM is migrated or suspended or whatever, the process will have the corresponding handling, too. + */ +msg_vm_t MSG_vm_create(msg_host_t ind_pm, const char *name, + int ncpus, int ramsize, + int net_cap, char *disk_path, int disksize, + int mig_netspeed, int dp_intensity) +{ + /* For the moment, intensity_rate is the percentage against the migration + * bandwidth */ + double host_speed = MSG_get_host_speed(ind_pm); + double update_speed = ((double)dp_intensity/100) * mig_netspeed; + + msg_vm_t vm = MSG_vm_create_core(ind_pm, name); + s_ws_params_t params; + memset(¶ms, 0, sizeof(params)); + params.ramsize = (sg_size_t)ramsize * 1024 * 1024; + //params.overcommit = 0; + params.devsize = 0; + params.skip_stage2 = 0; + params.max_downtime = 0.03; + params.dp_rate = (update_speed * 1024 * 1024) / host_speed; + params.dp_cap = params.ramsize * 0.9; // assume working set memory is 90% of ramsize + params.mig_speed = (double)mig_netspeed * 1024 * 1024; // mig_speed + + //XBT_INFO("dp rate %f migspeed : %f intensity mem : %d, updatespeed %f, hostspeed %f",params.dp_rate, params.mig_speed, dp_intensity, update_speed, host_speed); + simcall_host_set_params(vm, ¶ms); + + return vm; +} + + +/** @brief Create a new VM object. The VM is not yet started. The resource of the VM is allocated upon MSG_vm_start(). + * @ingroup msg_VMs* * + * A VM is treated as a host. The name of the VM must be unique among all hosts. */ -void MSG_vm_bind(msg_vm_t vm, msg_process_t process) { - /* check if the process is already in a VM */ - simdata_process_t simdata = simcall_process_get_data(process); - if (simdata->vm) { - msg_vm_t old_vm = simdata->vm; - int pos = xbt_dynar_search(old_vm->processes,&process); - xbt_dynar_remove_at(old_vm->processes,pos, NULL); +msg_vm_t MSG_vm_create_core(msg_host_t ind_pm, const char *name) +{ + /* make sure the VM of the same name does not exit */ + { + xbt_dictelm_t ind_host_tmp = xbt_lib_get_elm_or_null(host_lib, name); + if (ind_host_tmp && xbt_lib_get_level(ind_host_tmp, SIMIX_HOST_LEVEL) != NULL) { + XBT_ERROR("host %s already exits", name); + return NULL; + } } - /* check if the host is in the right host */ - if (simdata->m_host != vm->location) { - MSG_process_migrate(process,vm->location); + + /* Note: ind_vm and vm_workstation point to the same elm object. */ + msg_vm_t ind_vm = NULL; + void *ind_vm_workstation = NULL; + + /* Ask the SIMIX layer to create the surf vm resource */ + ind_vm_workstation = simcall_vm_create(name, ind_pm); + ind_vm = (msg_vm_t) __MSG_host_create(ind_vm_workstation); + + XBT_DEBUG("A new VM (%s) has been created", name); + + #ifdef HAVE_TRACING + TRACE_msg_vm_create(name, ind_pm); + #endif + + return ind_vm; +} + +/** @brief Destroy a VM. Destroy the VM object from the simulation. + * @ingroup msg_VMs + */ +void MSG_vm_destroy(msg_vm_t vm) +{ + if (MSG_vm_is_migrating(vm)) + THROWF(vm_error, 0, "VM(%s) is migrating", sg_host_name(vm)); + + /* First, terminate all processes on the VM if necessary */ + if (MSG_vm_is_running(vm)) + simcall_vm_shutdown(vm); + + if (!MSG_vm_is_created(vm)) { + XBT_CRITICAL("shutdown the given VM before destroying it"); + DIE_IMPOSSIBLE; } - simdata->vm = vm; - XBT_DEBUG("binding Process %s to %p",MSG_process_get_name(process),vm); + /* Then, destroy the VM object */ + simcall_vm_destroy(vm); - xbt_dynar_push_as(vm->processes,msg_process_t,process); + __MSG_host_destroy(vm); + + #ifdef HAVE_TRACING + TRACE_msg_vm_end(vm); + #endif } -/** @brief Removes the given process from the given VM, and kill it + + +/** @brief Start a vm (i.e., boot the guest operating system) + * @ingroup msg_VMs + * + * If the VM cannot be started, an exception is generated. + * + */ +void MSG_vm_start(msg_vm_t vm) +{ + simcall_vm_start(vm); + + #ifdef HAVE_TRACING + TRACE_msg_vm_start(vm); + #endif +} + + + +/** @brief Immediately kills all processes within the given VM. Any memory that they allocated will be leaked. * @ingroup msg_VMs * - * Will raise a not_found exception if the process were not bound to that VM + * FIXME: No extra delay occurs. If you want to simulate this too, you want to + * use a #MSG_process_sleep() or something. I'm not quite sure. */ -void MSG_vm_unbind(msg_vm_t vm, msg_process_t process) { - int pos = xbt_dynar_search(vm->processes,process); - xbt_dynar_remove_at(vm->processes,pos, NULL); - MSG_process_kill(process); +void MSG_vm_shutdown(msg_vm_t vm) +{ + /* msg_vm_t equals to msg_host_t */ + simcall_vm_shutdown(vm); + + // #ifdef HAVE_TRACING + // TRACE_msg_vm_(vm); + // #endif +} + + + +/* We have two mailboxes. mbox is used to transfer migration data between + * source and destination PMs. mbox_ctl is used to detect the completion of a + * migration. The names of these mailboxes must not conflict with others. */ +static inline char *get_mig_mbox_src_dst(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm) +{ + char *vm_name = sg_host_name(vm); + char *src_pm_name = sg_host_name(src_pm); + char *dst_pm_name = sg_host_name(dst_pm); + + return bprintf("__mbox_mig_src_dst:%s(%s-%s)", vm_name, src_pm_name, dst_pm_name); +} + +static inline char *get_mig_mbox_ctl(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm) +{ + char *vm_name = sg_host_name(vm); + char *src_pm_name = sg_host_name(src_pm); + char *dst_pm_name = sg_host_name(dst_pm); + + return bprintf("__mbox_mig_ctl:%s(%s-%s)", vm_name, src_pm_name, dst_pm_name); +} + +static inline char *get_mig_process_tx_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm) +{ + char *vm_name = sg_host_name(vm); + char *src_pm_name = sg_host_name(src_pm); + char *dst_pm_name = sg_host_name(dst_pm); + + return bprintf("__pr_mig_tx:%s(%s-%s)", vm_name, src_pm_name, dst_pm_name); +} + +static inline char *get_mig_process_rx_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm) +{ + char *vm_name = sg_host_name(vm); + char *src_pm_name = sg_host_name(src_pm); + char *dst_pm_name = sg_host_name(dst_pm); + + return bprintf("__pr_mig_rx:%s(%s-%s)", vm_name, src_pm_name, dst_pm_name); +} + +static inline char *get_mig_task_name(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm, int stage) +{ + char *vm_name = sg_host_name(vm); + char *src_pm_name = sg_host_name(src_pm); + char *dst_pm_name = sg_host_name(dst_pm); + + return bprintf("__task_mig_stage%d:%s(%s-%s)", stage, vm_name, src_pm_name, dst_pm_name); +} + + +struct migration_session { + msg_vm_t vm; + msg_host_t src_pm; + msg_host_t dst_pm; + + /* The miration_rx process uses mbox_ctl to let the caller of do_migration() + * know the completion of the migration. */ + char *mbox_ctl; + /* The migration_rx and migration_tx processes use mbox to transfer migration + * data. */ + char *mbox; +}; + + +static int migration_rx_fun(int argc, char *argv[]) +{ + XBT_DEBUG("mig: rx_start"); + + // The structure has been created in the do_migration function and should only be freed in the same place ;) + struct migration_session *ms = MSG_process_get_data(MSG_process_self()); + + s_ws_params_t params; + simcall_host_get_params(ms->vm, ¶ms); + + int need_exit = 0; + + char *finalize_task_name = get_mig_task_name(ms->vm, ms->src_pm, ms->dst_pm, 3); + + int ret = 0; + for (;;) { + msg_task_t task = NULL; + ret = MSG_task_recv(&task, ms->mbox); + { + if (ret != MSG_OK) { + // An error occured, clean the code and return + // The owner did not change, hence the task should be only destroyed on the other side + xbt_free(finalize_task_name); + return 0; + } + } + + if (strcmp(task->name, finalize_task_name) == 0) + need_exit = 1; + + MSG_task_destroy(task); + + if (need_exit) + break; + } + + // Here Stage 1, 2 and 3 have been performed. + // Hence complete the migration + + // Copy the reference to the vm (if SRC crashes now, do_migration will free ms) + // This is clearly ugly but I (Adrien) need more time to do something cleaner (actually we should copy the whole ms structure at the begining and free it at the end of each function) + msg_vm_t vm = ms->vm; + msg_host_t src_pm = ms->src_pm; + msg_host_t dst_pm = ms-> dst_pm; + msg_host_priv_t priv = msg_host_resource_priv(vm); + +// TODO: we have an issue, if the DST node is turning off during the three next calls, then the VM is in an inconsistent state +// I should check with Takahiro in order to make this portion of code atomic + /* deinstall the current affinity setting for the CPU */ + simcall_vm_set_affinity(vm, src_pm, 0); + + /* Update the vm location */ + simcall_vm_migrate(vm, dst_pm); + + /* Resume the VM */ + simcall_vm_resume(vm); + + /* install the affinity setting of the VM on the destination pm */ + { + + unsigned long affinity_mask = (unsigned long) xbt_dict_get_or_null_ext(priv->affinity_mask_db, (char *)dst_pm, sizeof(msg_host_t)); + simcall_vm_set_affinity(vm, dst_pm, affinity_mask); + XBT_DEBUG("set affinity(0x%04lx@%s) for %s", affinity_mask, MSG_host_get_name(dst_pm), MSG_host_get_name(vm)); + } + + { + + // Now the VM is running on the new host (the migration is completed) (even if the SRC crash) + msg_host_priv_t priv = msg_host_resource_priv(vm); + priv->is_migrating = 0; + XBT_DEBUG("VM(%s) moved from PM(%s) to PM(%s)", ms->vm->key, ms->src_pm->key, ms->dst_pm->key); + #ifdef HAVE_TRACING + TRACE_msg_vm_change_host(ms->vm, ms->src_pm, ms->dst_pm); + #endif + + } + // Inform the SRC that the migration has been correctly performed + { + char *task_name = get_mig_task_name(ms->vm, ms->src_pm, ms->dst_pm, 4); + msg_task_t task = MSG_task_create(task_name, 0, 0, NULL); + msg_error_t ret = MSG_task_send(task, ms->mbox_ctl); + // xbt_assert(ret == MSG_OK); + if(ret == MSG_HOST_FAILURE){ + // The DST has crashed, this is a problem has the VM since we are not sure whether SRC is considering that the VM has been correctly migrated on the DST node + // TODO What does it mean ? What should we do ? + MSG_task_destroy(task); + } else if(ret == MSG_TRANSFER_FAILURE){ + // The SRC has crashed, this is not a problem has the VM has been correctly migrated on the DST node + MSG_task_destroy(task); + } + + xbt_free(task_name); + } + + + xbt_free(finalize_task_name); + + XBT_DEBUG("mig: rx_done"); + + return 0; +} + +static void reset_dirty_pages(msg_vm_t vm) +{ + msg_host_priv_t priv = msg_host_resource_priv(vm); + + char *key = NULL; + xbt_dict_cursor_t cursor = NULL; + dirty_page_t dp = NULL; + xbt_dict_foreach(priv->dp_objs, cursor, key, dp) { + double remaining = MSG_task_get_remaining_computation(dp->task); + dp->prev_clock = MSG_get_clock(); + dp->prev_remaining = remaining; + + // XBT_INFO("%s@%s remaining %f", key, sg_host_name(vm), remaining); + } +} + +static void start_dirty_page_tracking(msg_vm_t vm) +{ + msg_host_priv_t priv = msg_host_resource_priv(vm); + priv->dp_enabled = 1; + + reset_dirty_pages(vm); +} + +static void stop_dirty_page_tracking(msg_vm_t vm) +{ + msg_host_priv_t priv = msg_host_resource_priv(vm); + priv->dp_enabled = 0; +} + +#if 0 +/* It might be natural that we define dp_rate for each task. But, we will also + * have to care about how each task behavior affects the memory update behavior + * at the operating system level. It may not be easy to model it with a simple algorithm. */ +double calc_updated_pages(char *key, msg_vm_t vm, dirty_page_t dp, double remaining, double clock) +{ + double computed = dp->prev_remaining - remaining; + double duration = clock - dp->prev_clock; + double updated = dp->task->dp_rate * computed; + + XBT_INFO("%s@%s: computated %f ops (remaining %f -> %f) in %f secs (%f -> %f)", + key, sg_host_name(vm), computed, dp->prev_remaining, remaining, duration, dp->prev_clock, clock); + XBT_INFO("%s@%s: updated %f bytes, %f Mbytes/s", + key, sg_host_name(vm), updated, updated / duration / 1000 / 1000); + + return updated; +} +#endif + +static double get_computed(char *key, msg_vm_t vm, dirty_page_t dp, double remaining, double clock) +{ + double computed = dp->prev_remaining - remaining; + double duration = clock - dp->prev_clock; + + XBT_DEBUG("%s@%s: computed %f ops (remaining %f -> %f) in %f secs (%f -> %f)", + key, sg_host_name(vm), computed, dp->prev_remaining, remaining, duration, dp->prev_clock, clock); + + return computed; +} + +static double lookup_computed_flop_counts(msg_vm_t vm, int stage_for_fancy_debug, int stage2_round_for_fancy_debug) +{ + msg_host_priv_t priv = msg_host_resource_priv(vm); + double total = 0; + + char *key = NULL; + xbt_dict_cursor_t cursor = NULL; + dirty_page_t dp = NULL; + xbt_dict_foreach(priv->dp_objs, cursor, key, dp) { + double remaining = MSG_task_get_remaining_computation(dp->task); + + double clock = MSG_get_clock(); + + // total += calc_updated_pages(key, vm, dp, remaining, clock); + total += get_computed(key, vm, dp, remaining, clock); + + dp->prev_remaining = remaining; + dp->prev_clock = clock; + } + + total += priv->dp_updated_by_deleted_tasks; + + XBT_DEBUG("mig-stage%d.%d: computed %f flop_counts (including %f by deleted tasks)", + stage_for_fancy_debug, + stage2_round_for_fancy_debug, + total, priv->dp_updated_by_deleted_tasks); + + + + priv->dp_updated_by_deleted_tasks = 0; + + + return total; +} + +// TODO Is this code redundant with the information provided by +// msg_process_t MSG_process_create(const char *name, xbt_main_func_t code, void *data, msg_host_t host) +void MSG_host_add_task(msg_host_t host, msg_task_t task) +{ + msg_host_priv_t priv = msg_host_resource_priv(host); + double remaining = MSG_task_get_remaining_computation(task); + char *key = bprintf("%s-%p", task->name, task); + + dirty_page_t dp = xbt_new0(s_dirty_page, 1); + dp->task = task; + + /* It should be okay that we add a task onto a migrating VM. */ + if (priv->dp_enabled) { + dp->prev_clock = MSG_get_clock(); + dp->prev_remaining = remaining; + } + + xbt_assert(xbt_dict_get_or_null(priv->dp_objs, key) == NULL); + xbt_dict_set(priv->dp_objs, key, dp, NULL); + XBT_DEBUG("add %s on %s (remaining %f, dp_enabled %d)", key, sg_host_name(host), remaining, priv->dp_enabled); + + xbt_free(key); +} + +void MSG_host_del_task(msg_host_t host, msg_task_t task) +{ + msg_host_priv_t priv = msg_host_resource_priv(host); + + char *key = bprintf("%s-%p", task->name, task); + + dirty_page_t dp = xbt_dict_get_or_null(priv->dp_objs, key); + xbt_assert(dp->task == task); + + /* If we are in the middle of dirty page tracking, we record how much + * computation has been done until now, and keep the information for the + * lookup_() function that will called soon. */ + if (priv->dp_enabled) { + double remaining = MSG_task_get_remaining_computation(task); + double clock = MSG_get_clock(); + // double updated = calc_updated_pages(key, host, dp, remaining, clock); + double updated = get_computed(key, host, dp, remaining, clock); + + priv->dp_updated_by_deleted_tasks += updated; + } + + xbt_dict_remove(priv->dp_objs, key); + xbt_free(dp); + + XBT_DEBUG("del %s on %s", key, sg_host_name(host)); + + xbt_free(key); +} + + + + +static sg_size_t send_migration_data(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm, + sg_size_t size, char *mbox, int stage, int stage2_round, double mig_speed, double timeout) +{ + sg_size_t sent = 0; + char *task_name = get_mig_task_name(vm, src_pm, dst_pm, stage); + msg_task_t task = MSG_task_create(task_name, 0, size, NULL); + + /* TODO: clean up */ + + double clock_sta = MSG_get_clock(); + + msg_error_t ret; + if (mig_speed > 0) + ret = MSG_task_send_with_timeout_bounded(task, mbox, timeout, mig_speed); + else + ret = MSG_task_send(task, mbox); + + xbt_free(task_name); + + if (ret == MSG_OK) { + sent = size; + } else if (ret == MSG_TIMEOUT) { + sg_size_t remaining = MSG_task_get_remaining_communication(task); + sent = size - remaining; + XBT_INFO("timeout (%lf s) in sending_migration_data, remaining %llu bytes of %llu", + timeout, remaining, size); + } + + /* FIXME: why try-and-catch is used here? */ + if(ret == MSG_HOST_FAILURE){ + //XBT_INFO("SRC host failed during migration of %s (stage %d)", sg_host_name(vm), stage); + MSG_task_destroy(task); + THROWF(host_error, 0, "SRC host failed during migration of %s (stage %d)", sg_host_name(vm), stage); + }else if(ret == MSG_TRANSFER_FAILURE){ + //XBT_INFO("DST host failed during migration of %s (stage %d)", sg_host_name(vm), stage); + MSG_task_destroy(task); + THROWF(host_error, 0, "DST host failed during migration of %s (stage %d)", sg_host_name(vm), stage); + } + + double clock_end = MSG_get_clock(); + double duration = clock_end - clock_sta; + double actual_speed = size / duration; + + if (stage == 2) + XBT_DEBUG("mig-stage%d.%d: sent %llu duration %f actual_speed %f (target %f)", stage, stage2_round, size, duration, actual_speed, mig_speed); + else + XBT_DEBUG("mig-stage%d: sent %llu duration %f actual_speed %f (target %f)", stage, size, duration, actual_speed, mig_speed); + + return sent; +} + +static sg_size_t get_updated_size(double computed, double dp_rate, double dp_cap) +{ + double updated_size = computed * dp_rate; + XBT_DEBUG("updated_size %f dp_rate %f", updated_size, dp_rate); + if (updated_size > dp_cap) { + // XBT_INFO("mig-stage2.%d: %f bytes updated, but cap it with the working set size %f", stage2_round, updated_size, dp_cap); + updated_size = dp_cap; + } + + return (sg_size_t) updated_size; +} + +static double send_stage1(struct migration_session *ms, + sg_size_t ramsize, double mig_speed, double dp_rate, double dp_cap) +{ + + // const long chunksize = (sg_size_t)1024 * 1024 * 100; + const sg_size_t chunksize = (sg_size_t)1024 * 1024 * 100000; + sg_size_t remaining = ramsize; + double computed_total = 0; + + while (remaining > 0) { + sg_size_t datasize = chunksize; + if (remaining < chunksize) + datasize = remaining; + + remaining -= datasize; + send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, datasize, ms->mbox, 1, 0, mig_speed, -1); + double computed = lookup_computed_flop_counts(ms->vm, 1, 0); + computed_total += computed; + } + + return computed_total; } -/** @brief Immediately change the host on which all processes are running. + + +static double get_threshold_value(double bandwidth, double max_downtime) +{ + return max_downtime * bandwidth; +} + +static int migration_tx_fun(int argc, char *argv[]) +{ + XBT_DEBUG("mig: tx_start"); + + // Note that the ms structure has been allocated in do_migration and hence should be freed in the same function ;) + struct migration_session *ms = MSG_process_get_data(MSG_process_self()); + + s_ws_params_t params; + simcall_host_get_params(ms->vm, ¶ms); + const sg_size_t ramsize = params.ramsize; + const sg_size_t devsize = params.devsize; + const int skip_stage1 = params.skip_stage1; + int skip_stage2 = params.skip_stage2; + const double dp_rate = params.dp_rate; + const double dp_cap = params.dp_cap; + const double mig_speed = params.mig_speed; + double max_downtime = params.max_downtime; + + /* hard code it temporally. Fix Me */ +#define MIGRATION_TIMEOUT_DO_NOT_HARDCODE_ME 10000000.0 + double mig_timeout = MIGRATION_TIMEOUT_DO_NOT_HARDCODE_ME; + + double remaining_size = ramsize + devsize; + double threshold; + + /* check parameters */ + if (ramsize == 0) + XBT_WARN("migrate a VM, but ramsize is zero"); + + if (max_downtime == 0) { + XBT_WARN("use the default max_downtime value 30ms"); + max_downtime = 0.03; + } + + /* Stage1: send all memory pages to the destination. */ + XBT_DEBUG("mig-stage1: remaining_size %f", remaining_size); + start_dirty_page_tracking(ms->vm); + + double computed_during_stage1 = 0; + if (!skip_stage1) { + double clock_prev_send = MSG_get_clock(); + + TRY { + /* At stage 1, we do not need timeout. We have to send all the memory + * pages even though the duration of this tranfer exceeds the timeout + * value. */ + sg_size_t sent = send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, ramsize, ms->mbox, 1, 0, mig_speed, -1); + remaining_size -= sent; + computed_during_stage1 = lookup_computed_flop_counts(ms->vm, 1, 0); + + if (sent < ramsize) { + XBT_INFO("mig-stage1: timeout, force moving to stage 3"); + skip_stage2 = 1; + } else if (sent > ramsize) + XBT_CRITICAL("bug"); + + } CATCH_ANONYMOUS { + //hostfailure (if you want to know whether this is the SRC or the DST please check directly in send_migration_data code) + // Stop the dirty page tracking an return (there is no memory space to release) + stop_dirty_page_tracking(ms->vm); + return 0; + } + + double clock_post_send = MSG_get_clock(); + mig_timeout -= (clock_post_send - clock_prev_send); + if (mig_timeout < 0) { + XBT_INFO("The duration of stage 1 exceeds the timeout value (%lf > %lf), skip stage 2", + (clock_post_send - clock_prev_send), MIGRATION_TIMEOUT_DO_NOT_HARDCODE_ME); + skip_stage2 = 1; + } + + /* estimate bandwidth */ + double bandwidth = ramsize / (clock_post_send - clock_prev_send); + threshold = get_threshold_value(bandwidth, max_downtime); + XBT_DEBUG("actual bandwidth %f (MB/s), threshold %f", bandwidth / 1024 / 1024, threshold); + } + + + /* Stage2: send update pages iteratively until the size of remaining states + * becomes smaller than the threshold value. */ + if (skip_stage2) + goto stage3; + + + int stage2_round = 0; + for (;;) { + + sg_size_t updated_size = 0; + if (stage2_round == 0) { + /* just after stage1, nothing has been updated. But, we have to send the + * data updated during stage1 */ + updated_size = get_updated_size(computed_during_stage1, dp_rate, dp_cap); + } else { + double computed = lookup_computed_flop_counts(ms->vm, 2, stage2_round); + updated_size = get_updated_size(computed, dp_rate, dp_cap); + } + + XBT_DEBUG("mig-stage 2:%d updated_size %llu computed_during_stage1 %f dp_rate %f dp_cap %f", + stage2_round, updated_size, computed_during_stage1, dp_rate, dp_cap); + + + /* Check whether the remaining size is below the threshold value. If so, + * move to stage 3. */ + remaining_size += updated_size; + XBT_DEBUG("mig-stage2.%d: remaining_size %f (%s threshold %f)", stage2_round, + remaining_size, (remaining_size < threshold) ? "<" : ">", threshold); + if (remaining_size < threshold) + break; + + + sg_size_t sent; + double clock_prev_send = MSG_get_clock(); + TRY { + sent = send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, updated_size, ms->mbox, 2, stage2_round, mig_speed, mig_timeout); + } CATCH_ANONYMOUS { + //hostfailure (if you want to know whether this is the SRC or the DST please check directly in send_migration_data code) + // Stop the dirty page tracking an return (there is no memory space to release) + stop_dirty_page_tracking(ms->vm); + return 0; + } + double clock_post_send = MSG_get_clock(); + + if (sent == updated_size) { + /* timeout did not happen */ + double bandwidth = updated_size / (clock_post_send - clock_prev_send); + threshold = get_threshold_value(bandwidth, max_downtime); + XBT_DEBUG("actual bandwidth %f, threshold %f", bandwidth / 1024 / 1024, threshold); + remaining_size -= sent; + stage2_round += 1; + mig_timeout -= (clock_post_send - clock_prev_send); + xbt_assert(mig_timeout > 0); + + } else if (sent < updated_size) { + /* When timeout happens, we move to stage 3. The size of memory pages + * updated before timeout must be added to the remaining size. */ + XBT_INFO("mig-stage2.%d: timeout, force moving to stage 3. sent %llu / %llu, eta %lf", + stage2_round, sent, updated_size, (clock_post_send - clock_prev_send)); + remaining_size -= sent; + + double computed = lookup_computed_flop_counts(ms->vm, 2, stage2_round); + updated_size = get_updated_size(computed, dp_rate, dp_cap); + remaining_size += updated_size; + break; + + } else + XBT_CRITICAL("bug"); + } + + +stage3: + /* Stage3: stop the VM and copy the rest of states. */ + XBT_DEBUG("mig-stage3: remaining_size %f", remaining_size); + simcall_vm_suspend(ms->vm); + stop_dirty_page_tracking(ms->vm); + + TRY { + send_migration_data(ms->vm, ms->src_pm, ms->dst_pm, remaining_size, ms->mbox, 3, 0, mig_speed, -1); + } CATCH_ANONYMOUS { + //hostfailure (if you want to know whether this is the SRC or the DST please check directly in send_migration_data code) + // Stop the dirty page tracking an return (there is no memory space to release) + simcall_vm_resume(ms->vm); + return 0; + } + + // At that point the Migration is considered valid for the SRC node but remind that the DST side should relocate effectively the VM on the DST node. + + XBT_DEBUG("mig: tx_done"); + + return 0; +} + + + +static int do_migration(msg_vm_t vm, msg_host_t src_pm, msg_host_t dst_pm) +{ + struct migration_session *ms = xbt_new(struct migration_session, 1); + ms->vm = vm; + ms->src_pm = src_pm; + ms->dst_pm = dst_pm; + ms->mbox_ctl = get_mig_mbox_ctl(vm, src_pm, dst_pm); + ms->mbox = get_mig_mbox_src_dst(vm, src_pm, dst_pm); + + + char *pr_rx_name = get_mig_process_rx_name(vm, src_pm, dst_pm); + char *pr_tx_name = get_mig_process_tx_name(vm, src_pm, dst_pm); + +// MSG_process_create(pr_rx_name, migration_rx_fun, ms, dst_pm); +// MSG_process_create(pr_tx_name, migration_tx_fun, ms, src_pm); +#if 1 + { + char **argv = xbt_new(char *, 2); + argv[0] = pr_rx_name; + argv[1] = NULL; + MSG_process_create_with_arguments(pr_rx_name, migration_rx_fun, ms, dst_pm, 1, argv); + } + { + char **argv = xbt_new(char *, 2); + argv[0] = pr_tx_name; + argv[1] = NULL; + MSG_process_create_with_arguments(pr_tx_name, migration_tx_fun, ms, src_pm, 1, argv); + } +#endif + + /* wait until the migration have finished or on error has occured */ + { + XBT_DEBUG("wait for reception of the final ACK (i.e. migration has been correctly performed"); + msg_task_t task = NULL; + msg_error_t ret = MSG_TIMEOUT; + while (ret == MSG_TIMEOUT && MSG_host_is_on(dst_pm)) //Wait while you receive the message o + ret = MSG_task_receive_with_timeout(&task, ms->mbox_ctl, 10); + + xbt_free(ms->mbox_ctl); + xbt_free(ms->mbox); + xbt_free(ms); + + //xbt_assert(ret == MSG_OK); + if(ret == MSG_HOST_FAILURE){ + // Note that since the communication failed, the owner did not change and the task should be destroyed on the other side. + // Hence, just throw the execption + //XBT_INFO("SRC crashes, throw an exception (m-control)"); + return -1; + } + else if((ret == MSG_TRANSFER_FAILURE) || (ret == MSG_TIMEOUT)){ // MSG_TIMEOUT here means that MSG_host_is_avail() returned false. + //XBT_INFO("DST crashes, throw an exception (m-control)"); + return -2; + } + + + char *expected_task_name = get_mig_task_name(vm, src_pm, dst_pm, 4); + xbt_assert(strcmp(task->name, expected_task_name) == 0); + xbt_free(expected_task_name); + MSG_task_destroy(task); + return 0; + } +} + + + + +/** @brief Migrate the VM to the given host. * @ingroup msg_VMs * - * No migration cost occurs. If you want to simulate this too, you want to use a + * FIXME: No migration cost occurs. If you want to simulate this too, you want to use a * MSG_task_send() before or after, depending on whether you want to do cold or hot * migration. */ -void MSG_vm_migrate(msg_vm_t vm, msg_host_t destination) { - unsigned int cpt; - msg_process_t process; - xbt_dynar_foreach(vm->processes,cpt,process) { - MSG_process_migrate(process,destination); - } - xbt_swag_remove(vm, MSG_host_priv(vm->location)->vms); - xbt_swag_insert_at_tail(vm, MSG_host_priv(destination)->vms); +void MSG_vm_migrate(msg_vm_t vm, msg_host_t new_pm) +{ + /* some thoughts: + * - One approach is ... + * We first create a new VM (i.e., destination VM) on the destination + * physical host. The destination VM will receive the state of the source + * VM over network. We will finally destroy the source VM. + * - This behavior is similar to the way of migration in the real world. + * Even before a migration is completed, we will see a destination VM, + * consuming resources. + * - We have to relocate all processes. The existing process migraion code + * will work for this? + * - The name of the VM is a somewhat unique ID in the code. It is tricky + * for the destination VM? + * + * - Another one is ... + * We update the information of the given VM to place it to the destination + * physical host. + * + * The second one would be easier. + * + */ + + msg_host_t old_pm = simcall_vm_get_pm(vm); + + if (!MSG_vm_is_running(vm)) + THROWF(vm_error, 0, "VM(%s) is not running", sg_host_name(vm)); + + if (MSG_vm_is_migrating(vm)) + THROWF(vm_error, 0, "VM(%s) is already migrating", sg_host_name(vm)); + + msg_host_priv_t priv = msg_host_resource_priv(vm); + priv->is_migrating = 1; + + { - #ifdef HAVE_TRACING - TRACE_msg_vm_change_host(vm,vm->location,destination); - #endif + int ret = do_migration(vm, old_pm, new_pm); + if (ret == -1){ + priv->is_migrating = 0; + THROWF(host_error, 0, "SRC host failed during migration"); + } + else if(ret == -2){ + priv->is_migrating = 0; + THROWF(host_error, 0, "DST host failed during migration"); + } + } - vm->location = destination; + // This part is done in the RX code, to handle the corner case where SRC can crash just at the end of the migration process + // In that case, the VM has been already assigned to the DST node. + //XBT_DEBUG("VM(%s) moved from PM(%s) to PM(%s)", vm->key, old_pm->key, new_pm->key); + //#ifdef HAVE_TRACING + //TRACE_msg_vm_change_host(vm, old_pm, new_pm); + //#endif } + /** @brief Immediately suspend the execution of all processes within the given VM. * @ingroup msg_VMs * - * No suspension cost occurs. If you want to simulate this too, you want to - * use a \ref MSG_file_write() before or after, depending on the exact semantic - * of VM suspend to you. + * This function stops the execution of the VM. All the processes on this VM + * will pause. The state of the VM is preserved. We can later resume it again. + * + * No suspension cost occurs. */ -void MSG_vm_suspend(msg_vm_t vm) { - unsigned int cpt; - msg_process_t process; - xbt_dynar_foreach(vm->processes,cpt,process) { - XBT_DEBUG("suspend process %s of host %s",MSG_process_get_name(process),MSG_host_get_name(MSG_process_get_host(process))); - MSG_process_suspend(process); - } +void MSG_vm_suspend(msg_vm_t vm) +{ + if (MSG_vm_is_migrating(vm)) + THROWF(vm_error, 0, "VM(%s) is migrating", sg_host_name(vm)); + + simcall_vm_suspend(vm); + + XBT_DEBUG("vm_suspend done"); #ifdef HAVE_TRACING TRACE_msg_vm_suspend(vm); #endif } -/** @brief Immediately resumes the execution of all processes within the given VM. + +/** @brief Resume the execution of the VM. All processes on the VM run again. * @ingroup msg_VMs * - * No resume cost occurs. If you want to simulate this too, you want to - * use a \ref MSG_file_read() before or after, depending on the exact semantic - * of VM resume to you. + * No resume cost occurs. */ -void MSG_vm_resume(msg_vm_t vm) { - unsigned int cpt; - msg_process_t process; - xbt_dynar_foreach(vm->processes,cpt,process) { - XBT_DEBUG("resume process %s of host %s",MSG_process_get_name(process),MSG_host_get_name(MSG_process_get_host(process))); - MSG_process_resume(process); - } +void MSG_vm_resume(msg_vm_t vm) +{ + simcall_vm_resume(vm); #ifdef HAVE_TRACING TRACE_msg_vm_resume(vm); #endif } -/** @brief Immediately kills all processes within the given VM. Any memory that they allocated will be leaked. + +/** @brief Immediately save the execution of all processes within the given VM. * @ingroup msg_VMs * - * No extra delay occurs. If you want to simulate this too, you want to - * use a #MSG_process_sleep() or something. I'm not quite sure. + * This function stops the execution of the VM. All the processes on this VM + * will pause. The state of the VM is preserved. We can later resume it again. + * + * FIXME: No suspension cost occurs. If you want to simulate this too, you want to + * use a \ref MSG_file_write() before or after, depending on the exact semantic + * of VM save to you. */ -void MSG_vm_shutdown(msg_vm_t vm) +void MSG_vm_save(msg_vm_t vm) { - msg_process_t process; - XBT_DEBUG("%lu processes in the VM", xbt_dynar_length(vm->processes)); - while (!xbt_dynar_is_empty(vm->processes)) { - process = xbt_dynar_get_as(vm->processes,0,msg_process_t); - MSG_process_kill(process); - } + if (MSG_vm_is_migrating(vm)) + THROWF(vm_error, 0, "VM(%s) is migrating", sg_host_name(vm)); + simcall_vm_save(vm); #ifdef HAVE_TRACING - TRACE_msg_vm_kill(vm); + TRACE_msg_vm_save(vm); #endif - } -/** - * \ingroup msg_VMs - * \brief Reboot the VM, restarting all the processes in it. +/** @brief Restore the execution of the VM. All processes on the VM run again. + * @ingroup msg_VMs + * + * FIXME: No restore cost occurs. If you want to simulate this too, you want to + * use a \ref MSG_file_read() before or after, depending on the exact semantic + * of VM restore to you. */ -void MSG_vm_reboot(msg_vm_t vm) +void MSG_vm_restore(msg_vm_t vm) { - xbt_dynar_t process_list = xbt_dynar_new(sizeof(msg_process_t), NULL); - msg_process_t process; - unsigned int cpt; + simcall_vm_restore(vm); - xbt_dynar_foreach(vm->processes, cpt, process) { - xbt_dynar_push_as(process_list, msg_process_t, process); - } + #ifdef HAVE_TRACING + TRACE_msg_vm_restore(vm); + #endif +} - xbt_dynar_foreach(process_list, cpt, process) { - msg_process_t new_process = MSG_process_restart(process); - MSG_vm_bind(vm, new_process); - } - xbt_dynar_free(&process_list); +/** @brief Get the physical host of a given VM. + * @ingroup msg_VMs + */ +msg_host_t MSG_vm_get_pm(msg_vm_t vm) +{ + return simcall_vm_get_pm(vm); } -/** @brief Destroy a msg_vm_t. + +/** @brief Set a CPU bound for a given VM. * @ingroup msg_VMs + * + * 1. + * Note that in some cases MSG_task_set_bound() may not intuitively work for VMs. + * + * For example, + * On PM0, there are Task1 and VM0. + * On VM0, there is Task2. + * Now we bound 75% to Task1\@PM0 and bound 25% to Task2\@VM0. + * Then, + * Task1\@PM0 gets 50%. + * Task2\@VM0 gets 25%. + * This is NOT 75% for Task1\@PM0 and 25% for Task2\@VM0, respectively. + * + * This is because a VM has the dummy CPU action in the PM layer. Putting a + * task on the VM does not affect the bound of the dummy CPU action. The bound + * of the dummy CPU action is unlimited. + * + * There are some solutions for this problem. One option is to update the bound + * of the dummy CPU action automatically. It should be the sum of all tasks on + * the VM. But, this solution might be costly, because we have to scan all tasks + * on the VM in share_resource() or we have to trap both the start and end of + * task execution. + * + * The current solution is to use MSG_vm_set_bound(), which allows us to + * directly set the bound of the dummy CPU action. + * + * + * 2. + * Note that bound == 0 means no bound (i.e., unlimited). But, if a host has + * multiple CPU cores, the CPU share of a computation task (or a VM) never + * exceeds the capacity of a CPU core. */ -void MSG_vm_destroy(msg_vm_t vm) { - unsigned int cpt; - msg_process_t process; - xbt_dynar_foreach(vm->processes,cpt,process) { - //FIXME: Slow ? - simdata_process_t simdata = simcall_process_get_data(process); - simdata->vm = NULL; - } +void MSG_vm_set_bound(msg_vm_t vm, double bound) +{ + return simcall_vm_set_bound(vm, bound); +} - #ifdef HAVE_TRACING - TRACE_msg_vm_end(vm); - #endif - xbt_free(vm->name); - xbt_dynar_free(&vm->processes); - xbt_free(vm); +/** @brief Set the CPU affinity of a given VM. + * @ingroup msg_VMs + * + * This function changes the CPU affinity of a given VM. Usage is the same as + * MSG_task_set_affinity(). See the MSG_task_set_affinity() for details. + */ +void MSG_vm_set_affinity(msg_vm_t vm, msg_host_t pm, unsigned long mask) +{ + msg_host_priv_t priv = msg_host_resource_priv(vm); + + if (mask == 0) + xbt_dict_remove_ext(priv->affinity_mask_db, (char *) pm, sizeof(pm)); + else + xbt_dict_set_ext(priv->affinity_mask_db, (char *) pm, sizeof(pm), (void *) mask, NULL); + + msg_host_t pm_now = MSG_vm_get_pm(vm); + if (pm_now == pm) { + XBT_DEBUG("set affinity(0x%04lx@%s) for %s", mask, MSG_host_get_name(pm), MSG_host_get_name(vm)); + simcall_vm_set_affinity(vm, pm, mask); + } else + XBT_DEBUG("set affinity(0x%04lx@%s) for %s (not active now)", mask, MSG_host_get_name(pm), MSG_host_get_name(vm)); }