diff options
Diffstat (limited to 'migration/postcopy-ram.c')
| -rw-r--r-- | migration/postcopy-ram.c | 258 |
1 files changed, 1 insertions, 257 deletions
diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c index 7814da5b4b..bec6c2c66b 100644 --- a/migration/postcopy-ram.c +++ b/migration/postcopy-ram.c @@ -61,101 +61,6 @@ struct PostcopyDiscardState { #include <sys/eventfd.h> #include <linux/userfaultfd.h> -typedef struct PostcopyBlocktimeContext { - /* time when page fault initiated per vCPU */ - int64_t *page_fault_vcpu_time; - /* page address per vCPU */ - uintptr_t *vcpu_addr; - int64_t total_blocktime; - /* blocktime per vCPU */ - int64_t *vcpu_blocktime; - /* point in time when last page fault was initiated */ - int64_t last_begin; - /* number of vCPU are suspended */ - int smp_cpus_down; - - /* - * Handler for exit event, necessary for - * releasing whole blocktime_ctx - */ - Notifier exit_notifier; -} PostcopyBlocktimeContext; - -static void destroy_blocktime_context(struct PostcopyBlocktimeContext *ctx) -{ - g_free(ctx->page_fault_vcpu_time); - g_free(ctx->vcpu_addr); - g_free(ctx->vcpu_blocktime); - g_free(ctx); -} - -static void migration_exit_cb(Notifier *n, void *data) -{ - PostcopyBlocktimeContext *ctx = container_of(n, PostcopyBlocktimeContext, - exit_notifier); - destroy_blocktime_context(ctx); -} - -static struct PostcopyBlocktimeContext *blocktime_context_new(void) -{ - PostcopyBlocktimeContext *ctx = g_new0(PostcopyBlocktimeContext, 1); - ctx->page_fault_vcpu_time = g_new0(int64_t, smp_cpus); - ctx->vcpu_addr = g_new0(uintptr_t, smp_cpus); - ctx->vcpu_blocktime = g_new0(int64_t, smp_cpus); - - ctx->exit_notifier.notify = migration_exit_cb; - qemu_add_exit_notifier(&ctx->exit_notifier); - return ctx; -} - -static int64List *get_vcpu_blocktime_list(PostcopyBlocktimeContext *ctx) -{ - int64List *list = NULL, *entry = NULL; - int i; - - for (i = smp_cpus - 1; i >= 0; i--) { - entry = g_new0(int64List, 1); - entry->value = ctx->vcpu_blocktime[i]; - entry->next = list; - list = entry; - } - - return list; -} - -/* - * This function just populates MigrationInfo from postcopy's - * blocktime context. It will not populate MigrationInfo, - * unless postcopy-blocktime capability was set. - * - * @info: pointer to MigrationInfo to populate - */ -void fill_destination_postcopy_migration_info(MigrationInfo *info) -{ - MigrationIncomingState *mis = migration_incoming_get_current(); - PostcopyBlocktimeContext *bc = mis->blocktime_ctx; - - if (!bc) { - return; - } - - info->has_postcopy_blocktime = true; - info->postcopy_blocktime = bc->total_blocktime; - info->has_postcopy_vcpu_blocktime = true; - info->postcopy_vcpu_blocktime = get_vcpu_blocktime_list(bc); -} - -static uint64_t get_postcopy_total_blocktime(void) -{ - MigrationIncomingState *mis = migration_incoming_get_current(); - PostcopyBlocktimeContext *bc = mis->blocktime_ctx; - - if (!bc) { - return 0; - } - - return bc->total_blocktime; -} /** * receive_ufd_features: check userfault fd features, to request only supported @@ -248,19 +153,6 @@ static bool ufd_check_and_apply(int ufd, MigrationIncomingState *mis) } } -#ifdef UFFD_FEATURE_THREAD_ID - if (migrate_postcopy_blocktime() && mis && - UFFD_FEATURE_THREAD_ID & supported_features) { - /* kernel supports that feature */ - /* don't create blocktime_context if it exists */ - if (!mis->blocktime_ctx) { - mis->blocktime_ctx = blocktime_context_new(); - } - - asked_features |= UFFD_FEATURE_THREAD_ID; - } -#endif - /* * request features, even if asked_features is 0, due to * kernel expects UFFD_API before UFFDIO_REGISTER, per @@ -531,9 +423,6 @@ int postcopy_ram_incoming_cleanup(MigrationIncomingState *mis) munmap(mis->postcopy_tmp_zero_page, mis->largest_page_size); mis->postcopy_tmp_zero_page = NULL; } - trace_postcopy_ram_incoming_cleanup_blocktime( - get_postcopy_total_blocktime()); - trace_postcopy_ram_incoming_cleanup_exit(); return 0; } @@ -605,142 +494,6 @@ static int ram_block_enable_notify(const char *block_name, void *host_addr, return 0; } -static int get_mem_fault_cpu_index(uint32_t pid) -{ - CPUState *cpu_iter; - - CPU_FOREACH(cpu_iter) { - if (cpu_iter->thread_id == pid) { - trace_get_mem_fault_cpu_index(cpu_iter->cpu_index, pid); - return cpu_iter->cpu_index; - } - } - trace_get_mem_fault_cpu_index(-1, pid); - return -1; -} - -/* - * This function is being called when pagefault occurs. It - * tracks down vCPU blocking time. - * - * @addr: faulted host virtual address - * @ptid: faulted process thread id - * @rb: ramblock appropriate to addr - */ -static void mark_postcopy_blocktime_begin(uintptr_t addr, uint32_t ptid, - RAMBlock *rb) -{ - int cpu, already_received; - MigrationIncomingState *mis = migration_incoming_get_current(); - PostcopyBlocktimeContext *dc = mis->blocktime_ctx; - int64_t now_ms; - - if (!dc || ptid == 0) { - return; - } - cpu = get_mem_fault_cpu_index(ptid); - if (cpu < 0) { - return; - } - - now_ms = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); - if (dc->vcpu_addr[cpu] == 0) { - atomic_inc(&dc->smp_cpus_down); - } - - atomic_xchg__nocheck(&dc->last_begin, now_ms); - atomic_xchg__nocheck(&dc->page_fault_vcpu_time[cpu], now_ms); - atomic_xchg__nocheck(&dc->vcpu_addr[cpu], addr); - - /* check it here, not at the begining of the function, - * due to, check could accur early than bitmap_set in - * qemu_ufd_copy_ioctl */ - already_received = ramblock_recv_bitmap_test(rb, (void *)addr); - if (already_received) { - atomic_xchg__nocheck(&dc->vcpu_addr[cpu], 0); - atomic_xchg__nocheck(&dc->page_fault_vcpu_time[cpu], 0); - atomic_dec(&dc->smp_cpus_down); - } - trace_mark_postcopy_blocktime_begin(addr, dc, dc->page_fault_vcpu_time[cpu], - cpu, already_received); -} - -/* - * This function just provide calculated blocktime per cpu and trace it. - * Total blocktime is calculated in mark_postcopy_blocktime_end. - * - * - * Assume we have 3 CPU - * - * S1 E1 S1 E1 - * -----***********------------xxx***************------------------------> CPU1 - * - * S2 E2 - * ------------****************xxx---------------------------------------> CPU2 - * - * S3 E3 - * ------------------------****xxx********-------------------------------> CPU3 - * - * We have sequence S1,S2,E1,S3,S1,E2,E3,E1 - * S2,E1 - doesn't match condition due to sequence S1,S2,E1 doesn't include CPU3 - * S3,S1,E2 - sequence includes all CPUs, in this case overlap will be S1,E2 - - * it's a part of total blocktime. - * S1 - here is last_begin - * Legend of the picture is following: - * * - means blocktime per vCPU - * x - means overlapped blocktime (total blocktime) - * - * @addr: host virtual address - */ -static void mark_postcopy_blocktime_end(uintptr_t addr) -{ - MigrationIncomingState *mis = migration_incoming_get_current(); - PostcopyBlocktimeContext *dc = mis->blocktime_ctx; - int i, affected_cpu = 0; - int64_t now_ms; - bool vcpu_total_blocktime = false; - int64_t read_vcpu_time; - - if (!dc) { - return; - } - - now_ms = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); - - /* lookup cpu, to clear it, - * that algorithm looks straighforward, but it's not - * optimal, more optimal algorithm is keeping tree or hash - * where key is address value is a list of */ - for (i = 0; i < smp_cpus; i++) { - uint64_t vcpu_blocktime = 0; - - read_vcpu_time = atomic_fetch_add(&dc->page_fault_vcpu_time[i], 0); - if (atomic_fetch_add(&dc->vcpu_addr[i], 0) != addr || - read_vcpu_time == 0) { - continue; - } - atomic_xchg__nocheck(&dc->vcpu_addr[i], 0); - vcpu_blocktime = now_ms - read_vcpu_time; - affected_cpu += 1; - /* we need to know is that mark_postcopy_end was due to - * faulted page, another possible case it's prefetched - * page and in that case we shouldn't be here */ - if (!vcpu_total_blocktime && - atomic_fetch_add(&dc->smp_cpus_down, 0) == smp_cpus) { - vcpu_total_blocktime = true; - } - /* continue cycle, due to one page could affect several vCPUs */ - dc->vcpu_blocktime[i] += vcpu_blocktime; - } - - atomic_sub(&dc->smp_cpus_down, affected_cpu); - if (vcpu_total_blocktime) { - dc->total_blocktime += now_ms - atomic_fetch_add(&dc->last_begin, 0); - } - trace_mark_postcopy_blocktime_end(addr, dc, dc->total_blocktime, - affected_cpu); -} - /* * Handle faults detected by the USERFAULT markings */ @@ -818,11 +571,8 @@ static void *postcopy_ram_fault_thread(void *opaque) rb_offset &= ~(qemu_ram_pagesize(rb) - 1); trace_postcopy_ram_fault_thread_request(msg.arg.pagefault.address, qemu_ram_get_idstr(rb), - rb_offset, - msg.arg.pagefault.feat.ptid); + rb_offset); - mark_postcopy_blocktime_begin((uintptr_t)(msg.arg.pagefault.address), - msg.arg.pagefault.feat.ptid, rb); /* * Send the request to the source - we want to request one * of our host page sizes (which is >= TPS) @@ -912,8 +662,6 @@ static int qemu_ufd_copy_ioctl(int userfault_fd, void *host_addr, if (!ret) { ramblock_recv_bitmap_set_range(rb, host_addr, pagesize / qemu_target_page_size()); - mark_postcopy_blocktime_end((uintptr_t)host_addr); - } return ret; } @@ -1011,10 +759,6 @@ void *postcopy_get_tmp_page(MigrationIncomingState *mis) #else /* No target OS support, stubs just fail */ -void fill_destination_postcopy_migration_info(MigrationInfo *info) -{ -} - bool postcopy_ram_supported_by_host(MigrationIncomingState *mis) { error_report("%s: No OS support", __func__); |